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【文件名】:06921@52RD_IEEE_std_802[1].11e.rar
【格 式】:rar
【大 小】:1833K
【简 介】:
【目 录】:Contents
1. Overview............................................................................................................................................... 1
1.2 Purpose....................................................................................................................................... 1
2. Normative references............................................................................................................................ 2
3. Definitions ............................................................................................................................................ 2
4. Abbreviations and acronyms ................................................................................................................. 6
5. General description ............................................................................................................................... 7
5.1 General description of the architecture ....................................................................................... 7
5.1.1 How wireless LAN systems are different ...................................................................... 7
5.1.1.2 The mMedia impact theon design and performance...................................... 7
5.1.1.4 Interaction with other IEEE 802® layers....................................................... 8
5.2 Components of the IEEE 802.11 architecture............................................................................. 8
5.2.5 QoS basic service set (QBSS): The QoS network ......................................................... 8
5.3 Logical service interfaces............................................................................................................ 9
5.3.1 Station service (SS)........................................................................................................ 9
5.3.2 Distribution system service (DSS)................................................................................. 9
5.4 Overview of the services............................................................................................................. 9
5.4.1 Distribution of messages within a DS.......................................................................... 10
5.4.1.3 QoS traffic scheduling ................................................................................. 10
5.4.2 Services that support the distribution service .............................................................. 10
5.4.2.2 Association................................................................................................... 10
5.4.5 Traffic differentiation and QoS support....................................................................... 10
5.4.6 Support for higher layer timer synchronization........................................................... 10
5.5 Relationships between services................................................................................................. 11
5.6 Differences between ESS and IBSS LANs............................................................................... 11
5.7 Message information contents that support the services........................................................... 11
5.7.1 Data............................................................................................................................. 11
5.7.2 Association................................................................................................................... 12
5.7.3 Reassociation ............................................................................................................... 12
6. MAC service definition ....................................................................................................................... 13
6.1 Overview of MAC services....................................................................................................... 13
6.1.1 Asynchronous dData service ....................................................................................... 13
6.1.1.1 Determination of UP.................................................................................... 13
6.1.1.2 Interpretation of priority parameter in MAC service primitives.................. 14
6.1.1.3 Interpretation of service class parameter in MAC service primitives
in a QSTA.................................................................................................... 14
6.1.3 MSDU ordering ........................................................................................................... 15
6.1.4 MAC data service architecture .................................................................................... 16
6.2 Detailed service specification ................................................................................................... 17
6.2.1 MAC data services....................................................................................................... 17
6.2.1.1 MA-UNITDATA.request ............................................................................ 17
6.2.1.2 MA-UNITDATA.indication ........................................................................ 17
6.2.1.3 MA-UNITDATA-STATUS.indication........................................................ 18
Copyright © 2005 IEEE. All rights reserved. xi
7. Frame formats ..................................................................................................................................... 18
7.1 MAC frame formats .................................................................................................................. 19
7.1.1 Conventions ................................................................................................................. 19
7.1.2 General frame format................................................................................................... 20
7.1.3 Frame fields ................................................................................................................. 20
7.1.3.1 Frame Control field...................................................................................... 20
7.1.3.2 Duration/ID field.......................................................................................... 23
7.1.3.4 Sequence Control field................................................................................. 23
7.1.3.5 QoS Control field......................................................................................... 24
7.1.3.6 7.1.3.5 Frame Body field ............................................................................. 28
7.1.3.7 7.1.3.6 FCS field .......................................................................................... 28
7.1.4 Duration/ID field in data and management frames...................................................... 28
7.2 Format of individual frame types.............................................................................................. 29
7.2.1 Control frames ............................................................................................................. 29
7.2.1.1 Request to Send (RTS) frame format .......................................................... 29
7.2.1.2 Clear to Send (CTS) frame format............................................................... 29
7.2.1.3 Acknowledgment (ACK) frame format....................................................... 30
7.2.1.7 Block Ack Request (BlockAckReq) frame format ...................................... 30
7.2.1.8 Block Ack (BlockAck) frame format .......................................................... 31
7.2.2 Data frames .................................................................................................................. 32
7.2.3 Management frames..................................................................................................... 34
7.2.3.1 Beacon frame format ................................................................................... 35
7.2.3.4 Association Request frame format............................................................... 36
7.2.3.5 Association Response frame format ............................................................ 36
7.2.3.6 Reassociation Request frame format ........................................................... 36
7.2.3.7 Reassociation Response frame format......................................................... 37
7.2.3.9 Probe Response frame format...................................................................... 37
7.3 Management frame body components ...................................................................................... 37
7.3.1 Fixed fields .................................................................................................................. 37
7.3.1.4 Capability Information field ........................................................................ 37
7.3.1.7 Reason Code field........................................................................................ 41
7.3.1.9 Status Code field.......................................................................................... 41
7.3.1.11 Action field .................................................................................................. 42
7.3.1.12 Dialog Token field ....................................................................................... 43
7.3.1.13 DLS Timeout Value field ............................................................................ 43
7.3.1.14 Block Ack Parameter Set field..................................................................... 43
7.3.1.15 Block Ack Timeout Value field................................................................... 44
7.3.1.16 DELBA Parameter Set field ........................................................................ 44
7.3.1.17 QoS Info field .............................................................................................. 45
7.3.2 Information elements ................................................................................................... 46
7.3.2.25 RSN information element ............................................................................ 47
7.3.2.26 QBSS Load element..................................................................................... 47
7.3.2.27 EDCA Parameter Set element...................................................................... 47
7.3.2.28 TSPEC element............................................................................................ 49
7.3.2.29 TCLAS element ........................................................................................... 54
7.3.2.30 TS Delay element......................................................................................... 56
7.3.2.31 TCLAS Processing element......................................................................... 56
7.3.2.32 Schedule element ......................................................................................... 57
7.3.2.33 QoS Capability element ............................................................................... 57
7.4 Action frame format details ...................................................................................................... 58
7.4.2 QoS Action frame details............................................................................................. 58
7.4.2.1 ADDTS Request frame format .................................................................... 58
7.4.2.2 ADDTS Response frame format.................................................................. 59
xii Copyright © 2005 IEEE. All rights reserved.
7.4.2.3 DELTS frame format ................................................................................... 60
7.4.2.4 Schedule frame format................................................................................. 60
7.4.3 DLS Action frame details ............................................................................................ 61
7.4.3.1 DLS Request frame format .......................................................................... 61
7.4.3.2 DLS Response frame format........................................................................ 62
7.4.3.3 DLS Teardown frame format....................................................................... 62
7.4.4 Block Ack Action frame details................................................................................... 63
7.4.4.1 ADDBA Request frame format ................................................................... 63
7.4.4.2 ADDBA Response frame format................................................................. 64
7.4.4.3 DELBA frame format .................................................................................. 65
7.5 Frame usage .............................................................................................................................. 65
8. Security ............................................................................................................................................... 67
8.3 RSNA data confidentiality protocols ........................................................................................ 67
8.3.2 Temporal Key Integrity Protocol (TKIP) .................................................................... 67
8.3.2.3 TKIP MIC.................................................................................................... 67
8.3.2.6 TKIP replay protection procedures.............................................................. 68
8.3.3 CTR with CBC-MAC Protocol (CCMP)..................................................................... 68
8.3.3.3 CCMP encapsulation ................................................................................... 68
8.3.3.4 CCMP decapsulation ................................................................................... 69
8.4 RSNA security association management .................................................................................. 69
8.4.1 Security associations.................................................................................................... 69
8.4.1.1 Security association definitions ................................................................... 69
8.5 Keys and key distribution ......................................................................................................... 69
8.5.2 EAPOL-Key frames..................................................................................................... 69
8.5.5 STAKey Handshake .................................................................................................... 70
8.5.5.1 STAKey Request message........................................................................... 70
9. MAC sublayer functional description.................................................................................................. 70
9.1 MAC architecture..................................................................................................................... 70
9.1.3 Hybrid coordination function (HCF) ........................................................................... 71
9.1.3.1 HCF contention-based channel access (EDCA) .......................................... 71
9.1.3.2 HCF controlled channel access (HCCA) ..................................................... 73
9.1.4 9.1.3 Coexistence of DCF, and PCF, and HCF ........................................................... 73
9.1.5 9.1.4 Fragmentation/defragmentation overview.......................................................... 74
9.1.6 9.1.5 MAC data service ............................................................................................... 74
9.2 DCF.......................................................................................................................................... 75
9.2.3 Interframe space (IFS) ................................................................................................. 75
9.2.3.4 Arbitration IFS (AIFS)................................................................................. 76
9.2.3.5 9.2.3.4 EIFS ................................................................................................. 76
9.2.5 DCF access procedure ................................................................................................. 76
9.2.5.2 Backoff procedure for DCF ......................................................................... 76
9.2.9 Duplicate detection and recovery ................................................................................ 77
9.6 Multirate support....................................................................................................................... 77
9.7 9.8 MSDU transmission restrictions ......................................................................................... 78
9.8 9.9 Operation across regulatory domains.................................................................................. 79
9.9 HCF.......................................................................................................................................... 79
9.9.1 HCF contention-based channel access (EDCA) .......................................................... 80
9.9.1.1 Reference Implementation........................................................................... 80
9.9.1.2 EDCA TXOPs.............................................................................................. 80
9.9.1.3 Obtaining an EDCA TXOP ......................................................................... 81
9.9.1.4 Multiple frame transmission in an EDCA TXOP........................................ 83
Copyright © 2005 IEEE. All rights reserved. xiii
9.9.1.5 EDCA backoff procedure ............................................................................ 84
9.9.1.6 Retransmit procedures ................................................................................. 84
9.9.2 HCCA .......................................................................................................................... 85
9.9.2.1 HCCA procedure ......................................................................................... 86
9.9.2.2 TXOP structure and timing.......................................................................... 88
9.9.2.3 HCCA transfer rules .................................................................................... 90
9.9.3 Admission Control at the HC....................................................................................... 92
9.9.3.1 Contention-based admission control procedures ......................................... 92
9.9.3.2 Controlled-access admission control ........................................................... 94
9.10 Block Acknowledgment (Block Ack)....................................................................................... 96
9.10.1 Introduction.................................................................................................................. 96
9.10.2 Setup and modification of the Block Ack parameters ................................................. 96
9.10.3 Data and acknowledgment transfer.............................................................................. 97
9.10.4 Receive buffer operation............................................................................................ 100
9.10.5 Teardown of the Block Ack mechanism.................................................................... 100
9.11 No Acknowledgment (No Ack) .............................................................................................. 101
9.12 9.7 Frame exchange sequences ............................................................................................... 101
9.13 9.10 Protection mechanism..................................................................................................... 108
10. Layer management............................................................................................................................ 109
10.3 MLME SAP interface ............................................................................................................. 109
10.3.2 Scan........................................................................................................................... 109
10.3.2.2 MLME-SCAN.confirm.............................................................................. 109
10.3.6 Associate.................................................................................................................... 109
10.3.6.1 MLME-ASSOCIATE.request.................................................................... 109
10.3.6.2 MLME-ASSOCIATE.confirm .................................................................. 110
10.3.6.3 MLME-ASSOCIATE.indication ............................................................... 110
10.3.7 Reassociate................................................................................................................. 111
10.3.7.1 MLME-REASSOCIATE.request .............................................................. 111
10.3.7.2 MLME-REASSOCIATIE.confirm ............................................................ 111
10.3.7.3 MLME-REASSOCIATE.indication .......................................................... 112
10.3.10 Start........................................................................................................................... 112
10.3.10.1 MLME-START.request............................................................................. 112
10.3.24 TS management interface .......................................................................................... 113
10.3.24.1 MLME-ADDTS.request ............................................................................ 113
10.3.24.2 MLME-ADDTS.confirm ........................................................................... 114
10.3.24.3 MLME-ADDTS.indication........................................................................ 116
10.3.24.4 MLME-ADDTS.response.......................................................................... 117
10.3.24.5 MLME-DELTS.request ............................................................................. 118
10.3.24.6 MLME-DELTS.confirm ............................................................................ 119
10.3.24.7 MLME-DELTS.indication......................................................................... 120
10.3.25 Management of direct links ....................................................................................... 121
10.3.25.1 MLME-DLS.request .................................................................................. 121
10.3.25.2 MLME-DLS.confirm................................................................................. 122
10.3.25.3 MLME-DLS.indication.............................................................................. 123
10.3.25.4 MLME-DLSTeardown.request.................................................................. 123
10.3.25.5 MLME-DLSTeardown.confirm................................................................. 124
10.3.25.6 MLME-DLSTeardown.indication ............................................................. 125
10.3.26 Higher layer synchronization support........................................................................ 125
10.3.26.1 MLME-HL-SYNC.request ........................................................................ 126
10.3.26.2 MLME-HL-SYNC.confirm ....................................................................... 126
10.3.26.3 MLME-HL-SYNC.indication.................................................................... 127
10.3.27 Block Ack .................................................................................................................. 127
xiv Copyright © 2005 IEEE. All rights reserved.
10.3.27.1 MLME-ADDBA.request ........................................................................... 128
10.3.27.2 MLME-ADDBA.confirm .......................................................................... 129
10.3.27.3 MLME-ADDBA.indication....................................................................... 130
10.3.27.4 MLME-ADDBA.response......................................................................... 130
10.3.27.5 MLME-DELBA.request ............................................................................ 131
10.3.27.6 MLME-DELBA.confirm ........................................................................... 132
10.3.27.7 MLME-DELBA.indication........................................................................ 133
10.3.28 Schedule element management.................................................................................. 134
10.3.28.1 MLME-SCHEDULE.request..................................................................... 134
10.3.28.2 MLME-SCHEDULE.confirm.................................................................... 135
10.3.28.3 MLME-SCHEDULE.indication ................................................................ 135
11. MAC sublayer management entity (MLME)..................................................................................... 136
11.2 Power management ................................................................................................................. 136
11.2.1 Power management in an infrastructure network ...................................................... 136
11.2.1.4 Power management with APSD ................................................................ 136
11.2.1.5 11.2.1.4 AP operation during the CP......................................................... 138
11.2.1.6 11.2.1.5 AP operation during the CFP....................................................... 140
11.2.1.7 11.2.1.6 Receive operation for STAs in PS mode during the CP.............. 140
11.2.1.8 11.2.1.7 Receive operation for STAs in PS mode during the CFP............ 141
11.2.1.9 Receive operation for non-AP QSTAs using APSD ................................. 141
11.2.1.10 11.2.1.8 STAs operating in the Active mode............................................. 141
11.2.1.11 11.2.1.9 AP aging function ........................................................................ 141
11.2.2 Power management in an IBSS ................................................................................. 141
11.4 TS operation........................................................................................................................... 141
11.4.1 Introduction................................................................................................................ 141
11.4.2 TSPEC construction................................................................................................... 142
11.4.3 TS lifecycle ................................................................................................................ 142
11.4.4 TS setup ..................................................................................................................... 143
11.4.5 Failed TS setup .......................................................................................................... 145
11.4.6 Data transfer............................................................................................................... 145
11.4.7 TS deletion................................................................................................................. 146
11.4.8 TS timeout.................................................................................................................. 146
11.4.9 TS suspension ............................................................................................................ 148
11.4.10 TS Reinstatement....................................................................................................... 148
11.5 Block Ack operation ............................................................................................................... 148
11.5.1 Setup and modification of the Block Ack parameters ............................................... 148
11.5.1.1 Procedure at the originator......................................................................... 148
11.5.1.2 Procedure at the recipient .......................................................................... 149
11.5.2 Teardown of the Block Ack mechanism.................................................................... 149
11.5.2.1 Procedure at the initiator of the Block Ack teardown ............................... 150
11.5.2.2 Procedure at the recipient of the DELBA frame........................................ 150
11.5.3 Error recovery upon a peer failure............................................................................. 150
11.6 Higher layer timer synchronization......................................................................................... 152
11.6.1 Introduction................................................................................................................ 152
11.6.2 Procedure at the QSTA.............................................................................................. 152
11.7 DLS operation ......................................................................................................................... 153
11.7.1 DLS............................................................................................................................ 154
11.7.1.1 Setup procedure at the QSTA .................................................................... 154
11.7.1.2 Setup procedure at the QAP....................................................................... 155
11.7.2 Data transfer after setup............................................................................................. 155
11.7.3 DLS teardown ............................................................................................................ 155
11.7.3.1 Teardown procedure at the QSTA ............................................................. 156
Copyright © 2005 IEEE. All rights reserved. xv
11.7.3.2 Teardown procedure at the QAP ............................................................... 156
11.7.4 Error recovery upon a peer failure............................................................................. 157
11.7.5 Secure DLS operation................................................................................................ 158
11.8 11.4 Association, reassociation, and disassociation................................................................ 158
11.8.1 11.4.1 STA association procedures............................................................................ 158
11.8.2 11.4.2 AP association procedures .............................................................................. 158
11.8.3 11.4.3 STA reassociation procedures ........................................................................ 158
11.8.4 11.4.4 AP reassociation procedures........................................................................... 158
11.8.5 11.4.5 STA disassociation procedures....................................................................... 158
11.8.6 11.4.6 AP disassociation procedures ......................................................................... 158
11.9 11.5 TPC procedures............................................................................................................... 158
11.9.1 11.5.1 Association based on transmit power capability............................................. 158
11.9.2 11.5.2 Specification of regulatory and local maximum transmit power levels ......... 158
11.9.3 11.5.3 Selection of a transmit power ......................................................................... 158
11.9.4 11.5.4 Adaptation of the transmit power ................................................................... 158
11.10 11.6 DFS procedures............................................................................................................... 158
11.10.1 11.6.1 Association based on supported channels....................................................... 158
11.10.2 11.6.2 Quieting channels for testing .......................................................................... 158
11.10.3 11.6.3 Testing channels for radars ............................................................................. 158
11.10.4 11.6.4 Discontinuing operations after detecting radars ............................................. 158
11.10.5 11.6.5 Detecting radars .............................................................................................. 158
11.10.6 11.6.6 Requesting and reporting of measurements.................................................... 159
11.10.7 11.6.7 Selecting and advertising a new channel ........................................................ 159
11.10.7.1 11.6.7.1 Selecting and advertising a new channel
in an infrastructure BSS............................................................................. 159
11.10.7.2 11.6.7.2 Selecting and advertising a new channel in an IBSS................... 159
Annex A (normative) Protocol Implementation Conformance Statement (PICS) proforma ...................... 160
A.4 PICS proforma ................................................................................................................. 160
A.4.3 Implementation under test (IUT) configuration ................................................. 160
A.4.14 QoS base functionality ....................................................................................... 160
A.4.15 QoS enhanced distributed channel access (EDCA) ........................................... 160
A.4.16 QoS hybrid coordination function (HCF) controlled channel access (HCCA).. 161
Annex C (normative) Formal description of MAC operation ..................................................................... 162
C.3 State machines for MAC.................................................................................................. 162
C.4 State machines for MAC AP ........................................................................................... 162
Annex D (normative) ASN.1 encoding of the MAC and PHY MIB........................................................... 163
Annex E (informative) Bibliography........................................................................................................... 182
E.1 General............................................................................................................................ 182
Annex K (informative) Admission control.................................................................................................. 183
K.1 Example use of TSPEC for admission control ................................................................ 183
K.2 Recommended practices for contention-based admission control................................... 184
K.2.1 Use of ACM (admission control mandatory) subfield ....................................... 184
K.2.2 Deriving medium time ....................................................................................... 184
K.3 Guidelines and reference design for sample scheduler and admission control unit ........ 185
K.3.1 Guidelines for deriving service schedule parameters......................................... 185
xvi Copyright © 2005 IEEE. All rights reserved.
K.3.2 TSPEC construction ........................................................................................... 185
K.3.3 Reference design for sample scheduler and admission control unit .................. 187
K.3.3.1 Sample scheduler ................................................................................ 187
K.3.3.2 Admission control unit........................................................................ 189
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