draft of spec fo WiFi

0224-EX-PL-2001 Text Documents

Intel Corporation

2001-10-04ELS_49062

IEEE Std 802.11b/D8.0, Sept 2001 (Draft Supplement to IEEE Std 802.11 1999 Edition) DRAFT Supplement to STANDARD [for] Information Technology- Telecommunications and information exchange between systems- Local and metropolitan area networks- Specific requirements- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher speed Physical Layer (PHY) extension in the 2.4 GHz band. Sponsor LAN MAN Standards Committee of the IEEE Computer Society Abstract: Changes and additions to IEEE Std. 802.11 to support the higher rate Physical layer for operation in the 2.45 GHz band are provided. Copyright © 2001 by the Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street New York, NY 10017, USA All rights reserved. This is an unapproved draft of a proposed IEEE Standard, subject to change. Permission is hereby granted for IEEE Standards Committee participants to reproduce this document for purposes of IEEE standardization activities. If this document is to be submitted to ISO or IEC, notification shall be given to the IEEE Copyright Administrator. Permission is also granted for member bodies and technical committees of ISO and IEC to reproduce this document for purposes of developing a national position. Other entities seeking permission to reproduce portions of this document for these or other uses must contact the IEEE Standards Department for the appropriate license. Use of information contained in the unapproved draft is at your own risk. IEEE Standards Department Copyright and Permissions 445 Hoes Lane, P.O. Box 1331 Piscataway, NJ 08855-1331, USA

IEEE Wireless LAN Physical (PHY) Layer specifications P802.11b/D8.0, Sept 2001 Keywords: LAN, Local Area Network, Wireless, Radio Frequency Introduction (This introduction is not part of P802.11B/D1.0, Draft Standard for Wireless LAN Physical Layer Standards) This standard is part of a family of standards for Local Area Networks (LANs). This supplement covers an extension to IEEE Std 802.11- 1999 to increase the data rates in the 2.4 GHz band to greater than 10 Mbit/s Participants At the time the draft of this standard was sent to sponsor ballot, the IEEE 802.11 working group had the fol- lowing voting members: Vic Hayes, Chair Stuart J. Kerry, Vice Chair Al Petrick, Co-Vice Chair George Fishel, Secretary Bob O'Hara, Chair and editor 802.11-rev Allen Heberling, State-diagram editor Michael Fischer, State-diagram editor Dean M. Kawaguchi, Chair PHY group David Bagby, Chair MAC group Naftali Chayat, Chair Task Group a Hitoshi Takanashi, Editor 802.11a John Fakatselis , Chair Task Group b Carl F. Andren, Editor 802.11b Copyright © 2001 IEEE. All rights reserved . This is an unapproved IEEE Standards Draft, subject to change 1

IEEE P802.11b/D8.0, Sept 2001 Draft Suppliment to Standard for Voting Members: Jeff Abramowitz Maarten Hoeben Roy Sebring Reza Ahy Masayuki Ikeda Tie-Jun Shan Keith B. Amundsen Donald C. Johnson Stephen J. Shellhammer James R. Baker Tal Kaitz Matthew B. Shoemake Kevin M. Barry Ad Kamerman Thomas Siep Phil Belanger Mika Kasslin Donald I. Sloan John Biddick Patrick Kinney Gary Spiess Simon Black Steven Knudsen Satoru Toguchi Timothy J. Blaney Bruce P. Kraemer Cherry Tom Jan Boer David S. Landeta Mike Trompower Ronald Brockmann James S. Li Tom Tsoulogiannis Wesley Brodsky Stanley Ling Bruce Tuch John H. Cafarella Michael D. McInnis Sarosh Vesuna Wen-Chiang Chen Gene Miller Ikuo Wakayama Ken Clements Akira Miura Robert M. Ward Jr. Wim Diepstraten Henri Moelard Mark Webster Peter Ecclesine Masaharu Mori Leo Wilz Richard Eckard Masahiro Morikura Harry Worstell Darwin Engwer Richard van Nee Lawrence W. Yonge III Greg Ennis Erwin R. Noble Chris Zegelin Jeff Fischer Tomoki Ohsawa Johnny Zweig John Fisher Kazuhiro Okanoue Jim Zyren Ian Gifford Richard H. Paine Motohiro Gochi Roger Pandanda Tim Godfrey Victoria M. Poncini Steven D. Gray Gregory S. Rawlins Jan Haagh Stanley A. Reible Karl Hannestad Frits Riep Kei Hara William Roberts Chris Heegard Kent G. Rollins Robert Heile Clemens C.W. Ruppel Juha Heiskala Anil K. Sanwalka The following persons were on the balloting committee: This section is usually supplied by IEEE Balloting Center staff. Copyright © 2001 IEEE. All rights reserv ed . 2 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table of Contents 1 2 3.8 Basic Service Set (BSS) basic rate set: 4 3 4.0 Abbreviations and acronyms 4 4 7.2.3.1 Beacon frame format 4 5 7.2.3.9 Probe Request frame format 5 6 7.3.1.4 Capability Information Field 6 7 7.3.1.9 Status Code Field 7 8 7.3.2.2 Supported Rates element 7 9 9.2 DCF 7 10 9.6 Multirate support 7 11 10.3.3.1.2 Semantics of the service primitive 9 12 10.3.10.1.2 Semantics of the service primitive 9 13 18 High rate direct sequence spread spectrum (HR/DSSS) PHY specification 12 14 18.1Overview 12 15 Scope 12 16 High Rate PHY functions 13 17 Service specification method and notation 13 18 18 .2High Rate PLCP sublayer 13 19 Overview 13 20 PPDU format 14 21 PLCP PPDU field definitions 15 22 PLCP/High Rate PHY data scrambler and descrambler 21 23 PLCP transmit procedure 22 24 PLCP receive procedure 23 25 18.3High Rate physical layer management entity (PLME) 27 26 PLME_SAP sublayer management primitives 27 27 High Rate PHY MIB 28 28 DS PHY characteristics 29 29 High Rate TXTIME calculation 30 30 Vector Descriptions 30 31 18.4High Rate PMD sublayer 31 32 Scope and field of application 31 33 Overview of service 31 34 Overview of interactions 31 35 Basic service and options 32 36 PMD_SAP detailed service specification 32 37 PMD operating specifications, general 43 38 PMD transmit specifications 54 39 PMD receiver specifications 59 40 Annex A Protocol Implementation Conformance Statement (PICS) Proforma (normative) 60 41 A.4.3 - IUT Configuration 60 42 A 4.9 - High Rate Direct Sequence Physical Layer Functions 61 43 Annex C: Formal Description of MAC Operation (Normative) 64 44 Annex D ASN.1 Encoding of the MAC and PHY Management Information Base (normative) 88 45 Annex F - High Rate PHY / frequency hopping interoperability (Informative) 89 46 F.1 Additional CCA Requirements 89 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 3 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 DRAFT Supplement to STANDARD [for] 1 2 Information Technology- 3 4 Telecommunications and information exchange 5 between systems- 6 7 Local and metropolitan area networks- 8 Specific requirements- 9 10 11 Part 11: Wireless LAN Medium Access Control 12 (MAC) and Physical Layer (PHY) specifications: 13 14 Higher speed Physical Layer (PHY) extension in 15 the 2.4 GHz band. 16 17 [This supplement is based on the current edition of IEEE Std 802.11, 1999 Edition. 18 19 NOTE—The editing instructions contained in this supplement define how to merge the material contained 20 herein into the existing base standard to form the new comprehensive standard as created by the addition of 21 IEEE Std 802.11b-1999. 22 23 The editing instructions are shown in bold italic. Three editing instructions are used: change, delete, and in- 24 sert. Change is used to make small corrections in existing text or tables. The editing instruction specifies the 25 location of the change and describes what is being changed either by using strikethrough (to remove old ma- 26 terial) or underscore (to add new material). Delete removes existing material. Insert adds new material with- 27 out disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are 28 given in the editing instruction. Editorial notes will not be carried over into future editions. 29 30 Change the following paragraphs as indicated: 31 32 3.8 Basic Service Set (BSS) basic rate set: 33 34 The set of data transfer rates that all the stations in a BSS will be capable of using to receive and transmit 35 frames to/from the wireless medium (WM). The BSS basic rate set data rates are preset for all stations in the 36 BSS. 37 38 4.0 Abbreviations and acronyms 39 Insert the following abbreviations alphabetically in the list in 4.0: 40 41 CCK Complementary Code Keying 42 High Rate High Rate Direct Sequence Spread Spectrum with or without Options enabled 43 HR/DSSS High Rate Direct Sequence Spread Spectrum using the long preamble and header 44 HR/DSSS/short High Rate Direct Sequence Spread Spectrum using the optional short preamble and header 45 mode 46 HR/DSSS/PBCC High Rate Direct Sequence Spread Spectrum using the optional Packet Binary Convolu- 47 tional Coding mode and the long preamble and header 48 HR/DSSS/PBCC/short High Rate Direct Sequence Spread Spectrum using the optional Packet Binary Con- 49 volutional Coding mode and the optional short preamble and header 50 51 7.2.3.1 Beacon frame format 52 53 Change notes 1 and 2 of this table as shown. 54 55 Copyright © 2001 IEEE. All rights reserved . 4 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table 5 Beacon frame body 1 Order Information Note 2 1 Timestamp 3 2 Beacon interval 4 3 Capability information 5 4 SSID 6 5 Supported rates 7 6 FH Parameter Set 1 8 7 DS Parameter Set 2 9 8 CF Parameter Set 3 10 9 IBSS Parameter Set 4 10 TIM 5 11 Notes: 12 1—The FH Parameter Set information element is only present within Beacon frames 13 generated by STAs using frequency-hopping PHYs. 14 2—The DS Parameter Set information element is only present within Beacon frames 15 generated by STAs using direct sequence PHYs. 16 3—The CF Parameter Set information element is only present within Beacon frames 17 generated by APs supporting a PCF. 18 4—The IBSS Parameter Set information element is only present within Beacon 19 frames generated by STAs in an IBSS. 20 5—The TIM information element is only present within Beacon frames generated by 21 APs. 22 23 24 25 26 7.2.3.9 Probe Request frame format 27 28 Change notes 1 and 2 of this table as shown. 29 30 Table 12—Probe Response frame body 31 32 Order Information Note 33 1 Timestamp 34 2 Beacon interval 35 3 Capability information 36 4 SSID 37 5 Supported rates 38 6 FH Parameter Set 1 39 7 DS Parameter Set 2 8 CF Parameter Set 3 40 9 IBSS Parameter Set 4 41 NOTES 42 1—The FH Parameter Set information element is only present within 43 Probe Response frames generated by STAs using frequency-hopping 44 PHYs. 45 2—The DS Parameter Set information element is only present within 46 Probe Response frames generated by STAs using direct sequence PHYs. 47 3—The CF Parameter Set information element is only present within 48 Probe Response frames generated by APs supporting a PCF. 49 4—The IBSS Parameter Set information element is only present within 50 Probe Response frames generated by STAs in an IBSS. 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 5 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 7.3.1.4 Capability Information Field 3 4 Insert three subfields to the capability information field figure and supporting text as shown: 5 6 The Capability Information Field contains a number of subfields that are used to indicate requested or adver- 7 tised capabilities. 8 9 The length of the Capability Information Field is two octets. The Capability Information Field consists of 10 the following subfields: ESS, IBSS, CF-Pollable, CF-Poll Request, and Privacy, Short Preamble, PBCC, and 11 Channel Agility. The format of the Capability Information Field is as illustrated in Figure 27. 12 13 14 15 B0 B1 B2 B3 B4 B5 B6 B7 B8 B15 16 CF CF Poll Short Channel Pollable Request Reserved 17 ESS IBSS Privacy Preamble PBCC Agility 18 19 Octets: 20 2 21 22 Figure 27 -- Capability Information Fixed Field 23 24 . 25 26 Insert the following text after the text in 7.3.1.4. 27 28 APs (as well as STAs in IBSSs) shall set the Short Preamble subfield to 1 in transmitted Beacon, Probe 29 Response, Association Response and Reassociation Response management MMPDUs to indicate that the 30 use of the short preamble option, as described in subclause 18.2.2.2 is allowed within this BSS. To indicate 31 that the use of the short preamble option is not allowed the Short Preamble subfield shall be set to 0 in Bea- 32 con, Probe Response, Association Response and Reassociation Response management MMPDUs transmit- 33 ted within the BSS. 34 35 36 37 STAs shall set the Short Preamble subfield to 1 in transmitted Association Request and Reassociation 38 Request MMPDUs when the MIB attribute dot11ShortPreambleOptionImplemented is true. Otherwise 39 STAs shall set the Short Preamble subfield to 0 in transmitted Association Request and Reassociation 40 Request MMPDUs. 41 42 43 44 APs (as well as STAs in IBSSs) shall set the PBCC subfield to 1 in transmitted Beacon, Probe Response, 45 Association Response and Reassociation Response management MMPDUs to indicate that the use of the 46 PBCC modulation option, as described in subclause 18.4.6.6 is allowed within this BSS. To indicate that the 47 use of the PBCC modulation option is not allowed the PBCC subfield shall be set to 0 in Beacon, Probe 48 Response, Association Response and Reassociation Response management MMPDUs transmitted within 49 the BSS. 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 6 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 STAs shall set the PBCC subfield to 1 in transmitted Association Request and Reassociation Request MMP- 1 DUs when the MIB attribute dot11PBCCOptionImplemented is true. Otherwise STAs shall set the PBCC 2 subfield to 0 in transmitted Association Request and Reassociation Request MMPDUs. 3 4 5 6 Bit 7 of the Capabilities Information Field shall be used to indicate the usage of channel agility by the HR/ 7 DSSS PHY. STAs shall set the Channel Agility bit to 1 when channel agility is in use and shall set it to 0 8 otherwise. 9 10 Bits 8 to 15 of the Capability Information Field are reserved. 11 12 13 7.3.1.9 Status Code Field 14 15 Add three status codes as shown to table 19: 16 Table 19 --- Status Codes 17 Status code Meaning 18 19 Association denied due to requesting station not supporting the short 19 preamble option. 20 20 Association denied due to requesting station not supporting the PBCC 21 modulation option. 22 21 Association denied due to requesting station not supporting the channel 23 agility option. 24 25 26 27 7.3.2.2 Supported Rates element 28 29 Change the paragraph as follows: 30 31 The Supported Rates element specifies all the values rates that this station is capable of receiving in the 32 Operational Rate Set parameter as described in the MLME_Join.request and MLME_Start.request primi- 33 tives. The information field is encoded as 1 to 8 octets where each octet describes a single supported rate in 34 units of 500 kbit/s. 35 36 Within Beacon, Probe Response, Association Response, and Reassociation Response management frames, 37 each supported rate belonging to the BSSBasicRateSet BSS basic rate set, is encoded as an octet with the 38 msb (bit 7) set to 1 (e.g., a 1 Mbit/s rate belonging to the BSSBasicRateSet BSS basic rate set is encoded as 39 X'82'). Rates not belonging to the BSSBasicRateSet BSS basic rate set are encoded with the msb set to 0 40 (e.g., a 2 Mbit/s rate not belonging to the BSSBasicRateSet BSS basic rate set is encoded as X'04'). The msb 41 of each Supported Rate octet in other management frame types is ignored by receiving STAs. 42 43 BSSBasicRateSet The BSS basic rate set information in Beacon and Probe Response management frames is 44 delivered to the management entity in an STA via the BSSBasicRateSet parameter in the MLME_Scan.con- 45 firm primitive. It is used by the management entity in an STA s in order to avoid associating with a BSS if 46 the STA cannot receive and transmit all the data rates in the BSSBasicRateSet BSS basic rate set. See Figure 47 36. 48 49 9.2 DCF 50 51 Change the second to the last paragraph as shown: 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 7 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 The medium access protocol allows for stations to support different sets of data rates. All STAs shall be able 1 to receive and transmit at all the data rates in the aBasicRateSet specified parameter of the 2 MLME_Join.request and MLME_Start.request primitives and transmit at one or more of the aBasicRateSet 3 data rates. To support the proper operation of the RTS/CTS and the Virtual Carrier Sense mechanism, all 4 STAs shall be able to detect the RTS and CTS frames. For this reason the RTS and CTS frames shall be 5 transmitted at one of the rates in the BSS basic rate set aBasicRateSet rates. (See subclause 9.6 for a descrip- 6 tion of multirate operation). 7 8 9 9.6 Multirate support 10 11 12 Change the existing subclause as follows: 13 14 Some PHYs have multiple data transfer rate capabilities that allow implementations to perform dynamic rate 15 switching with the objective of improving performance. The algorithm for performing rate switching is 16 beyond the scope of this standard, but in order to ensure coexistence and interoperability on multirate-capa- 17 ble PHYs, this standard defines a set of rules that shall be followed by all STAs. 18 19 All Control frames shall be transmitted at one of the rates in the BSSBasicRateSet BSS basic rate set (see 20 10.3.10.1), or at one of the rates in the PHY mandatory rate set so that they will be understood by all STAs 21 in the BSS. 22 23 All frames with multicast and broadcast RA shall be transmitted at one of the rates included in the BSSBasi- 24 cRateSet BSS basic rate set, regardless of their type or subtype. 25 26 Data and/or management MPDUs with a unicast immediate address RA shall be sent on any supported data 27 rate selected by the rate switching mechanism (whose output is an internal MAC variable called MACCur- 28 rentRate, defined in units of 500 kbit/s, which is used for calculating the Duration/ID field of each frame). A 29 STA shall not transmit at a rate that is known not to be supported by the destination STA, as reported in the 30 supported rates element in the management frames. For frames of type Data+CF-ACK, Data+CF-Poll+CF- 31 ACK and CF-Poll+CF-ACK, the rate chosen to transmit the frame must be supported by both the addressed 32 recipient STA and the STA to which the ACK is intended. 33 34 In order to To allow the transmitting STA to calculate the contents of the Duration/ID field, the responding 35 STA shall transmit its Control Response and Management Response frames (either CTS or ACK) at the 36 highest rate in the BSS basic rate set that is less than or equal to the rate of at the same rate as the immedi- 37 ately previous frame in the frame exchange sequence (as defined in 9.7), if this rate belongs to the PHY 38 mandatory rates, or else at the highest possible rate belonging to the PHY rates in the BSSBasicRateSet. In 39 addition the Control Response frame shall be sent using the same PHY options as the received frame. 40 41 For the HR/DSSS PHY, the time required to transmit a frame, for use in the Duration/ID field, is determined 42 using the PLME-TXTIME.request primitive and the PLME-TXTIME.confirm primitive, both defined in 43 18.3.4. 44 45 10.3.1PLME_start 46 47 Change "set" to "sets" in the Name and Description columns for the PHY Parameter Set. 48 49 10.3.2.2 PLME_scan.confirm 50 51 Change "set" to "sets" in the Name and Description columns for the PHY Parameter Set. 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 8 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 10.3.2.2.2. Semantics of the service primitive 1 2 Change wording in the table in the BSSBasicRateSet Description to: 3 4 The set of data rates that must be supported by all STAs that desire to join this BSS. The STAs must be able 5 to receive and transmit at each of the data rates listed in the set. 6 7 10.3.3.1.2 Semantics of the service primitive 8 9 Change Table as follows: 10 11 Name Type Valid Range Description 12 BSSDescription BSSDescription N/A The BSSDescription of the BSS to join. The 13 BSSDescription is a member of the set of 14 descriptions that was returned as a result of a 15 MLME-SCAN.request. 16 JoinFailureTimeout integer greater than or The time limit, in units of beacon intervals, 17 equal to 1 after which the join procedure will be termi- 18 nated 19 ProbeDelay integer N/A Delay (in µs) to be used prior to transmitting a 20 Probe frame during active scanning 21 OperationalRateSet set of integers 1 through 127 The set of data rates (in units of 500kbit/s) that 22 inclusive (for the STA desires to use for communication 23 24 each integer in within the BSS. The STA must be able to 25 the set) receive at each of the data rates listed in the 26 set. The OperationalRateSet This set is a 27 superset of the BSSBasicRateSet BSS basic 28 rate set advertised by the BSS. 29 30 10.3.10.1.2 Semantics of the service primitive 31 32 Change the table as follows: 33 34 Name Type Valid Range Description 35 SSID octet string 1 - 32 octets The SSID of the BSS. 36 BSSType Enumeration INFRA- The type of the BSS. 37 STRUCTURE, 38 INDEPEN- 39 DENT 40 Beacon Period integer greater than or The Beacon period of the BSS (in TU). 41 equal to 1 42 DTIM Period integer As defined in The DTIM Period of the BSS (in Beacon 43 7.3.12.6 Periods) 44 CF parameter set As defined in As defined in The parameter set for CF periods, if the BSS 45 Frame Format 7.3.2.5 supports CF mode. aCFPPeriod is modified 46 as a side effect of the issuance of a MLME- 47 START.request primitive. 48 PHY parameter set As defined in As defined in The parameter set relevant to the PHY. 49 Frame Format 7.3.2.3 or 50 51 7.3.2.4 IBSS parameter set As defined in As defined in The parameter set for the IBSS, if BSS is an 52 53 Frame Format 7.3.2.7 IBSS. 54 55 Copyright © 2001 IEEE. All rights reserved . 9 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 ProbeDelay integer N/A Delay (in µs) to be used prior to transmitting 1 a Probe frame during active scanning 2 CapabilityInformation As defined in As defined in The capabilities to be advertised for the BSS. 3 Frame Format 7.3.1.4 4 BSSBasicRateSet set of integers 1 through 127 The set of data rates (in units of 500 kbit/s) 5 inclusive (for that must be supported by all STAs that desire 6 7 each integer in to join this BSS. The STA that is creating the 8 the set) BSS must be able to receive and transmit at 9 each of the data rates listed in the set. 10 OperationalRateSet set of integers 1 through 127 The set of data rates (in units of 500 kbit/s) 11 inclusive (for that the STA desires to use for communica- 12 each integer in tion within the BSS. The STA must be able to 13 the set) receive at each of the data rates listed in the 14 set. The OperationalRateSet This set is a 15 superset of the BSS basic rate set BSSBasi- 16 cRateSet advertised by the BSS. 17 18 10.4.4 PLME_DSSSTESTMODE 19 Add switches for the new options. 20 21 PLME-DSSSTESTMODE.request ( 22 TEST_ENABLE, 23 TEST_MODE, 24 SCRAMBLE_STATE, 25 SPREADING_STATE, 26 27 DATA_TYPE, 28 DATA_RATE; 29 PREAMBLE_TYPE; 30 MODULATION_CODE_TYPE; 31 ) 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 10 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 Valid 4 Name Type Description Range 5 TEST_ENABLE Boolean True, false If true, enables the PHY test mode according to the 6 remaining parameters 7 TEST_MODE Integer 1, 2, 3 TEST_MODE selects one of three operational 8 modes 9 01 = transparent receive 10 02 = continuous transmit 11 03 = 50% duty cycle 12 SCRAMBLE_STATE Boolean True, false If true, sets the operational state of the scrambler to 13 ON 14 SPREADING_STATE Boolean True, false If true, selects the operational state of the chipping 15 16 DATA_TYPE Integer 1, 2, 3 Selects one of three data patterns to be used for the 17 transmit portions of the tests. For example: 18 all one, all zeros, and random data patterns 19 DATA_RATE Integer 2, 4, 11, 22 Selects between 1 and 2 Mbit/s operation 20 02 = 1 Mbit/s 21 04 = 2 Mbit/s 22 11 = 5.5 Mbit/s 22 = 11 Mbit/s 23 24 PREAMBLE_TYPE Boolean null, 0,1 Selects the preamble length. Can be null 25 26 MODULATION_CODE_TYP Boolean null, 0, 1 Selects the modulation code E 0 = CCK 27 1 = PBCC 28 Can be null 29 30 31 32 33 Add a paragraph 18 as follows: 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 11 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18 High rate direct sequence spread spectrum (HR/DSSS) PHY specification 1 2 3 18.1 Overview 4 5 This clause specifies the high rate extension of the physical layer for the Direct Sequence Spread Spectrum 6 (DSSS) system (clause 15 in IEEE Std 802.11- 1999) hereinafter known as the High Rate PHY for the 7 2.4GHz band designated for ISM applications. The Radio Frequency LAN system is aimed at the 2.4 GHz 8 bands designated for ISM applications as provided in the USA according to Code of Federal Regulations, 9 Title 47, Section 15.247, in Europe by ETS 300-328 and other countries according to subclause 18.4.6.2. 10 11 This extension of the DSSS system builds on the data rate capabilities as described in clause 15 in IEEE Std 12 802.11- 1999 to provide 5.5 and 11 Mbit/s payload data rates in addition to the 1 and 2 Mbps rates. To pro- 13 vide the higher rates, 8 chip Complementary Code Keying (CCK) is employed as the modulation scheme. 14 The chipping rate is 11 MHz, which is the same as the DSSS system as described in IEEE Std 802.11- 1999 15 clause 15, thus providing the same occupied channel bandwidth. The basic new capability described in this 16 clause is called High Rate Direct Sequence Spread Spectrum (HR/DSSS). The basic High Rate PHY uses 17 the same PLCP preamble and header as the DSSS PHY so both PHYs can co-exist in the same BSS and can 18 use the rate switching mechanism as provided. 19 20 In addition to providing higher speed extensions to the DSSS system, a number of optional features are 21 described that will allow the performance of the Radio Frequency LAN system to be improved as technol- 22 ogy allows the implementation of these options to become cost effective. 23 24 An optional mode replacing the CCK modulation with Packet Binary Convolutional Coding (HR/DSSS/ 25 PBCC) is provided. 26 27 28 Another optional mode which allows data throughput at the higher rates (2, 5.5 and 11 Mbit/s) to be signifi- 29 cantly, increased by using a shorter PLCP preamble, is also provided. This mode is called HR/DSSS/short or 30 HR/DSSS/PBCC/short. This short preamble mode can co-exist with DSSS, HR/DSSS, or HR/DSSS/PBCC 31 under limited circumstances such as on different channels or with appropriate CCA mechanisms. 32 33 An optional capability for channel agility is also provided for. This option allows an implementation to over- 34 come some inherent difficulty with static channel assignements (a tone jammer), without burdening all 35 implementations with the added cost of this capability. This option can also be used to implement 802.11 36 compliant systems that are interoperable with both FH and DS modulations. See informative Annex F for 37 more details. 38 39 18.1.1 Scope 40 41 This clause specifies the Physical Layer Entity for the Higher Rate Direct Sequence Spread Spectrum 42 (DSSS) extension and the changes that have to be made to the base standard to accommodate the High Rate 43 PHY. 44 45 The High Rate PHY layer consists of two protocol functions: 46 47 a) A physical layer convergence function, which adapts the capabilities of the physical medium depen- 48 dent (PMD) system to the PHY service. This function is supported by the physical layer conver- 49 gence procedure (PLCP), which defines a method of mapping the MAC sublayer protocol data 50 units (MPDU) into a framing format suitable for sending and receiving user data and management 51 information between two or more STAs using the associated PMD system. The PHY exchanges 52 PHY Protocol Data Units (PPDU) that contain PLCP Service Data Units (PSDU). The MAC uses 53 the PHY service, so each MPDU corresponds to a PSDU that is carried in a PPDU. 54 55 Copyright © 2001 IEEE. All rights reserved . 12 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 b) A PMD system, whose function defines the characteristics of, and method of transmitting and 1 receiving data through, a wireless medium between two or more STAs each using the High Rate sys- 2 tem. 3 4 18.1.2 High Rate P HY functions 5 6 The 2.4 GHz High Rate PHY architecture is depicted in the ISO/IEC basic reference model shown in Figure 7 11. The High Rate PHY contains three functional entities: the PMD function, the physical layer convergence 8 function, and the layer management function. Each of these functions is described in detail in the following 9 subclauses. For the purposes of MAC and MAC Management when channel agility is both present and 10 enabled (see 18.3.2 and Annex C), the High Rate PHY shall be interpreted to be both a High Rate and a fre- 11 quency hopping physical layer. 12 13 The High Rate PHY service shall be provided to the MAC through the PHY service primitives described in 14 Clause 12 of IEEE Std 802.11- 1999. 15 16 18.1.2.1 PLCP sublayer 17 18 To allow the MAC to operate with minimum dependence on the PMD sublayer, a physical layer conver- 19 gence procedure (PLCP) sublayer is defined. This function simplifies the PHY service interface to the 20 MAC services. 21 22 18.1.2.2 Physical Medium Dependent Sublayer (PMD) sublayer 23 24 The PMD sublayer provides a means and method of transmitting and receiving data through a wireless 25 medium (WM) between two or more STAs each using the High Rate system. 26 27 18.1.2.3 Physical layer management entity (PLME) 28 29 The PLME performs management of the local PHY functions in conjunction with the MAC management 30 entity. 31 32 18.1.3 Service specification method and notation 33 34 35 The models represented by figures and state diagrams are intended to be illustrations of functions provided. 36 It is important to distinguish between a model and a real implementation. The models are optimized for sim- 37 plicity and clarity of presentation; the actual method of implementation is left to the discretion of the High 38 Rate PHY compliant developer. 39 40 The service of a layer or sublayer is a set of capabilities that it offers to a user in the next-higher layer (or 41 sublayer). Abstract services are specified here by describing the service primitives and parameters that char- 42 acterize each service. This definition is independent of any particular implementation. 43 44 18.2 High Rate PLCP sublayer 45 46 18.2.1 Overview 47 48 This subclause provides a convergence procedure for the 2, 5.5 and 11 Mbit/s specification in which PSDUs 49 are converted to and from PPDUs. During transmission, the PSDU shall be appended to a PLCP preamble 50 and header to create the PPDU. Two different preambles and headers are defined: the mandatory supported 51 long preamble and header which interoperates with the current 1 and 2 Mbit/s DSSS specification as 52 described in IEEE Std 802.11- 1999, and an optional short preamble and header. At the receiver, the PLCP 53 preamble and header are processed to aid in demodulation and delivery of the PSDU. 54 55 Copyright © 2001 IEEE. All rights reserved . 13 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: The optional short preamble and header is intended for applications where maximum throughput is desired 1 and interoperability with legacy and non short preamble capable equipment is not a consideration. That is, it 2 is expected to be used only in networks of like equipment that can all handle the optional mode. 3 4 18.2.2 PPDU format 5 6 Two different preambles and headers are defined: the mandatory supported long preamble and header which 7 is interoperable with the current 1 and 2 Mbit/s DSSS specification as described in IEEE Std 802.11- 1999, 8 and an optional short preamble and header. 9 10 18.2.2.1 Long PLCP PPDU format 11 12 Figure 1 shows the format for the interoperable (long) PPDU including the High Rate PLCP Preamble, the 13 High Rate PLCP Header, and the PSDU. The PLCP Preamble contains the following fields: Synchronization 14 (Sync) and Start Frame Delimiter (SFD). The PLCP Header contains the following fields: Signaling (SIG- 15 NAL), Service (SERVICE), Length (L ENGTH), and CCITT CRC-16 field. Each of these fields is 16 described in detail in 18.2.3. The format for the PPDU including the long High Rate PLCP preamble, the 17 long High Rate PLCP header and the PSDU do not differ from the IEEE Std 802.11- 1999 for 1 and 2 Mbit/ 18 s. The only exceptions are the encoding of the rate in the SIGNAL Field and the use of bits in the SERVICE 19 field to resolve an ambiguity in PSDU length in octets when the length is expressed in whole microseconds 20 and to indicate if the optional PBCC mode is being used 21 22 . 23 SCRAMBLED ONES 24 25 26 SYNC SFD SIGNAL SERVICE LENGTH CRC 1 Mbit/s D BPSK 128 BITS 16 BITS 8 BITS 8 BITS 16 BITS 16 BITS BARKER 27 28 29 30 31 PLCP PREAMBLE PLCP HEADER 144 BITS 48 BITS PSDU 32 33 192µs 34 1 DBPSK BARKER 35 PPDU 2 DQPSK BARKER 5.5 OR 11 M bit/s 36 37 Figure 1—Long PLCP PPDU format 38 39 18.2.2.2 Short PLCP PPDU format (Optional) 40 41 The short PLCP preamble and header (HR/DSSS/short) is defined as optional. The short preamble and 42 header may be used to minimize overhead and thus maximize the network data throughput. The format of 43 the PPDU with HR/DSSS/short is depicted in Figure 2. 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 14 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 SCRAMBLED ZEROS BACKWARD SFD 3 4 short SYNC shortSFD 5 56 BITS 16 BITS 6 DBPSK BARKER 7 SIGNAL SERVICE LENGTH CRC 8 8 BITS 8 BITS 16 BITS 16 BITS 9 2 Mbit/s 10 11 12 SHORT PLCP PREAMBLE SHORT P LCP HEADER PSDU 13 72 BITS @ 1 Mbit/s 48 BITS @ 2 Mbit/s VARIABLE @ 2, 5.5, OR 11Mbit/s 14 96µ s 15 16 PPDU 17 18 19 Figure 2—Short PLCP PPDU format 20 21 22 A transmitter using the short PLCP will only be interoperable with another receiver which is also capable of 23 receiving this short PLCP. To interopera te with a receiver that is not capable of receiving a short preamble 24 and header, the transmitter shall use the long PLCP preamble and header. The short PLCP preamble uses the 25 1 Mbit/s Barker code spreading with DBPSK modulation. The short PLCP header uses the 2 Mbit/s Barker 26 code spreading with DQPSK modulation and the PSDU is transmitted at 2Mbit/s, 5.5 Mbit/s or 11 Mbit/s . 27 28 Stations not implementing this option that do active scanning will get a response even when the network is 29 using short preambles since all management traffic is returned with the same type preamble as received. 30 31 18.2.3 PLCP PPDU field definitions 32 33 34 In the following PLCP field definition subclauses, the definitions for the Long (i.e. clause 15) PLCP fields 35 are described first. Subsequently, the definitions of the short PLCP are defined. The names for the short 36 PLCP fields are preceded with the term Short. 37 38 18.2.3.1 Long PLCP Synchronization Field (SYNC) 39 40 The SYNC field shall consist of 128 bits of scrambled "1" bits. This field is provided so the receiver can per- 41 form the necessary synchronization operations. The initial state of the scrambler (seed) shall be [1101100], 42 where the left most bit specifies the value to put in the first delay element (Z1 ) in Figure 5 and the right most 43 bit specifies the value to put in the last delay element in the scrambler. 44 45 46 To support the reception of DSSS signals generated with implementations based on clause 15, the receiver 47 shall also be capable of synchronization on a SYNC field derived from any non-zero scrambler initial state. 48 49 18.2.3.2 Long PLCP Start Frame Delimiter (SFD) 50 51 The SFD shall be provided to indicate the start of PHY dependent parameters within the PLCP Preamble. 52 The SFD shall be a 16-bit field, [1111 0011 1010 0000], where the right most bit shall be transmitted first in 53 time. 54 55 Copyright © 2001 IEEE. All rights reserved . 15 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.2.3.3 Long PLCP Signal (SIGNAL) field 1 2 The 8-bit signal field indicates to the PHY the modulation that shall be used for transmission (and recep- 3 tion) of the PSDU. The data rate shall be equal to the SIGNAL field value multiplied by 100 kbit/s. The 4 High Rate PHY supports four mandatory rates given by the following 8 bit words which represent the rate in 5 units of 100 kbit/s, where the lsb shall be transmitted first in time: 6 7 a) X'0A' (msb to lsb) for 1 Mbit/s 8 b) X'14' (msb to lsb) for 2 Mbit/s 9 c) X’37’ (msb to lsb) for 5.5 Mbit/s 10 d) X’6E’ (msb to lsb) for 11 Mbit/s 11 12 The High Rate PHY rate change capability is described in 18.2.3.14. This field shall be protected by the 13 CCITT CRC-16 frame check sequence described in 18.2.3.6. 14 15 16 18.2.3.4 Long PLCP SERVICE (SERVICE) field 17 18 Three bits have been defined in the SERVICE field to support the high rate extension. The right most bit (bit 19 7) shall be used to supplement the LENGTH field described in 18.2.3.5. Bit 3 shall be used to indicate 20 whether the modulation method is CCK <0> or PBCC <1> as shown in Table 1. Bit 2 is used to indicate that 21 the transmit frequency and symbol clocks are derived from the same oscillator. This Locked Clocks bit shall 22 be set by the PHY layer based on its implementation configuration. The SERVICE field shall be transmitted 23 b0 first in time and shall be protected by the CCITT CRC-16 frame check sequence described in 18.2.3.6. 24 An IEEE802.11 compliant device shall set the values of the bits b0, b1, b4, b5 and b6 to 0. 25 26 Table 1. SERVICE field definitions 27 28 29 b0 b1 b2 b3 b4 b5 b6 b7 30 Reserved Reserved Locked Mod. Selec- Reserved Reserved Reserved Length 31 Clocks Bit tion Bit Exten- 32 0 = not 0 = CCK sion Bit 33 1 = locked 1 = PBCC 34 35 36 18.2.3.5 Long PLCP Length (LENGTH) field 37 38 The PLCP length field shall be an unsigned 16 bit integer which indicates the number of microseconds 39 required to transmit the PSDU. The transmitted value shall be determined from the LENGTH and DataRate 40 parameters in the TXVECTOR issued with the PHY-TXSTART.request primitive described in subclause 41 18.4.4.2. 42 43 The length field provided in the TXVECTOR is in octets and is converted to microseconds for inclusion in 44 the PLCP LENGTH field. The LENGTH field is calculated as follows: Since there is an ambiguity in the 45 number of octets that is described by a length in integer microseconds for any data rate over 8 Mbit/s, a 46 Length Extension bit shall be placed at bit position b7 in the SERVICE field to indicate when the smaller 47 potential number of octets is correct. 48 49 a) 5.5Mbit/s CCK Length = number of octets * 8/5.5, rounded up to the next integer. 50 b) 11Mbit/s CCK Length = number of octets * 8/11, rounded up to the next integer and the service 51 field b7 bit shall indicate a ‘0’ if the rounding took less than 8/11 or a ‘1’ if the 52 rounding took more than or equal to 8/11. 53 c) 5.5 Mbit/s PBCC Length = (number of octets + 1)* 8/5.5, rounded up to the next integer. 54 55 Copyright © 2001 IEEE. All rights reserved . 16 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 d) 11 Mbit/s PBCC Length = (number of octets + 1)* 8/11, rounded up to the next integer and the ser- 1 vice field b7 bit shall indicate a ‘0’ if the rounding took less than 8/11 or a ‘1’ if 2 the rounding took more than or equal to 8/11. 3 4 At the receiver, the number of octets in the MPDU is calculated as follows: 5 6 a) 5.5 Mbit/s CCK number of octets = Length * 5.5/8, rounded down to the next integer 7 b) 11 Mbit/s CCK number of octets = Length * 11/8, rounded down to the next integer, minus 1 if 8 the service field b7 bit is a ‘1’. 9 c) 5.5 Mbit/s PBCC number of octets = (Length * 5.5/8) -1, rounded down to the next integer 10 d) 11 Mbit/s PBCC number of octets = (Length * 11/8) -1, rounded down to the next integer, minus 1 11 if the service field b7 bit is a ‘1’. 12 13 An example for an 11 Mbit/s calculation described in psuedocode form is shown below. 14 15 At the transmitter, the values of the Length field and Length Extension bit are calculated as follows: 16 17 LENGTH’ = ((number of octets + P) *8) / R 18 LENGTH = Ceiling(LENGTH’) 19 20 IF (R = 11) AND (LENGTH - LENGTH’) >= 8/11) 21 Then LengthExtension = 1 22 Else LengthExtension = 0 23 Where: 24 R = data rate in Mbit/s 25 26 P = 0 for CCK, =1 for PBCC 27 Ceiling(X) returns the smallest 28 integer value greater than or 29 equal to X. 30 31 At the receiver, the number of octets in the MPDU is calculated as follows: 32 33 number of octets = Floor(((Length*R) / 8) - P) - LengthExtension 34 35 Where: 36 R = data rate in Mbit/s 37 P = 0 for CCK, =1 for PBCC 38 Floor(X) returns the largest 39 integer value less than or 40 equal to X. 41 42 Table 2 shows an example calculation for several packet lengths of CCK at 11 Mbit/s: 43 44 Table 2-Example of LENGTH calculations for CCK 45 46 Length 47 Octets LENGTH TX Octets LENGTH Extension floor(X) RX Octets 48 *8/11 *11/8 bit 49 1023 744 744 0 1023 1023 1023 50 51 1024 744.7273 745 0 1024.375 1024 1024 52 1025 745.4545 746 0 1025.75 1025 1025 53 1026 746.1818 747 1 1027.125 1027 1026 54 55 Copyright © 2001 IEEE. All rights reserved . 17 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: Table 3 shows an example calculation for several packet lengths of PBCC at 11 Mbit/s: 1 2 Table 3-Example of LENGTH calculations for PBCC 3 4 Length 5 (Octets (LENGTH TX Octets LENGTH Extension floor(X) RX Octets 6 *8/11) + 1 *11/8) - 1 bit 7 1023 744.7273 745 0 1023.375 1023 1023 8 1024 745.4545 746 0 1024.750 1024 1024 9 10 1025 746.1818 747 1 1026.125 1026 1025 11 1026 746.9091 747 0 1026.125 1026 1026 12 13 This example illustrates why normal rounding or truncation of the number will not produce the right result. 14 The length field is defined in units of microseconds, and must correspond to the actual length and the num- 15 ber of octets must be exact. 16 17 The lsb (least significant bit) shall be transmitted first in time. This field shall be protected by the CCITT 18 CRC-16 frame check sequence described in subclause 18.2.3.6. 19 20 21 18.2.3.6 PLCP CRC (CCITT CRC-16) field 22 23 The SIGNAL, SERVICE, and LENGTH fields shall be protected with a CCITT CRC-16 FCS (frame check 24 sequence). The CCITT CRC-16 FCS shall be the one’s complement of the remainder generated by the mod- 25 ulo 2 division of the protected PLCP fields by the polynomial: 26 27 x16 + x12 + x5 + 1 28 29 The protected bits shall be processed in transmit order. All FCS calculations shall be made prior to data 30 scrambling. A schematic of the processing is shown in Figure 3 31 32 As an example, the SIGNAL, SERVICE, and LENGTH fields for a DBPSK signal with a PPDU length of 33 192 µs (24 octets) would be given by the following: 34 35 0101 0000 0000 0000 0000 0011 0000 0000 (leftmost bit (b0) transmitted first in time) 36 b0.................................................................b48 37 38 39 The one’s complement FCS for these protected PLCP Preamble bits would be the following: 40 41 0101 1011 0101 0111 (leftmost bit (b0) transmitted first in time) 42 b0.........................b16 43 44 Figure 3 depicts this example. 45 46 An illustrative example of the CCITT CRC-16 FCS using the information from Figure 3 follows in Figure 4. 47 48 18.2.3.7 Long PLCP Data Modulation and Modulation Rate Change 49 50 The long PLCP preamble and header shall be transmitted using the 1 Mbit/s DBPSK modulation. The SIG- 51 NAL and SERVICE fields combined shall indicate the modulation which shall be used to transmit the 52 PSDU. The SIGNAL field indicates the rate and the SERVICE field indicates the modulation. The transmit- 53 ter and receiver shall initiate the modulation and rate indicated by the SIGNAL and SERVICE fields starting 54 55 Copyright © 2001 IEEE. All rights reserved . 18 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 TRANSMIT AND RECEIVE PLCP HEADER 5 CCIT CRC-16 CALCULATOR 6 7 8 SERIAL DATA CCITT SERIAL DATA 9 INPUT CRC-16 OUTPUT 10 11 12 PRESET 13 TO ONES 1. PRESET TO ALL ONES 14 2. SHIFT SIGNAL, SERVICE LENGTH FIELDS 15 THROUGH THE SHIFT REGISTER 3. TAKE ONES COMPLEMENT OF REMAINDER 16 4. TRANSMIT OUT SERIAL X15 FIRST 17 18 19 20 21 22 23 24 CCITT CRC-16 POLYNOMIAL: G(x) = X 16 + X12 + X 5 + 1 25 26 SERIAL DATA 27 INPUT + X15 X14 X13 X12 + X11 X10 X9 X8 X7 X6 X 5 + X4 X3 X2 X1 X 0 28 29 30 31 32 33 34 35 36 37 38 SERIAL DATA OUTPUT 39 ONES COMPLEMENT (X15 FIRST) 40 41 42 43 Figure 3—CCITT CRC-16 Implementation 44 45 with the first octet of the PSDU. The PSDU transmission rate shall be set by the DATARATE parameter in 46 the TXVECTOR issued with the PHY-TXSTART.request primitive described in subclause 18.4.4.1. 47 48 18.2.3.8 Short PLCP Synchronization (shortSYNC) 49 50 The shortSYNC field shall consist of 56 bits of scrambled "0" bits. This field is provided so the receiver can 51 perform the necessary synchronization operations. The initial state of the scrambler (seed) shall be [001 52 1011], where the left end bit specifies the value to place in the first delay element (Z1 ) in Figure 5 and the 53 right end bit specifies the value to place in the last delay element (Z 7). 54 55 Copyright © 2001 IEEE. All rights reserved . 19 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 1 Data CRC registers msb lsb 2 3 1111111111111111 ; initialize preset to 1’s 4 0 1110111111011111 1 1101111110111110 5 0 1010111101011101 6 1 0101111010111010 7 0 1011110101110100 0 0110101011001001 8 0 1101010110010010 9 0 1011101100000101 10 0 0110011000101011 0 1100110001010110 11 0 1000100010001101 12 0 0000000100111011 13 0 0000001001110110 0 0000010011101100 14 0 0000100111011000 15 0 0001001110110000 16 0 0010011101100000 0 0100111011000000 17 0 1001110110000000 18 0 0010101100100001 19 0 0101011001000010 0 1010110010000100 20 1 0101100100001000 21 1 1010001000110001 22 0 0101010001000011 0 1010100010000110 23 0 0100000100101101 24 0 1000001001011010 25 0 0001010010010101 0 0010100100101010 26 0 0101001001010100 27 0 1010010010101000 28 0101101101010111 ; one’s complement, result = CRC FCS parity 29 Figure 4—Example CRC calculation 30 31 32 33 34 35 18.2.3.9 Short PLCP Start Frame Delimiter Field (shortSFD) 36 37 38 The shortSFD shall be a 16 bit field and be the time reverse of the field of the SFD in the long PLCP pream- 39 ble (subclause18.2.3.2). The field is the bit pattern 0000 0101 1100 1111. The right end bit shall be transmit- 40 ted first in time. A receiver not configured to use the short header option will not detect this SFD. 41 42 18.2.3.10 Short PLCP SIGNAL Field (shortSignal) 43 44 45 The 8 bit SIGNAL Field of the short header indicates to the PHY the data rate which shall be used for trans- 46 mission (and reception) of the PSDU. A PHY operating with a HR/DSSS/short option supports three manda- 47 tory rates given by the following 8 bit words, where the lsb shall be transmitted first in time and the number 48 represents the rate in units of 100 kBit/s: 49 50 a) X’14’(msb to lsb) for 2 Mbit/s 51 52 b) X’37’(msb to lsb) for 5.5 Mbit/s 53 c) X’6E’(msb to lsb) for 11 Mbit/s 54 55 Copyright © 2001 IEEE. All rights reserved . 20 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.2.3.11 Short PLCP SERVICE Field (shortService) 1 2 The SERVICE field in the short header shall be the same as the SERVICE field described in subclause 3 18.2.3.4. 4 5 6 18.2.3.12 Short PLCP Length Field (shortLENGTH) 7 8 The LENGTH field in the short header shall be the same as the LENGTH field described in subclause 9 18.2.3.5 10 11 18.2.3.13 Short CCITT CRC-16 Field (shortCRC) 12 13 The CRC in the short header shall be the same as the CRC field as defined in subclause 18.2.3.6. The CRC- 14 16 is calculated over the shortSIGNAL, shortSERVICE, and shortLENGTH fields. 15 16 17 18.2.3.14 Short PLCP Data Modulation and Modulation rate Change 18 19 The short PLCP preamble shall be transmitted using the 1 Mbit/s DBPSK modulation. The short PLCP 20 header shall be transmitted using the 2 Mbit/s modulation. The SIGNAL and SERVICE fields combined 21 shall indicate the modulation which shall be used to transmit the PSDU. The SIGNAL field indicates the rate 22 and the SERVICE field indicates the modulation. The transmitter and receiver shall initiate the modulation 23 and rate indicated by the SIGNAL and SERVICE fields starting with the first octet of the PSDU. The 24 PSDU transmission rate shall be set by the DATARATE parameter in the TXVECTOR issued with the 25 PHY-TXSTART.request primitive described in subclause 18.4.4.1. 26 27 18.2.4 PLCP/High Rate PHY data scrambler and descrambler 28 29 The polynomial G(z) = z –7 + z –4 + 1 shall be used to scramble all bits transmitted. The feedthrough configura- 30 tion of the scrambler and descrambler is self-synchronizing, which requires no prior knowledge of the transmit- 31 ter initialization of the scrambler for receive processing. Figure 5 and Figure 6 show typical implementations of 32 the data scrambler and descrambler, but other implementations are possible. 33 34 The scrambler shall be initialized as specified in subclause 18.2.3.8 for the short PLCP and subclause 35 18.2.3.1 for the long PLCP. For a long preamble, this shall result in the scrambler registers Z1 through Z7 in 36 Figure 5 having the data pattern: [1101100] (i.e. Z1=1... Z7=0) when the scrambler is first started. The 37 scrambler shall be initialized with the reverse pattern, [0011011] when transmitting the optional short pre- 38 amble. 39 40 41 Scrambler Polynomial; G(z) = Z-7 +Z-4 +1 42 SERIAL DATA 43 OUTPUT 44 SERIAL DATA 45 INPUT XOR Z 1 Z2 Z3 Z4 Z 5 Z6 Z7 46 47 48 49 50 XOR 51 52 53 Figure 5—Data scrambler 54 55 Copyright © 2001 IEEE. All rights reserved . 21 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: Descrambler Polynomial; G(z) = Z- 7 +Z -4 +1 1 2 3 SERIAL DATA INPUT Z1 Z2 Z3 Z4 Z 5 Z 6 Z7 4 5 6 7 8 9 XOR XOR 10 11 12 SERIAL DATA OUTPUT 13 14 Figure 6—Data descrambler 15 16 18.2.5 PLCP transmit procedure 17 18 19 The transmit procedures for a High Rate PHY using the long PLCP preamble and header are the same as 20 those described in IEEE 802.11 Std- 1999, subclauses 15.2.7 and 15.2.8 and do not change apart from the 21 ability to transmit 5.5 and 11 Mbit/s. 22 23 The procedures for a transmitter employing HR/DSSS/short and HR/DSSS/PBCC/short are the same except 24 for length and rate changes. The decision to use a long or short PLCP is beyond the scope of this standard. 25 26 The PLCP transmit procedure is shown in Figure 7. 27 28 29 A PHY-TXSTART.request(TXVECTOR) primitive will be issued by the MAC to start the transmission of a 30 PPDU. In addition to DATARATE and LENGTH other transmit parameters such as PREAMBLE_TYPE and 31 MODULATION are set via the PHY-SAP with the PHY-TXSTART.request(TXVECTOR) as described in 32 18.3.5. The SIGNAL, SERVICE and LENGTH fields of the PLCP header are calculated as described in sub- 33 clause 18.2.3. 34 35 The PLCP shall issue PMD_ANTSEL, PMD_RATE, and PMD_TXPWRLVL primitives to configure the 36 PHY. The PLCP shall then issue a PMD_TXSTART.request and the PHY entity shall immediately initiate data 37 scrambling and transmission of the PLCP Preamble based on the parameters passed in the PHY- 38 TXSTART.request primitive. The time required for TX power on ramp described in 18.4.7.6 shall be included 39 in the PLCP synchronization field. Once the PLCP Preamble transmission is complete, data shall be exchanged 40 between the MAC and the PHY by a series of PHY-DATA.request(DATA) primitives issued by the MAC and 41 PHY-DATA.confirm primitives issued by the PHY. The modulation and rate change, if any, shall be initiated 42 with the first data symbol of the PSDU as described in 18.2.3.7 and 18.2.3.14. The PHY proceeds with PSDU 43 transmission through a series of data octet transfers from the MAC. At the PMD layer, the data octets are sent 44 in lsb to msb order and presented to the PHY layer through PMD_DATA.request primitives. Transmission can 45 be prematurely terminated by the MAC through the primitive PHY-TXEND.request. PHY-TXSTART shall be 46 disabled by the issuance of the PHY-TXEND.request. Normal termination occurs after the transmission of the 47 final bit of the last PSDU octet calculated from the number supplied in the PHY preamble LENGTH and SER- 48 VICE fields using the equations specified in 18.2.3.5. The PPDU transmission shall be completed and the PHY 49 entity shall enter the receive state (i.e., PHY-TXSTART shall be disabled). It is recommended that modulation 50 continue during power-down to prevent radiating a CW carrier. Each PHY-TXEND.request is acknowledged 51 with a PHY-TXEND.confirm primitive from the PHY. 52 53 A typical state machine implementation of the PLCP transmit procedure is provided in Figure 8. 54 55 Copyright © 2001 IEEE. All rights reserved . 22 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 PHY PHY 2 MAC PLCP PMD 3 4 5 6 PHY_TXSTART.re q PMD_TXPWRLVL.req 7 (TXVECTOR) PMD_ RATE.req 8 PMD_ ANTSEL.req 9 10 PMD_TXSTART.req TX Power RAMP on 11 Scramble start PMD_DATA.req 12 SYNC ......... PHY_TXSTART.confirm 13 14 PHY_DATA.re q 15 SFD PMD_RATE .req CRC16 start 16 17 SIGNAL, SERVICE, LENGTH PMD_DATA.req 18 19 Time 20 ......... 21 22 CRC16 end 23 CRC 24 PHY_DATA.confirm PMD_RATE.req 25 PMD_MODULATION.req 26 PMD_DATA.req 27 28 29 PSDU 30 ......... ......... 31 32 33 34 PHY_TXEND.req PMD_TXEND.req TX Power RAMP off 35 PHY_TXEND.conf 36 37 38 Figure 7—PLCP Transmit Procedure 39 40 41 18.2.6 PLCP receive procedure 42 43 The receive procedures for receivers configured to receive the mandatory and optional PLCPs, Rates and 44 Modulations are described in this section. A receiver that supports this high rate extension of the standard is 45 capable of receiving 5.5 Mbit/s and 11 Mbit/s in addition to 1 and 2 Mbit/s. If the PHY implements the short 46 preamble option, it shall detect both short and long preamble formats and indicate which type of preamble 47 was received in the RXVECTOR. If the PHY implements the PBCC modulation option it shall detect either 48 CCK or PBCC modulations as indicated in the SIGNAL field and shall report the type of modulation used in 49 the RXVECTOR. 50 51 The receiver shall implement the CCA procedure as define in subclause 18.4.8.4. 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 23 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 1 PHY_TXSTART.request(TXVECTOR) 2 3 4 initialize TX PSDU O CTET 5 6 PMD_TXPWRLVL.req PHY_DATA.req(DATA) PMD_ANTSEL.req 7 get octet from MAC PMD_ PREAMBLE.req 8 Set Octet bit count 9 10 11 TX SYNC PATTERN TX SYMBOL 12 13 PMD_TXSTART.req PMD_DATA.req 14 PMD_RATE.req (DBPSK) TX 128 scrambled 1’s 15 or 56 scrambled 0’s 16 TX 16 bit SFD 17 Decrement Bit 18 decrement bit count 19 by bits per symbol bit count <> 0 20 TX PLCP DATA 21 bit count = 0 22 TX 8 bit SIGNAL Decrement Length 23 TX 8 bit SERVICE 24 TX 16 bit LENGTH decrement length count length <> 0 25 TX 16 bit CRC 26 27 length = 0 28 29 30 SETUP PSDU TX Switch to RX STATE 31 Set Rate A 32 PMD_RATE.req ( X ) Set modulation 33 PMD_ MODULATION.req 34 set length count 35 36 37 38 A At any stage in the above flow diagram, if a PHY_TXTEND.request is received 39 40 Figure 8—PLCP transmit state machine 41 42 43 44 Upon receiving a PPDU the receiver shall distinguish between a long and short header format by the value 45 of the SFD as specified in 18.2.2 The receiver shall demodulate a long PLCP header using BPSK at 1 Mbit/ 46 s. The receiver shall demodulate a short PLCP header using QPSK at 2 Mbit/s. The receiver shall use the 47 SIGNAL and SERVICE fields of the PLCP header to determine the data rate and the modulation of the 48 PSDU. 49 50 The PLCP receive procedure is shown in Figure 9. 51 52 In order to receive data, PHY-TXSTART.request shall be disabled so that the PHY entity is in the receive 53 state. Further, through station management via the PLME, the PHY is set to the appropriate channel and the 54 55 Copyright © 2001 IEEE. All rights reserved . 24 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 PHY PLCP PHY 2 MAC PMD 3 4 5 6 7 PMD_ED PHY_CCA.ind(BUSY) 8 PMD_CS 9 SYNC Descrambler start PMD_DATA.ind 10 11 12 13 SFD 14 Time PMD_ RATE.req Rate change start CRC start 15 16 LENGTH SIG NAL, SERVICE, PMD_DATA.ind 17 18 19 20 21 22 CRC end CRC 23 PHY_RXSTART.ind PMD_RATE.req Modulation and rate change start 24 (RXVECTOR) PMD_ MODULATION.req 25 PMD_DATA.ind PSDU PHY_DATA.ind(DATA) 26 27 28 29 30 31 PHY_RXEND.ind(RXERROR)/ PHY_CCA(IDLE) PMD_ED or PMD_CS 32 33 34 35 36 Figure 9—PLCP receive procedure 37 38 CCA method is chosen. Other receive parameters such as receive signal strength indication (RSSI), signal 39 quality (SQ), and indicated DATARATE may be accessed via the PHY-SAP. 40 41 Upon receiving the transmitted energy, according to the selected CCA mode, the PMD_ED shall be enabled 42 (according to 18.4.8.4) as the RSSI strength reaches the ED_THRESHOLD and/or PMD_CS shall be 43 enabled after code lock is established. These conditions are used to indicate activity to the MAC via PHY- 44 CCA.indicate according to 18.4.8.4. PHY-CCA.indicate(BUSY) shall be issued for energy detection and/or 45 code lock prior to correct reception of the PLCP header. The PMD primitives PMD_SQ and PMD_RSSI are 46 issued to update the RSSI and SQ parameters reported to the MAC. 47 48 After PHY-CCA.indicate is issued, the PHY entity shall begin searching for the SFD field. Once the SFD 49 field is detected, CCITT CRC-16 processing shall be initiated and the PLCP SIGNAL, SERVICE and 50 LENGTH fields are received. The CCITT CRC-16 FCS shall be processed. If the CCITT CRC-16 FCS 51 check fails, the PHY receiver shall return to the RX Idle state as depicted in Figure 10. Should the status of 52 CCA return to the IDLE state during reception prior to completion of the full PLCP processing, the PHY 53 receiver shall return to the RX Idle state. 54 55 Copyright © 2001 IEEE. All rights reserved . 25 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: If the PLCP Header reception is successful (and the SIGNAL field is completely recognizable and sup- 1 ported), a PHY-RXSTART.indicate(RXVECTOR) shall be issued. The RXVECTOR associated with this 2 primitive includes the SIGNAL field, the SERVICE field, the PSDU length in octets (calculated from the 3 LENGTH field in microseconds and the DATARATE in Mbit/s in accordance with the formula in subclause 4 18.2.3.5), RXPREAMBLE_TYPE (which is an enumerated type taking on values SHORTPREAMBLE or 5 LONGPREAMBLE), the antenna used for receive (RX_ANTENNA), RSSI, and SQ. 6 7 The received PSDU bits are assembled into octets and presented to the MAC using a series of PHY- 8 DATA.indicate(DATA) primitive exchanges. The rate and modulation change indicated in the SIGNAL 9 field shall be initiated with the first symbol of the PSDU as described in 18.2.5. The PHY proceeds with 10 PSDU reception. After the reception of the final bit of the last PSDU octet indicated by the PLCP Preamble 11 LENGTH field, the receiver shall be returned to the RX Idle state as shown in Figure 10. A PHY- 12 RXEND.indicate(NoError) primitive shall be issued. A PHY-CCA.indicate(IDLE) primitive shall be issued 13 following a change in PHYCS (PHY carrier sense) and/or PHYED (PHY energy detection) according to the 14 selected CCA method. 15 16 In the event that a change in PHYCS or PHYED would cause the status of CCA to return to the IDLE state 17 before the complete reception of the PSDU as indicated by the PLCP LENGTH field, the error condition 18 PHY-RXEND.indicate(CarrierLost) shall be reported to the MAC. The High Rate PHY shall ensure that the 19 CCA will indicate a busy medium for the intended duration of the transmitted PPDU. 20 21 If the PLCP Header is successful, but the indicated rate or modulation in the SIGNAL and SERVICE fields 22 are not within the capabilities of the receiver, a PHY-RXSTART.indicate shall not be issued. The PHY shall 23 issue the error condition PHY-RXEND.indicate(UnsupportedRate). If the PLCP Header is invalid, a PHY- 24 RXSTART.indicate shall not be issued and the PHY shall issue the error condition PHY-RXEND.indi- 25 cate(FormatViolation). Also, in both cases, the High Rate PHY shall ensure that the CCA shall indicate a 26 busy medium for the intended duration of the transmitted PSDU as indicated by the LENGTH field. The 27 intended duration is indicated by the LENGTH field (LENGTH × 1 µs). 28 29 A typical state machine implementation of the PLCP receive procedure is provided in Figure 10. 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 26 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 Reset 2 3 RX Idle State 4 5 Wait for PMD_ED.ind and/or 6 PMD_CS.ind as 7 needed for CCA mode RX SYMBOL 8 9 PHY_DATA.ind 10 Detect SYNC PATTERN CCA(IDLE) CCA(BUSY) 11 Wait until SFD 12 is detected SIGNAL not Valid Decrement Length PHY_CCA.ind 13 PHY_RXEND.ind Decrement count (IDLE) (carrier lost) by 1 microsecond 14 set 15 RXPLCP Fields 16 RX 8 bit SIGNAL RX 8 bit SERVICE Decrement Time BYTE Assimilation 17 PHY_CCA.ind RX 16 bit LENGTH Wait for intended Increment bit count 18 (IDLE) end of PSDU set octet bit count length <> 0 PHY_DATA.ind(DATA) 19 20 time = 0 PHY_CCA.ind RX PLCP CRC length = 0 21 (IDLE) or End of wait END OF PSDU R X 22 RX and Test CRC CRC FAIL PHY_RXEND.ind 23 PHY_CCA.ind(IDLE) (No_Error) 24 PHY_CCA.ind PHY_CCA.ind length = 0 (IDLE) CRC Correct (IDLE) 25 26 Decrement Length VALIDATE PLCP 27 Decrement Check PLCP Length 28 Count 29 PLCP Correct PLCP Field 30 Out of Spec SETUP PSDU RX 31 set RATE 32 set MODULATION 33 set length count set octet bit count 34 PHY_RXSTART.ind 35 (RXVECTOR) 36 37 Figure 10—PLCP receive state machine 38 39 40 41 42 43 44 45 18.3 High Rate physical layer management entity (PLME) 46 47 18.3.1 PLME_SAP sublayer management primitives 48 49 Table 4 lists the MIB attributes that may be accessed by the PHY sublayer entities and intralayer or higher 50 layer management entities (LME). These attributes are accessed via the PLME-GET, PLME-SET, and 51 PLME-RESET primitives defined in IEEE Std 802.11- 1999 Clause 10. 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 27 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.3.2 High Rate P HY MIB 1 2 All High Rate PHY MIB attributes are defined in Annex D of IEEE Std 802.11- 1999, with specific values 3 defined in Table 4. 4 5 6 Table 4—MIB Attribute Default Values/Ranges 7 8 Operational 9 Managed object Default value/range semantics 10 dot11PhyOperationTable 11 12 dot11PHYType High Rate -2.4(X’05’) Static 13 dot11TempType Implementation dependent Static 14 dot11CurrentRegDomain Implementation dependent Static 15 dot11ShortPreambleOptionImpleme Implementation dependent Static 16 nted 17 18 dot11PBCCOptionImplemented Implementation dependent Static 19 dot11ChannelAgility Present Implementation dependent Static 20 dot11ChannelAgilityEnabled False/Boolean Dynamic 21 dot11PhyAntennaTable 22 23 dot11CurrentTxAntenna Implementation dependent Dynamic 24 dot11DiversitySupport Implementation dependent Static 25 dot11CurrentRxAntenna Implementation dependent Dynamic 26 dot11PhyTxPowerTable 27 28 dot11NumberSupportedPowerLevels Implementation dependent Static 29 dot11TxPowerLevel1 Implementation dependent Static 30 dot11TxPowerLevel2 Implementation dependent Static 31 dot11TxPowerLevel3 Implementation dependent Static 32 33 dot11TxPowerLevel4 Implementation dependent Static 34 dot11TxPowerLevel5 Implementation dependent Static 35 dot11TxPowerLevel6 Implementation dependent Static 36 dot11TxPowerLevel7 implementation dependent Static 37 38 dot11TxPowerLevel8 Implementation dependent Static 39 dot11CurrentTxPowerLevel Implementation dependent Dynamic 40 dot11PhyDSSSTable 41 dot11CurrentChannel Implementation dependent Dynamic 42 43 dot11CCAModeSupported Implementation dependent Static 44 dot11CurrentCCAMode Implementation dependent Dynamic 45 dot11EDThreshold Implementation dependent Dynamic 46 dot11AntennasListTable 47 48 dot11SupportTxAntenna Implementation dependent Static 49 dot11SupportRxAntenna Implementation dependent Static 50 dot11DiversitySelectionRx Implementation dependent Dynamic 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 28 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table 4—MIB Attribute Default Values/Ranges (continued) 1 2 Operational 3 Managed object Default value/range 4 semantics 5 dot11RegDomainsSupportedTable 6 dot11RegDomainsSupported Implementation dependent Static 7 dot11SupportedDataRatesTx Table Tx X'02', X'04,' X’0B’, Static 8 X’16’ 9 dot11SupportedDataRatesRx Table Rx X'02', X'04,' X’0B’, Static 10 X’16’ 11 NOTE—The column titled “Operational semantics” contains two types: static and dynamic. 12 Static MIB attributes are fixed and cannot be modified for a given PHY implementation. 13 MIB attributes defined as dynamic can be modified by some management entities. 14 15 16 18.3.3 DS PHY characteristics 17 18 The static DS PHY characteristics, provided through the PLME-CHARACTERISTICS service primitive, 19 are shown in Table 5. The definitions of these characteristics are in IEEE Std 802.11- 1999 subclause 10.4.3. 20 21 22 Table 5—High Rate PHY Characteristics 23 24 Characteristic Value 25 26 aSlotTime 20 µs 27 aSIFSTime 10 µs 28 29 aCCATime <15 µs 30 aRxTxTurnaroundTime <5 µs 31 32 aTxPLCPDelay Implementors may choose any value for this delay as long 33 as the requirements of aRxTxTurnaroundTime are met. 34 aRxPLCPDelay Implementors may choose any value for this delay as long 35 as the requirements of aSIFSTime and aCCATime are met. 36 37 aRxTxSwitchTime <5 µs 38 aTxRampOnTime Implementors may choose any value for this delay as long 39 as the requirements of aRxTxTurnaroundTime are met. 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 29 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: Table 5—High Rate PHY Characteristics 1 2 3 Characteristic Value 4 aTxRampOffTime Implementors may choose any value for this delay as long 5 as the requirements of aSIFSTime are met. 6 7 aTxRFDelay Implementors may choose any value for this delay as long as the requirements of aRxTxTurnaroundTime are met. 8 9 aRxRFDelay Implementors may choose any value for this delay as long 10 as the requirements of aSIFSTime and aCCATime are met. 11 aAirPropagationTime 1 µs 12 13 aMACProcessingDelay 0 (not applicable) 14 aPreambleLength 144 µs 15 16 aPLCPHeaderLength 48 bits 17 aMPUMaxLength 14< x < (212 – 1) 18 19 aCWmin 31 20 aCWmax 1023 21 22 23 18.3.4 High Rate TXTIME calculation 24 25 26 The value of the TXTIME parameter returned by the PLME-TXTIME.confirm primitive shall be calculated 27 according to the following equation: 28 29 TXTIME = PreambleLength + PLCPHeaderTime + Ceiling(((LENGTH+PBCC) x 8) / DAT- 30 ARATE) 31 32 Where LENGTH and DATARATE are values from the TXVECTOR parameter of the corresponding 33 PLME-TXTIME.request primitive. PBCC has a value of 1 if the SIGNAL value from the TXVECTOR 34 parameter specifies PBCC and has a value of 0 otherwise. The value of PreambleLength is 144 microsec- 35 onds if the TXPREAMBLE_TYPE value from the TXVECTOR parameter indicates " LONGPREAMBLE" or 36 72 microseconds if the TXPREAMBLE_TYPE value from the TXVECTOR parameter indicates "SHORT- 37 PREAMBLE ". The value of PLCPHeaderTime is 48 microseconds if the TXPREAMBLE_TYPE value from 38 the TXVECTOR parameter indicates " LONGPREAMBLE" or 24 microseconds if the 39 TXPREAMBLE_TYPE value from the TXVECTOR parameter indicates "SHORTPREAMBLE". LENGTH 40 is in units of octets. DATARATE is in units of Mbit/s. Ceiling is a function which returns the smallest inte- 41 ger value greater than or equal to its argument value. 42 43 18.3.5 Vector Descriptions 44 45 46 Several service primitives include a parameter vector. These vectors are a list of parameters as described in 47 Table 6. DATARATE and LENGTH are described in subclause 12.3.4.4 in IEEE Std 802.11- 1999. The 48 remaining parameters are considered to be management parameters and are specific to this PHY. 49 Table 6, Parameter Vectors 50 Parameter Associated Vector Value 51 DATARATE RXVECTOR, TXVECTOR The rate used to transmit the 52 PSDU in Mbit/s 53 LENGTH RXVECTOR, TXVECTOR The length of the PSDU in octets. 54 55 Copyright © 2001 IEEE. All rights reserved . 30 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 PREAMBLE_TYPE RXVECTOR, TXVECTOR The preamble used for the transmis- 1 sion of this PPDU. This is an enu- 2 merated type that can take the value 3 SHORTPREAMBLE or LONGPRE- 4 AMBLE. 5 MODULATION RXVECTOR, TXVECTOR The modulation used for the trans- mission of this PSDU. This is an 6 integer where 0 means CCK and 1 7 means PBCC. 8 9 10 18.4 High Rate PMD sublayer 11 12 18.4.1 Scope and field of application 13 14 This subclause describes the Physical Medium Dependent (PMD) services provided to the PLCP for the 15 High Rate PHY. Also defined in this subclause are the functional, electrical, and RF characteristics required 16 for interoperability of implementations conforming to this specification. The relationship of this specifica- 17 tion to the entire High Rate physical layer is shown in Figure 11. 18 19 20 21 22 23 MAC MAC 24 MAC MANAGE- MENT 25 26 27 28 PHY CONVERGENCE LAYER MANAGE- 29 MENT 30 PHY 31 DSSS PLCP SUBLAYER STATION 32 PMD SAP 33 MANAGEMENT DSSS PMD SUBLAYER 34 35 Figure 11. Layer Reference Model 36 37 38 18.4.2 Overview of service 39 40 41 The High Rate PMD sublayer accepts PLCP sublayer service primitives and provides the actual means by 42 which data is transmitted or received from the medium. The combined function of High Rate PMD sublayer 43 primitives and parameters for the receive function results in a data stream, timing information, and associ- 44 ated received signal parameters being delivered to the PLCP sublayer. A similar functionality is provided for 45 data transmission. 46 47 18.4.3 Overview of interactions 48 49 The primitives associated with the PLCP sublayer to the High Rate PMD fall into two basic categories: 50 51 52 a) Service primitives that support PLCP peer-to-peer interactions 53 b) Service primitives that have local significance and that support sublayer-to-sublayer interactions. 54 55 Copyright © 2001 IEEE. All rights reserved . 31 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.4 Basic service and options 1 2 All of the service primitives described in this subclause are considered mandatory unless otherwise speci- 3 fied. 4 5 18.4.4.1 PMD_SAP peer-to-peer service primitives 6 7 Table 7 indicates the primitives for peer-to-peer interactions. 8 9 10 Table 7—PMD_SAP Peer-to-Peer Service Primitives 11 12 13 Primitive Request Indicate Confirm Response 14 PMD_DATA X X 15 16 17 18.4.4.2 PMD_SAP sublayer-to-sublayer service primitives 18 19 Table 8 indicates the primitives for sublayer-to-sublayer interactions. 20 21 22 Table 8—PMD_SAP Sublayer-to-Sublayer Service Primitives 23 24 25 Primitive Request Indicate Confirm Response 26 PMD_TXSTART X 27 PMD_TXEND X 28 PMD_ANTSEL X X 29 30 PMD_TXPWRLVL X 31 PMD_MODULATIO X X 32 N 33 PMD_PREAMBLE X X 34 PMD_RATE X X 35 36 PMD_RSSI X 37 PMD_SQ X 38 PMD_CS X 39 PMD_ED X X 40 41 42 43 18.4.4.3 PMD_SAP service primitive parameters 44 45 18.4.5 PMD_SAP detailed service specification 46 47 The following subclauses describe the services provided by each PMD primitive. 48 49 18.4.5.1 PMD_DATA.request 50 51 18.4.5.1.1 Function 52 53 This primitive defines the transfer of data from the PLCP sublayer to the PMD entity. 54 55 Copyright © 2001 IEEE. All rights reserved . 32 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.1.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 6 Parameter Associated primitive Value Description 7 TXD_UNIT PMD_DATA.request 0,1: 1 Mbit/s This parameter repre- 8 00,01,11,10:2 Mbit/s sents a single block of 9 X’0’ - X’F’: 5.5 Mbit/s data, which, in turn, is X’00’ - X’FF’: 11 Mbit/s used by the PMD to be 10 differentially encoded 11 into a transmitted sym- 12 bol. The symbol itself is 13 spread by the PN code 14 prior to transmission. 15 16 17 18 18.4.5.1.3 When generated 19 20 This primitive is generated by the PLCP sublayer to request transmission of a symbol. The data clock for 21 this primitive is supplied by PMD layer based on the PN code repetition. 22 23 24 18.4.5.1.4 Effect of receipt 25 26 The PMD performs the differential encoding, PN code modulation and transmission of the data. 27 28 18.4.5.2 PMD_DATA.indicate 29 30 31 18.4.5.2.1 Function 32 33 This primitive defines the transfer of data from the PMD entity to the PLCP sublayer. 34 35 18.4.5.2.2 Semantics of the service primitive 36 37 38 The primitive provides the following parameters: 39 40 41 Parameter Associated primitive Value Description 42 RXD_UNIT PMD_DATA.indicate 0,1: 1 Mbit/s This parameter repre- 43 00,01,11,10:2 Mbit/s sents a single symbol 44 X’0’ - X’F’: 5.5 Mbit/s that has been demodu- 45 X’00’ - X’FF’: 11 Mbit/s lated by the PMD 46 entity. 47 48 49 50 18.4.5.2.3 When generated 51 52 This primitive, which is generated by the PMD entity, forwards received data to the PLCP sublayer. The 53 data clock for this primitive is supplied by PMD layer based on the PN code repetition. 54 55 Copyright © 2001 IEEE. All rights reserved . 33 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.5.2.4 Effect of receipt 1 2 The PLCP sublayer either interprets the bit or bits that are recovered as part of the PLCP convergence proce- 3 dure or passes the data to the MAC sublayer as part of the PSDU. 4 5 6 18.4.5.3 PMD_MODULATION.request 7 8 18.4.5.3.1 Function 9 10 This primitive, which is generated by the PHY PLCP sublayer, selects the modulation code that is used by 11 the High Rate PHY for transmission. 12 13 14 18.4.5.3.2 Semantics of the service primitive 15 16 The primitive provides the following parameters: 17 18 19 Parameter Associated primitive Value Description 20 21 MODULATION PMD_MODULATION.request 1MbBarker, 2MbBarker, In Receive mode, the PMD_MODULATION.indicate 5.5CCK, 11CCK , MODULATION 22 5.5PBCC or 11PBCC parameter informs the 23 PLCP layer which of 24 the PHY data modula- 25 tions was used to pro- 26 cess the PSDU portion of the PPDU. Subclause 27 18.4.6.3 provides fur- 28 ther information on the 29 High Rate PHY modu- 30 lation codes. 31 32 33 18.4.5.3.3 When generated 34 35 36 This primitive is generated by the PLCP sublayer to change or set the current High Rate PHY modulation 37 code used for the PSDU portion of a PPDU. The PMD_MODULATION.request primitive is normally 38 issued prior to issuing the PMD_TXSTART command. 39 40 18.4.5.3.4 Effect of receipt 41 42 The receipt of PMD_MODULATION selects the modulation that is used for all subsequent PSDU transmis- 43 sions. This code is used for transmission only. The High Rate PHY shall still be capable of receiving all the 44 required High Rate PHY modulations. This primitive, which is generated by the PMD entity, sets the state of 45 the PHY for demodulation of the appropriate modulation. 46 47 48 18.4.5.4 PMD_PREAMBLE.request 49 50 18.4.5.4.1 Function 51 52 This primitive, which is generated by the PHY PLCP sublayer, selects the preamble mode that is used by the 53 High Rate PHY for transmission. 54 55 Copyright © 2001 IEEE. All rights reserved . 34 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.4.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 Parameter Associated primitive Value Description 6 7 PREAMBLE PMD_PREAMBLE.request ‘0’ for long PREAMBLE selects ‘1’ for short which of the High 8 Rate PHY preamble 9 types is used for 10 PLCP transmission. 11 Subclause 18.2.2 pro- 12 vides further infor- mation on the High 13 Rate PHY preamble 14 modes. 15 16 17 18 19 18.4.5.4.3 When generated 20 21 This primitive is generated by the PLCP sublayer to change or set the current High Rate PHY preamble 22 mode used for the PLCP portion of a PPDU. The PMD_PREAMBLE.request primitive is normally issued 23 prior to issuing the PMD_TXSTART command. 24 25 18.4.5.4.4 Effect of receipt 26 27 The receipt of PMD_PREAMBLE selects the preamble mode that is used for all subsequent PSDU transmis- 28 sions. This mode is used for transmission only. The High Rate PHY shall still be capable of receiving all the 29 required High Rate PHY preambles. This primitive sets the state of the PHY for modulation of the appropri- 30 ate mode. 31 32 33 34 18.4.5.5 PMD_PREAMBLE.indicate 35 36 18.4.5.5.1 Function 37 38 This primitive, which is generated by the PMD sublayer, indicates which preamble mode was used to 39 receive the PLCP portion of the PPDU. 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 35 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.5.5.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 6 Parameter Associated primitive Value Description 7 PREAMBLE PMD_PREAMBLE.indicate ‘0’ for long In receive mode, the 8 ‘1’ for short PREAMBLE param- 9 eter informs the PLCP layer which of 10 the High Rate PHY 11 preamble modes was 12 used to send the 13 PLCP portion of the 14 PPDU. 15 16 17 18 19 20 18.4.5.5.3 When generated 21 22 This primitive is generated by the PMD sublayer when the PLCP Preamble has been properly detected. 23 24 18.4.5.5.4 Effect of receipt 25 26 27 This parameter is provided to the PLCP layer for information only. 28 29 30 31 18.4.5.6 PMD_TXSTART.request 32 33 34 18.4.5.6.1 Function 35 36 As a result of receiving a PHY_DATA.request from the MAC, the PLCP issues this primitive, which ini- 37 tiates PPDU transmission by the PMD layer. 38 39 18.4.5.6.2 Semantics of the service primitive 40 41 42 This primitive has no parameters. 43 44 18.4.5.6.3 When generated 45 46 47 This primitive is generated by the PLCP sublayer to initiate the PMD layer transmission of the PPDU. The 48 PHY-DATA.request primitive is provided to the PLCP sublayer prior to issuing the PMD_TXSTART com- 49 mand. 50 51 18.4.5.6.4 Effect of receipt 52 53 PMD_TXSTART initiates transmission of a PPDU by the PMD sublayer. 54 55 Copyright © 2001 IEEE. All rights reserved . 36 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.7 PMD_TXEND.request 1 2 18.4.5.7.1 Function 3 4 This primitive, which is generated by the PHY PLCP sublayer, ends PPDU transmission by the PMD layer. 5 6 7 18.4.5.7.2 Semantics of the service primitive 8 9 This primitive has no parameters. 10 11 18.4.5.7.3 When generated 12 13 This primitive is generated by the PLCP sublayer to terminate the PMD layer transmission of the PPDU. 14 15 18.4.5.7.4 Effect of receipt 16 17 18 PMD_TXEND terminates transmission of a PPDU by the PMD sublayer. 19 20 18.4.5.8 PMD_ANTSEL.request 21 22 18.4.5.8.1 Function 23 24 This primitive, which is generated by the PHY PLCP sublayer, selects the antenna used by the PHY for 25 transmission or reception (when diversity is disabled). 26 27 18.4.5.8.2 Semantics of the service primitive 28 29 30 The primitive provides the following parameters: 31 32 33 Parameter Associated primitive Value Description 34 ANT_STATE PMD_ANTSEL.request 1 to 256 ANT_STATE selects 35 PMD_ANTSEL.indicate which of the avail- 36 able antennas should 37 be used for transmit. The number of avail- 38 able antennas is 39 determined from the 40 MIB table parameters 41 aSuprtRxAntennas 42 and aSuprtTxAnten- nas. 43 44 45 46 18.4.5.8.3 When generated 47 48 This primitive is generated by the PLCP sublayer to select a specific antenna for transmission (or reception 49 when diversity is disabled). 50 51 18.4.5.8.4 Effect of receipt 52 53 PMD_ANTSEL immediately selects the antenna specified by ANT_STATE. 54 55 Copyright © 2001 IEEE. All rights reserved . 37 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.5.9 PMD_TXPWRLVL.request 1 2 3 18.4.5.9.1 Function 4 5 This primitive, which is generated by the PHY PLCP sublayer, selects the power level used by the PHY for 6 transmission. 7 8 9 18.4.5.9.2 Semantics of the service primitive 10 11 The primitive provides the following parameters: 12 13 14 Parameter Associated primitive Value Description 15 16 TXPWR_LEVEL PHY-TXPWR_LEVEL.request 0, 1, 2, 3 (max of 4 lev- TXPWR_LEVEL 17 els) selects which of the 18 optional transmit 19 power levels should 20 be used for the cur- 21 rent PPDU transmis- 22 sion. The number of 23 available power lev- 24 els is determined by 25 the MIB parameter 26 dot11NumberSupport 27 edPowerLevels. Sub- 28 clause 18.4.7.2 pro- 29 vides further 30 information on the 31 optional High Rate 32 PHY power level 33 control capabilities. 34 35 36 18.4.5.9.3 When generated 37 38 39 This primitive is generated by the PLCP sublayer to select a specific transmit power. This primitive is 40 applied prior to setting PMD_TXSTART into the transmit state. 41 42 18.4.5.9.4 Effect of receipt 43 44 45 PMD_TXPWRLVL immediately sets the transmit power level given by TXPWR_LEVEL. 46 47 18.4.5.10 PMD_RATE.request 48 49 50 18.4.5.10.1 Function 51 52 This primitive, which is generated by the PHY PLCP sublayer, selects the data rate that shall be used by the 53 High Rate PHY for transmission. 54 55 Copyright © 2001 IEEE. All rights reserved . 38 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.10.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 Parameter Associated primitive Value Description 6 7 RATE PMD_RATE.indicate X'0A' for 1 Mbit/s RATE selects which 8 PMD_RATE.request X'14' for 2 Mbit/s of the High Rate X’37’ for 5.5 Mbit/s 9 PHY data rates is 10 X’6E’ for 11 Mbit/s used for PSDU trans- 11 mission. Subclause 12 18.4.6.3 provides fur- 13 ther information on 14 the High Rate PHY 15 data rates. The High 16 Rate PHY rate 17 change capability is 18 fully described in 19 18.2. 20 21 22 18.4.5.10.3 When generated 23 24 This primitive is generated by the PLCP sublayer to change or set the current High Rate PHY data rate used 25 for the PSDU portion of a PPDU. 26 27 28 18.4.5.10.4 Effect of receipt 29 30 The receipt of PMD_RATE selects the rate that is used for all subsequent PSDU transmissions. This rate is 31 used for transmission only. The High Rate PHY shall still be capable of receiving all the required High Rate 32 PHY data rates. 33 34 18.4.5.11 PMD_RSSI.indicate 35 36 18.4.5.11.1 Function 37 38 This optional primitive may be generated by the PMD to provide the received signal strength to the PLCP.. 39 40 41 18.4.5.11.2 Semantics of the service primitive 42 43 The primitive provides the following parameters: 44 45 46 Parameter Associated primitive Value Description 47 RSSI PMD_RSSI.indicate 0–8 bits of RSSI The RSSI is a mea- 48 sure of the RF energy 49 received by the High 50 Rate PHY. 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 39 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.5.11.3 When generated 1 2 This primitive is generated by the PMD when the High Rate PHY is in the receive state. It is continuously 3 available to the PLCP, which, in turn, provides the parameter to the MAC entity. 4 5 6 18.4.5.11.4 Effect of receipt 7 8 This parameter is provided to the PLCP layer for information only. The RSSI may be used in conjunction 9 with SQ as part of a CCA scheme. 10 11 18.4.5.12 PMD_SQ.indicate 12 13 18.4.5.12.1 Function 14 15 16 This optional primitive, may be generated by the PMD to provide an indication of the signal quality (SQ) of 17 the High Rate PHY PN code correlation to the PLCP. SQ is a measure of the quality of BARKER code lock, 18 providing an effective measure during the full reception of a PLCP preamble and header. 19 20 18.4.5.12.2 Semantics of the service primitive 21 22 The primitive provides the following parameters: 23 24 25 Parameter Associated primitive Value Description 26 27 SQ PMD_SQ.indicate 0–8 bits of SQ This primitive is a measure of the signal 28 quality received by 29 the HR/DSSS PHY. 30 31 32 33 18.4.5.12.3 When generated 34 35 This primitive is generated by the PMD when the High Rate PHY is in the receive state and Barker code 36 lock is achieved. It is continuously available to the PLCP, which, in turn, provides the parameter to the MAC 37 entity. 38 39 18.4.5.12.4 Effect of receipt 40 41 This parameter is provided to the PLCP layer for information only. The SQ may be used in conjunction with 42 RSSI as part of a CCA scheme. 43 44 45 18.4.5.13 PMD_CS.indicate 46 47 This primitive, which is generated by the PMD, shall indicate to the PLCP layer that the receiver has 48 acquired (locked) the Barker code and data is being demodulated. 49 50 18.4.5.13.1 Function 51 52 This primitive, which is generated by the PMD, shall indicate to the PLCP layer that the receiver has 53 acquired (locked) the Barker code and data is being demodulated. 54 55 Copyright © 2001 IEEE. All rights reserved . 40 This is an unapproved IEEE Standards Draft, subject to change

IEEE P802.11b/D8.0, 1 Sept 2001 Draft Suppliment to Standard for LAN/MAN PART 11: MAC & PHY SPECIFICATIONS: 18.4.5.13.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 6 7 8 Parameter Associated primitive Value Description 9 PMD_CS PMD_CS.indicate ‘0’ for DISABLED The PMD_CS (carrier 10 ‘1’ for ENABLED sense) primitive in con- 11 junction with PMD_ED 12 provide CCA status 13 through the PLCP layer PHYCCA primitive. 14 PMD_CS indicates a 15 binary status of 16 ENABLED or DIS- 17 ABLED. PMD_CS is 18 ENABLED when the correlator SQ indicated 19 in PMD_SQ is greater 20 than the correlation 21 threshold. PMD_CS is 22 DISABLED when the 23 PMD_SQ falls below the correlation thresh- 24 old. 25 26 27 28 29 18.4.5.13.3 When generated 30 31 This primitive is generated by the PMD sublayer when the High Rate PHY is receiving a PPDU and the PN 32 code has been acquired. 33 34 18.4.5.13.4 Effect of receipt 35 36 This indicator is provided to the PLCP for forwarding to the MAC entity for information purposes through 37 the PHYCCA indicator. This parameter shall indicate that the RF medium is busy and occupied by a High 38 Rate PHY signal. The High Rate PHY should not be placed into the transmit state when PMD_CS is 39 ENABLED. 40 41 18.4.5.14 PMD_ED.indicate 42 43 18.4.5.14.1 Function 44 45 This optional primitive may be generated by the PMD to provide an indication that the receiver has detected 46 RF energy indicated by the PMD_RSSI primitive that is above a predefined threshold. 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 41 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.14.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 Parameter Associated primitive Value Description 6 7 PMD_ED PMD_ED.indicate ‘0’ for DISABLED The PMD_ED ‘1’ for ENABLED 8 (energy detect) primi- 9 tive, along with the 10 PMD_SQ, provides 11 CCA status at the 12 PLCP layer through 13 the PHYCCA primi- 14 tive. PMD_ED indi- 15 cates a binary status 16 of ENABLED or 17 DISABLED. 18 PMD_ED is 19 ENABLED when the 20 RSSI indicated in 21 PMD_RSSI is greater 22 than the 23 ED_THRESHOLD 24 parameter. PMD_ED 25 26 27 28 29 18.4.5.14.3 When generated 30 31 This primitive is generated by the PHY sublayer when the PHY is receiving RF energy from any source that 32 exceeds the ED_THRESHOLD parameter. 33 34 18.4.5.14.4 Effect of receipt 35 36 This indicator is provided to the PLCP for forwarding to the MAC entity for information purposes through 37 the PMD_ED indicator. This parameter shall indicate that the RF medium may be busy with an RF energy 38 source that is not High Rate PHY compliant. If a High Rate PHY source is being received, the PMD_CS 39 function is enabled shortly after the PMD_ED function is enabled. 40 41 18.4.5.15 PMD_ED.request 42 43 18.4.5.15.1 Function 44 45 This optional primitive may be generated by the PLCP to set a set a value for the energy detect ED 46 THRESHOLD. 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 42 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.5.15.2 Semantics of the service primitive 1 2 The primitive provides the following parameters: 3 4 5 Parameter Associated primitive Value Description 6 7 PMD_ED PMD_ED.request ED_THRESHOLD ED_THRESHOLD is 8 the threshold that the 9 RSSI indicated is 10 greater than in order 11 for PMD_ED to be 12 enabled. 13 14 PMD_ED is DIS- 15 ABLED when the 16 PMD_RSSI falls 17 below the energy 18 detect threshold. 19 20 21 22 23 18.4.5.15.3 When generated 24 25 This primitive is generated by the PLCP sublayer to change or set the current High Rate PHY energy detect 26 threshold. 27 28 18.4.5.15.4 Effect of receipt 29 30 The receipt of PMD_ED immediately changes the energy detection threshold as set by the 31 ED_THRESHOLD parameter. 32 33 18.4.6 PMD operating specifications, general 34 35 The following subclauses provide general specifications for the High Rate PMD sublayer. These specifica- 36 tions apply to both the Receive and the Transmit functions and general operation of a High Rate PHY. 37 38 Wireless LANS implemented in accordance with this standard are subject to equipment certification and 39 operation requirements established by regional and national regulatory administrations. The PMD specifica- 40 tion establishes minimum technical requirements for interoperability, based upon established regulations at 41 the time this standard was issued. These regulations are subject to revision, or may be superceeded. Require- 42 ments that are subject to local geographic regulations are annotated within the PMD specification. Regula- 43 tory requirements that do not effect interoperability are not addressed in this standard. Implementers are 44 refered to the following regulatory sources for further information. Operation in countries within defined 45 regulatory domains may be subject to additional regulations. 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 43 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 The documents listed in 14.6.2 and below specify the current regulatory requirements for various geographic 1 areas at the time the standard was developed. They are provided for geographic information only, and are 2 subject to change or revision at any time. 3 4 Table —Additional Regulatory requirement list 5 6 Geographic area Approval standards Documents Approval authority 7 8 Japan Ministry of Public MPHPT Ordinance MPHPT 9 management, Home for regulating Radio 10 affairs, Post and Tele- Equipment, Article 11 communication 49-20 (MPHPT) 12 13 14 15 16 17 18.4.6.1 Operating frequency range 18 19 The High Rate PHY shall operate in the frequency range of 2.4 GHz to 2.4835 GHz as allocated by regula- 20 21 tory bodies in the USA, Europe, and Japan or in the 2.471 GHz to 2.497 GHz frequency band as allocated by 22 regulatory authority in Japan. 23 24 18.4.6.2 Number of operating channels 25 26 27 The channel center frequencies and CHNL_ID numbers shall be as shown in Table 9. The FCC (US), IC 28 (Canada), MPHPT (Japan), and ETSI (Europe) specify operation from 2.4 GHz to 2.4835 GHz. For Japan, 29 operation is aditionally specified as 2.471 GHz to 2.497 GHz. France allows operation from 2.4465 GHz to 30 2.4835 GHz, and Spain allows operation from 2.445 GHz to 2.475 GHz. For each supported regulatory 31 domain, all channels in Table 9 marked with “X” shall be supported. 32 33 34 Table 9—High Rate PHY Frequency Channel Plan 35 36 37 Regulatory domains 38 39 X'10' X'20' X'30' X'31' X'32' X'40' X'41' CHNL_ID Frequency FCC IC ETSI Spain France Japan Japan 40 41 1 2412 MHz X X X — — — X 42 43 2 2417 MHz X X X — — — X 44 3 2422 MHz X X X — — — X 45 46 4 2427 MHz X X X — — — X 47 5 2432 MHz X X X — — — X 48 49 6 2437 MHz X X X — — — X 50 7 2442 MHz X X X — — — X 51 52 8 2447 MHz X X X — — — X 53 9 2452 MHz X X X — — — X 54 55 Copyright © 2001 IEEE. All rights reserved . 44 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table 9—High Rate PHY Frequency Channel Plan 1 2 10 2457 MHz X X X X X — X 3 4 11 2462 MHz X X X X X — X 5 12 2467 MHz — — X — X — X 6 7 13 2472 MHz — — X — X — X 8 14 2484 MHz — — — — — X 9 10 11 In a multiple cell network topology, overlapping and/or adjacent cells using different channels can operate 12 simultaneously without interference if the distance between the center frequencies is at least 25 MHz. Chan- 13 nel 14 shall be designated specifically for operation in Japan. 14 15 18.4.6.3 Modulation and channel data rates 16 17 Four modulation formats and data rates are specified for the High Rate PHY. The basic access rate shall be 18 based on 1 Mbit/s DBPSK modulation. The enhanced access rate shall be based on 2 Mbit/s DQPSK. The 19 extended Direct Sequence specification defines two additional data rates. The high rate access rates shall be 20 based on the Complementary Code Keying (CCK) modulation scheme for 5.5 Mbit/s and 11 Mbit/s. An 21 optional Packet Binary Convolutional Coding (PBCC) mode is also provided for potentially enhanced per- 22 formance. 23 24 18.4.6.4 Spreading sequence and modulation for 1 and 2 Mbit/s 25 26 The following 11-chip Barker sequence shall be used as the PN code sequence for the 1 and 2 Mbit/s modu- 27 lation: 28 29 +1, –1, +1, +1, –1, +1, +1, +1, –1, –1, –1 30 31 The leftmost chip shall be output first in time. The first chip shall be aligned at the start of a transmitted sym- 32 bol. The symbol duration shall be exactly 11 chips long. 33 34 The DBPSK encoder for the basic access rate is specified in Table 10. The DQPSK encoder is specified in 35 Table 11. (In the tables, +jω shall be defined as counterclockwise rotation.) 36 37 38 Table 10—1 Mbit/s DBPSK Encoding Table 39 40 41 Bit input Phase change (+jω) 42 0 0 43 44 1 π 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 45 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table 11—2 Mbit/s DQPSK Encoding Table 1 2 3 Dibit pattern (d0,d1) Phase change (+jω) 4 d0 is first in time 5 00 0 6 7 01 π/2 8 11 π 9 10 10 3π/2 (–π/2) 11 12 13 18.4.6.5 Spreading Sequences and modulation for CCK modulation at 5.5 and 11 Mbit/s 14 15 16 17 18 For the CCK modulation modes, the spreading code length is 8 and is based on complementary codes. The 19 chipping rate is 11 Mchip/s. The symbol duration shall be exactly 8 complex chips long. 20 21 The following formula shall be used to derive the CCK code words that shall be used for spreading both 5.5 22 and 11 Mbit/s: 23 24 25 26 27 c = {e j(ϕ1 +ϕ2 +ϕ3 +ϕ4 ), e j(ϕ1 +ϕ3 +ϕ4 ) , e j(ϕ1 +ϕ2 +ϕ4 ), 28 29 −e j(ϕ1 +ϕ4 ), e j(ϕ1 +ϕ2 +ϕ3) , e j(ϕ1 +ϕ3 ), −e j(ϕ1 +ϕ2 ) , e jϕ1 } 30 31 32 33 34 , where C is the code word 35 36 37 C ={ c0 .. c7} 38 39 The terms: ϕ1, ϕ2, ϕ3, and ϕ4 are defined in subclause 18.4.6.5.2 for 5.5 Mbit/s and subclause 18.4.6.5.3 for 40 11Mbit/s. 41 42 43 This formula creates 8 complex chips (c0 to c7) where c0 is transmitted first in time. 44 45 This is a form of the generalized Hadamard transform encoding where ϕ1 is added to all code chips, ϕ2 is 46 added to all odd code chips, ϕ3 is added to all odd pairs of code chips and ϕ4 is added to all odd quads of 47 code chips. 48 49 50 The phases ϕ1 modify the phase of all code chips of the sequence and shall be DQPSK encoded for 5.5 and 51 11 Mbit/s. This shall take the form of rotating the whole symbol by the appropriate amount relative to the 52 phase of the preceding symbol. Note that the chip c7 of the symbol defined above is the chip that indicates 53 the symbol’s phase and it is transmitted last. 54 55 Copyright © 2001 IEEE. All rights reserved . 46 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.6.5.1 Codes for CCK 1 2 3 The 4th and 7th chips are rotated 180 degrees (as shown) which helps to optimize the sequence correlation 4 properties and minimize DC offsets in the codes. This can be seen by the minus sign on the 4th and 7th terms 5 in the equation in subclause 18.4.6.5. 6 7 18.4.6.5.2 CCK 5.5 Mbit/s Modulation 8 9 10 At 5.5 Mbit/s 4 bits (d0 to d3; d0 first in time) are transmitted per symbol. 11 12 The data bits d0 and d1 encode ϕ1 based on DQPSK. The DQPSK encoder is specified in Table 12. (In the 13 tables, +jω shall be defined as counterclockwise rotation.). The phase change for ϕ1 is relative to the phase 14 ϕ1 of the preceding symbol. For the header to PSDU transition, the phase change for ϕ1 is relative to the 15 16 phase of the preceding DQPSK (2 Mbit/s) symbol. That is, the phase of the last symbol of the CRC-16 is the 17 reference phase for the first symbol generated from the PSDU octets. See the definition in subclause 18.4.6.4 18 for the reference phase of this Barker coded symbol. A “+1” chip in the Barker code shall represent the same 19 carrier phase as a “+1” chip in the CCK code. 20 21 All odd numbered symbols generated from the PSDU octets shall be given an extra 180 degree (π) rotation 22 in addition to the standard DQPSK modulation as shown in Table 12. The symbols of the PSDU shall be 23 24 numbered starting with “0” for the first symbol for the purposes of determining odd and even symbols. That 25 is, the PSDU transmission starts on an even numbered symbol. 26 27 Table 12. DQPSK Encoding Table 28 29 30 Dibit pattern (d(0),d(1)) Even Symbols Odd Symbols 31 d(0) is first in time Phase Change (+jω) Phase Change (+j ω) 32 33 00 0 π 34 01 π/2 3π/2 (- π/2) 35 36 11 π 0 37 10 3π/2 (-π /2) π/2 38 39 40 41 The data dibits d2, and d3 CCK encode the basic symbol as specified in Table 13. This table is derived from 42 the formula above by setting ϕ2 = (d2*π) + π /2, ϕ3 = 0, and ϕ4 = d3*π. In the table d2 and d3 are in the 43 order shown and the complex chips are shown c0 to c7 (left to right) with c0 transmitted first in time. 44 45 46 Table 13. 5.5 Mbit/s CCK Encoding Table 47 48 d2, d3 c1 c2 c3 c4 c5 c6 c7 c8 49 00 1j 1 1j -1 1j 1 -1j 1 50 51 01 -1j -1 -1j 1 1j 1 -1j 1 52 10 -1j 1 -1j -1 -1j 1 1j 1 53 11 1j -1 1j 1 -1j 1 1j 1 54 55 Copyright © 2001 IEEE. All rights reserved . 47 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.6.5.3 CCK 11 Mbit/s modulation. 1 2 At 11 Mbit/s, 8 bits (d0 to d7; d0 first in time) are transmitted per symbol. 3 4 5 The first dibit (d0,d1) encodes ϕ1 based on DQPSK. The DQPSK encoder is specified in Table 12 above. 6 The phase change for ϕ1 is relative to the phase ϕ1 of the preceding symbol. In the case of header to PSDU 7 transition, the phase change for ϕ1 is relative to the phase of the preceding DQPSK symbol. All odd num- 8 bered symbols of the PSDU are given an extra 180 degree (π) rotation in accordance with the DQPSK mod- 9 ulation as shown in Table 12. Symbol numbering starts with “0” for the first symbol of the PSDU. 10 11 The data dibits: (d2,d3), (d4,d5), (d6,d7) encode ϕ2, ϕ3, and ϕ4 respectively based on QPSK as specified in 12 Table 14. Note that this table is binary, not Grey, coded. 13 14 15 Table 14. QPSK Encoding Table 16 17 18 Dibit pattern (d(i),d(i+1)) Phase d(i) is first in time 19 20 00 0 21 22 01 π/2 23 10 π 24 25 11 3π/2 (-π /2) 26 27 28 18.4.6.6 DSSS/PBCC Data Modulation and Modulation Rate (Optional) 29 30 31 This optional coding scheme uses a binary convolutional coding with a 64-state binary convolutional code 32 (BCC) and a cover sequence. The output of the BCC is encoded jointly onto the I and Q channels, as further 33 documented below. 34 35 The encoder for this scheme is shown in Figure 12. Incoming data is first encoded with a binary convolu- 36 tional code. A cover code is applied to the encoded data prior to transmission through the channel. 37 38 39 40 SCRAMBLED (y 1 y 0) 41 DATA IN BCC QPSK QPSK SIGNAL 42 RATE 1/2 COVER M 43 ENCODER C MAP I,Q 44 45 46 47 48 COVER S 49 CODE 50 COVER SEQUENCE 51 52 Figure 12. PBCC Modulator Scheme 53 54 55 Copyright © 2001 IEEE. All rights reserved . 48 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 The binary convolutional code that is used is a 64-state, rate ½ code. The generator matrix for the code is 1 given as: 2 3 4 5 6 G = [ D 6 + D 4 + D 3 + D + 1, D 6 + D 5 + D 4 + D 3 + D 2 + 1] 7 8 9 10 or in octal notation, it is given by 11 12 G = [133, 175] 13 14 15 Since the system is frame (PPDU) based, the encoder shall be in state zero, i.e. all memory elements contain 16 zero, at the beginning of each PPDU. The encoder must also be placed in a known state at the end of each 17 PPDU to prevent the data bits near the end of the PPDU from being substantially less reliable than those 18 early on in the PPDU. To place the encoder in a known state at the end of a PPDU, at least six deterministic 19 bits must be input immediately following the last data bit input the convolutional encoder. This is achieved 20 by appending one octet containing all zeros to the end of the PPDU prior to transmission and discarding the 21 final octet of each received PPDU. In this manner, the decoding process can be completed on the last data 22 bits reliably. 23 24 An encoder block diagram is shown in Figure 13. It consists of six memory elements. For every data bit 25 input, two output bits are generated. 26 27 28 29 + + + + y0 30 input 31 x 32 Z-1 Z -1 Z -1 Z -1 Z -1 Z-1 outputs 33 34 + + + + + y1 35 36 37 Figure 13. PBCC Convolutional Encoder 38 39 40 The output of the binary convolutional code described in above is mapped to a constellation using one of 41 two possible rates. The 5.5 Mbps rate uses BPSK and the 11 Mbps rate uses QPSK. In QPSK mode each pair 42 of output bits from the binary convolutional code is used to produce one symbol, while in BPSK mode each 43 pair of bits from the BCC is taken serially (y0 first) and used to produce two BPSK symbols. This yields a 44 throughput of one bit per symbol in QPSK mode and one-half a bit per symbol in BPSK mode. 45 46 The phase of the first complex chip of the PSDU shall be defined with respect to the phase of the last chip of 47 the PCLP header, i.e. the last chip of the CRC check. The bits (y1 y0 ) = (0,0) shall indicate the same phase 48 as the last chip of the CRC check. The other three combinations of (y1 y 0) shall be defined with respect to 49 this reference phase as shown in Figure 14. 50 51 The mapping from BCC outputs to PSK constellation points in BPSK and QPSK modes is determined by a 52 pseudo-random cover sequence. This is shown for both modes in Figure 14. Note that this is an absolute 53 phase table, not differential as in CCK. 54 55 Copyright © 2001 IEEE. All rights reserved . 49 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 S=0 S=1 3 4 (y 1 y0) 01 00 00 10 5 QPSK MODE 6 (1 BIT PER SYMBOL) 7 8 11 10 01 11 9 10 11 12 S=0 S=1 13 0 0 14 15 BPSK MODE 16 (1/2 BIT PER SYMBOL) 17 1 1 18 19 20 Figure 14. Cover Code Mapping 21 22 23 The pseudo-random cover sequence is generated from a seed sequence. The 16-bit seed sequence is 24 0011001110001011, where the first bit of the sequence in time is the left most bit. This sequence in octal 25 notation is given as 150714, where the least significant bit is the first in time. This seed sequence is used to 26 generate the pseudo-random cover sequence of length 256 bits that is used in the mapping of the current 27 PSK symbol. It is the current binary value of this sequence at every given point in time that is taken as s in 28 Figure 14. 29 30 This sequence of 256 bits is produced by taking the first sixteen bits of the sequence as the seed sequence, 31 the second sixteen bits as the seed sequence cyclically left rotated by three, the third sixteen bits as the seed 32 sequence cyclically left rotated by six, etc. If ci is the ith bit of the seed sequence, where 0 <= I <= 15, then 33 the sequence that is used to cover the data is given row-wise as follows: 34 35 36 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 37 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 38 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 39 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 40 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 41 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 42 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 43 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 44 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 45 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 46 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 47 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 48 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 49 c7 c8 c9 c10 c11 c12 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 50 c10 c11 c12c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 51 c13 c14 c15 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 52 53 For PPDUs with more than 256 data bits this sequence of 256 bits is simply repeated. 54 55 Copyright © 2001 IEEE. All rights reserved . 50 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.6.7 Channel Agility (Optional) 1 2 This channel agility option allows an implementation to overcome some inherent difficulty with static chan- 3 nel assignements (a tone jammer), without burdening all implementations with the added cost of this capa- 4 bility. When the channel agility option is enabled the PHY shall meet the requirements on channel switching 5 and settling time as described in subclause 18.4.6.12. and the hop sequences described below. This option 6 can also be used to implement 802.11 compliant systems that are interoperable between both FH and DS 7 modulations. Annex F contains a description of the expected behavior when such networks are employed. 8 9 18.4.6.7.1 Hop Sequences 10 11 The hop sequences for each of the specified geographical areas are defined with two sets. High Rate fre- 12 quency channels referred to in this subclause are defined in Table 9. 13 14 The first set (Figure 15 and Figure 17) uses non-overlapping frequency channels to allow the High Rate sys- 15 tems to minimize interference degradation. The synchronization of frequency hopping is performed by the 16 MAC sub-layer management entity as defined in the IEEE 802.11 Standard, 1999, subclause 11.1.5 for the 17 FH PHY. The PLME SAP service primitives to command a new frequency channel is as defined in the IEEE 18 802.11 Standard, 1999, subclause 10.4. 19 20 The second set (Figure 16 and Figure 18) uses half overlapping frequency channels with 10 MHz center fre- 21 quency spacing to enable interoperability with 1 and 2 Mbit/s FH systems hopping with the approved 22 802.11 hop sequences. The High Rate hop frequency is calculated from the specific 1 MHz channel chosen 23 for a given hop by picking the closest High Rate channel within the set. Where there is a choice of two DSSS 24 channels, the lower one shall be the one chosen. Therefore, the chosen channel shall be no more than +/-5 25 MHz of the channel center of the FH channel. When operating on the FH channels beyond +/-5 MHz of the 26 closest High Rate channel specified in the set, the High Rate mode shall not be used and all FH transmis- 27 sions shall occur at the 1 or 2 Mbit/s rates. 28 29 18.4.6.7.2 Operating channels 30 31 The operating channels for specified geographical areas are defined in Table 15 and Table 16. 32 33 34 35 36 Table 15. North American Operating Channels 37 38 HR/DSSS Channel 39 Set Number of Channels 40 Numbers 41 1 3 1, 6, 11 42 2 6 1, 3, 5, 7, 9, 11 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 51 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 CHANNEL 1 CHANNEL 6 CHANNEL11 3 4 5 6 2400 MHz 2412 MHz 2437 MHz 2462 MHz 2483.5 MHz 7 8 Figure 15. North American Channel Selection - Non overlapping 9 10 11 12 13 14 15 16 17 2400 MHz 2412 MHz 2422 MHz 2432 MHz 2442 MHz 2452 MHz 2462 MHz 2472 MHz 2483.5 MHz 18 19 Figure 16. North American Channel Selection - Overlapping 20 21 22 23 24 25 26 Table 16. Europe Operating Channels (except France and Spain) 27 28 Set Number of Channels HR/DSS Channel Numbers 29 30 1 3 1, 7, 13 31 2 7 1, 3, 5, 7, 9, 11, 13 32 33 34 35 36 37 38 CHANNEL 1 CHANNEL 7 CHANNEL13 39 40 41 42 2400 MHz 2412 MHz 2442 MHz 2472 MHz 2483.5 MHz 43 44 Figure 17. European Channel Selection - Non overlapping 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 52 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 6 2400 MHz 2412 MHz 2422 MHz 2432 MHz 2442 MHz 2452 MHz 2462 MHz 2472 MHz 2483.5 MHz 7 Figure 18. European Channel Selection - Overlapping 8 9 10 18.4.6.7.3 Hop Patterns 11 12 A frequency hopping pattern, Fx, consists of a permutation of all frequency channels defined in Table 15, 13 and Table 16. For a given pattern number, x, the hopping sequence can be written as: 14 15 Fx = {fx (1), fx (2),...fx (p)} 16 17 where, 18 19 fx (i) = channel number (as defined in subclause14.6.4) for ith frequency in xth hopping pattern 20 21 p = number of hops in pseudo-random hopping pattern before repeating sequence (79 for North America and 22 most of Europe) 23 24 25 26 The frequency hopping patterns for Set 1 of each geographic area is based on the Hop Patterns in Table 17 27 and Table 18. 28 29 30 The frequency hopping patterns for Set 2 of each geographic area is defined by the 1/2 Mbit/s FH PHY hop 31 sequences as described in the FH PHY subclause 14.6.8. Given the hopping pattern number, x, and the index 32 for the next frequency, i (in the range 1 to p), the DS channel number as defined in subclause 18.4.6.2 shall 33 be selected with the following algorithm: 34 35 36 37 North America: 38 39 40 41 f'x (i) = f'’x (i) for 1 <= f'’x (i) <= 11; 42 43 f'x (i) = null for f'’x (i) < 1 and f'’x (i) > 11; 44 45 f'’x (i) = 2 * Int [({[b(i) + x] mod (79) +2} – 6) / 10] – 1 46 47 with b(i) defined in Table 42 of subclause 14.6.8, 48 49 Most of Europe: 50 51 52 53 f'x (i) = f'’x (i) for 1 <= f'’x (i) <= 13; 54 55 Copyright © 2001 IEEE. All rights reserved . 53 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 f'x (i) = null for f'’x (i) < 1 and f'’x (i) > 13; 1 2 f'’x (i) = 2 * Int [({[b(i) + x] mod (79) +2} – 6) / 10] – 1 3 4 with b(i) defined in Table 42 of subclause 14.6.8, 5 6 7 8 9 Table 17. North America Set 1 Hop Patterns 10 11 Index Pattern 1 Pattern 2 12 13 1 1 1 14 2 6 11 15 16 3 11 6 17 18 19 20 21 22 23 24 Table 18. Europe Set 1 Hop Patterns (except France and Spain) 25 26 Index Pattern 1 Pattern 2 27 28 1 1 1 29 2 7 13 30 31 3 13 7 32 33 34 35 36 37 38 18.4.6.8 Transmit and receive in-band and out-of-band spurious emissions 39 40 The High Rate PHY conforms with in-band and out-of-band spurious emissions as set by regulatory bodies. 41 For the USA, refer to FCC 15.247, 15.205, and 15.209. For Europe, refer to ETS 300–328. For Japan refer to 42 MPT ordinance for Regulating Radio Equipment, Article 7. 43 44 18.4.6.9 Transmit-to-receive turnaround time 45 46 The TX-to-RX turnaround time shall be less than 10 µs, including the power-down ramp specified in 47 18.4.7.6. 48 49 The TX-to-RX turnaround time shall be measured at the air interface from the trailing edge of the last trans- 50 mitted symbol to valid CCA detection of the incoming signal. The CCA should occur within 25 µs (10 µs 51 for turnaround time plus 15 µs for energy detect) or by the next slot boundary occurring after the 25 µs has 52 elapsed (refer to 18.4.8.4). A receiver input signal 3 dB above the ED threshold described in 18.4.8.4 shall 53 be present at the receiver. 54 55 Copyright © 2001 IEEE. All rights reserved . 54 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.6.10 Receive-to-transmit turnaround time 1 2 3 The RX-to-TX turnaround time shall be measured at the MAC/PHY interface, using PHYTX- 4 START.request and shall be 5 µs. This includes the transmit power up ramp described in 18.4.7.6. 5 6 18.4.6.11 Slot time 7 8 9 The slot time for the High Rate PHY shall be the sum of the RX-to-TX turnaround time (5 µs) and the 10 energy detect time (15 µs specified in 18.4.8.4). The propagation delay shall be regarded as being included 11 in the energy detect time. 12 13 18.4.6.12 Channel switching/settling time 14 15 When the channel agility option is enabled, the time to change from one operating channel frequency to 16 another as specified in 18.4.6.2 is 224 µs. A conformant PMD meets this switching time specification when 17 the operating channel center frequency has settled to within +/- 60 kHz of the nominal channel center. Sta- 18 tions shall not transmit until after the channel change settling time. 19 20 21 18.4.6.13 Transmit and receive antenna port impedance 22 23 The impedance of the transmit and receive antenna port(s) shall be 50 Ω if the port is exposed. 24 25 26 18.4.6.14 Transmit and receive operating temperature range 27 28 Three temperature ranges for full operation compliance to the High Rate PHY are specified in Clause 13. Type 29 1 shall be defined as 0 oC to 40 oC, and is designated for office environments. Type 2 shall be defined as –30 oC 30 to +70oC, and is designated for industrial environments. 31 32 33 18.4.7 PMD transmit specifications 34 35 The following subclauses describe the transmit functions and parameters associated with the PMD sublayer. 36 37 38 18.4.7.1 Transmit power levels 39 40 The maximum allowable output power as measured in accordance with practices specified by the regulatory 41 bodies is shown in Table 19. In the USA, the radiated emissions should also conform with the ANSI uncon- 42 trolled radiation emission standards (IEEE Std C95.1-1991). 43 44 45 Table 19—Transmit Power Levels 46 47 48 Maximum output power Geographic location Compliance document 49 1000 mW USA FCC 15.247 50 51 100 mW (EIRP) Europe ETS 300–328 52 See Table 115a Japan MPT ordinance for Regulating Radio 53 Equipment, Article 49-20 54 55 Copyright © 2001 IEEE. All rights reserved . 55 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Table 115a, Transmit power levels in Japan 1 2 3 4 5 Maximum output power Modulation/Frequency range Compliance document 6 7 10 mW/MHz for FH-SS or DS-SS modulation MPHPT ordinance for Regulating 8 and operation in 2.471 GHz - Radio Equipment, article 49-20 9 2.497 GHz 10 11 10 mW/MHz for DS-SS modulation and opera- MPHPT ordinance for Regulating 12 tion in 2.400GHz - 2.4835 GHz Radio Equipment, article 49-20 13 3 mW/MHz for FH-SS modulation and opera- MPHPT ordinance for Regulating 14 tion in 2.400 GHz - 2.4835 GHz Radio Equipment, article 49-20 15 16 17 18 18.4.7.2 Transmit power level control 19 20 21 Power control shall be provided for transmitted power greater than 100 mW. A maximum of four power lev- 22 els may be provided. At a minimum, a radio capable of transmission greater than 100 mW shall be capable 23 of switching power back to 100 mW or less. 24 25 18.4.7.3 Transmit spectrum mask 26 27 28 The transmitted spectral products shall be less than –30 dBr (dB relative to the SINx/x peak) for fc – 22 MHz 29 < f < fc –11 MHz, fc +11 MHz < f < fc + 22 MHz, –50 dBr for f < fc –22 MHz, and f > fc + 22 MHz, where fc 30 is the channel center frequency. The transmit spectral mask is shown in Figure 19. The measurements shall 31 be made using 100 kHz resolution bandwidth and a 100 kHz video bandwidth. 32 Transmit 33 Unfiltered Spectrum 34 Sinx/x Mask 0 dBr 35 36 37 38 39 40 -30 dBr 41 42 43 44 -50 dBr 45 fc 46 fc -22 MHz fc -11 MHz fc +11 MHz fc +22 Mhz 47 Figure 19—Transmit spectrum mask 48 49 50 51 18.4.7.4 Transmit center frequency tolerance 52 53 The transmitted center frequency tolerance shall be ±25 ppm maximum. 54 55 Copyright © 2001 IEEE. All rights reserved . 56 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.7.5 Chip clock frequency tolerance 1 2 3 The PN code chip clock frequency tolerance shall be better than ±25 ppm maximum. It is highly recom- 4 mended that the chip clock and the transmit frequency be locked (coupled) for optimum demodulation per- 5 formance. If these clocks are locked, it is recommended that bit 2 of the SERVICE field be set to a 1 as 6 indicated in paragraph 18.2.3.4. 7 8 18.4.7.6 Transmit power-on and power-down ramp 9 10 11 The transmit power-on ramp for 10% to 90% of maximum power shall be no greater than 2 µs. The transmit 12 power-on ramp is shown in Figure 20. 13 14 15 Max Tx power 16 17 Transmit 18 Power 90% MAX 19 20 Output 21 22 23 24 25 10% MAX 26 0 1 2 3 4 Time µsec 27 28 Figure 20—Transmit Power-On Ramp 29 30 31 The transmit power-down ramp for 90% to 10% maximum power shall be no greater than 2 µs. The transmit 32 power down ramp is shown in Figure 21. 33 34 35 36 Max Tx power 37 38 Transmit 90% MAX 39 Power 40 Output 41 42 43 44 45 10% MAX 46 47 0 1 2 3 4 Time µsec 48 Figure 21—Transmit Power-Down Ramp 49 50 51 52 The transmit power ramps shall be constructed such that the High Rate PHY emissions conform with spuri- 53 ous frequency product specification defined in 18.4.6.8. 54 55 Copyright © 2001 IEEE. All rights reserved . 57 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.7.7 RF carrier suppression 1 2 The RF carrier suppression, measured at the channel center frequency, shall be at least 15 dB below the peak 3 SIN(x)/x power spectrum. The RF carrier suppression shall be measured while transmitting a repetitive 01 4 data sequence with the scrambler disabled using DQPSK modulation. A 100 kHz resolution bandwidth shall 5 be used to perform this measurement. 6 7 18.4.7.8 Transmit modulation accuracy 8 9 The transmit modulation accuracy requirement for the High Rate PHY shall be based on the difference 10 between the actual transmitted waveform and the ideal signal waveform. Modulation accuracy shall be deter- 11 mined by measuring the peak vector error magnitude measured during each chip period. Worst-Case vector 12 error magnitude shall not exceeded 0.35 for the normalized sampled chip data. The ideal complex I and Q con- 13 stellation points associated with DQPSK modulation (0.707,0.707), (0.707, –0.707), (–0.707, 0.707), (–0.707, 14 –0.707) shall be used as the reference. These measurements shall be from baseband I and Q sampled data after 15 recovery through a reference receiver system. 16 17 Figure 22 illustrates the ideal DQPSK constellation points and range of worst-case error specified for modu- 18 lation accuracy. 19 20 Ideal Constellation 21 Q Point 22 23 24 25 26 Range of 27 Worst Case Error 28 I 29 30 Measured Point 31 32 33 34 35 Error Vector 36 37 38 39 Figure 22—Modulation Accuracy Measurement Example 40 41 Error vector measurement requires a reference receiver capable of carrier lock. All measurements shall be 42 made under carrier lock conditions. The distortion induced in the constellation by the reference receiver 43 shall be calibrated and measured. The test data error vectors described below shall be corrected to compen- 44 sate for the reference receiver distortion. 45 46 The IEEE 802.11 compatible radio shall provide an exposed TX chip clock, which shall be used to sample 47 the I and Q outputs of the reference receiver. 48 49 The measurement shall be made under the conditions of continuous DQPSK transmission using scrambled 50 all 1’s. 51 52 The eye pattern of the I channel shall be used to determine the I and Q sampling point. The chip clock pro- 53 vided by the vendor radio shall be time delayed such that the samples fall at a 1/2 chip period offset from the 54 55 Copyright © 2001 IEEE. All rights reserved . 58 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 mean of the zero crossing positions of the eye (see Figure 23). This is the ideal center of the eye and may not 1 be the point of maximum eye opening. 2 3 4 1 Chip Period 5 6 7 8 9 Amplitude 10 Geometric 11 Center 12 13 14 15 16 Time 17 Ideal Sample 1/2 Chip Period Point 18 Vendor 19 Chip Clock 20 21 22 23 Figure 23—Chip Clock Alignment with Baseband Eye Pattern 24 25 26 27 Using the aligned chip clock, 1000 samples of the I and Q baseband outputs from the reference receiver are 28 captured. The vector error magnitudes shall be calculated as follows: 29 30 Calculate the dc offsets for I and Q samples. 31 32 33 34 999 35 I mean = ∑ I (n ) ⁄ 1000 36 n=0 37 38 39 40 999 41 Q mean = ∑ Q ( n ) ⁄ 1000 42 n=0 43 44 45 Calculate the dc corrected I and Q samples for all n =1000 sample pairs. 46 47 48 I dc (n)= I(n) – Imean 49 50 Q dc (n)= Q(n) – Q mean 51 52 53 Calculate the average magnitude of I and Q samples. 54 55 Copyright © 2001 IEEE. All rights reserved . 59 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 999 2 I mag = ∑ I dc( n ) ⁄ 1000 3 n=0 4 5 6 999 7 Q mag = ∑ Q dc ( n ) ⁄ 1000 8 n= 0 9 10 11 Calculate the normalized error vector magnitude for the I dc (n)/Q dc (n) pairs. 12 13 1- 14 2 Verr ( n ) = 1-- × ( { I dc( n ) – I mag } + { Q dc( n ) – Q mag} ) 15 2 2 – V correction 2 16 17 with V correction = error induced by the reference receiver system. 18 19 20 A vendor High Rate PHY implementation shall be compliant if for all n =1000 samples the following condi- 21 tion is met: 22 23 Verr(n) < 0.35 24 25 18.4.8 PMD receiver specifications 26 27 The following subclauses describe the receive functions and parameters associated with the PMD sublayer. 28 29 18.4.8.1 Receiver minimum input level sensitivity 30 31 The frame error ratio (FER) shall be less than 8 ×10 –2 at an PSDU length of 1024 octets for an input level of – 32 76 dBm measured at the antenna connector. This FER shall be specified for 11 Mbit/s CCK modulation. The 33 test for the minimum input level sensitivity shall be conducted with the energy detection threshold set less than 34 or equal to –76 dBm. 35 36 18.4.8.2 Receiver maximum input level 37 38 The receiver shall provide a maximum FER of 8 ×10 –2 at an PSDU length of 1024 octets for a maximum input 39 level of –10 dBm measured at the antenna. This FER shall be specified for 11 Mbit/s CCK modulation. 40 41 18.4.8.3 Receiver adjacent channel rejection 42 43 Adjacent channel rejection is defined between any two channels with >25 MHz separation in each channel 44 group defined in 18.4.6.2. 45 46 The adjacent channel rejection shall be equal to or better than 35 dB with an FER of 8×10 –2 using 47 1 1 Mbit /s CCK modulation described in 18.4.6.3 and an PSDU length of 1024 octets. 48 49 The adjacent channel rejection shall be measured using the following method: 50 51 Input a 11 Mbit/s CCK modulated signal at a level 6 dB greater than specified in 18.4.8.1. In an adjacent 52 channel (>25 MHz separation as defined by the channel numbering), input a signal modulated in a similar 53 fashion that adheres to the transmit mask specified in 18.4.7.3 to a level 41 dB above the level specified in 54 55 Copyright © 2001 IEEE. All rights reserved . 60 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 18.4.8.1. The adjacent channel signal shall be derived from a separate signal source. It cannot be a frequency 1 shifted version of the reference channel. Under these conditions, the FER shall be no worse than 8 × 10 –2 . 2 3 18.4.8.4 CCA 4 5 The High Rate PHY shall provide the capability to perform CCA according to at least one of the following 6 three methods: 7 8 a) CCA Mode 1: Energy above threshold. CCA shall report a busy medium upon detecting any energy 9 above the ED threshold. 10 b) CCA Mode 4: Carrier Sense with timer. CCA shall start a timer whose duration is 3.65 ms and 11 report a busy medium only upon the detection of a High Rate PHY signal. CCA shall report an idle 12 medium after the timer expires and no High Rate PHY signal is detected. The 3.65 ms timeout is the 13 duration of the longest possible 5.5 Mbit/s PSDU. 14 c) CCA Mode 5: A combination of Carrier Sense and energy above threshold. CCA shall report busy at 15 least while a High Rate PPDU with energy above the ED threshold is being received at the antenna. 16 17 The energy detection status shall be given by the PMD primitive, PMD_ED. The carrier sense status shall be 18 given by PMD_CS. The status of PMD_ED and PMD_CS is used in the PLCP convergence procedure to 19 indicate activity to the MAC through the PHY interface primitive PHY-CCA.indicate. 20 21 A busy channel shall be indicated by PHY-CCA.indicate of class BUSY. 22 23 Clear channel shall be indicated by PHY-CCA.indicate of class IDLE. 24 25 The PHY MIB attribute dot11CCAModeSupported shall indicate the appropriate operation modes. The 26 PHY shall be configured through the PHY MIB attribute dot11CurrentCCAMode. 27 28 The CCA shall be TRUE if there is no energy detect or carrier sense. The CCA parameters are subject to the 29 following criteria: 30 31 a) If a valid High Rate signal is detected during its preamble within the CCA assessment window, the 32 energy detection threshold shall be less than or equal to –76 dBm for TX power > 100 mW, –73 33 dBm for 50 mW < TX power < 100 mW, and –70 dBm for TX power < 50 mW. 34 b) With a valid signal (according to the CCA mode of operation) present at the receiver antenna within 35 5 µs of the start of a MAC slot boundary, the CCA indicator shall report channel busy before the end 36 of the slot time. This implies that the CCA signal is available as an exposed test point. Refer to IEEE 37 Std 802.11- 1999 Figure 47 for a slot time boundary definition. 38 c) In the event that a correct PLCP Header is received, the High Rate PHY shall hold the CCA signal 39 inactive (channel busy) for the full duration as indicated by the PLCP LENGTH field. Should a loss 40 of carrier sense occur in the middle of reception, the CCA shall indicate a busy medium for the 41 intended duration of the transmitted PPDU. Upon reception of a correct PLCP Header, the timer of 42 CCA Mode 2 shall be overridden by this requirement. 43 44 Conformance to High Rate PHY CCA shall be demonstrated by applying an equivalent High Rate compliant 45 signal, above the appropriate ED threshold (a), such that all conditions described in b) and c) above are dem- 46 onstrated. 47 48 Annex A Protocol Implementation Conformance Statement (PICS) Proforma (normative) 49 50 Add the following table to Annex A: 51 52 A.4.3 - IUT Configuration 53 54 55 Copyright © 2001 IEEE. All rights reserved . 61 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Insert an entry CF7 to the table 1 Item IUT Configuration References Status Support 2 What is the configuration of the IUT? 3 * CF1 Access Point (AP) 5.2 O.1 Yes o No o 4 * CF2 Independent Station (NOT an AP) 5.2 O.1 Yes o No o 5 * CF3 Frequency Hopping Spread Spectrum PHY O.2 Yes o No o 6 Layer for the 2.4GHz Band * CF4 Direct Sequence Spread Spectrum PHY O.2 Yes o No o 7 Layer for the 2.4GHz Band 8 * CF5 Infrared PHY Layer O.2 Yes o No o 9 * CF7 High Speed PHY layer O.2 Yes o No o 10 11 12 Insert a new section 4.9 for the optional HR/DSSS parameters. 13 14 A 4.9 - High Rate Direct Sequence Physical Layer Functions 15 16 Are the following PHY features supported? 17 Item PHY Feature References Status Support 18 HRDS1 Long Preamble and Header Proce- 18.2 M Yes o No o 19 dures 20 HRDS1.1 Long DS Preamble prepended on 18.2.1 M Yes o No o 21 TX 22 HRDS1.2 Long PLCP integrity check genera- 18.2.3, 18.2.3.6 M Yes o No o 23 tion 24 HRDS1.3 TX Rate change capability 18.2.3.3 M Yes o No o 25 HRDS1.4 Supported Data Rates 18.1, 18.2.3.3 M Yes o No o 26 HRDS1.5 Data scrambler 18.2.4 M Yes o No o 27 HRDS1.6 Scrambler initialization 18.2.4 M Yes o No o 28 *HRDS2 Channel Agility Option 18.3.2 O Yes o No o 29 *HRDS3 Short Preamble and Header Proce- 18.2 O Yes o No o 30 dures 31 HRDS3.1 Short Preamble prepended on TX 18.2.2 HRDS3: Yes o No o N/A o 32 M 33 HRDS3.2 Short Header Transmission 18.2.3.8, HRDS3: Yes o No o N/A o 34 18.2.3.9, M 35 18.2.3.10, 36 18.2.3.11, 37 18.2.3.12 38 ,18.2.3.13, 39 18.2.3.14 40 41 HRDS4 Long Preamble process on RX 18.2.6 M Yes o No o 42 HRDS4.1 PLCP format 18.2.6 HRDS4: Yes o No o 43 M 44 HRDS4.2 PLCP integrity check verify 18.2.6 HRDS4: Yes o No o 45 M 46 HRDS4.3 RX Rate change capability 18.2.6 HRDS4: Yes o No o 47 M 48 HRDS4.4 Data whitener descrambler 18.2.6 HRDS4: Yes o No o 49 M 50 *HRDS5 Short Preamble process on RX 18.2.6 HRDS5: Yes o No o N/A o 51 M 52 HRDS5.1 PLCP format 18.2.6 HRDS5: Yes o No o N/A o 53 M 54 55 Copyright © 2001 IEEE. All rights reserved . 62 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 HRDS5.2 PLCP integrity check verify 18.2.6 HRDS5: Yes o No o N/A o 1 M 2 HRDS5.3 RX Rate change capability 18.2.6 HRDS5: Yes o No o N/A o 3 M 4 HRDS5.4 Data whitener descrambler 18.2.6 HRDS5: Yes o No o N/A o 5 M 6 *HRDS6 Operating channel capability 7 * HRDS6.1 North America (FCC) 18.4.6.2 HRDS6: Yes o No o N/A o 8 O.3 9 HRDS6.1.1 channel 1 18.4.6.2 HRDS6.1 Yes o No o N/A o 10 :M 11 HRDS6.1.2 channel 2 18.4.6.2 HRDS6.1 Yes o No o N/A o 12 :M 13 HRDS6.1.3 channel 3 18.4.6.2 HRDS6.1 Yes o No o N/A o 14 :M 15 HRDS6.1.4 channel 4 18.4.6.2 HRDS6.1 Yes o No o N/A o 16 :M 17 HRDS6.1.5 channel 5 18.4.6.2 HRDS6.1 Yes o No o N/A o 18 :M 19 HRDS6.1.6 channel 6 18.4.6.2 HRDS6.1 Yes o No o N/A o 20 :M 21 HRDS6.1.7 channel 7 18.4.6.2 HRDS6.1 Yes o No o N/A o 22 :M 23 HRDS6.1.8 channel 8 18.4.6.2 HRDS6.1 Yes o No o N/A o 24 :M 25 HRDS6.1.9 channel 9 18.4.6.2 HRDS6.1 Yes o No o N/A o 26 :M 27 HRDS6.1.10 channel 10 18.4.6.2 HRDS6.1 Yes o No o N/A o 28 29 :M HRDS6.1.11 channel 11 18.4.6.2 HRDS6.1 Yes o No o N/A o 30 31 :M * HRDS6.2 Canada (IC) 18.4.6.2 HRDS6: Yes o No o N/A o 32 33 O.3 HRDS6.2.1 channel 1 18.4.6.2 HRDS6.2 Yes o No o N/A o 34 35 :M HRDS6.2.2 channel 2 18.4.6.2 HRDS6.2 Yes o No o N/A o 36 37 :M HRDS6.2.3 channel 3 18.4.6.2 HRDS6.2 Yes o No o N/A o 38 39 :M HRDS6.2.4 channel 4 18.4.6.2 HRDS6.2 Yes o No o N/A o 40 41 :M HRDS6.2.5 channel 5 18.4.6.2 HRDS6.2 Yes o No o N/A o 42 43 :M HRDS6.2.6 channel 6 18.4.6.2 HRDS6.2 Yes o No o N/A o 44 45 :M 46 HRDS6.2.7 channel 7 18.4.6.2 HRDS6.2 Yes o No o N/A o 47 :M 48 HRDS6.2.8 channel 8 18.4.6.2 HRDS6.2 Yes o No o N/A o 49 :M 50 HRDS6.2.9 channel 9 18.4.6.2 HRDS6.2 Yes o No o N/A o 51 :M 52 HRDS6.2.10 channel 10 18.4.6.2 HRDS6.2 Yes o No o N/A o 53 :M 54 55 Copyright © 2001 IEEE. All rights reserved . 63 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 HRDS6.2.11 channel 11 18.4.6.2 HRDS6.2 Yes o No o N/A o 1 :M 2 * HRDS6.3 Europe (ETSI) 18.4.6.2 HRDS6: Yes o No o N/A o 3 O.3 4 HRDS6.3.1 channel 1 18.4.6.2 HRDS6.3 Yes o No o N/A o 5 :M 6 HRDS6.3.2 channel 2 18.4.6.2 HRDS6.3 Yes o No o N/A o 7 :M 8 HRDS6.3.3 channel 3 18.4.6.2 HRDS6.3 Yes o No o N/A o 9 :M 10 HRDS6.3.4 channel 4 18.4.6.2 HRDS6.3 Yes o No o N/A o 11 :M 12 HRDS6.3.5 channel 5 18.4.6.2 HRDS6.3 Yes o No o N/A o 13 :M 14 HRDS6.3.6 channel 6 18.4.6.2 HRDS6.3 Yes o No o N/A o 15 :M 16 HRDS6.3.7 channel 7 18.4.6.2 HRDS6.3 Yes o No o N/A o 17 :M 18 HRDS6.3.8 channel 8 18.4.6.2 HRDS6.3 Yes o No o N/A o 19 :M 20 HRDS6.3.9 channel 9 18.4.6.2 HRDS6.3 Yes o No o N/A o 21 :M 22 HRDS6.3.10 channel 10 18.4.6.2 HRDS6.3 Yes o No o N/A o 23 :M 24 HRDS6.3.11 channel 11 18.4.6.2 HRDS6.3 Yes o No o N/A o 25 :M 26 HRDS6.3.12 channel 12 18.4.6.2 HRDS6.3 Yes o No o N/A o 27 28 :M HRDS6.3.13 channel 13 18.4.6.2 HRDS6.3 Yes o No o N/A o 29 30 :M * HRDS6.4 France 18.4.6.2 HRDS6: Yes o No o N/A o 31 32 O.3 HRDS6.4.1 channel 10 18.4.6.2 HRDS6.4 Yes o No o N/A o 33 34 :M HRDS6.4.2 channel 11 18.4.6.2 HRDS6.4 Yes o No o N/A o 35 36 :M HRDS6.4.3 channel 12 18.4.6.2 HRDS6.4 Yes o No o N/A o 37 38 :M HRDS6.4.4 channel 13 18.4.6.2 HRDS6.4 Yes o No o N/A o 39 40 :M * HRDS6.5 Spain 18.4.6.2 HRDS6: Yes o No o N/A o 41 42 O.3 HRDS6.5.1 channel 10 18.4.6.2 HRDS6.5 Yes o No o N/A o 43 44 :M 45 HRDS6.5.2 channel 11 18.4.6.2 HRDS6.5 Yes o No o N/A o 46 :M 47 * HRDS6.6 Japan 18.4.6.2 HRDS6: Yes o No o N/A o 48 O.3 HRDS6.6.1 Channel 1 18.4.6.2 HRDS6.6: Yes o No o 49 M N/A o 50 HRDS6.6.2 Channel 2 18.4.6.2 HRDS6.6: Yes o No o 51 M N/A o HRDS6.6.3 Channel 3 18.4.6.2 HRDS6.6: Yes o No o 52 M N/A o 53 54 55 Copyright © 2001 IEEE. All rights reserved . 64 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 HRDS6.6.4 Channel 4 18.4.6.2 HRDS6.6: Yes o No o 1 M N/A o 2 HRDS6.6.5 Channel 5 18.4.6.2 HRDS6.6: Yes o No o M N/A o 3 HRDS6.6.6 Channel 6 18.4.6.2 HRDS6.6: Yes o No o 4 M N/A o 5 HRDS6.6.7 Channel 7 18.4.6.2 HRDS6.6: Yes o No o 6 M N/A o HRDS6.6.8 Channel 8 18.4.6.2 HRDS6.6: Yes o No o 7 M N/A o 8 HRDS6.6.9 Channel 9 18.4.6.2 HRDS6.6: Yes o No o 9 M N/A o 10 HRDS6.6.10 Channel 10 18.4.6.2 HRDS6.6: Yes o No o M N/A o 11 HRDS6.6.11 Channel 11 18.4.6.2 HRDS6.6: Yes o No o 12 M N/A o 13 HRDS6.6.12 Channel 12 18.4.6.2 HRDS6.6: Yes o No o 14 M N/A o HRDS6.6.13 Channel 13 18.4.6.2 HRDS6.6: Yes o No o 15 M N/A o 16 HRDS6.6.14 Channel 14 18.4.6.2 HRDS6.6: Yes o No o 17 M N/A o 18 HRDS8 Hop Sequences HRDS2: Yes o No o N/A o 19 M 20 HRDS8 CCK Bits to Symbol Mapping 21 HRDS8.1 5.5 Mbit/s 18.4.6.5 HRDS8: Yes o No o 22 M 23 HRDS8.2 11 Mbit/s 18.4.6.5 HRDS8: Yes o No o 24 M 25 *HRDS9 PBCC Bits to Symbol Mappings 18.4.6.6 O 26 HRDS9.1 5.5 Mbit/s 18.4.6.6 HRDS9: Yes o No o 27 M 28 HRDS9.2 11 Mbit/s 18.4.6.6 HRDS9: Yes o No o 29 M 30 *HRDS10 CCA functionality 18.4.8.4 31 HRDS10.1 CCA mode 1, Energy Only (RSSI 18.4.8.4 HRDS10: Yes o No o 32 above threshold) O.4 33 HRDS10.2 CCA mode 4, Carrier sense with 18.4.8.4 HRDS10: Yes o No o 34 timer O.4 35 HRDS10.3 CCA mode 5, Energy detect with 18.4.8.4 HRDS10: Yes o No o 36 high rate CS O.4 37 HRDS10.4 Hold CCA busy for packet duration 18.2.6 M Yes o No o 38 of a correctly received PLCP but 39 carrier lost during reception of 40 MPDU 41 HRDS10.5 Hold CCA busy for packet duration 18.2.6 M Yes o No o 42 of a correctly received but out of 43 spec PLCP 44 HRDS11 Transmit antenna selection 18.4.5.8, O Yes o No o 45 HRDS12 Receive antenna diversity 18.4.5.8, O Yes o No o 46 18.4.5.9 47 *HRDS13 antenna port(s) availability 18.4.6.8 O Yes o No o 48 HRDS13.1 if available (50 ohm impedance) 18.4.6.8 HRDS13: Yes o No o N/A o 49 M 50 *HRDS14 transmit power level support 18.4.5.9, O Yes o No o 51 18.4.7.2 52 HRDS14.1 if greater than 100mW capability 18.4.7.2 HRDS14: Yes o No o N/A o 53 M 54 55 Copyright © 2001 IEEE. All rights reserved . 65 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 *HRDS15 radio type (temperature range) 18.4.6.14 1 HRDS15.1 Type 1 18.4.6.14 HRDS15: Yes o No o N/A o 2 O.5 3 HRDS15.2 Type 2 18.4.6.14 HRDS15: Yes o No o N/A o 4 O.5 5 HRDS16 Spurious Emissions conformance 18.4.6.8 M Yes o No o 6 HRDS17 TX - RX turnaround time 18.4.6.9 M Yes o No o 7 HRDS18 RX - TX turnaround time 18.4.6.10 M Yes o No o 8 HRDS19 Slot Time 18.4.6.11 M Yes o No o 9 HRDS20 ED reporting time 18.4.6.10, M Yes o No o 10 18.4.8.4 11 HRDS21 minimum transmit power level 18.4.7.2 M Yes o No o 12 HRDS22 transmit spectral mask conformance 18.4.7.3 M Yes o No o 13 HRDS23 transmitted center frequency toler- 18.4.7.4 M Yes o No o 14 ance 15 HRDS24 chip clock frequency tolerance 18.4.7.5 M Yes o No o 16 HRDS25 transmit power on ramp 18.4.7.6 M Yes o No o 17 HRDS26 transmit power down ramp 18.4.7.6 M Yes o No o 18 HRDS27 RF carrier suppression 18.4.7.7 M Yes o No o 19 HRDS28 transmit modulation accuracy 18.4.7.8 M Yes o No o HRDS29 receiver minimum input level sensi- 18.4.8.1 M Yes o No o 20 21 tivity HRDS30 receiver maximum input level 18.4.8.2 M Yes o No o 22 HRDS31 receiver adjacent channel rejection 18.4.8.3 M Yes o No o 23 HRDS32 Management Information Base 13.1, 18.3.2, M Yes o No o 24 Annex C 25 HRDS32.1 PHY Object Class 13.1, 18.3.3, M Yes o No o 26 27 28 29 Annex C: Formal Description of MAC Operation (Normative) 30 31 For the HR/DSSS PHY, replace the use of aMPDUDurationFactor, aPreambleLength, and aPLCPHead- 32 erLength with the use of PLME-TXTIME.request and PLME-TXTIME.confirm primitives in the formal 33 description, updating the following diagrams: 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 66 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 Package macsorts 3127_e\PHY_Params(31) 6 7 /******************************************************************* 8 * Generic PHY parameter set sort 9 *******************************************************************/ /* Generic PHY parameter element for signals related to Beacons */ 10 /* and Probe Responses that are PHY-type independent. */ 11 syntype PhyParms = Octetstring endsyntype PhyParms; 12 13 NEWTYPE PhyChrstcs struct 14 aSlotTime Usec; aSifsTime Usec; 15 aCCATime Usec; 16 aRxTxTurnaroundTime Usec; 17 aTxPLCPDelay Usec; aRxPLCPDelay Usec; 18 aRxTxSwitchTime Usec; 19 aTxRampOnTime Usec; 20 aTxRampOffTime Usec; aTxRFDelay Usec; 21 aRxRFDelay Usec; 22 aAirPropagationTime Usec; 23 aMACProcessingDelay Usec; aPreambleLength Usec; 24 aPLCPHeaderLength Usec; 25 aMPDUMaxLength Integer; aCWmin Integer; 26 aCWmax Integer; 27 EndNewType PhyChrstcs; 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 67 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 use macsorts ; 3 4 5 Package macmib 6 3204_e\PhyOperation(5) 7 8 9 10 11 /******************************************************************* 12 * PhyOperation Table * (values shown are mostly for FH PHY) 13 *******************************************************************/ 14 synonym FHphy Integer = 01; /* enumerated dot11PHYType value */ synonym DSphy Integer = 02; /* enumerated dot11PHYType value */ 15 synonym IRPhy Integer = 03; /* enumerated dot11PHYType value */ 16 synonym dot11PHYType Integer = FHphy; 17 remote dot11CurrentRegDomain Integer nodelay; synonym dot11TempType Integer = 01; 18 19 /****************************************************************************************** 20 * PhyCharacteristic Parameters (values shown are mostly for FH PHY ) **************************************************************************************/ 21 /* NOTE: The PhyCharacteristics are defined as synonyms because 22 their values are static during MAC operation. It is assumed 23 that , during each initialization of MAC operation, current values for each of these parameters are obtained from the 24 PHY using the PlmeCharacteristics primitive. */ 25 remote procedure TxTime; returns Integer; synonym aSlotTime Usec = (aCcaTime + aRxTxTurnaroundTime + 26 aAirPropagationTime + aMacProcessingTime); 27 synonym aCcaTime Usec = 27; 28 synonym aRxTxTurnaroundTime Usec = (aTxPlcpDelay + aRxTxSwitchTime + aTxRampOnTime + aTxRfDelay); 29 synonym aTxPlcpDelay Usec = 1; 30 synonym aRxTxSwitchTime Usec = 10; 31 synonym aTxRampOnTime Usec = 8; synonym aTxRfDelay Usec = 1; 32 synonym aSifsTime Usec = (aRxRfDelay + aRxPlcpDelay + 33 aMacProcessingTime + aRxTxTurnaroundTime); 34 synonym aRxRfDelay Usec = 4; synonym aRxPlcpDelay Usec = 2; 35 synonym aMacProcessingTime Usec = 2; 36 synonym aTxRampOffTime Usec = 8; synonym aPreambleLength Usec = 96; 37 synonym aPlcpHeaderLength Usec = 32; 38 synonym aMpduMaxLength Integer = 4095; 39 synonym aAirPropagationTime Usec = 1; synonym aCWmax Integer = 1023; 40 synonym aCWmin Integer = 15; 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 68 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_idle_2.1a(9) 3 chk_ 4 data 5 6 7 AP responds to PsPoll after 'respond 8 with data?' Sifs with Ack (true) 9 or data. Basis (false) 10 for choice of response is 11 unspecified. 12 13 PsPoll_ 14 _Sifs 15 16 Pdu_ 17 Tifs Request * 18 (fsdu) 19 20 rspdu:= mkCtl(ack,O2, addr2 addr1(fsdu!pdus(1)) 21 (rpdu)= addr2(rpdu)) (false) 22 (true) 23 PduRe_ 24 TxRequest Sifs_Data_ quest(fsdu) 25 (rspdu,rxrate) _Response to self 26 27 tx_ - Tifs * 28 wait 29 30 31 txc_ req 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 69 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 70 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 Package macsorts 3125_e\RateAndDurationSorts(31) 6 7 /******************************************************************* 8 * Multi-rate support sorts 9 *******************************************************************/ newtype Rate inherits Octet operators all; 10 adding operators 11 calcDur : Rate, Integer -> Integer; /* converts (rate,bitCount) to integer usec */ rateVal : Rate -> Rate; /* clears high-order bit */ 12 basicRate : Rate -> Rate; /* sets high-order bit */ 13 isBasic : Rate -> Boolean; /* true if high-order bit set */ 14 axioms for all r in Rate( for all i in Integer( for all b in Boolean( 15 calcDur(r, i) == ((((10000000 + (octetVal(r and 0x7F) - 1)) / 16 (500 * octetVal(r and 0x7F))) * i) + 9999) / 10000; 17 rateVal(r) == r and 0x7F; basicRate(r) == r or 0x80; isBasic(r) == (r and 0x80) = 0x80; ))); 18 endnewtype Rate; 19 syntype RateString = Octetstring endsyntype RateString; 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 71 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 72 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_idle_2.1a(9) 3 4 chk_ 5 data 6 7 AP responds 'respond 8 to PsPoll after 9 with data?' Sifs with Ack (true) or data. Basis (false) 10 for choice of 11 response is unspecified. 12 13 PsPoll_ 14 _Sifs 15 16 17 Pdu_ Tifs Request * 18 (fsdu) 19 20 rspdu:= addr2 21 mkCtl(ack,O2, addr1(fsdu!pdus(1)) (rpdu)= 22 addr2(rpdu)) (false) (true) 23 24 PduRe_ TxRequest Sifs_Data_ 25 quest(fsdu) (rspdu,rxrate) _Response to self 26 27 28 tx_ - Tifs * wait 29 30 31 txc_ 32 req 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 73 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_dcf_3.1e(9) 3 4 5 6 7 cnfrm_ 8 Wait_Cts pdu 9 10 11 Cts slrc:=0, fsdu!lrc:=0, (endRx, Trsp * 12 ssrc:=0, fsdu!src:=0 txrate) 13 14 cTfrg:= If (fsdu!grpa) 15 reset cNcts:= inc(cTfrg), then inc(cTmcfrm) 16 (Trsp) inc(cNcts) cTmcfrm:= else cTmcfrm fi 17 18 ssrc:=0, fsdu!fTot= 19 export(cNcts) fsdu!src:=0 fsdu!fCur+1 (false) 20 (true) 21 22 cCts:= cts_ cTfrm:= fsdu!eol inc(cCts) fail inc(cTfrm) < now 23 (false) 24 (true) 25 PduConfirm PduConfirm export(cCts) (fsdu, (fsdu, fsdu!fCur:= 26 fsdu!fCur+1 27 success) txLife) 28 set(endRx 29 TxC_Idle send_ +dSifsDelay, frag 30 Tifs) 31 32 tpdu:= (aSifsTime + ackctstime (false) import and (ftype(tpdu)=beacon) 33 setDurId + if (fsdu!fTot = (fsdu! (mCfp) (tpdu, fCur+1)) then 0 else 34 ((2*aSifsTime)+ ackctstime + 35 frametime ) fi )) (true) 36 Wait_Cts_ set(now+ aSlotTime, Trsp) dSifsDelay+ 37 _Sifs 38 39 40 Tifs TxC_Cfp 41 42 43 send_ Backoff 44 txReq (ccw,-1) 45 46 47 * TxC_Backoff 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 74 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 RSDU TPDU 6 7 Block Protocol_Control_AP MsduIndicate PduConfirm, ap_CTL_1d(1) 8 PsPolled 9 10 11 12 signal /* This block performs the 13 Ack(Time,Rate), DCF functions, as well as CfRsp(Time,Rate), serving as Point Coordinator 14 Cts(Time,Rate), if the AP provides a PCF. 15 PsPoll(Frame,Time,Rate), Tx_Coord_AP includes the TxCfAck(Time,Rate) ; PC, RTS generation and 16 (non-Ack) PS-Poll response. 17 Rx_Coord_AP generates acknowledgements, routes 18 management frames to MLME, Tdat Rdat routes data frames to MAC 19 Data Service, and signals 20 Ack, Cts, and PS-Poll frames Includes point to Tx_Coord_AP. */ 21 coordinator 22 for use with optional PCF. 23 24 25 PduRequest MmCancel, 26 SwChnl, Tbtt SwDone, 27 Tmgt MmIndicate BkDone, Tx_Coordination_ MCTL 28 TxConfirm _AP (1,1) 29 /* AP version */ 30 31 Ack, 32 PlmeGet_ CfRsp, BcMgt .confirm, Cts, MmIndicate, 33 PlmeSet_ PsPoll, SsInquiry TxO .confirm, TxCfAck 34 Plme_ 35 Reset_ .confirm, 36 Backoff, SsResponse Cancel, Pctl PlmeTxTime_ 37 TxRequest .confirm Rctl TxRx 38 Rx_Coordination 39 (1,1) 40 Trsp /*for STA & AP */ TX 41 PlmeGet_ TxRequest .request, TxConfirm 42 PlmeSet_ .request, RxIndicate, 43 NeedAck, PlmeReset_ RxCfAck 44 .request, PlmeTxTime_ 45 RxI .request 46 ChangeNav 47 MLME_PLME_SAP RX 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 75 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_dcf_3e(9) 3 4 send_ send_ 5 rts mpdu 6 7 Wait_Rts_ Wait_Mpdu_ 8 _Backoff _Backoff 9 10 11 BkDone( BkDone( 12 * * bstat) bstat) 13 14 15 bstat=-2 send_ bstat=-2 txReq 16 (false) (false) (true) (true) 17 18 mFxIP:=true, cTfrg:= Backoff( TxRequest Backoff( 19 ccw,-1) (tpdu,txrate) ccw,-1) inc(cTfrg) 20 21 export 22 (mFxIP, TxC_Backoff fsdu!grpa TxC_Backoff 23 cTfrg) (true) (false) 24 25 TxRequest end_ Wait_Pdu_ 26 (rtsdu,txrate) fx _Sent 27 28 29 Wait_Rts_ mFxIP:=false TxConfirm * _Sent 30 31 32 Ack signal is set(now+dUsec ackctstime 33 export TxConfirm * generated (aSifsTime + +aSlotTime)), (mFxIP) 34 when Ack, calcDur(txrate, Trsp) CfAck, or 35 Data+CfAck 36 set(now+dUsec ackctstime + received. ccw:= (aSifsTime + aSlotTime)), Wait_Ack 37 aCWmin calcDur(txrate, Trsp) 38 39 Ack 40 Wait_Cts cnfrm_ * Trsp (endRx, pdu txrate) 41 42 43 end_ cNack:= 44 fx inc(cNack) 45 46 47 export(cNack) 48 49 50 ack_ 51 fail 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 76 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_idle_2.1a(9) 3 4 chk_ 5 data 6 7 AP responds 'respond 8 to PsPoll after 9 with data?' Sifs with Ack (true) or data. Basis (false) 10 for choice of 11 response is unspecified. 12 13 PsPoll_ 14 _Sifs 15 16 17 Pdu_ Tifs Request * 18 (fsdu) 19 20 rspdu:= addr2 21 mkCtl(ack,O2, addr1(fsdu!pdus(1)) (rpdu)= 22 addr2(rpdu)) (false) (true) 23 24 PduRe_ TxRequest Sifs_Data_ 25 quest(fsdu) (rspdu,rxrate) _Response to self 26 27 28 tx_ - Tifs * wait 29 30 31 txc_ 32 req 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 77 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_idle_2e(9) 3 4 Ack, Cfend, Cts, Wake These transitions are and MmCancel ignored TxC_Idle only present at APs 5 in TxC_Idle state. with point coordinator. 6 7 Pdu_ Entry when import PsPoll TxCfAck 8 Request station wakes (rpdu, 9 (mCfp) (endRx, ) (fsdu) up to transmit. endRx, rxrate) 10 11 PsPolled tpdu:= import(mBssId), not import( txc_ 12 TxC_Cfp (addr2(rpdu), mkFrame( import(mBssId), mBkIP) req AId(rpdu)) Cfack, ) 13 14 tpdu:= set(endRx 15 tx_ fdsu!pdus +dSifsDelay, 16 sifs (fsdu!fCur) Tifs) 17 18 Test if fsdu seq fsdu!eol nmbr and tx chk_ 19 data lifetime set. 20 else (=0) 21 seqnum:= if seqnum=4095 then 0 22 fsdu!sqf:= seqnum, else seqnum+1 fi, fsdu!eol:=now + 23 import(dot11MaxTransmitMsduLifetime) 24 25 tpdu:= tpdu:= 26 send_ setSeq(tpdu, fdsu!pdus frag 27 fsdu!sqf) (fsdu!fCur) 28 'txrate:= See 9.6 for rules 29 selected tx about selecting 30 data rate' transmit data rate. 31 32 TxTime(sAck_ See corresponding page of station 33 CtsLng/8,txrate, version for comments on use sCrcLng) > import(dot11RtsThreshold)) ackctstime) with FH & IR PHYs. and (not fsdu!grpa) and ((fsdu!fCur=0) 34 or retry(tpdu) or fsdu!resume) 35 and (not import(mCfp)) TxTime(length( 36 fsdu!pdus( txrate, frametime) 37 fsdu!fCur+1)), 38 39 tpdu:= (calcDur(txrate, aSifsTime + 40 ((length setDurId(tpdu, ackctstime + (aSifsTime + if (fsdu!fTot = (fsdu!fCur+1)) (tpdu) + 41 then 0 (false) (true) 42 else ((2*aSifsTime) + 43 tpdu:=setPwrMgt ackctstime + frametime ) TxTime(length (tpdu,import( fi) ))) (tpdu),txrate, 44 dot11PowerMan_ frametime2) 45 agementMode)) 46 Backoff( rtsdu:= (3*aSifsTime) + 47 mkctl(rts, 0,0) ackctstime ) 48 frametime2+ 49 50 send_ send_ 51 mpdu rts 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 78 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_AP ap_tx_init_1e(9) 3 4 5 6 7 timer Tifs, Trsp ; 8 * 9 10 dcl ackctstime, bstat, chan , frametime, 11 ResetMAC exported 12 frametime2 Integer ; TxTime dcl ccw Integer:= aCwMin ; 13 dcl curPm Bit ; dcl doHop, psmChg, cont Boolean:= false ; 14 PlmeReset._ dcl dSifsDelay, endRx Time ; 15 Request dcl fsdu FragSdu ; 16 dcl rtype Ftype ; dcl rxAid AssocId ; 17 dcl rxrate Rate ; 18 dSifsDelay:= dcl seqnum, ssrc, slrc, n Integer:= 0; aRxTxTurn_ 19 dUsec dcl tpdu, rpdu, rspdu Frame ; aroundTime) (aSifsTime - dcl txrate Rate ; 20 dcl cont Boolean ; 21 'mmrate:= Mmrate must be 22 rate to send selected from 23 mmpdus' mBrates. Other selection criteria 24 are not specified. 25 Imported dot11RtsThreshold, ssrc:= 0, 26 dot11ShortRetryLimit, slrc:= 0 dot11LongRetryLimit, 27 dot11FragmentationThreshold, 28 dot11MaxTransmitMsduLifetime Integer ; ccw:= 29 import 30 (aCWmin), 31 32 /* RANDOM NUMBER FUNCTION */ Backoff imported procedure Random ; 33 (ccw,-1) fpar limit Integer ; returns Integer ; 34 35 dcl exported FxIP Boolean:= false ; 36 TxC_Idle dcl cTfrg exported as 37 dot11TransmittedFragmentCount, cTfrm exported as 38 dot11TransmittedFrameCount, 39 cTmcfrm exported as 40 dot11MulticastTransmittedFrameCount, cFail exported as dot11FailedCount, 41 cRtry exported as dot11RetryCount, 42 cMrtry exported as dot11MultipleRetryCount, 43 cCts exported as dot11RtsSuccessCount, cNcts exported as dot11RtsFailureCount, 44 cNack exported as dot11AckFailureCount 45 Counter32:= 0 ; 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 79 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 use macsorts ; 3 use macmib ; 4 5 System Access_Point AP_signallists_3b(3)6 7 8 9 10 11 signallist signallist signallist MlmeRequestSignals= MlmeConfirmSignals= MlmeIndicationSignals= 12 MlmeAssociate.request, MlmeAssociate.confirm, MlmeAuthenticate.indication, 13 MlmeAuthenticate.request, MlmeAuthenticate.confirm, MlmeDeauthenticate.indication, 14 MlmeDeauthenticate.request, MlmeDeauthenticate.confirm, MlmeDisassociate.indication, MlmeDisassociate.request, MlmeDisassociate.confirm, MlmeAssociate.indication, 15 MlmeGet.request, MlmeGet.confirm, MlmeReassociate.indication ; 16 MlmeJoin.request, MlmeJoin.confirm, MlmePowermgt.request, MlmePowermgt.confirm, 17 MlmeReassociate.request, MlmeReassociate.confirm, 18 MlmeReset.request, MlmeReset.confirm, 19 MlmeScan.request, MlmeScan.confirm, MlmeSet.request, MlmeSet.confirm, 20 MlmeStart.request ; MlmeStart.confirm ; 21 22 signallist signallist signallist 23 SmtRequestSignals= SmtConfirmSignals= SmtIndicationSignals= 24 MlmeAssociate.request, MlmeAssociate.confirm, MlmeAuthenticate.indication, 25 MlmeAuthenticate.request, MlmeAuthenticate.confirm, MlmeDeauthenticate.indication, MlmeDeauthenticate.request, MlmeDeauthenticate.confirm, MlmeDisassociate.indication, 26 MlmeDisassociate.request, MlmeDisassociate.confirm, MlmeAssociate.indication, 27 MlmeJoin.request, MlmeJoin.confirm, MlmeReassociate.indication ; 28 MlmeReassociate.request, MlmeReassociate.confirm, MlmeScan.request, MlmeScan.confirm, 29 MlmeStart.request ; MlmeStart.confirm ; 30 31 32 signallist signallist signallist 33 PhyTxRequestSignals= PhyTxConfirmSignals= PhyRxSignals= PhyTxStart.request, PhyTxStart.confirm, PhyRxStart.indication, 34 PhyTxEnd.request, PhyTxEnd.confirm, PhyRxEnd.indication, 35 PhyData.request ; PhyData.confirm ; PhyData.indication, 36 PhyCca.indication, PhyCcarst.confirm ; 37 38 signallist signallist 39 PlmeRequestSignals= PlmeConfirmSignals= PlmeCharacteristics.request, PlmeCharacteristics.confirm, 40 PlmeGet.request, PlmeGet.confirm, 41 PlmeSet.request, PlmeSet.confirm, PlmeReset.request, PlmeReset.confirm, 42 PlmeTxTime.request ; PlmeTxTime.confirm ; 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 80 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 use macsorts ; 3 use macmib ; 4 5 System Access_Point 6 AP_signals_2d(3) 7 newtype DsStatus literals signal 8 assoc, disassoc, reassoc, unknown MmCancel, 9 endnewtype DsStatus ; MmConfirm(Frame,TxStatus), MmIndicate(Frame,Time,Time,StateErr), 10 MmRequest(Frame,Imed,Rate), 11 signal MsduConfirm(Frame,CfPriority,TxStatus), AsChange(Frame,DsStatus), MsduIndicate(Frame,CfPriority), 12 Backoff(Integer,Integer), MsduRequest(Frame,CfPriority), 13 BkDone(Integer), NeedAck(MacAddr,Time,Duration,Rate), 14 Busy, PduConfirm(FragSdu,TxResult), Cancel, PduRequest(FragSdu), 15 ChangeNav(Time,Duration,NavSrc), PhyCca.indication(Ccastatus), 16 DsInquiry(MacAddr,MacAddr), PhyCcarst.confirm, DsNotify(MacAddr,DsStatus), 17 PhyCcarst.request, DsResponse(MacAddr,MacAddr,DsStatus), PhyData.confirm, 18 FromDsm(MacAddr,MacAddr,Octetstring), PhyData.indication(Octet), 19 Idle, PhyData.request(Octet), MaUnitdata.indication(MacAddr,MacAddr, 20 PhyRxEnd.indication(PhyRxStat), Routing,Octetstring,RxStatus, PhyRxStart.indication(Integer,Rate), 21 CfPriority,ServiceClass), PhyTxEnd.confirm, 22 MaUnitdata.request(MacAddr,MacAddr, PhyTxEnd.request, Routing,Octetstring,CfPriority,ServiceClass), PhyTxStart.confirm, 23 MaUnitdataStatus.indication(MacAddr, PhyTxStart.request(Integer,Rate), 24 MacAddr,TxStatus,CfPriority,ServiceClass), PlmeCharacteristics.confirm(PhyChrstcs), 25 MlmeAssociate.confirm(MlmeStatus), PlmeCharacteristics.request, MlmeAssociate.indication(MacAddr), PlmeGet.confirm(MibStatus, 26 MlmeAssociate.request(MacAddr,Kusec,Capability,Integer), MibAtrib,MibValue), 27 MlmeAuthenticate.confirm PlmeGet.request(MibAtrib), (MacAddr,AuthType,MlmeStatus), 28 PlmeReset.confirm(Boolean), MlmeAuthenticate.indication(MacAddr,AuthType), PlmeReset.request, 29 MlmeAuthenticate.request(MacAddr,AuthType,Kusec), PlmeSet.confirm(MibStatus,MibAtrib), 30 MlmeDeauthenticate.confirm(MacAddr,MlmeStatus), PlmeSet.request(MibAtrib,MibValue), MlmeDeauthenticate.indication(MacAddr,ReasonCode), 31 PlmeTxTime.confirm(Integer), MlmeDeauthenticate.request(MacAddr,ReasonCode), PlmeTxTime.request(Integer, Rate), 32 MlmeDisassociate.confirm(MlmeStatus), PsmDone, 33 MlmeDisassociate.indication(MacAddr,ReasonCode), PsPolled(MacAddr,AsocId), MlmeDisassociate.request(MacAddr,ReasonCode), PsChange(MacAddr,PsMode), 34 MlmeGet.confirm(MibStatus,MibAtrib,MibValue), PsIndicate(MacAddr,PsMode), 35 MlmeGet.request(MibAtrib), PsInquiry(MacAddr), 36 MlmeJoin.confirm(MlmeStatus), PsResponse(MacAddr,PsMode), MlmeJoin.request(BssDscr,Integer,Usec,Ratestring), ResetMAC, 37 MlmePowermgt.confirm(MlmeStatus), RxCfAck(MacAddr), 38 MlmePowermgt.request(PwrSave,Boolean,Boolean), RxIndicate(Frame,Time,Time,Rate), MlmeReassociate.confirm(MlmeStatus), 39 Slot, MlmeReassociate.indication(MacAddr), SsInquiry(MacAddr), 40 MlmeReassociate.request(MacAddr,Kusec,Capability,Integer), SsResponse(MacAddr, 41 MlmeReset.confirm(MlmeStatus), StationState,StationState), MlmeReset.request, 42 SwChnl(Integer,Boolean), MlmeScan.confirm(BssDscrSet,MlmeStatus), SwDone, 43 MlmeScan.request(BssTypeSet,MacAddr,Octetstring, ToDsm(MacAddr,MacAddr,Octetstring), 44 ScanType,Usec,Intstring,Kusec,Kusec), TxConfirm, MlmeSet.confirm(MibStatus,MibAtrib), TxRequest(Frame,Rate) ; 45 MlmeSet.request(MibAtrib,MibValue), 46 MlmeStart.confirm(MlmeStatus), 47 MlmeStart.request(Octetstring,BssType,Kusec, Integer,CfParms,PhyParms,IbssParms,Usec, 48 Capability,Ratestring,Ratestring) ; 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 81 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Filter_MPDU pre_filter_1c(4) 3 4 dcl exported cDup as dot11FrameDuplicateCount, cMc as dot11MulticastReceivedFrameCount, 5 cRx as dot11ReceivedFragmentCount Counter32:= 0 ; 6 7 TxTime( imported mBrates Ratestring, 8 sAckCtsLng/8, mBrates)),ackctstime) mBssid MacAddr, 9 first(import( mCfp Boolean, dot11GroupAddresses MacAddrSet, 10 mIbss Boolean, 11 dPsp:=dUsec( Duration of mSsid Octetstring, aSifsTime+calc_ PS-Poll and aStationId MacAddr ; 12 Dur(ackctstime)) Ack response. imported procedure Txtime; returns Integer; 13 14 cache:= Initialize tuple cache dcl ackctstime Integer; 15 clearTuple_ for duplicate filtering. dcl cache TupleCache ; 16 Cache(cache) Cache capacity is set dcl dup, myBss Boolean ; by "tupleCacheSize" dcl dNav, dPsp, dAck Duration ; 17 but a specific size dcl endRx, strTs Time ; 18 is not specified. dcl pdu Frame ; 19 Filter_Idle dcl rxRate Rate ; dcl src NavSrc ; 20 dcl wDefault KeyVector ; 21 dcl wExclude Boolean ; RxMpdu startTs,rxRate, 22 dcl wKeyMap KeyMapArray ; ResetMac (pdu, wExclude,wDefault, 23 endRx, wKeyMap) 24 /* This process filters valid received 25 dAck:= (durID(pdu) > 32767) frames by destination address, and BssId for group destination addresses. 26 if (moreFrag then dUsec(durId(pdu)) (pdu) = 1) and else 0 fi This process also maintains received 27 pdu counters and the tuple cache for 28 detecting duplicated unicast frames. PsIndicate Gather Power 29 (addr2(pdu), management Data and management frames which 30 pwrmgt(pdu)) info from all need acknowledgement cause a 31 valid frames. NeedAck signal to Protocol_Control as well as an RxMpdu to Defragment. 32 dNav:=dUsec Piggybacked CfAcks cause RxCfack 33 (durId(pdu)), signals, and CfPolls cause RxCfpoll src:= misc 34 signals to Protocol_Control. If an RxCfPoll is sent for a Data+CfPoll 35 or Data+CfPoll+CfAck, the NeedAck 36 mActing_ has to reach TxCoord during the Sifs. import( (The data frame report cannot serve 37 AsAp) (true) this purpose because the payload may 38 (false) be a non-final fragment.) 39 ap_ Duration and Cfp duration remaining 40 toDs(pdu) addr are reported to Channel_State, and 41 power save mode is reported to Mlme. */ 42 (=1) (=0) 43 AP, check Non-AP, sta_ 44 all frames, 2 durId(pdu) toDS=0 to addr pages ahead. accept frame, 45 else (1:32767) next page. 46 SetNav 47 (endRx, 48 dNav, src) 49 50 Filter_Idle Frames with toDs=1 ignored by non-APs, 51 except Duration/Id field for Nav update. 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 82 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 6 RSDU TPDU 7 8 Block Protocol_Control_STA AtimW, sta_CTL_1c(1) PduConfirm, 9 CfPolled 10 MsduIndicate 11 12 13 signal /* This block performs the Ack(Time,Rate), DCF functions, as well as 14 Cfend, CF-responder functions if 15 Cfpoll(Time,Rate), the station is CF-pollable. Cts(Time,Rate), Tx_Coordination includes 16 TxCfAck(Time,Rate) ; RTS and ATIM generation. 17 Rx_Coordination generates acknowledgements, routes 18 data frames to MAC data 19 service and management Tdat Rdat frames to MLME, an 20 indicates receipt of Ack, Cts, and CF-Poll frames 21 Includes the to Tx_Coordination. */ 22 CF responder if station is 23 Cf-pollable. 24 25 Doze, MmCancel, 26 PduRequest SwChnl, 27 Tbtt, PsmDone, Wake Tmgt SwDone 28 BkDone, MCTL TxConfirm Tx_Coordination_sta 29 (1,1) 30 /*station version*/ 31 32 Ack, PlmeGet_ Cts, BcMgt 33 .confirm, Cfend, MmIndicate, PlmeSet_ Cfpoll, SsInquiry 34 TxO .confirm, TxCfAck 35 Plme_ Reset_ 36 Backoff, .confirm, SsResponse 37 PlmeTxTime_ Cancel, .confirm 38 TxRequest Pctl Rctl TxRx 39 Rx_Coordination 40 (1,1) Trsp /* for STA and AP */ 41 TX 42 TxRequest TxConfirm PlmeGet_ 43 .request, RxIndicate, PlmeSet_ NeedAck, 44 .request, RxCfAck, 45 PlmeReset_ RxCfPoll .request, 46 RxI PlmeTxTime_ 47 .request ChangeNav 48 49 MLME_PLME_SAP RX 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 83 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_sta sta_tx_atim_5e(9) 3 4 Ack, CfPoll, Cts, Doze, Atim_ atim_ atim_ 5 MmCancel, Tbtt, TxCfAck Window fail ack and Wake ignored in this state. 6 7 not import Pdu_ PM_Filter ensures that a PduConfirm PduConfirm 8 Request beacon frame will be the (fsdu, (fsdu, 9 (mAtimW) (fsdu) first first sent after Tbtt. atimNak) atimAck) 10 else 11 ftype tpdu:= atimcw:=ccw, atim_ fsdu!fAnc:= 12 (fsdu!pdus(1)) mkFrame ccw:=dcfcw limit fsdu!fCur+1 (atim, 13 (beacon) 14 (>=0) Backoff n:= call PduConfirm 15 dcfcnt Backoff (ccw, Random (fsdu, 16 (ccw,-1) dcfcnt) (2*aCWmin) retryLimit) (<0) 17 18 fsdu!dst, cont:= false cont:= true Backoff Ibss_Wait_ dot11Mac_ Atim_ 19 (n,-1) Atim _Window Address, ) 20 21 22 Ibss_Wait_ not import BkDone TxC_Idle TxC_Backoff 23 _Beacon (mAtimW) (bstat) 24 25 TxRequest 26 * BkDone MmCancel atimcw:=ccw, (tpdu, (bstat) ccw:=dcfcw 27 mmrate) 28 TxRequest (true) 29 Cancel TxC_Idle fsdu! atim_ (fsdu!pdus(1), grpa ack 30 mmrate) 31 (false) 32 dRsp:=dUsec( 33 Wait_Beacon_ Wait_Beacon_ aSifsTime + txrate, ackctstime)) _Transmit _Cancel 34 calcDur( 35 set 36 * TxConfirm BkDone(n) * (now+dRsp, 37 Trsp) 38 39 Atim_ Atim_ Wait_Atim_ 40 _Window _Window Ack import(dot11_ 41 ShortRetry_ ssrc = 42 Limit) (true) (false) 43 Ack( , ) Trsp 44 ccw:= 45 aCwMin 46 ccw:= then aCWmax ccw:= if 47 else (2*ccw)+1 aCWmin ccw = aCWmax import(dot11_ 48 fi fsdu!src = ShortRetry_ 49 Limit) (false) (true)50 atim_ fsdu!src:= ssrc:= 51 ack fsdu!src+1 ssrc+1, atim_ limit 52 fail 53 54 55 Copyright © 2001 IEEE. All rights reserved . 84 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 Process Tx_Coordination_sta sta_tx_idle_2e(9) 4 5 Ack, Cfend, Cts, Wake These transitions are 6 TxC_Idle and MmCancel ignored only present at 7 in TxC_Idle state. Cf-pollable stations. 8 Pdu_ Entry when 9 CfPoll import TBTT TxCfAck Request station wakes (endRx, ) (mCfp) (endRx, ) 10 (fsdu) up to transmit. 11 12 not import( txc_ rx_ tpdu:= TxC_Cfp dcfcnt:= -1 mkFrame( 13 mBkIP) req poll Cfack, 14 15 tpdu:= fsdu!pdus * Atw_Start tx_ 16 sifs (fsdu!fCur) 17 18 fsdu!eol Test if fsdu seq BkDone import(mBssId), 19 nmber and tx import(mBssId), (dcfcnt) 20 lifetime set. ) else (=0) 21 fsdu!sqf:= seqnum:=if seqnum=4095 then 0 import 22 else seqnum+1 fi, fsdu!eol:= now + seqnum, import (dot11MaxTransmitMsduLifetime) (mIbss) 23 (false) (true) 24 tpdu:= tpdu:= 25 send_ - dcfcw:=ccw, setSeq(tpdu, fsdu!pdus frag ccw:=atimcw 26 fsdu!sqf) (fsdu!fCur) 27 28 'txrate:= See 9.6 for rules selected tx about selecting AtimW 29 data rate' transmit data rate. 30 31 TxTime( With FH PHY, if next fragment sAckCtsLng/8, will be after a dwell boundary, Atim_ 32 Window txrate, ackctstime) Duration/ID may be set to 33 one ACK time plus SIFS time. 34 TxTime(length( 35 fsdu!pdus( txrate,frametime) fsdu!fCur+1)), 36 37 tpdu:= aSifsTime+ackctstime+ ((length sCrcLng) > import( 38 setDurId(tpdu, if(fsdu!fTot=(fsdu!fCur+1)) dot11RtsThreshold)) and calcDur(txrate, then 0 (tpdu) + (not fsdu!grpa) and ((fsdu!fCur=0) 39 else ((2*aSifsTime)+ (true) or retry(tpdu) or (fsdu!resume)) 40 ackctstime+frametime) tpdu:=setPwrMgt( fi)) TxTime(length( 41 tpdu, import( tpdu),txrate, 42 dot11PowerMan_ frametime2) agementMode)) 43 rtsdu:= 44 (3*aSifsTime)+ Backoff(0,0) mkctl(rts, ackctstime )) 45 (false) (frametime2+ 46 47 send_ send_ 48 mpdu rts 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 85 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Tx_Coordination_sta sta_tx_init_1e(9) 3 /* at start of frame exchange 4 sequence, when setting mFxIP, 5 check if dot11PowerManagementMode=curPsm, if not, when indicating the new Psm, 6 also set psmChg boolean; 7 timer Tifs, at end of frame exchange 8 * Trsp, Tpdly ; sequence, when clearing FxIP, test & reset PsmChg, if 9 true, send PsmDone to Mlme */ 10 11 exported ResetMAC 12 TxTime 13 14 dcl ackctstime, atimcw, bstat, chan, dcfcnt, PlmeReset._ 15 dcfcw, frametime, frametime2 Integer ; Request dcl ccw Integer:= aCwMin ; 16 dcl curPm Bit ; 17 dcl doHop, psmChg, cont dSifsDelay:= Boolean:= false ; 18 aRxTxTurn_ 19 dUsec dcl dSifsDelay, endRx Time ; aroundTime) (aSifsTime - dcl fsdu FragSdu ; 20 dcl rtype Ftype ; dcl seqnum, ssrc, slrc, n Integer:= 0; 21 'mmrate:= Mmrate must be dcl tpdu Frame ; 22 rate to send selected from dcl txrate Rate ; 23 mmpdus' mBrates. Other selection criteria 24 are not specified. 25 dcl exported FxIP Boolean:= false ; ssrc:= 0, dcl cTfrg exported as 26 slrc:= 0 dot11TransmittedFragmentCount, 27 dcl cTfrm exported as dot11TransmittedFrameCount, 28 ccw:= dcfcw:= ccw, cTmcfrm exported as 29 import dot11MulticastTransmittedFrameCount, 30 atimcw:= ccw (aCWmin), cFail exported as dot11FailedCount, cRtry exported as dot11RetryCount, 31 cMrtry exported as dot11MultipleRetryCount, 32 cCts exported as dot11RtsSuccessCount, Backoff cNcts exported as dot11RtsFailureCount, 33 (ccw,-1) cNack exported as dot11AckFailureCount 34 Counter32:= 0 ; 35 36 TxC_Idle 37 38 39 Imported dot11RtsThreshold, dot11ShortRetryLimit, 40 dot11LongRetryLimit, 41 dot11FragmentationThreshold, 42 dot11MaxTransmitMsduLifetime Integer, mPdly Usec ; 43 44 45 46 /* RANDOM NUMBER FUNCTION */ imported procedure Random ; 47 fpar limit Integer ; returns Integer ; 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 86 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 Process Validate_MPDU start_rx_1b(2) 3 4 /* This process receives an MPDU from the * 5 PHY while calculating and checking the (Rx_Idle) FCS value. Frames with valid FCS, length 6 and protocol version are sent for receive filtering, along with a snapshot of the WEP 7 Calculate PHY D1:= dUsec keys if dot11PrivacyOptionImplemented=true. 8 Rx delay that (aRxRfDelay+ ResetMAC 9 is subtracted aRxPlcpDelay) This process also provides Channel_State from now to with Difs/Eifs and Rts timeout signals, 10 get reference and maintains the mRxA remote variable. */ 11 point times. reset(Trts) 12 13 14 dcl exported mRxA Boolean:=false, 15 cErr:=0, cErr as dot11FcsErrorCount Counter32:= 0 ; 16 mRxA:=false imported mBrates Ratestring, dot11WepDefaultKeys KeyVector, 17 dot11WepKeyMappings KeyMapArray, 18 export dot11ExcludeUnencrypted Boolean ; 19 (cErr,mRxA) timer Trts ; imported procedure TxTime; returns Integer; 20 21 Indicate Rts dcl fcs Crc ; 22 non-response Rx_Idle dcl D1, dRts Duration ; 23 timeout. dcl endRx, startTs Time ; dcl ackctstime, k, rxLength Integer ; 24 dcl pdu Frame ; 25 PhyRxStart._ (rxLength, dcl rxRate Rate ; 26 Trts dcl status PhyRxStat ; indication rxRate) 27 dcl v Octet ; dcl wDefault KeyVector ; 28 dcl wKeyMap KeyMapArray ; 29 dcl wExclude Boolean ; Save copy of RtsTimeout reset(Trts) WEP keys at 30 RxStart in case 31 Mpdu is first fragment of 32 Indicate that encrypted 33 save_ - mRxA:=true a reception Msdu/Mmpdu. keys 34 is in progress. 35 wDefault:= 36 dot11Wep_ export(mRxA) import( 37 DefaultKeys) 38 39 k:= 0, Initialize CRC & 40 wKeyMap:= dot11Wep_ fcs:= initCrc, clear pdu buffer pdu:= null (length(pdu)=0). import( KeyMappings) 41 42 43 Option_ wExclude:= (dot11Exclude_ 44 dot11Privacy_ Implemented import Unencrypted) 45 (false) (true) 46 save_ 47 Rx_Frame Rx_Frame keys 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 87 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 use macsorts ; 4 use macmib ; 5 6 System Station Sta_signals_2d(3) 7 8 signal 9 MmCancel, MmConfirm(Frame,TxStatus), 10 MmIndicate(Frame,Time,Time,StateErr), 11 MmRequest(Frame,Imed,Rate), signal MsduConfirm(Frame,CfPriority,TxStatus), 12 AtimW, MsduIndicate(Frame,CfPriority), 13 Backoff(Integer,Integer), MsduRequest(Frame,CfPriority), BkDone(Integer), NeedAck(MacAddr,Time,Duration,Rate), 14 Busy, PduConfirm(FragSdu,TxResult), 15 Cancel, PduRequest(FragSdu), CfPolled, PhyCca.indication(Ccastatus), 16 ChangeNav(Time,Duration,NavSrc), PhyCcarst.confirm, 17 Doze, PhyCcarst.request, Idle, PhyData.confirm, 18 MaUnitdata.indication(MacAddr,MacAddr, PhyData.indication(Octet), 19 Routing,Octetstring,RxStatus, PhyData.request(Octet), CfPriority,ServiceClass), PhyRxEnd.indication(PhyRxStat), 20 MaUnitdata.request(MacAddr,MacAddr, PhyRxStart.indication(Integer,Rate), 21 Routing,Octetstring,CfPriority,ServiceClass), PhyTxEnd.confirm, MaUnitdataStatus.indication(MacAddr, PhyTxEnd.request, 22 MacAddr,TxStatus,CfPriority,ServiceClass), PhyTxStart.confirm, 23 MlmeAssociate.confirm(MlmeStatus), PhyTxStart.request(Integer,Rate), MlmeAssociate.indication(MacAddr), PlmeCharacteristics.confirm(PhyChrstcs), 24 MlmeAssociate.request(MacAddr,Kusec,Capability,Integer), PlmeCharacteristics.request, MlmeAuthenticate.confirm 25 PlmeGet.confirm(MibStatus, (MacAddr,AuthType,MlmeStatus), MibAtrib,MibValue), 26 MlmeAuthenticate.indication(MacAddr,AuthType), PlmeGet.request(MibAtrib), MlmeAuthenticate.request(MacAddr,AuthType,Kusec), 27 PlmeReset.confirm(Boolean), MlmeDeauthenticate.confirm(MacAddr,MlmeStatus), PlmeReset.request, 28 MlmeDeauthenticate.indication(MacAddr,ReasonCode), PlmeSet.confirm(MibStatus,MibAtrib), MlmeDeauthenticate.request(MacAddr,ReasonCode), 29 PlmeSet.request(MibAtrib,MibValue), MlmeDisassociate.confirm(MlmeStatus), PlmeTxTime.confirm(Integer), 30 MlmeDisassociate.indication(MacAddr,ReasonCode), PlmeTxTime.request(Integer, Rate), MlmeDisassociate.request(MacAddr,ReasonCode), 31 PsmDone, MlmeGet.confirm(MibStatus,MibAtrib,MibValue), PsChange(MacAddr,PsMode), 32 MlmeGet.request(MibAtrib), PsIndicate(MacAddr,PsMode), MlmeJoin.confirm(MlmeStatus), PsInquiry(MacAddr), 33 MlmeJoin.request(BssDscr,Integer,Usec,Ratestring), PsResponse(MacAddr,PsMode), 34 MlmePowermgt.confirm(MlmeStatus), ResetMAC, MlmePowermgt.request(PwrSave,Boolean,Boolean), RxCfAck(MacAddr), 35 MlmeReassociate.confirm(MlmeStatus), RxIndicate(Frame,Time,Time,Rate), 36 MlmeReassociate.indication(MacAddr), Slot, MlmeReassociate.request(MacAddr,Kusec,Capability,Integer), SsInquiry(MacAddr), 37 MlmeReset.confirm(MlmeStatus), SsResponse(MacAddr, 38 MlmeReset.request(MacAddr,Boolean), StationState,StationState), MlmeScan.confirm(BssDscrSet,MlmeStatus), SwChnl(Integer,Boolean), 39 MlmeScan.request(BssTypeSet,MacAddr,Octetstring, SwDone, 40 ScanType,Usec,Intstring,Kusec,Kusec), TBTT, MlmeSet.confirm(MibStatus,MibAtrib), TxConfirm, 41 MlmeSet.request(MibAtrib,MibValue), TxRequest(Frame,Rate), 42 MlmeStart.confirm(MlmeStatus), Wake ; MlmeStart.request(Octetstring,BssType,Kusec, 43 Integer,CfParms,PhyParms,IbssParms,Usec, 44 Capability,Ratestring,Ratestring) ; 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 88 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 use macsorts ; 5 use macmib ; 6 7 System Station Sta_signallists_3c(3) 8 9 10 11 12 signallist signallist signallist 13 MlmeRequestSignals= MlmeConfirmSignals= MlmeIndicationSignals= MlmeAssociate.request, MlmeAssociate.confirm, MlmeAuthenticate.indication, 14 MlmeAuthenticate.request, MlmeAuthenticate.confirm, MlmeDeauthenticate.indication, 15 MlmeDeauthenticate.request, MlmeDeauthenticate.confirm, MlmeDisassociate.indication, MlmeDisassociate.request, MlmeDisassociate.confirm, MlmeAssociate.indication, 16 MlmeGet.request, MlmeGet.confirm, MlmeReassociate.indication ; 17 MlmeJoin.request, MlmeJoin.confirm, MlmePowermgt.request, MlmePowermgt.confirm, 18 MlmeReassociate.request, MlmeReassociate.confirm, 19 MlmeReset.request, MlmeReset.confirm, MlmeScan.request, MlmeScan.confirm, 20 MlmeSet.request, MlmeSet.confirm, 21 MlmeStart.request ; MlmeStart.confirm ; 22 23 24 signallist signallist signallist MmgtRequestSignals= MmgtConfirmSignals= MmgtIndicationSignals= 25 MlmeAssociate.request, MlmeAssociate.confirm, MlmeAuthenticate.indication, 26 MlmeAuthenticate.request, MlmeAuthenticate.confirm, MlmeDeauthenticate.indication, MlmeDeauthenticate.request, MlmeDeauthenticate.confirm, MlmeDisassociate.indication, 27 MlmeDisassociate.request, MlmeDisassociate.confirm, MlmeAssociate.indication, 28 MlmeJoin.request, MlmeJoin.confirm, MlmeReassociate.indication ; MlmePowermgt.request, MlmePowermgt.confirm, 29 MlmeReassociate.request, MlmeReassociate.confirm, 30 MlmeScan.request, MlmeScan.confirm, MlmeStart.request ; MlmeStart.confirm ; 31 32 33 signallist signallist signallist 34 PhyTxRequestSignals= PhyTxConfirmSignals= PhyRxSignals= 35 PhyTxStart.request, PhyTxStart.confirm, PhyRxStart.indication, PhyTxEnd.request, PhyTxEnd.confirm, PhyRxEnd.indication, 36 PhyData.request ; PhyData.confirm ; PhyData.indication, 37 PhyCca.indication, PhyCcareset.confirm ; 38 39 40 signallist signallist PlmeRequestSignals= PlmeConfirmSignals= 41 PlmeCharacteristics.request, PlmeCharacteristics.confirm, 42 PlmeGet.request, PlmeGet.confirm, PlmeSet.request, PlmeReset.confirm, 43 PlmeReset.request, PlmeSet.confirm, 44 PlmeTxTime.request; PlmeTxTime.confirm; 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 89 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 ;fpar 3 in/out xtime Integer, 4 in xleng Integer, 5 in xrate Rate; 6 7 8 9 * 10 11 12 PlmeTxTime._ request( * 13 xleng,xrate) 14 15 Wait_Txtime_ 16 Confirm 17 18 19 PlmeTx_ Time.confirm( 20 xtime) 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 90 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 Process Validate_MPDU validate_rx_2c(2) 4 5 Save time of Rx Rx_Frame end as reference 6 for start of IFS. 7 8 PhyRxData._ Accumulate PhyRxEnd._ Rts timeout 9 octet into Mpdu indication based on indication(v) 10 and CRC check. (status) rate of Rts. 11 Save arrival time pdu:= fcs:= endRx:= 12 of first octet of pdu // ftype(pdu) {what may be a} mkstring(v), crc32(fcs, v) now-D1 13 timestamp field. else (rts) 14 TxTime( 15 k= status sTsOctet sAckCtsLng/8, 16 rxRate, ackctstime) (true) (false) else (no_error) 17 18 dRts:=dUsec( startTs:= k:= k+1 k= 19 now-D1 rxLength (2*aSifsTime)+ (false) (2*aSlotTime)+ 20 (true) 21 k= sMaxMpdu_ protocol_ ackctstime) 22 Ver(pdu) Lng else 23 (false) (true) (=sVersion) 24 set 25 - Rx_Error fcs = goodCrc (now+dRts, (true) Trts) 26 (false) 27 PhyData.indicate PhyRxEnd._ cErr:= pdu:= substr (rxLength - 28 ignored to drop indication excess octets. (status) inc(cErr) (pdu, 0, sCrcLng)) 29 30 Save time of Rx Drop FCS field from 31 endRx:= export(cErr) UseDifs end as reference now-D1 (endRx) frame before passing 32 for start of IFS. up for filtering. 33 34 OptionImplemented dot11Privacy_ and wepBit(pdu) 35 (false) (true) 36 37 RxMpdu startTs, RxMpdu startTs,rxRate, UseEifs (pdu, rxRate, (pdu, wExclude,wDefault, 38 (endRx) endRx, ,,) endRx, wKeyMap) 39 40 Eifs based 41 mRxA:=false on the lowest basic rate. 42 Assumed to 43 be the first Indicate that element of 44 reception is export(mRxA) mBrates. not in progress. 45 46 47 Rx_Idle 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 91 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 Annex D: ASN.1 Encoding of the MAC and PHY Management Information Base (normative) 4 5 6 Add the following variables to the PHY MIB 7 8 dot11ShortPreambleOptionImplemented OBJECT-TYPE SYNTAX INTEGER TruthValue 9 MAX-ACCESS read-only 10 STATUS current 11 DESCRIPTION 12 "This attribute, when true, shall indicate that the short preamble option as defined in subclause 18.2.2.2 is implemented. 13 The default value of this attribute shall be false." := {dot11PhyHRDSSSEntry 1} 14 15 16 dot11PBCCOptionImplemented OBJECT-TYPE 17 SYNTAX TruthValue 18 MAX-ACCESS read-only STATUS current 19 DESCRIPTION 20 "This attribute, when true, shall indicate that the PBCC modulation option as defined in subclause 18.4.6.6 is imple- 21 mented. The default value of this attribute shall be false." 22 := {dot11PhyHRDSSSEntry 2} 23 24 dot11PhyOperationEntry:= SEQUENCE { 25 dot11PhyOperationGroupTableIndex Integer32, 26 dot11PHYType INTEGER, 27 dot11CurrentRegDomain Integer32, 28 dot11CCATime Integer32, 29 dot11MACProcessingDelay Integer32, dot11TempType INTEGER 30 dot11PhyOperationGroupRowStatus RowStatus, 31 32 33 dot11ChannelAgilityPresent OBJECT-TYPE 34 SYNTAX TruthValue MAX-ACCESS read-only 35 STATUS current 36 DESCRIPTION 37 "This attribute indicates that the PHY is capable of channel agility.” 38 ::= { dot11PhyHRDSSSEntry 3} 39 40 dot11ChannelAgilityEnabled OBJECT-TYPE 41 SYNTAX TruthValue 42 MAX-ACCESS read-only 43 STATUS current 44 DESCRIPTION "This attribute indicates that the PHY channel agility functionality is enabled.” 45 := {dot11PhyHRDSSSEntry 4 } 46 47 48 dot11HRCCAModeSupported OBJECT-TYPE 49 SYNTAX INTEGER (1..31) 50 MAX-ACCESS read-only 51 STATUS current 52 DESCRIPTION 53 "dot11HRCCAModeSupported is a bit-significant value, representing all of 54 55 Copyright © 2001 IEEE. All rights reserved . 92 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 the CCA modes supported by the PHY. Valid values are: 1 energy detect only (ED_ONLY) = 01, 2 carrier sense only (CS_ONLY) = 02, 3 carrier sense and energy detect (ED_and_CS)= 04 4 carrier sense with timer (CS_and_Timer)= 08 5 high rate carrier sense and energy detect (HRCS_and_ED)= 16 6 or the logical sum of any of these values. In the high rate extension PHY, this attribute shall be used in preference to the 7 dot11CCAModeSupported attribute." 8 ::= { dot11PhyHRDSSSEntry 5 } 9 10 11 12 13 Add a new compliance group to the compliance statements just before the section:“OPTIONAL- 14 GROUPS”: 15 16 17 GROUP dot11PhyHRDSSSComplianceGroup 18 DESCRIPTION 19 "Implementation of this group is required when object 20 dot11PHYType has the value of hrdsss. This group is 21 mutually exclusive with the groups dot11PhyDSSSComplianceGroup, 22 dot11PhyIRComplianceGroup and dot11PhyFHSSComplianceGroup." 23 24 25 26 Change the following attribute definition (as it was previously modified by 802.11a): 27 28 29 dot11PHYType OBJECT-TYPE 30 SYNTAX INTEGER {fhss(1), dsss(2), irbaseband(3), ofdm(4), hrdsss(5)} 31 MAX-ACCESS read-only 32 STATUS current 33 DESCRIPTION 34 "This is an 8-bit integer value that identifies the PHY type 35 supported by the attached PLCP and PMD. Currently defined 36 values and their corresponding PHY types are: 37 FHSS 2.4 GHz = 01 , DSSS 2.4 GHz = 02, IR Baseband = 03, 38 OFDM 5GHz = 04, HRDSSS = 05 " 39 ::= { dot11PhyOperationEntry 1 } 40 41 42 Modify the following compliance group in the compliance statements: 43 44 dot11CCAModeSupported OBJECT-TYPE 45 SYNTAX INTEGER (1..7) 46 MAX-ACCESS read-only 47 STATUS current 48 DESCRIPTION 49 "dot11CCAModeSupported is a bit-significant value, representing all of 50 the CCA modes supported by the PHY. Valid values are: 51 energy detect only (ED_ONLY) = 01, 52 carrier sense only (CS_ONLY) = 02, 53 carrier sense and energy detect (ED_and_CS)= 04 54 55 Copyright © 2001 IEEE. All rights reserved . 93 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 carrier sense with timer (CS_and_Timer)= 08 1 high rate carrier sense and energy detect (HRCS_and_ED)= 16 2 or the arithmetic sum of any of these values. This attribute shall 3 not be used to indicate the CCA modes supported by a higher rate extension PHY. Rather, the dot11HRCCAModeSupported attribute shall 4 be used to indicate the CCA modes of the higher rate extension PHY." 5 ::= { dot11PhyDSSSEntry 2 } 6 7 dot11CurrentCCAMode OBJECT-TYPE 8 SYNTAX INTEGER {edonly(1), csonly(2), edandcs(4), cswithtimer(8), 9 hrcsanded(16) } 10 MAX-ACCESS read-write 11 STATUS current 12 DESCRIPTION 13 "The current CCA method in operation. Valid values are: 14 energy detect only (edonly) = 01, 15 carrier sense only (csonly) = 02, 16 carrier sense and energy detect (edandcs)= 04. 17 carrier sense with timer (cswithtimer)= 08 18 high rate carrier sense and energy detect (hrcsanded)= 16" 19 ::= { dot11PhyDSSSEntry 3 } 20 21 22 23 Insert the following into the 802.11 MIB in Annex D, between the section entitled: “conformance infor- 24 mation” and the section entitled: “End of dot11SupportedDataRatesRx TABLE”: 25 26 -- ********************************************************************** 27 28 -- * dot11PhyHRDSSSEntry TABLE 29 30 -- ********************************************************************** 31 32 dot11PhyHRDSSSTable OBJECT-TYPE 33 SYNTAX SEQUENCE OF Dot11PhyHRDSSSEntry 34 MAX-ACCESS not-accessible 35 STATUS current DESCRIPTION 36 "Entry of attributes for dot11PhyHRDSSSEntry. Implemented as a table indexed on ifIndex to allow 37 for multiple instances on an Agent." 38 ::= { dot11phy 12 } 39 40 dot11PhyHRDSSSEntry OBJECT-TYPE 41 SYNTAX Dot11PhyHRDSSSEntry 42 MAX-ACCESS not-accessible 43 STATUS current 44 DESCRIPTION 45 "An entry in the dot11PhyHRDSSSEntry Table. ifIndex - Each 802.11 interface is represented by an 46 ifEntry. Interface tables in this MIB module are indexed by ifIndex." 47 INDEX {ifIndex} 48 ::= { dot11PhyHRDSSSTable 1 } 49 50 Dot11PhyHRDSSSEntry ::= SEQUENCE { dot11ShortPreambleOptionImplemented TruthValue, 51 dot11PBCCOptionImplemented TruthValue, 52 dot11ChannelAgilityPresent TruthValue, 53 dot11ChannelAgilityEnabled TruthValue, 54 55 Copyright © 2001 IEEE. All rights reserved . 94 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 dot11HRCCAModeSupported INTEGER } 1 2 3 -- ********************************************************************** 4 -- * End of dot11PhyHRDSSSEntry TABLE 5 -- ********************************************************************** 6 7 8 9 Insert the following text into the 802.11 MIB in Annex D, after the definition of the SMTBase2 Object 10 Group: 11 12 dot11PhyHRDSSSComplianceGroup OBJECT-GROUP 13 OBJECTS {dot11CurrentChannel, 14 dot11CCAModeSupported, 15 dot11CurrentCCAMode, 16 dot11EDThreshold, 17 dot11ShortPreambleOptionImplemented, 18 dot11PBCCOptionImplemented, 19 dot11ChannelAgilityPresent, 20 dot11ChannelAgilityEnabled, 21 dot11HRCCAModeSupported } 22 STATUS current 23 DESCRIPTION 24 "Attributes that configure the HRDSSS PHY for IEEE 802.11. Implementation of this group is required when object dot11PHYType has the value of hrdsss. This group is mutually exclusive with 25 the groups dot11PhyDSSSComplianceGroup, dot11PhyIRComplianceGroup and 26 dot11PhyFHSSComplianceGroup." 27 ::= { dot11Groups 19 } 28 29 30 Insert new annex. 31 32 Annex F - High Rate PHY / frequency hopping interoperability (Informative) 33 34 The channel agility option described in 18.4.6.7 provides for 802.11 FH PHY interoperability with the High 35 Rate PHY. The frequency hopping patterns as defined within this annex enable synchronization with an FH 36 PHY compliant BSS in North America and most of Europe. In addition, CCA requirements on a High Rate 37 station using this mode provides for CCA detection of 1 MHz wide FH signals within the wideband DS 38 channel selected. FH PHY stations operating in mixed mode FH/DS environments are advised to use similar 39 cross PHY CCA mechanisms. The frequency hopping (channel agility) and cross CCA mechanisms provide 40 the basic mechanisms to enable coexistence and interoperability. 41 42 The MAC elements include both DS and FH elements in beacons and probe responses when the channel 43 agility option is turned on. Added capability fields indicate the ability to support the channel agility option 44 and to indicate whether the option is turned on. These fields allow synchronization to the hopping sequence 45 and timing, identification of what modes are being used within a BSS when joining on either High Rate or 46 FHSS sides, and rejection of an association request in some cases. 47 48 Interoperability within an infrastructure BSS can be achieved, as an example, using a virtual dual Access 49 Point (AP). A virtual dual AP is defined, for purposes of discussion, as two logically separate APs that exist 50 within a single physical AP with a single radio (one transmit and one receive path). Both FHSS and High 51 Rate logical APs send out their own beacons and DTIMs and other non-directed packets. The two sides 52 interact in the sharing of the medium and the AP’s processor and radio. Addressing and association issues 53 may be handled in one of several ways and are left as an implementation choice. 54 55 Copyright © 2001 IEEE. All rights reserved . 95 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 Minimal interoperability with a non-hopping High Rate or legacy DSSS is provided by the use of a channel 1 at least 1/7 or more of the time. While throughput would be significantly reduced by having a channel only 2 1/7 of the time, connection and minimal throughput can be provided. 3 4 F.1 Additional CCA Recomendations 5 6 When the frequency hopping option is utilized, the HR/DSSS PHY should provide the CCA capability to 7 detect 1 MHz wide FH PHY signals operating within the wideband DS channel at levels 10 dB higher than 8 that specified in subclause 18.4.8.4 for wideband HR/DSSS signals. This is in addition to the primary CCA 9 requirements in subclause 18.4.8.4. A timeout mechanism to avoid excessive deferral to constant CW or 10 other non-802.11 type signals is allowed. 11 12 FH PHY stations operating in mixed environments should provide similar CCA mechanisms to detect 13 wideband DSSS signals at levels specified in clause 1.4.8.4 but measured within a 1 MHz bandwidth. Signal 14 levels measured in a full DSSS channel will be generally 10 dB or more higher. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 96 This is an unapproved IEEE Standards Draft, subject to change

IEEE HIGHER SPEED PHYSICAL LAYER IN THE 2.4 GHz BAND P802.11b/D8.0, Sept 2001 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Copyright © 2001 IEEE. All rights reserved . 97 This is an unapproved IEEE Standards Draft, subject to change


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