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本文档《Multi-AP Specification Version 2.0》是Wi-Fi联盟发布的关于多接入点(Multi-AP)规范的专有文件，属于“工作中的文档”，并非经过正式批准的Wi-Fi联盟规范。这份文件正在不断更新和完善中，可能会随时进行修订或删除，因此使用其中的信息存在一定的风险。文档中的内容仅限于获得Wi-Fi联盟许可的情况下使用，并不代表Wi-Fi联盟对其内容或准确性有任何的认可或保证。未经Wi-Fi联盟书面许可，严禁任何其他使用、复制或分发该文档的行为，否则将构成对Wi-Fi联盟版权的侵犯。文档中提到了EasyMesh技术，这是一种旨在简化多接入点组网的技术规范，其目的是为了提供更加统一和标准化的方式来实现Wi-Fi覆盖和性能优化。EasyMesh技术在设计时考虑了设备间的兼容性与互操作性，使得不同厂商的无线设备可以在同一网络内协同工作。不过，需要注意的是，文档中也明确指出，Wi-Fi联盟并没有对本文件和其中涉及的知识产权（包括但不限于专利、版权和商业秘密等）进行独立审查，不提供关于知识产权的任何保证或声明。如果需要制造、使用或销售文档中提及的发明创造，用户必须事先从第三方获得相应的授权许可。 Wi-Fi联盟保留在本文件上的所有版权，并保留所有相关权利。用户在授权用途下可以复制和分发本文件的副本，但复制的全部或部分必须包含文档的版权声明和免责声明。Wi-Fi联盟还声明，任何未经授权的使用、复制或分发文档的行为都是对其版权的侵犯，并且Wi-Fi联盟不对本文件或其中包含的信息使用中产生的任何直接、间接、惩罚性、特别、附带性、后果性或示范性损害承担任何责任。本文档自2019年以来受版权保护，且使用时需获得Wi-Fi联盟的许可。这份文档提供了关于Wi-Fi联盟Multi-AP规范的技术细节，并强调了EasyMesh作为一种用于多接入点的组网规范。该技术规范正在开发中，内容可能发生变更，使用前需获得许可，并且用户需自行承担使用风险。同时，文档中对知识产权的处理特别指出，用户在使用相关技术时可能需要获取第三方的专利授权。此外，该文档表明了Wi-Fi联盟对于文档内容的声明、权利保留以及免责声明。

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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.

By your use of the document, you are agreeing to these terms. Unless this document is clearly designated

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

contained in this document may be used at your sole risk. Wi-Fi Alliance assumes no responsibility for

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without limitation patents, copyrights or trade secret rights. This document may contain inventions for which

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INFORMATION CONTAINED IN THIS DOCUMENT.

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 