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首页IEEE 802.11-2012:无线局域网MAC与PHY层规范
"802.11-2012是Wi-Fi联盟分享的无线局域网(WLAN)协议,由IEEE LAN/MAN标准委员会赞助。该标准详细定义了无线局域网介质访问控制(MAC)层和物理层(PHY)规范。"
《802.11-2012:无线局域网介质访问控制(MAC)和物理层(PHY)规格》是 IEEE 为信息技术、电信和系统间的信息交换制定的特定要求标准。这个标准是对2007年版802.11标准的修订,由IEEE计算机学会的局域/城域网络标准委员会批准,旨在规范和提升无线局域网的性能和互操作性。
802.11标准是无线局域网通信的基础,包括了一系列的协议和技术,如802.11a/b/g/n/ac等,它们在不同的频率和传输速率下工作,为家庭、办公室和公共场所提供无线连接。802.11-2012版本主要关注的是MAC层和PHY层的详细规定,这两个层次是无线通信的核心部分。
1. **MAC层**:
- MAC层是负责管理设备如何共享无线信道的部分,包括访问控制、流量控制、错误检测和纠正、以及与其他设备的同步。802.11-2012可能包含对载波侦听多路访问/冲突避免(CSMA/CA)机制的改进,以降低网络拥堵和提高效率。
- 此外,MAC层还包括认证、授权和加密机制,如Wi-Fi保护访问(WPA/WPA2),确保无线通信的安全性。
2. **PHY层**:
- PHY层处理无线信号的物理传输,包括调制、编码、解码和频率选择。802.11-2012可能会涉及新的调制技术,如正交频分复用(OFDM)和多输入多输出(MIMO),这些技术提高了数据传输速率和信号覆盖范围。
- 同时,PHY层还规定了不同频段(如2.4GHz和5GHz)的使用,以及对各种无线环境的适应性,如信道选择和信噪比的管理。
此标准的修订通常涉及性能提升、兼容性增强和新功能的引入,以满足不断增长的无线数据需求。例如,802.11n引入了MIMO技术,显著提升了无线网络的速度;而后的802.11ac则进一步提升了速度,并优化了多设备同时连接的能力。
802.11-2012的实施对于网络管理员、硬件制造商以及普通用户来说都至关重要,因为它确保了不同厂商设备之间的互操作性,同时保持了网络的稳定性和安全性。通过遵循这一标准,无线设备能够在各种环境中提供可靠的连接,为用户提供无缝的上网体验。
xiv Copyright © 2012 IEEE. All rights reserved.
5.1.4 MSDU format .......................................................................................................... 95
5.1.5 MAC data service architecture ................................................................................ 95
5.2 MAC data service specification...............................................................................................97
5.2.1 General..................................................................................................................... 97
5.2.2 MA-UNITDATA.request ........................................................................................ 97
5.2.2.1 Function ................................................................................................ 97
5.2.2.2 Semantics of the service primitive........................................................ 97
5.2.2.3 When generated..................................................................................... 97
5.2.2.4 Effect of receipt..................................................................................... 98
5.2.3 MA-UNITDATA.indication .................................................................................... 99
5.2.3.1 Function ................................................................................................ 99
5.2.3.2 Semantics of the service primitive........................................................ 99
5.2.3.3 When generated................................................................................... 100
5.2.3.4 Effect of receipt................................................................................... 100
5.2.4 MA-UNITDATA-STATUS.indication.................................................................. 101
5.2.4.1 Function .............................................................................................. 101
5.2.4.2 Semantics of the service primitive...................................................... 102
5.2.4.3 When generated................................................................................... 103
5.2.4.4 Effect of receipt................................................................................... 103
6. Layer management............................................................................................................................. 104
6.1 Overview of management model........................................................................................... 104
6.2 Generic management primitives ............................................................................................ 105
6.3 MLME SAP interface ............................................................................................................ 105
6.3.1 Introduction............................................................................................................ 105
6.3.2 Power management................................................................................................ 106
6.3.2.1 Introduction......................................................................................... 106
6.3.2.2 MLME-POWERMGT.request............................................................ 106
6.3.2.3 MLME-POWERMGT.confirm........................................................... 106
6.3.3 Scan........................................................................................................................ 107
6.3.3.1 Introduction......................................................................................... 107
6.3.3.2 MLME-SCAN.request ........................................................................ 107
6.3.3.3 MLME-SCAN.confirm ....................................................................... 109
6.3.4 Synchronization ..................................................................................................... 115
6.3.4.1 Introduction......................................................................................... 115
6.3.4.2 MLME-JOIN.request .......................................................................... 115
6.3.4.3 MLME-JOIN.confirm......................................................................... 117
6.3.5 Authenticate ........................................................................................................... 117
6.3.5.1 Introduction......................................................................................... 117
6.3.5.2 MLME-AUTHENTICATE.request .................................................... 117
6.3.5.3 MLME-AUTHENTICATE.confirm ................................................... 118
6.3.5.4 MLME-AUTHENTICATE.indication................................................ 119
6.3.5.5 MLME-AUTHENTICATE.response.................................................. 120
6.3.6 Deauthenticate ....................................................................................................... 121
6.3.6.1 Introduction......................................................................................... 121
6.3.6.2 MLME-DEAUTHENTICATE.request............................................... 121
6.3.6.3 MLME-DEAUTHENTICATE.confirm.............................................. 122
6.3.6.4 MLME-DEAUTHENTICATE.indication .......................................... 123
6.3.7 Associate................................................................................................................ 123
6.3.7.1 Introduction......................................................................................... 123
6.3.7.2 MLME-ASSOCIATE.request............................................................. 123
6.3.7.3 MLME-ASSOCIATE.confirm............................................................ 125
6.3.7.4 MLME-ASSOCIATE.indication ........................................................ 128
Copyright © 2012 IEEE. All rights reserved. xv
6.3.7.5 MLME-ASSOCIATE.response .......................................................... 130
6.3.8 Reassociate............................................................................................................. 133
6.3.8.1 Introduction......................................................................................... 133
6.3.8.2 MLME-REASSOCIATE.request........................................................ 133
6.3.8.3 MLME-REASSOCIATE.confirm....................................................... 135
6.3.8.4 MLME-REASSOCIATE.indication ................................................... 138
6.3.8.5 MLME-REASSOCIATE.response ..................................................... 141
6.3.9 Disassociate ........................................................................................................... 144
6.3.9.1 MLME-DISASSOCIATE.request ...................................................... 144
6.3.9.2 MLME-DISASSOCIATE.confirm ..................................................... 145
6.3.9.3 MLME-DISASSOCIATE.indication.................................................. 146
6.3.10 Reset....................................................................................................................... 146
6.3.10.1 Introduction......................................................................................... 146
6.3.10.2 MLME-RESET.request....................................................................... 146
6.3.11 Start........................................................................................................................ 147
6.3.11.1 Introduction......................................................................................... 147
6.3.11.2 MLME-START.request ...................................................................... 147
6.3.11.3 MLME-START.confirm..................................................................... 151
6.3.12 Stop ........................................................................................................................ 152
6.3.12.1 General................................................................................................ 152
6.3.12.2 MLME-STOP.request......................................................................... 152
6.3.13 Protocol layer model for spectrum management and radio measurement............. 153
6.3.14 Measurement request ............................................................................................. 156
6.3.14.1 Introduction......................................................................................... 156
6.3.14.2 MLME-MREQUEST.request ............................................................. 156
6.3.14.3 MLME-MREQUEST.indication......................................................... 157
6.3.15 Channel measurement............................................................................................ 158
6.3.15.1 Introduction......................................................................................... 158
6.3.15.2 MLME-MEASURE.request................................................................ 158
6.3.15.3 MLME-MEASURE.confirm............................................................... 158
6.3.16 Measurement report ............................................................................................... 159
6.3.16.1 Introduction......................................................................................... 159
6.3.16.2 MLME-MREPORT.request................................................................ 159
6.3.16.3 MLME-MREPORT.indication ........................................................... 160
6.3.17 Channel switch....................................................................................................... 161
6.3.17.1 MLME-CHANNELSWITCH.request ................................................ 161
6.3.17.2 MLME-CHANNELSWITCH.confirm ............................................... 162
6.3.17.3 MLME-CHANNELSWITCH.indication............................................ 163
6.3.17.4 MLME-CHANNELSWITCH.response.............................................. 164
6.3.18 TPC request............................................................................................................ 164
6.3.18.1 Introduction......................................................................................... 164
6.3.18.2 MLME-TPCADAPT.request .............................................................. 165
6.3.18.3 MLME-TPCADAPT.confirm............................................................. 165
6.3.19 SetKeys .................................................................................................................. 166
6.3.19.1 MLME-SETKEYS.request ................................................................. 166
6.3.20 DeleteKeys............................................................................................................. 167
6.3.20.1 MLME-DELETEKEYS.request ......................................................... 167
6.3.21 MIC (Michael) failure event .................................................................................. 168
6.3.21.1 MLME-MICHAELMICFAILURE.indication.................................... 168
6.3.22 EAPOL................................................................................................................... 169
6.3.22.1 MLME-EAPOL.request...................................................................... 169
6.3.22.2 MLME-EAPOL.confirm..................................................................... 169
6.3.23 MLME-PeerKeySTART........................................................................................ 170
6.3.23.1 MLME- PeerKeySTART.request ....................................................... 170
xvi Copyright © 2012 IEEE. All rights reserved.
6.3.24 SetProtection.......................................................................................................... 171
6.3.24.1 MLME-SETPROTECTION.request................................................... 171
6.3.25 MLME-PROTECTEDFRAMEDROPPED ........................................................... 172
6.3.25.1 MLME- PROTECTEDFRAMEDROPPED.indication ...................... 172
6.3.26 TS management interface ...................................................................................... 172
6.3.26.1 General................................................................................................ 172
6.3.26.2 MLME-ADDTS.request ..................................................................... 173
6.3.26.3 MLME-ADDTS.confirm .................................................................... 174
6.3.26.4 MLME-ADDTS.indication................................................................. 176
6.3.26.5 MLME-ADDTS.response................................................................... 177
6.3.26.6 MLME-DELTS.request ...................................................................... 179
6.3.26.7 MLME-DELTS.indication.................................................................. 180
6.3.27 Management of direct links ................................................................................... 181
6.3.27.1 Introduction......................................................................................... 181
6.3.27.2 MLME-DLS.request ........................................................................... 181
6.3.27.3 MLME-DLS.confirm .......................................................................... 182
6.3.27.4 MLME-DLS.indication....................................................................... 183
6.3.27.5 MLME-DLSTeardown.request........................................................... 184
6.3.27.6 MLME-DLSTeardown.indication....................................................... 185
6.3.28 Higher layer synchronization support.................................................................... 186
6.3.28.1 Introduction......................................................................................... 186
6.3.28.2 MLME-HL-SYNC.request ................................................................. 186
6.3.28.3 MLME-HL-SYNC.indication............................................................. 186
6.3.29 Block Ack .............................................................................................................. 187
6.3.29.1 General................................................................................................ 187
6.3.29.2 MLME-ADDBA.request..................................................................... 187
6.3.29.3 MLME-ADDBA.confirm ................................................................... 188
6.3.29.4 MLME-ADDBA.indication ................................................................ 189
6.3.29.5 MLME-ADDBA.response .................................................................. 190
6.3.29.6 MLME-DELBA.request ..................................................................... 191
6.3.29.7 MLME-DELBA.indication................................................................. 192
6.3.30 Schedule element management.............................................................................. 193
6.3.30.1 Introduction......................................................................................... 193
6.3.30.2 MLME-SCHEDULE.request.............................................................. 193
6.3.30.3 MLME-SCHEDULE.indication ......................................................... 193
6.3.31 Vendor-specific action........................................................................................... 194
6.3.31.1 Introduction......................................................................................... 194
6.3.31.2 MLME-VSPECIFIC.request............................................................... 194
6.3.31.3 MLME-VSPECIFIC.indication .......................................................... 195
6.3.32 Neighbor report request ......................................................................................... 196
6.3.32.1 General................................................................................................ 196
6.3.32.2 MLME-NEIGHBORREPREQ.request............................................... 196
6.3.32.3 MLME-NEIGHBORREPREQ.indication .......................................... 197
6.3.33 Neighbor report response....................................................................................... 198
6.3.33.1 General................................................................................................ 198
6.3.33.2 MLME-NEIGHBORREPRESP.request ............................................. 198
6.3.33.3 MLME-NEIGHBORREPRESP.indication......................................... 199
6.3.34 Link Measure Request ........................................................................................... 199
6.3.34.1 General................................................................................................ 199
6.3.34.2 MLME-LINKMEASURE.request ...................................................... 200
6.3.34.3 MLME-LINKMEASURE.confirm..................................................... 200
6.3.35 MLME SAP interface for resource request ........................................................... 202
6.3.35.1 MLME-RESOURCE-REQUEST.request........................................... 202
6.3.35.2 MLME-RESOURCE-REQUEST.indication ...................................... 202
Copyright © 2012 IEEE. All rights reserved. xvii
6.3.35.3 MLME-RESOURCE-REQUEST.response ........................................ 203
6.3.35.4 MLME-RESOURCE-REQUEST.confirm ......................................... 204
6.3.35.5 MLME-RESOURCE-REQUEST-LOCAL.request............................ 204
6.3.35.6 MLME-RESOURCE-REQUEST-LOCAL.confirm........................... 205
6.3.36 MLME SAP interface for remote requests ............................................................ 206
6.3.36.1 MLME-REMOTE-REQUEST.request............................................... 206
6.3.36.2 MLME-REMOTE-REQUEST.indication........................................... 206
6.3.37 Extended channel switch announcement ............................................................... 207
6.3.37.1 General................................................................................................ 207
6.3.37.2 MLME-EXTCHANNELSWITCH.request......................................... 207
6.3.37.3 MLME-EXTCHANNELSWITCH.confirm ....................................... 208
6.3.37.4 MLME-EXTCHANNELSWITCH.indication .................................... 209
6.3.37.5 MLME-EXTCHANNELSWITCH.response ...................................... 210
6.3.38 DSE power constraint announcement.................................................................... 210
6.3.38.1 General................................................................................................ 210
6.3.38.2 MLME-DSETPC.request.................................................................... 211
6.3.38.3 MLME-DSETPC.confirm................................................................... 211
6.3.38.4 MLME-DSETPC.indication ............................................................... 212
6.3.38.5 MLME-DSETPC.response ................................................................. 213
6.3.39 Enablement ............................................................................................................ 214
6.3.39.1 General................................................................................................ 214
6.3.39.2 MLME-ENABLEMENT.request........................................................ 214
6.3.39.3 MLME-ENABLEMENT.confirm....................................................... 215
6.3.39.4 MLME-ENABLEMENT.indication ................................................... 216
6.3.39.5 MLME-ENABLEMENT.response ..................................................... 217
6.3.40 Deenablement ........................................................................................................ 218
6.3.40.1 MLME-DEENABLEMENT.request .................................................. 218
6.3.40.2 MLME-DEENABLEMENT.indication.............................................. 219
6.3.41 SA Query support .................................................................................................. 220
6.3.41.1 MLME-SAQuery.request.................................................................... 220
6.3.41.2 MLME-SAQuery.confirm................................................................... 220
6.3.41.3 MLME-SAQuery.indication ............................................................... 221
6.3.41.4 MLME-SAQuery.response ................................................................. 221
6.3.42 Get TSF timer ........................................................................................................ 222
6.3.42.1 General................................................................................................ 222
6.3.42.2 MLME-GETTSFTIME.request .......................................................... 222
6.3.42.2 MLME-GETTSFTIME.confirm ......................................................... 223
6.3.43 Timing Advertisement .......................................................................................... 223
6.3.43.1 General................................................................................................ 223
6.3.43.2 MLME-TIMING_ADVERTISEMENT.request................................. 223
6.3.43.3 MLME-TIMING_ADVERTISEMENT.indication ............................ 224
6.3.44 TDLS Discovery .................................................................................................... 226
6.3.44.1 General................................................................................................ 226
6.3.44.2 MLME-TDLSDISCOVERY.request.................................................. 226
6.3.44.3 MLME-TDLSDISCOVERY.confirm................................................. 226
6.3.44.4 MLME-TDLSDISCOVERY.indication ............................................. 227
6.3.44.5 MLME-TDLSDISCOVERY.response ............................................... 228
6.3.45 TDLS direct-link establishment............................................................................. 229
6.3.45.1 General................................................................................................ 229
6.3.45.2 MLME-TDLSSETUPREQUEST.request........................................... 230
6.3.45.3 MLME-TDLSSETUPREQUEST.indication ...................................... 230
6.3.45.4 MLME-TDLSSETUPRESPONSE.request......................................... 231
6.3.45.5 MLME-TDLSSETUPRESPONSE.indication .................................... 231
6.3.45.6 MLME-TDLSSETUPCONFIRM.request .......................................... 232
xviii Copyright © 2012 IEEE. All rights reserved.
6.3.45.7 MLME-TDLSSETUPCONFIRM.indication...................................... 232
6.3.45.8 MLME-TDLSPOTENTIALPEERSTA.request ................................. 233
6.3.45.9 MLME-TDLSPOTENTIALPEERSTA.confirm ................................ 234
6.3.46 TDLS direct-link teardown.................................................................................... 235
6.3.46.1 General................................................................................................ 235
6.3.46.2 MLME-TDLSTEARDOWN.request.................................................. 235
6.3.46.3 MLME-TDLSTEARDOWN.indication ............................................. 236
6.3.47 TDLS Peer U-APSD.............................................................................................. 237
6.3.47.1 General................................................................................................ 237
6.3.47.2 MLME-TDLSPTI.request................................................................... 237
6.3.47.3 MLME-TDLSPTI.confirm.................................................................. 238
6.3.47.4 MLME-TDLSPTI.indication .............................................................. 239
6.3.47.5 MLME-TDLSPTI.response ................................................................ 239
6.3.48 TDLS channel switching ....................................................................................... 240
6.3.48.1 General................................................................................................ 240
6.3.48.2 MLME-TDLSCHANNELSWITCH.request ...................................... 241
6.3.48.3 MLME-TDLSCHANNELSWITCH.confirm ..................................... 241
6.3.48.4 MLME-TDLSCHANNELSWITCH.indication.................................. 242
6.3.48.5 MLME-TDLSCHANNELSWITCH.response.................................... 243
6.3.49 TDLS Peer PSM .................................................................................................... 244
6.3.49.1 General................................................................................................ 244
6.3.49.2 MLME-TDLSPEERPSM.request....................................................... 244
6.3.49.3 MLME-TDLSPEERPSM.confirm...................................................... 245
6.3.49.4 MLME-TDLSPEERPSM.indication................................................... 246
6.3.49.5 MLME-TDLSPEERPSM.response..................................................... 246
6.3.50 Event request.......................................................................................................... 247
6.3.50.1 General................................................................................................ 247
6.3.50.2 MLME-EVLREQUEST.request......................................................... 248
6.3.50.3 MLME-EVLREQUEST.indication..................................................... 248
6.3.51 Event report............................................................................................................ 249
6.3.51.1 General................................................................................................ 249
6.3.51.2 MLME-EVLREPORT.request............................................................ 249
6.3.51.3 MLME-EVLREPORT.indication ....................................................... 250
6.3.52 Event ..................................................................................................................... 250
6.3.52.1 General................................................................................................ 250
6.3.52.2 MLME-EVLOG.request ..................................................................... 250
6.3.52.3 MLME-EVLOG.confirm .................................................................... 251
6.3.53 Diagnostic request.................................................................................................. 252
6.3.53.1 General................................................................................................ 252
6.3.53.2 MLME-DIAGREQUEST.request....................................................... 252
6.3.53.3 MLME-DIAGREQUEST.indication .................................................. 253
6.3.54 Diagnostic report.................................................................................................... 254
6.3.54.1 MLME-DIAGREPORT.request ......................................................... 254
6.3.54.2 MLME-DIAGREPORT.indication..................................................... 254
6.3.55 Location Configuration request ............................................................................. 255
6.3.55.1 General................................................................................................ 255
6.3.55.2 MLME-LOCATIONCFG.request....................................................... 256
6.3.55.3 MLME-LOCATIONCFG.confirm ..................................................... 256
6.3.55.4 MLME-LOCATIONCFG.indication .................................................. 257
6.3.55.5 MLME-LOCATIONCFG.response .................................................... 258
6.3.56 Location track notification..................................................................................... 259
6.3.56.1 General................................................................................................ 259
6.3.56.2 MLME-LOCATIONTRACKNOTIF.request..................................... 259
6.3.56.3 MLME-LOCATIONTRACKNOTIF.indication................................. 260
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