Draft P802.11s_D12.0 Mesh Networking.pdf

【核心代码】

Contents
1. Overview.................................................................................................................................................... 2
1.2 Purpose......................................................................................................................................... 2
2. Normative references................................................................................................................................. 2
3. Definitions ................................................................................................................................................. 2
3A.Definitions specific to IEEE Std 802.11.................................................................................................... 5
4. Abbreviations and acronyms ..................................................................................................................... 5
5. General description .................................................................................................................................... 7
5.2 Components of the IEEE 802.11 architecture ............................................................................. 7
5.2.2 STA membership in a BSS is dynamic........................................................................ 7
5.2.3 Distribution system (DS) concepts .............................................................................. 7
5.2.3.1 Extended service set (ESS): The large coverage network ....................... 7
5.2.6 QoS BSS: The QoS network........................................................................................ 7
5.2.9 High-throughput (HT) station (STA)........................................................................... 8
5.2.14 Mesh BSS: IEEE 802.11 wireless mesh network ........................................................ 8
5.2.14.1 General..................................................................................................... 8
5.2.14.2 Overview of the mesh BSS...................................................................... 8
5.2.14.3 Mesh STA ................................................................................................ 8
5.2.14.4 IEEE 802.11 components and mesh BSS ................................................ 9
5.2.14.5 Introduction to mesh functions .............................................................. 11
5.3 Logical service interfaces .......................................................................................................... 14
5.3.2 DSS ............................................................................................................................ 14
5.4 Overview of the services............................................................................................................ 15
5.4.1 Distribution of messages within a DS........................................................................ 15
5.4.1.1 Distribution ............................................................................................ 15
5.4.3 Access control and data confidentiality services ....................................................... 15
5.4.3.1 Authentication........................................................................................ 15
5.4.3.2 Deauthentication .................................................................................... 16
5.4.3.3 Data confidentiality................................................................................ 16
5.6a Differences between ESS and MBSS LANs ............................................................................. 16
5.8 IEEE Std 802.11 and IEEE Std 802.1X-2004 ........................................................................... 16
5.8.2 Infrastructure functional model overview.................................................................. 16
5.8.2.1a AKM Operations with a Password or PSK............................................ 17
5.8.2.2 Alternate Ooperations with PSK............................................................ 17
5.8.3 IBSS functional model description ............................................................................ 18
5.8.3.2 Sample IBSS 4-Way Handshake ........................................................... 18
6. MAC service definition ........................................................................................................................... 19
6.1 Overview of MAC services ....................................................................................................... 19
6.1.2 Security services ........................................................................................................ 19
6.1.5 MAC data service architecture .................................................................................. 19
7. Frame formats .......................................................................................................................................... 20
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7.1 MAC frame formats................................................................................................................... 20
7.1.1 Conventions ............................................................................................................... 20
7.1.2 General frame format................................................................................................. 20
7.1.3 Frame fields ............................................................................................................... 20
7.1.3.1 Frame Control field................................................................................ 20
7.1.3.5 QoS Control field................................................................................... 21
7.1.3.6 Frame Body field ................................................................................... 24
7.2 Format of individual frame types............................................................................................... 26
7.2.1 Control frames ........................................................................................................... 26
7.2.1.4 PS-Poll frame format ............................................................................. 26
7.2.2 Data frames ................................................................................................................ 27
7.2.2.1 Data frame format.................................................................................. 27
7.2.2.2 A-MSDU format .................................................................................... 28
7.2.3 Management frames................................................................................................... 28
7.2.3.1 Beacon frame format ............................................................................. 31
7.2.3.6 Reassociation Request frame format ..................................................... 32
7.2.3.8 Probe Request frame format .................................................................. 32
7.2.3.9 Probe Response frame format................................................................ 32
7.2.3.10 Authentication frame format.................................................................. 33
7.2.3.12 Action frame format............................................................................... 35
7.3 Management frame body components....................................................................................... 35
7.3.1 Fields that are not information elements.................................................................... 35
7.3.1.1 Authentication algorithm number field.................................................. 35
7.3.1.4 Capability Information field .................................................................. 35
7.3.1.7 Reason Code field.................................................................................. 36
7.3.1.8 AID field ................................................................................................ 37
7.3.1.9 Status Code field.................................................................................... 37
7.3.1.11 Action field ............................................................................................ 38
7.3.1.35 Send-Confirm field ................................................................................ 38
7.3.1.36 Anti-Clogging Token field..................................................................... 38
7.3.1.37 Scalar field ............................................................................................. 38
7.3.1.38 Element field.......................................................................................... 39
7.3.1.39 Confirm field.......................................................................................... 39
7.3.1.40 Finite Cyclic Group field ....................................................................... 39
7.3.2 Information elements ................................................................................................. 40
7.3.2.1 SSID element ......................................................................................... 41
7.3.2.2 Supported Rates element ....................................................................... 41
7.3.2.6 TIM element .......................................................................................... 41
7.3.2.9 Country element..................................................................................... 41
7.3.2.13 ERP Information element ...................................................................... 41
7.3.2.14 Extended Supported Rates element ....................................................... 42
7.3.2.16 Power Capability element...................................................................... 42
7.3.2.19 Supported Channels element ................................................................. 42
7.3.2.20 Channel Switch Announcement element............................................... 42
7.3.2.20a Secondary Channel Offset element........................................................ 43
7.3.2.25 RSN element .......................................................................................... 43
7.3.2.53 Extended Channel Switch Announcement element............................... 44
7.3.2.56 HT Capabilities element ........................................................................ 44
7.3.2.57 HT Operation element ........................................................................... 45
7.3.2.92 Interworking information element ......................................................... 46
7.3.2.98 Mesh Configuration element ................................................................. 47
7.3.2.99 Mesh ID element.................................................................................... 51
7.3.2.100 Mesh Link Metric Report element......................................................... 52
7.3.2.101 Congestion Notification element ........................................................... 52
IEEE P802.11s/D12.0, May 2011
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This is an unapproved IEEE Standards Draft, subject to change.
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7.3.2.102 Mesh Peering Management element...................................................... 53
7.3.2.103 Mesh Channel Switch Parameters element............................................ 54
7.3.2.104 Mesh Awake Window element.............................................................. 55
7.3.2.105 Beacon Timing element ......................................................................... 56
7.3.2.106 MCCAOP Setup Request element......................................................... 57
7.3.2.107 MCCAOP Setup Reply element ............................................................ 58
7.3.2.108 MCCAOP Advertisement Overview element........................................ 59
7.3.2.109 MCCAOP Advertisement element ........................................................ 60
7.3.2.110 MCCAOP Teardown element................................................................ 62
7.3.2.111 GANN element ...................................................................................... 63
7.3.2.112 RANN element ...................................................................................... 63
7.3.2.113 PREQ element........................................................................................ 64
7.3.2.114 PREP element ........................................................................................ 67
7.3.2.115 PERR element........................................................................................ 68
7.3.2.116 PXU element.......................................................................................... 69
7.3.2.117 PXUC element ....................................................................................... 71
7.3.2.118 Authenticated Mesh Peering Exchange element ................................... 71
7.3.2.119 MIC element .......................................................................................... 72
7.4 Action frame format details ....................................................................................................... 73
7.4.1 Spectrum management action details ........................................................................ 73
7.4.1.5 Channel Switch Announcement frame format....................................... 73
7.4.7 Public Action details.................................................................................................. 73
7.4.7.6 Extended Channel Switch Announcement frame format ...................... 73
7.4.14 Self-protected Action frame details ........................................................................... 74
7.4.14.1 Self-protected Action fields ................................................................... 74
7.4.14.2 Mesh Peering Open frame format.......................................................... 75
7.4.14.3 Mesh Peering Confirm frame format..................................................... 77
7.4.14.4 Mesh Peering Close frame format ......................................................... 78
7.4.14.5 Mesh Group Key Inform frame format.................................................. 79
7.4.14.6 Mesh Group Key Acknowledge frame format ...................................... 80
7.4.15 Mesh Action frame details......................................................................................... 81
7.4.15.1 Mesh Action fields................................................................................. 81
7.4.15.2 Mesh Link Metric Report frame format ................................................ 81
7.4.15.3 HWMP Mesh Path Selection frame format ........................................... 82
7.4.15.4 Gate Announcement frame format ........................................................ 83
7.4.15.5 Congestion Control Notification frame format...................................... 83
7.4.15.6 MCCA Setup Request frame format...................................................... 84
7.4.15.7 MCCA Setup Reply frame format ......................................................... 84
7.4.15.8 MCCA Advertisement Request frame format ....................................... 85
7.4.15.9 MCCA Advertisement frame format ..................................................... 85
7.4.15.10 MCCA Teardown frame format ............................................................ 86
7.4.15.11 TBTT Adjustment Request frame format.............................................. 86
7.4.15.12 TBTT Adjustment Response frame format ........................................... 87
7.4.16 Multihop Action frame details................................................................................... 87
7.4.16.1 Multihop Action fields........................................................................... 87
7.4.16.2 Proxy Update frame format ................................................................... 88
7.4.16.3 Proxy Update Confirmation frame format............................................. 88
8. Security .................................................................................................................................................... 90
8.1 Framework ................................................................................................................................. 90
8.1.1 Security methods........................................................................................................ 90
8.1.3 RSNA Establishment ................................................................................................. 90
8.1.6 Emergency service establishment in an RSN ............................................................ 91
IEEE P802.11s/D12.0, May 2011
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8.2 Pre-RSNA security methods...................................................................................................... 91
8.2a Authentication using a password ............................................................................................... 91
8.2a.1 SAE overview ............................................................................................................ 91
8.2a.2 Assumptions on SAE ................................................................................................. 92
8.2a.3 Representation of a password .................................................................................... 92
8.2a.4 Finite cyclic groups.................................................................................................... 93
8.2a.4.1 General................................................................................................... 93
8.2a.4.2 Elliptic curve cryptography (ECC) groups ............................................ 93
8.2a.4.3 Finite field cryptography (FFC) groups................................................. 95
8.2a.5 SAE protocol.............................................................................................................. 96
8.2a.5.1 Message exchanges................................................................................ 96
8.2a.5.2 PWE and secret generation .................................................................... 97
8.2a.5.3 Construction of a Commit Message....................................................... 97
8.2a.5.4 Processing of a peer’s Commit Message ............................................... 97
8.2a.5.5 Construction of a Confirm Message ...................................................... 98
8.2a.5.6 Processing of a peer’s Confirm Message............................................... 98
8.2a.6 Anti-clogging tokens.................................................................................................. 98
8.2a.7 Framing of SAE ......................................................................................................... 99
8.2a.7.1 General................................................................................................... 99
8.2a.7.2 Data type conversion ............................................................................. 99
8.2a.7.3 Authentication transaction sequence number for SAE ........................ 100
8.2a.7.4 Encoding and decoding of Commit Messages..................................... 100
8.2a.7.5 Encoding and decoding of Confirm Messages .................................... 101
8.2a.7.6 Status codes.......................................................................................... 101
8.2a.8 SAE finite state machine.......................................................................................... 101
8.2a.8.1 General................................................................................................. 101
8.2a.8.2 States.................................................................................................... 101
8.2a.8.3 Events and output................................................................................. 102
8.2a.8.4 Timers .................................................................................................. 103
8.2a.8.5 Variables .............................................................................................. 103
8.2a.8.6 Behavior of state machine.................................................................... 104
8.4 RSNA security association management................................................................................. 108
8.4.1 Security associations................................................................................................ 108
8.4.1.1 Security association definitions ........................................................... 108
8.4.1.2 Security association life cycle.............................................................. 111
8.4.6 RSNA authentication in an ESS .............................................................................. 112
8.4.6.2 Cached PMKSAs and RSNA key management .................................. 112
8.4.7 RSNA authentication in an IBSS............................................................................. 113
8.4.8 RSNA key management in an ESS.......................................................................... 113
8.5 Keys and key distribution ........................................................................................................ 113
8.5.1 Key hierarchy........................................................................................................... 113
8.5.1.5 FT key hierarchy.................................................................................. 113
8.5.3 4-Way Handshake.................................................................................................... 115
8.5.3.1 4-Way Handshake Message 1.............................................................. 115
8.5.6 RSNA Authenticator key management state machine............................................. 115
8.5.6.1 Authenticator state machine states....................................................... 115
8.8 Keys and key derivation algorithm for the authenticated mesh peering exchange (AMPE)... 115
8.8.1 Keys and key derivation algorithm.......................................................................... 115
9. MAC sublayer functional description.................................................................................................... 117
9.1 MAC architecture .................................................................................................................... 117
9.1.3 Hybrid coordination function (HCF) ....................................................................... 117
9.1.3.1 HCF contention-based channel access (EDCA) .................................. 118
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9.1.3a Mesh coordination function (MCF)......................................................................... 118
9.6 Multirate support...................................................................................................................... 118
9.6.0c1 Basic Rate Set and Basic MCS Set for mesh STA .................................................. 119
9.7d A-MPDU operation.................................................................................................................. 119
9.7d.4 A-MPDU aggregation of group addressed data frames........................................... 119
9.9 HCF.......................................................................................................................................... 119
9.9.1 HCF contention-based channel access (EDCA)...................................................... 119
9.9.1.2 EDCA TXOPs...................................................................................... 119
9.9a Mesh coordination function (MCF)......................................................................................... 120
9.9a.1 General..................................................................................................................... 120
9.9a.2 MCF contention-based channel access .................................................................... 120
9.9a.3 MCF controlled channel access (MCCA)................................................................ 120
9.9a.3.1 General................................................................................................. 120
9.9a.3.2 MCCA activation................................................................................. 121
9.9a.3.3 MCCAOP reservations ........................................................................ 121
9.9a.3.4 Neighborhood MCCAOP periods at a mesh STA ............................... 122
9.9a.3.5 MCCA access fraction (MAF)............................................................. 123
9.9a.3.6 MCCAOP setup procedure .................................................................. 123
9.9a.3.7 MCCAOP advertisement ..................................................................... 124
9.9a.3.8 MCCAOP teardown............................................................................. 129
9.9a.3.9 Access during MCCAOPs ................................................................... 130
9.9a.3.10 Interaction with time synchronization ................................................. 131
9.13 Protection mechanisms ............................................................................................................ 132
9.13.2 Protection mechanisms for non-ERP receivers ....................................................... 132
9.13.3 Protection mechanisms for transmissions of HT PPDUs ........................................ 132
9.13.3.1 General................................................................................................. 132
9.13.3.4a Protection rules for an HT mesh STA in an MBSS............................. 133
9.13.5 L-SIG TXOP protection........................................................................................... 134
9.13.5.1 General rules ........................................................................................ 134
9.22 Mesh forwarding framework ................................................................................................... 134
9.22.1 General..................................................................................................................... 134
9.22.2 Forwarding information........................................................................................... 134
9.22.3 Frame addressing in an MBSS................................................................................. 135
9.22.4 Addressing and forwarding of individually addressed Mesh Data frames.............. 137
9.22.4.1 At source mesh STAs (individually addressed)................................... 137
9.22.4.2 At intermediate and destination mesh STAs (individually addressed) 137
9.22.5 Addressing and forwarding of group addressed Mesh Data frames........................ 139
9.22.5.1 At source mesh STAs (group addressed)............................................. 139
9.22.5.2 At recipient mesh STAs (group addressed) ......................................... 139
9.22.6 Addressing of Management frames and MMPDU forwarding ............................... 140
9.22.6.1 General................................................................................................. 140
9.22.6.2 MMPDU forwarding using individually addressed Multihop Action
frames 140
9.22.6.3 MMPDU forwarding using group addressed Multihop Action frames 141
9.22.7 Detection of duplicate MSDUs/MMPDUs .............................................................. 142
9.22.8 Mesh STAs that do not forward............................................................................... 142
9.22.9 Frame forwarding and unknown destination ........................................................... 142
10. Layer management................................................................................................................................. 144
10.3 MLME SAP interface .............................................................................................................. 144
10.3.2 Scan.......................................................................................................................... 144
10.3.2.1 MLME-SCAN.request......................................................................... 144
10.3.2.2 MLME-SCAN.confirm........................................................................ 145
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10.3.3 Synchronization ....................................................................................................... 146
10.3.3.1 MLME-JOIN.request........................................................................... 146
10.3.4 Authenticate ............................................................................................................. 146
10.3.4.1 MLME-AUTHENTICATE.request..................................................... 146
10.3.4.2 MLME-AUTHENTICATE.confirm.................................................... 147
10.3.4.3 MLME-AUTHENTICATE.indication ................................................ 148
10.3.4.4 MLME-AUTHENTICATE.response .................................................. 149
10.3.5 Deauthenticate ......................................................................................................... 150
10.3.5.1 MLME-DEAUTHENTICATE.request................................................ 150
10.3.10 Start.......................................................................................................................... 150
10.3.10.1 MLME-START.request....................................................................... 151
10.3.10.2 MLME-START.confirm...................................................................... 153
10.3.15 Channel switch......................................................................................................... 153
10.3.15.1 MLME-CHANNELSWITCH.request ................................................. 153
10.3.15.3 MLME-CHANNELSWITCH.indication............................................. 154
10.3.15.4 MLME-CHANNELSWITCH.response............................................... 155
10.3.35 Extended channel switch announcement ................................................................. 156
10.3.35.1 MLME-EXTCHANNELSWITCH.request ......................................... 156
10.3.35.3 MLME-EXTCHANNELSWITCH.indication..................................... 157
10.3.35.4 MLME-EXTCHANNELSWITCH.response....................................... 158
10.3.77 Mesh peering management ...................................................................................... 159
10.3.77.1 Introduction.......................................................................................... 159
10.3.77.2 MLME-MESHPEERINGMANAGEMENT.request........................... 159
10.3.77.3 MLME-MESHPEERINGMANAGEMENT.confirm.......................... 160
10.3.77.4 MLME-MESHPEERINGMANAGEMENT.indication ...................... 161
10.3.77.5 MLME-MESHPEERINGMANAGEMENT.response ........................ 162
10.3.78 Mesh power management ........................................................................................ 162
10.3.78.1 Introduction.......................................................................................... 162
10.3.78.2 MLME-MESHPOWERMGT.request.................................................. 163
10.3.78.3 MLME-MESHPOWERMGT.confirm ................................................ 163
10.3.79 Mesh neighbor offset synchronization..................................................................... 164
10.3.79.1 Introduction.......................................................................................... 164
10.3.79.2 MLME-MESHNEIGHBOROFFSETSYNCSTART.request .............. 164
10.3.79.3 MLME-MESHNEIGHBOROFFSETSYNCSTART.confirm............. 165
10.3.79.4 MLME-MESHNEIGHBOROFFSETCALCULATE.request.............. 166
10.3.79.5 MLME-MESHNEIGHBOROFFSETCALCULATE.confirm ............ 166
10.3.79.6 MLME-MESHNEIGHBOROFFSETSYNCSTOP.request................. 167
10.3.79.7 MLME-MESHNEIGHBOROFFSETSYNCSTOP.confirm................ 168
10.3.80 Mesh TBTT adjustment ........................................................................................... 168
10.3.80.1 Introduction.......................................................................................... 168
10.3.80.2 MLME-MESHTBTTADJUSTMENT.request .................................... 169
10.3.80.3 MLME-MESHTBTTADJUSTMENT.confirm ................................... 169
10.3.80.4 MLME-MESHTBTTADJUSTMENT.indication................................ 170
10.3.80.5 MLME-MESHTBTTADJUSTMENT.response.................................. 171
10.3.81 MCCA management interface ................................................................................. 172
10.3.81.1 Introduction.......................................................................................... 172
10.3.81.2 MLME-ACTIVATEMCCA.request.................................................... 172
10.3.81.3 MLME-ACTIVATEMCCA.confirm................................................... 173
10.3.81.4 MLME-MCCASETUP.request............................................................ 174
10.3.81.5 MLME-MCCASETUP.confirm .......................................................... 175
10.3.81.6 MLME-MCCASETUP.indication ....................................................... 176
10.3.81.7 MLME-MCCASETUP.response ......................................................... 177
10.3.81.8 MLME-MCCAADVERTISEMENT.request ...................................... 178
10.3.81.9 MLME-MCCAADVERTISEMENT.confirm ..................................... 179
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This is an unapproved IEEE Standards Draft, subject to change.
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10.3.81.10 MLME-MCCAADVERTISEMENT.indication.................................. 180
10.3.81.11 MLME-MCCAADVERTISEMENT.response.................................... 181
10.3.81.12 MLME-MCCATEARDOWN.request................................................. 181
10.3.81.13 MLME-MCCATEARDOWN.confirm................................................ 182
10.3.81.14 MLME-MCCATEARDOWN.indication ............................................ 183
10.3.82 MBSS congestion control ........................................................................................ 184
10.3.82.1 Introduction.......................................................................................... 184
10.3.82.2 MLME-MBSSCONGESTIONCONTROL.request ............................ 184
10.3.82.3 MLME-MBSSCONGESTIONCONTROL.confirm ........................... 185
10.3.82.4 MLME-MBSSCONGESTIONCONTROL.indication ........................ 185
10.3.83 MBSS proxy update................................................................................................. 186
10.3.83.1 Introduction.......................................................................................... 186
10.3.83.2 MLME-MBSSPROXYUPDATE.request............................................ 186
10.3.83.3 MLME-MBSSPROXYUPDATE.confirm .......................................... 187
10.3.83.4 MLME-MBSSPROXYUPDATE.indication ....................................... 188
10.3.83.5 MLME-MBSSPROXYUPDATE.response ......................................... 189
10.3.84 MBSS mesh gate announcement ............................................................................. 190
10.3.84.1 Introduction.......................................................................................... 190
10.3.84.2 MLME-MBSSGATEANNOUNCEMENT.request ............................ 190
10.3.84.3 MLME-MBSSGATEANNOUNCEMENT.confirm ........................... 191
10.3.84.4 MLME-MBSSGATEANNOUNCEMENT.indication ........................ 191
10.3.85 Mesh link metric ...................................................................................................... 192
10.3.85.1 Introduction.......................................................................................... 192
10.3.85.2 MLME-MESHLINKMETRICREAD.request..................................... 192
10.3.85.3 MLME-MESHLINKMETRICREAD.confirm.................................... 193
10.3.85.4 MLME-MESHLINKMETRICREPORT.request ................................ 194
10.3.85.5 MLME-MESHLINKMETRICREPORT.confirm ............................... 195
10.3.85.6 MLME-MESHLINKMETRICREPORT.indication ............................ 196
10.3.86 HWMP mesh path selection .................................................................................... 197
10.3.86.1 Introduction.......................................................................................... 197
10.3.86.2 MLME-HWMPMESHPATHSELECTION.request............................ 197
10.3.86.3 MLME-HWMPMESHPATHSELECTION.confirm........................... 198
10.3.86.4 MLME-HWMPMESHPATHSELECTION.indication ....................... 199
11. MLME ................................................................................................................................................... 201
11.1 Synchronization ....................................................................................................................... 201
11.1.1 Basic approach......................................................................................................... 201
11.1.1.3 TSF for an MBSS ................................................................................ 201
11.1.2 Maintaining synchronization ................................................................................... 201
11.1.2.2a Beacon generation in an MBSS ........................................................... 201
11.1.2.3 Beacon reception.................................................................................. 201
11.1.3 Acquiring synchronization, scanning ...................................................................... 201
11.1.3.2 Active scanning.................................................................................... 202
11.2 Power management.................................................................................................................. 203
11.2.2a Power management in an MBSS ............................................................................. 203
11.3 STA authentication and association......................................................................................... 203
11.3.1 Authentication and deauthentication ....................................................................... 204
11.3.1.1 Authentication—originating STA........................................................ 204
11.3.1.2 Authentication—destination STA........................................................ 205
11.3.1.3 Deauthentication—originating STA .................................................... 205
11.3.1.4 Deauthentication—destination STA .................................................... 205
11.3.3 Additional mechanisms for an AP collocated with a mesh STA............................. 205
11.7 DLS operation.......................................................................................................................... 205
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11.8 TPC procedures........................................................................................................................ 206
11.8.1a Peering based on transmit power capability ............................................................ 206
11.8.2 Specification of regulatory and local maximum transmit power levels .................. 206
11.9 DFS procedures........................................................................................................................ 207
11.9.2 Quieting channels for testing ................................................................................... 207
11.9.6 Requesting and reporting of measurements............................................................. 207
11.9.7 Selecting and advertising a new channel ................................................................. 207
11.9.7.2a MBSS channel switching..................................................................... 208
11.9a Extended channel switching (ECS) ......................................................................................... 210
11.9a.1 General..................................................................................................................... 210
11.9a.3 Selecting and advertising a new channel and/or regulatory class............................ 210
11.9a.3.3 Selecting and advertising a new channel in an MBSS......................... 210
11.19 STAs communicating data frames outside the context of a BSS ............................................ 210
11.21 Tunneled direct-link setup ....................................................................................................... 211
11.21.1 General..................................................................................................................... 211
11.23 WLAN interworking with external networks procedures........................................................ 211
11.23.2 Interworking capabilities and information............................................................... 211
11.23.6 Interworking procedures: emergency services support ........................................... 211
11A.Fast BSS transition............................................................................................................................... 213
11A.2 Key holders .............................................................................................................................. 213
11A.2.2 Authenticator key holders........................................................................................ 213
11A.2.3 Supplicant key holders............................................................................................. 213
11A.4 FT initial mobility domain association .................................................................................... 213
11A.4.2 FT initial mobility domain association in an RSN .................................................. 213
11A.5 FT Protocol .............................................................................................................................. 214
11A.5.3 Over-the-DS FT Protocol authentication in an RSN ............................................... 214
11A.8 FT authentication sequence ..................................................................................................... 214
11A.8.4 FT authentication sequence: contents of third message........................................... 214
11A.8.5 FT authentication sequence: contents of fourth message ........................................ 214
11C.MLME mesh procedures...................................................................................................................... 215
11C.1 Mesh STA dependencies ......................................................................................................... 215
11C.2 Mesh discovery ........................................................................................................................ 215
11C.2.1 General..................................................................................................................... 215
11C.2.2 Mesh identifier......................................................................................................... 215
11C.2.3 Mesh profile............................................................................................................. 216
11C.2.4 Mesh STA configuration ......................................................................................... 216
11C.2.5 Supplemental information for the mesh discovery .................................................. 216
11C.2.6 Scanning mesh BSSs ............................................................................................... 217
11C.2.7 Candidate peer mesh STA ....................................................................................... 217
11C.2.8 Establishing or becoming a member of a mesh BSS ............................................... 217
11C.2.9 Establishing mesh peerings...................................................................................... 218
11C.3 Mesh peering management (MPM) ......................................................................................... 219
11C.3.1 General..................................................................................................................... 219
11C.3.2 State variable management ...................................................................................... 220
11C.3.3 Mesh authentication................................................................................................. 220
11C.3.4 Mesh peering instance controller............................................................................. 221
11C.3.4.1 Overview.............................................................................................. 221
11C.3.4.2 Creating a new mesh peering instance................................................. 222
11C.3.4.3 Deleting mesh peering instances.......................................................... 222
11C.3.5 Mesh peering instance selection .............................................................................. 222
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11C.3.6 Mesh peering open................................................................................................... 223
11C.3.6.1 Generating Mesh Peering Open frames ............................................... 223
11C.3.6.2 Mesh Peering Open frame processing ................................................. 223
11C.3.7 Mesh peering confirm.............................................................................................. 224
11C.3.7.1 Generating Mesh Peering Confirm frames .......................................... 224
11C.3.7.2 Mesh Peering Confirm frame processing ............................................ 224
11C.3.8 Mesh peering close .................................................................................................. 224
11C.3.8.1 Generating Mesh Peering Close frames............................................... 224
11C.3.8.2 Mesh Peering Close frame processing................................................. 225
11C.4 Mesh peering management finite state machine (MPM FSM)................................................ 225
11C.4.1 General..................................................................................................................... 225
11C.4.2 States........................................................................................................................ 225
11C.4.3 Events and actions ................................................................................................... 225
11C.4.4 Timers ...................................................................................................................... 227
11C.4.5 State transitions........................................................................................................ 227
11C.4.6 IDLE state ................................................................................................................ 229
11C.4.7 OPN_SNT state........................................................................................................ 230
11C.4.8 CNF_RCVD state .................................................................................................... 230
11C.4.9 OPN_RCVD state .................................................................................................... 231
11C.4.10 ESTAB state ............................................................................................................ 232
11C.4.11 HOLDING state....................................................................................................... 232
11C.5 Authenticated mesh peering exchange (AMPE)...................................................................... 232
11C.5.1 Overview.................................................................................................................. 232
11C.5.2 Security capabilities selection.................................................................................. 233
11C.5.2.1 Instance Pairwise Cipher Suite selection ............................................. 233
11C.5.2.2 Group cipher suite selection ................................................................ 233
11C.5.3 Construction and processing AES-SIV-protected Mesh Peering Management frames
234
11C.5.4 MGTK distribution .................................................................................................. 235
11C.5.5 Mesh Peering Management frames for AMPE........................................................ 235
11C.5.5.1 General................................................................................................. 235
11C.5.5.2 Mesh peering open for AMPE ............................................................. 235
11C.5.5.3 Mesh peering confirm for AMPE ........................................................ 236
11C.5.5.4 Mesh peering close for AMPE............................................................. 236
11C.5.6 AMPE finite state machine ...................................................................................... 237
11C.5.6.1 Overview.............................................................................................. 237
11C.5.6.2 Additional events and actions to MPM FSM....................................... 237
11C.5.6.3 State transitions.................................................................................... 238
11C.6 Mesh group key handshake...................................................................................................... 240
11C.6.1 General..................................................................................................................... 240
11C.6.2 Protection on mesh group key handshake frames.................................................... 241
11C.6.3 Mesh Group Key Inform frame construction and processing.................................. 242
11C.6.4 Mesh Group Key Acknowledge frame construction and processing ...................... 242
11C.6.5 Mesh group key implementation considerations ..................................................... 243
11C.7 Mesh path selection and metric framework............................................................................. 243
11C.7.1 General..................................................................................................................... 243
11C.7.2 Extensible path selection framework....................................................................... 244
11C.7.3 Link metric reporting ............................................................................................... 244
11C.8 Airtime link metric................................................................................................................... 244
11C.9 Hybrid wireless mesh protocol (HWMP) ................................................................................ 246
11C.9.1 General..................................................................................................................... 246
11C.9.2 Terminology............................................................................................................. 246
11C.9.3 On-demand path selection mode.............................................................................. 249
11C.9.4 Proactive tree building mode ................................................................................... 249
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11C.9.4.1 General................................................................................................. 249
11C.9.4.2 Proactive PREQ mechanism................................................................ 249
11C.9.4.3 Proactive RANN mechanism............................................................... 250
11C.9.5 Collocated STAs ...................................................................................................... 250
11C.9.6 Parameters for extensible path selection framework ............................................... 250
11C.9.7 Addressing of HWMP Mesh Path Selection frame ................................................. 251
11C.9.8 General rules for processing HWMP elements........................................................ 252
11C.9.8.1 General................................................................................................. 252
11C.9.8.2 HWMP propagation............................................................................. 252
11C.9.8.3 HWMP sequence numbering ............................................................... 253
11C.9.8.4 Forwarding information....................................................................... 254
11C.9.8.5 Repeated attempts at path discovery.................................................... 254
11C.9.8.6 Limiting the rate of HWMP sequence number increments ................. 254
11C.9.9 Path request (PREQ)................................................................................................ 255
11C.9.9.1 General................................................................................................. 255
11C.9.9.2 Function ............................................................................................... 255
11C.9.9.3 Conditions for generating and sending a PREQ .................................. 256
11C.9.9.4 PREQ processing ................................................................................. 264
11C.9.10 Path reply (PREP).................................................................................................... 265
11C.9.10.1 General................................................................................................. 265
11C.9.10.2 Function ............................................................................................... 265
11C.9.10.3 Conditions for generating and sending a PREP................................... 266
11C.9.10.4 PREP processing.................................................................................. 269
11C.9.11 Path error (PERR).................................................................................................... 270
11C.9.11.1 General................................................................................................. 270
11C.9.11.2 Function ............................................................................................... 270
11C.9.11.3 Conditions for generating and sending a PERR .................................. 270
11C.9.11.4 PERR processing ................................................................................. 273
11C.9.12 Root announcement (RANN) .................................................................................. 274
11C.9.12.1 General................................................................................................. 274
11C.9.12.2 Function ............................................................................................... 274
11C.9.12.3 Conditions for generating and sending a RANN ................................. 275
11C.9.12.4 RANN reception .................................................................................. 276
11C.9.13 Considerations for support of STAs without mesh functionality ............................ 277
11C.10 Interworking with the DS ........................................................................................................ 277
11C.10.1 Overview of interworking between a mesh BSS and a DS ..................................... 277
11C.10.2 Gate announcement protocol ................................................................................... 278
11C.10.2.1 General................................................................................................. 278
11C.10.2.2 Function ............................................................................................... 278
11C.10.2.3 Conditions for generating and sending a GANN................................. 278
11C.10.2.4 GANN processing................................................................................ 279
11C.10.3 Data forwarding at proxy mesh gates ...................................................................... 280
11C.10.3.1 General................................................................................................. 280
11C.10.3.2 Forwarding of MSDUs from the MBSS to the DS.............................. 280
11C.10.3.3 Forwarding of MSDUs from the DS to the MBSS.............................. 280
11C.10.4 Proxy information and proxy update ....................................................................... 282
11C.10.4.1 General................................................................................................. 282
11C.10.4.2 Proxy information ................................................................................ 282
11C.10.4.3 Proxy update (PXU)............................................................................. 283
11C.10.4.4 Proxy Update Confirmation (PXUC) .................................................. 285
11C.10.5 Mesh STA collocation ............................................................................................. 285
11C.11 Intra-mesh congestion control ................................................................................................. 286
11C.11.1 General..................................................................................................................... 286
11C.11.2 Congestion control signaling protocol..................................................................... 286
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11C.12 Synchronization and beaconing in MBSSs.............................................................................. 287
11C.12.1 TSF for MBSSs........................................................................................................ 287
11C.12.2 Extensible synchronization framework ................................................................... 287
11C.12.2.1 General................................................................................................. 287
11C.12.2.2 Neighbor offset synchronization method............................................. 288
11C.12.3 Beaconing ................................................................................................................ 290
11C.12.3.1 Beacon generation in MBSSs .............................................................. 290
11C.12.3.2 Beacon reception for mesh STA.......................................................... 290
11C.12.4 Mesh beacon collision avoidance (MBCA)............................................................. 290
11C.12.4.1 Overview.............................................................................................. 290
11C.12.4.2 Beacon timing advertisement............................................................... 291
11C.12.4.3 TBTT selection .................................................................................... 294
11C.12.4.4 TBTT adjustment................................................................................. 295
11C.12.4.5 Frame transmission across reported TBTT.......................................... 296
11C.12.4.6 Delayed beacon transmissions ............................................................. 296
11C.13 Power save in a mesh BSS....................................................................................................... 297
11C.13.1 General..................................................................................................................... 297
11C.13.2 Mesh power modes .................................................................................................. 297
11C.13.2.1 General................................................................................................. 297
11C.13.2.2 Peer-specific mesh power modes......................................................... 297
11C.13.2.3 Non-peer mesh power modes .............................................................. 298
11C.13.3 Mesh power mode indications and transitions......................................................... 299
11C.13.3.1 General................................................................................................. 299
11C.13.3.2 Transition to a higher activity level ..................................................... 299
11C.13.3.3 Transition to a lower activity level ...................................................... 300
11C.13.4 TIM transmissions in an MBSS............................................................................... 300
11C.13.5 TIM types................................................................................................................. 300
11C.13.6 Mesh awake window ............................................................................................... 300
11C.13.7 Power save support .................................................................................................. 301
11C.13.8 Operation in peer-specific and non-peer mesh power modes.................................. 301
11C.13.8.1 General................................................................................................. 301
11C.13.8.2 Operation in active mode..................................................................... 302
11C.13.8.3 Operation in deep sleep mode for non-peer mesh STAs ..................... 302
11C.13.8.4 Operation in light sleep mode for a mesh peering ............................... 303
11C.13.8.5 Operation in deep sleep mode for a mesh peering............................... 303
11C.13.8.6 Conditions for Doze state .................................................................... 303
11C.13.9 Mesh peer service periods........................................................................................ 303
11C.13.9.1 General................................................................................................. 303
11C.13.9.2 Initiation of a mesh peer service period............................................... 304
11C.13.9.3 Operation during a mesh peer service period ...................................... 305
11C.13.9.4 Termination of a mesh peer service period.......................................... 305
11C.13.10MCCA use by power saving mesh STA ................................................................. 305
Annex A ...................................................................................................................................................... 307
A.2 Abbreviations and special symbols.......................................................................................... 307
A.2.2 General abbreviations for Item and Supported columns ......................................... 307
A.4 PICS proforma—IEEE Std 802.11-2007................................................................................. 308
A.4.3 IUT configuration .................................................................................................... 308
A.4.4 MAC protocol .......................................................................................................... 308
A.4.4.1 MAC protocol capabilities................................................................... 308
A.4.4.4 MAC addressing functions .................................................................. 308
A.4.14 QoS base functionality............................................................................................. 309
A.4.15 QoS enhanced distributed channel access (EDCA)................................................. 310
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A.4.16 QoS hybrid coordination function (HCF) controlled channel access (HCCA) ....... 310
A.4.23 Mesh protocol capabilities ....................................................................................... 310
A.4.23.1 General mesh support .......................................................................... 311
A.4.23.2 HWMP path selection protocol capabilities ........................................ 316
Annex H ...................................................................................................................................................... 345
H.10 SAE test vector ........................................................................................................................ 345
Annex P ....................................................................................................................................................... 347
P.1 General..................................................................................................................................... 347
Annex S ....................................................................................................................................................... 348
S.2 Basic sequences ....................................................................................................................... 348
S.3 EDCA and HCCA sequences .................................................................................................. 348
Annex X ...................................................................................................................................................... 349
X.4 Interworking with external networks and emergency call support.......................................... 349
X.4.4 Access to emergency services in an RSN................................................................ 349
Annex Y ...................................................................................................................................................... 350
Y.1 Clarification of Mesh Data frame format ................................................................................ 350
Y.2 Operational considerations for interworking ........................................................................... 350
Y.2.1 Formation and maintenance of the IEEE 802.1D spanning tree.............................. 350
Y.3 Power save parameters selection ............................................................................................. 350
Y.3.1 General..................................................................................................................... 350
Y.3.2 Selecting the mesh power mode based on traffic load............................................. 351
Y.3.3 Scanning of mesh BSSs ........................................................................................... 351
Y.3.4 Default parameters................................................................................................... 351
Y.3.5 MSDU forwarding in an MBSS containing mesh STAs in light or deep sleep mode...
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Y.3.6 Synchronization maintenance of mesh STAs in deep sleep mode .......................... 352
Y.4 SIV key wrapping test vector................................................................................................... 352
Y.5 Airtime link metric usage example.......................................................................................... 354
Y.6 Generation of proactive PREPs in proactive PREQ mechanism of HWMP ........................... 354
Y.6.1 General..................................................................................................................... 354
Y.6.2 Additions to forwarding information....................................................................... 354
Y.6.3 Actions when sending data frames as source mesh STA......................................... 355
Y.6.4 Actions on receipt of proactive PREQ..................................................................... 355
Y.6.5 Generation of proactive PREPs ............................................................................... 355
Y.7 Generation of PREQs in proactive RANN mechanism of HWMP ......................................... 355
Y.7.1 General..................................................................................................................... 355
Y.7.2 Additions to forwarding information....................................................................... 356
Y.7.3 Actions when sending data frames as source mesh STA......................................... 356
Y.7.4 Actions on receipt of proactive RANN.................................................................... 356
Y.7.5 Actions on receipt of PREP ..................................................................................... 356
Y.8 Informative references ............................................................................................................. 357