Multi-AP_Specification_v2.0.pdf

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Used with the permission of Wi-Fi Alliance under the terms as stated in this document.

Multi-AP

Specification

Version 2.0

WI-FI ALLIANCE PROPRIETARY – SUBJECT TO CHANGE WITHOUT NOTICE

This document may be used with the permission of Wi-Fi Alliance under the terms set forth herein.

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as an approved specification, this document is a work in process and is not an approved Wi-Fi Alliance

specification. This document is subject to revision or removal at any time without notice. Information

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Multi-AP Specification v2.0 
 
© 2019 Wi-Fi Alliance. All Rights Reserved. 
Used with the permission of Wi-Fi Alliance under the terms as stated in this document. 
Page 3 of 113 
 
Table of contents 
OVERVIEW................................................................................................................................................................... 9 
1  Scope ............................................................................................................................................................ 9 
2  Purpose ......................................................................................................................................................... 9 
REFERENCES ........................................................................................................................................................... 10 
DEFINITIONS AND ACRONYMS .............................................................................................................................. 11 
1.1  Shall/should/may/might word usage .............................................................................................. 11 
1.2  Conventions ................................................................................................................................... 11 
1.3  Definitions ...................................................................................................................................... 11 
1.4  Abbreviations and acronyms .......................................................................................................... 13 
ARCHITECTURE ........................................................................................................................................................ 15 
1  Multi-AP architecture ................................................................................................................................... 15 
1.1  Multi-AP example deployment ....................................................................................................... 15 
MULTI-AP ONBOARDING ......................................................................................................................................... 19 
1  1905 Push Button Configuration method .................................................................................................... 19 
2  PBC Backhaul STA onboarding procedure................................................................................................. 19 
MULTI-AP DISCOVERY ............................................................................................................................................. 22 
1  Multi-AP controller discovery ...................................................................................................................... 22 
2  Multi-AP service discovery .......................................................................................................................... 23 
3  Client association and disassociation notification ....................................................................................... 23 
MULTI-AP CONFIGURATION .................................................................................................................................... 25 
1  AP configuration .......................................................................................................................................... 25 
2  AP operational BSS reporting ..................................................................................................................... 27 
3  Policy configuration ..................................................................................................................................... 27 
CHANNEL SELECTION ............................................................................................................................................. 29 
1  Channel Preference Query and Report ...................................................................................................... 29 
2  Channel Selection Request and Report ...................................................................................................... 29 
2.1  Coordinated DFS CAC ................................................................................................................... 31 
2.2  DFS CAC Scan Requirements on a Multi-AP Controller ............................................................... 31 
2.3  DFS CAC Scan Requirements on a Multi-AP Agent ..................................................................... 31 
CAPABILITY INFORMATION REPORTING .............................................................................................................. 33 
1  AP capability ............................................................................................................................................... 33 
2  Client capability ........................................................................................................................................... 33 
3  Backhaul STA capability ............................................................................................................................. 34 
LINK METRIC COLLECTION ..................................................................................................................................... 35 
1  Backhaul link metrics .................................................................................................................................. 35 
2  Per-AP metrics and bulk STA metrics ......................................................................................................... 35 
2.1  Link metric measurements from the AP ........................................................................................ 35 
2.2  Channel Scan ................................................................................................................................ 36 
3  Per-STA measurements .............................................................................................................................. 38 
3.1  Associated STA link measurements from the AP ......................................................................... 38 
3.2  Unassociated STA RCPI measurements from the AP .................................................................. 39 
3.3  802.11 beacon measurements from the client .............................................................................. 40 
4  Combined infrastructure metrics ................................................................................................................. 40 
CLIENT STEERING .................................................................................................................................................... 42 
1  Multi-AP Controller initiated steering mandate ........................................................................................... 42 
2  Multi-AP Controller initiated steering opportunity ........................................................................................ 42 
3  Multi-AP Agent initiated RCPI-based steering ............................................................................................ 43 
3.1  RCPI-based steering rules ............................................................................................................ 43 
4  Multi-AP Agent determination of target BSS ............................................................................................... 43 

Multi-AP Specification v2.0 
 
© 2019 Wi-Fi Alliance. All Rights Reserved. 
Used with the permission of Wi-Fi Alliance under the terms as stated in this document. 
Page 4 of 113 
5  Steering mechanisms .................................................................................................................................. 43 
6  Client association control mechanism ......................................................................................................... 44 
7  Wi-Fi Agile Multiband and Tunneled Message support .............................................................................. 45 
BACKHAUL OPTIMIZATION ...................................................................................................................................... 47 
1  Backhaul optimization by backhaul station association control .................................................................. 47 
MULTI-AP MESSAGING SECURITY ......................................................................................................................... 49 
FOUR-ADDRESS MAC HEADER FORMAT .............................................................................................................. 50 
1  Wi-Fi backhaul frame and address handling............................................................................................... 50 
1.1  Receiver requirements .................................................................................................................. 50 
1.2  Transmitter requirements .............................................................................................................. 50 
1.3  Wired backhaul frame and address handling ............................................................................... 51 
MULTI-AP CONTROL MESSAGING RELIABILITY ................................................................................................... 52 
1  CMDU reliable multicast transmission ........................................................................................................ 52 
1.1  CMDU reliable multicast transmission procedures ....................................................................... 52 
1.2  CMDU reliable multicast reception procedures ............................................................................ 52 
HIGHER LAYER DATA PAYLOAD OVER 1905 ........................................................................................................ 53 
MULTI-AP CONTROL MESSAGING ......................................................................................................................... 54 
1  Multi-AP message format ............................................................................................................................ 54 
1.1  1905 AP-Autoconfiguration Search message format (extended) ................................................. 61 
1.2  1905 AP-Autoconfiguration Response message format (extended) ............................................ 61 
1.3  1905 AP-Autoconfiguration WSC message format (extended) .................................................... 61 
1.4  1905 Topology Response message format (extended) ................................................................ 61 
1.5  1905 Topology Notification message format (extended) .............................................................. 62 
1.6  AP Capability Query message format ........................................................................................... 62 
1.7  AP Capability Report message format .......................................................................................... 62 
1.8  Multi-AP Policy Config Request message format ......................................................................... 62 
1.9  Channel Preference Query message format ................................................................................ 62 
1.10  Channel Preference Report message format ............................................................................. 62 
1.11  Channel Selection Request message format ............................................................................. 62 
1.12  Channel Selection Response message format ........................................................................... 63 
1.13  Operating Channel Report message format ............................................................................... 63 
1.14  Client Capability Query message format .................................................................................... 63 
1.15  Client Capability Report message format ................................................................................... 63 
1.16  AP Metrics Query Message format ............................................................................................. 63 
1.17  AP Metrics Response Message format....................................................................................... 63 
1.18  Associated STA Link Metrics Query message format ................................................................ 63 
1.19  Associated STA Link Metrics Response message format .......................................................... 63 
1.20  Unassociated STA Link Metrics Query message format ............................................................ 64 
1.21  Unassociated STA Link Metrics Response message format ...................................................... 64 
1.22  Beacon Metrics Query message format ..................................................................................... 64 
1.23  Beacon Metrics Response message format ............................................................................... 64 
1.24  Combined Infrastructure Metrics message format ...................................................................... 64 
1.25  Client Steering Request message format ................................................................................... 64 
1.26  Client Steering BTM Report message format ............................................................................. 64 
1.27  Client Association Control Request message format ................................................................. 65 
1.28  Steering Completed message format ......................................................................................... 65 
1.29  Backhaul Steering Request message format ............................................................................. 65 
1.30  Backhaul Steering Response message format ........................................................................... 65 
1.31  Higher Layer Data message format ............................................................................................ 65 
1.32  1905 Ack message format .......................................................................................................... 65 
1.33  Channel Scan Request message format .................................................................................... 65 
1.34  Channel Scan Report message format ....................................................................................... 65 
1.35  CAC Request message format ................................................................................................... 65 
1.36  CAC Termination message format .............................................................................................. 65 
1.37  Error Response message format ................................................................................................ 66 

Multi-AP Specification v2.0 
 
© 2019 Wi-Fi Alliance. All Rights Reserved. 
Used with the permission of Wi-Fi Alliance under the terms as stated in this document. 
Page 5 of 113 
1.38  Topology Query message format ................................................................................................ 66 
1.39  Association Status Notification message format ......................................................................... 66 
1.40  Tunneled message format .......................................................................................................... 66 
1.41  Client Disassociation Stats message format .............................................................................. 66 
1.42  Backhaul STA Capability Query message format ....................................................................... 66 
1.43  Backhaul STA Capability Report message format ...................................................................... 66 
1.44  Failed Connection message ....................................................................................................... 66 
2  Multi-AP TLVs format .................................................................................................................................. 67 
2.1  SupportedService TLV format ....................................................................................................... 67 
2.2  SearchedService TLV format ........................................................................................................ 67 
2.3  AP Radio Identifier TLV format ..................................................................................................... 67 
2.4  AP Operational BSS TLV format ................................................................................................... 67 
2.5  Associated Clients TLV format ...................................................................................................... 68 
2.6  AP Capability TLV format .............................................................................................................. 68 
2.7  AP Radio Basic Capabilities TLV format ...................................................................................... 69 
2.8  AP HT Capabilities TLV format ..................................................................................................... 69 
2.9  AP VHT Capabilities TLV format ................................................................................................... 70 
2.10  AP HE Capabilities TLV format ................................................................................................... 71 
2.11  Steering Policy TLV format ......................................................................................................... 72 
2.12  Metric Reporting Policy TLV format ............................................................................................ 73 
2.13  Channel Preference TLV format ................................................................................................. 74 
2.14  Radio Operation Restriction TLV format ..................................................................................... 75 
2.15  Transmit Power Limit TLV format ............................................................................................... 76 
2.16  Channel Selection Response TLV format ................................................................................... 76 
2.17  Operating Channel Report TLV format ....................................................................................... 77 
2.18  Client Info TLV format ................................................................................................................. 77 
2.19  Client Capability Report TLV format ........................................................................................... 77 
2.20  Client Association Event TLV format .......................................................................................... 78 
2.21  AP Metric Query TLV format ....................................................................................................... 78 
2.22  AP Metrics TLV format ................................................................................................................ 78 
2.23  STA MAC Address Type TLV format .......................................................................................... 79 
2.24  Associated STA Link Metrics TLV format ................................................................................... 79 
2.25  Unassociated STA Link Metrics Query TLV format .................................................................... 80 
2.26  Unassociated STA Link Metrics Response TLV format .............................................................. 80 
2.27  Beacon Metrics Query TLV format .............................................................................................. 81 
2.28  Beacon Metrics Response TLV format ....................................................................................... 82 
2.29  Steering Request TLV format ..................................................................................................... 82 
2.30  Steering BTM Report TLV format ............................................................................................... 83 
2.31  Client Association Control Request TLV format ......................................................................... 84 
2.32  Backhaul Steering Request TLV format ..................................................................................... 84 
2.33  Backhaul Steering Response TLV format ................................................................................... 85 
2.34  Higher Layer Data TLV format .................................................................................................... 85 
2.35  Associated STA Traffic Stats TLV format ................................................................................... 85 
2.36  Error Code TLV format ................................................................................................................ 86 
2.37  Channel Scan Reporting Policy TLV format ............................................................................... 87 
2.38  Channel Scan Capabilities TLV format ....................................................................................... 87 
2.39  Channel Scan Request TLV format ............................................................................................ 88 
2.40  Channel Scan Result TLV format ............................................................................................... 89 
2.41  Timestamp TLV format ............................................................................................................... 91 
2.42  CAC Request TLV format ........................................................................................................... 91 
2.43  CAC Termination TLV format ...................................................................................................... 92 
2.44  CAC Completion Report TLV format........................................................................................... 93 
2.45  CAC Status Report TLV format ................................................................................................... 93 
2.46  CAC Capabilities TLV format ...................................................................................................... 94 
2.47  Multi-AP Profile TLV format ........................................................................................................ 95 
2.48  Profile-2 AP Capability TLV format ............................................................................................. 96 
2.49  Default 802.1Q Settings TLV format ........................................................................................... 96 
2.50  Traffic Separation Policy TLV format .......................................................................................... 96 