Multi-AP Coordination and Roaming for IEEE 802.11
This document presents insights into defining multi-AP operations in the IEEE 802.11bn context. It covers various coordination operations and seamless roaming strategies, highlighting the significance of collaborative methods such as Coordinated TDMA, rTWT/TWT, and OFDMA. The paper emphasizes the diverse requirements and implications of multi-AP operations for efficient network performance and user experience.
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April 2024 doc.: IEEE 802.11-24/453r0 Multi-AP Coordination and Roaming Date: 2024-04-15 Authors: Name Xiaofei Wang Affiliations Address InterDigital Communication Inc. Phone +1 631.622.4028 email Xiaofei.wang@interdigital .com Joseph Levy 111 West 33rd Street Suite 1420 New York, NY, USA Hanqing Lou Mahmoud Kamel Ying Wang Rui Yang Submission Slide 1 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Abstract In this contribution we share some thoughts on the approaches for defining multi-AP operations in 11bn, including various coordination operations as well as seamless roaming. Submission Slide 2 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Introduction Multi-AP has been proposed as a UHR feature, including many variants of coordinated operations Numerous contributions have been presented for each of the topics in EHT, 11be, UHR and in 11bn In this contribution, we share our thoughts on the approaches of defining multi-AP operations We also discuss potential impacts of the approaches of defining multi-AP operations on defining seamless roaming procedures Submission Slide 3 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Proposed Multi-AP Operations There have been many contributions presented on the multi-AP topic in EHT, 11be, UHR and 11bn including the following: Coordinated TDMA Coordinated rTWT/TWT Coordinated OFDMA Coordinated spatial reuse Coordinated Beamforming Joint transmission Clearly there has been a lot of interests Majority of the contributions on multi-AP operations have been on one of these multi-AP operations Submission Slide 4 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Analysis of Multi-AP Operations (1) These proposed multi-AP operations are very different They require different knowledge of the network topology They require different knowledge of the channel state information C-TDMA requires APs to be within range, while C-BF requires much more details They require sharing of different information for the correspodning coordination Tx/Rx timing/scheduling, Tx power, Tx/Rx RU allocation They have different timing requirements C-OFDMA, C-BF and JT require synchronization They have different data sharing requirements JT requires data sharing among the transmitting APs Submission Slide 5 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Analysis of Multi-AP Operations (2) These proposed multi-AP operations also have a lot in common They require to identify a set of APs prior to the multi-AP operations E.g., a set of two APs may be sufficient for C-TDMA, but that set of APs is likely larger for other multi-AP operations such as C-rTWT, C-SR They require sharing of coordination information E.g., Tx/Rx timing/scheduling, Tx power, Tx/Rx RU allocation They require decisions in coordination (Arbitrations) E.g., if multiple APs want to use an overlapping time, who gets it? Submission Slide 6 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Approaches to Define Multi-AP Operations (1) Based on the analysis, there may be two approaches defining multi-AP operations in 11bn Approach 1: study and define each multi-AP operation proposed Pro: Organic growth of each feature May leverage existing features Con: Cannot leverage commonality among different multi-AP operations May define overlapping signaling used for the same purpose for different operations May only be limited to one or two multi-AP operations Lack of possibility of easy expansion for future similar features Submission Slide 7 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Approaches to Define Multi-AP Operations (2) Approach 2: study multi-AP operations as a whole and define a common framework Pro: Easily leverage commonality among different multi-AP operations May support a higher number of multi-AP operations Possibility of easy expansion for future similar features Con: May consume longer time to consider multiple multi-AP operations before defining a common framework In addition, if a common framework for multi-AP operations is defined, likely an arbitration/coordination entity needs to be defined to facilitate decisions in case of more than 2 participating APs E.g., a coordination/information sharing virtual entity Submission Slide 8 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Multi-AP Operations and Seamless roaming Seamless roaming support has also been proposed for UHR [1][2][3][4] Seamless roaming also involves APs that are not co-located Seamless roaming also requires coordinating among multiple APs and information sharing among APs Seamless roaming can be easily viewed as a coordinated multi-AP operation If a common framework and/or coordinating/information sharing entity can be defined for multi-AP operations, the same framework and coordinating/information sharing entity can be leveraged to support seamless roaming Submission Slide 9 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 Conclusions Two approaches for defining multi-AP operations in 11bn has been discussed Approach 1: piece-wise study and define each multi-AP operation proposed Approach 2: study multi-AP operations as a whole and define a common framework and maybe a coordinating/information sharing entity for the case there are more than 2 participating APs We looked at the pros and cons for both Approaches Approach 2 likely will provide a better design and provide better expansion support for similar features in the future, even though it may consume a bit more time Defining a common framework and a coordinating/information sharing entity for multi-AP operations may benefit seamless roaming design as well Submission Slide 10 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 References [1] 11-22/1910r3, Seamless Roaming for UHR, Duncan Ho [2] 11-23/237, Considerations on Seamless Roaming, Insun Jang [3] 11-23/0170, Smooth Roaming, Liwen Chu [4] 11-23/231, Thoughts on Seamless Roaming Under Non-collocated AP MLD Architecture, Guoguang Huang [5] 11-23/295r1, Discussion on Multi-AP Coordination, Xiaofei Wang Submission Slide 11 Xiaofei Wang (InterDigital)
April 2024 doc.: IEEE 802.11-24/453r0 SP #1 Which approach for 11bn to define multi-AP operations do you prefer? Approach 1: piece-wise approach for each individual multi-AP operations Approach 2: define a unified framework for multi-AP operations Abs: Submission Slide 12 Abhishek Patil, Qualcomm Inc.
April 2024 doc.: IEEE 802.11-24/453r0 SP #2 Do you agree that a coordinating entity should be defined to enable multi-AP operation coordination? Submission Slide 13 Abhishek Patil, Qualcomm Inc.
