Proposed MAP Channel Access Procedures in IEEE 802.11-24/72r0

In the May 2024 document IEEE 802.11-24/72r0, a uniform MAP coordination framework is discussed, involving procedures like M-AP discovery, coordinated transmissions, and channel access mechanisms. All APs in a coordination group can compete for channel access and share transmission opportunities. The document suggests a MAP QoS Characteristic sharing process among APs and emphasizes the use of trigger frames for efficient communication. Different channel access schemes, such as C-TDMA and C-SR, are illustrated with examples for better understanding of the proposed procedures.

• MAP Coordination
• Channel Access
• IEEE 802.11
• Transmission Opportunities
• Trigger Frames

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1. May. 2024 Doc.: IEEE 802.11-24/72r0 MAP channel access procedure Name Jay Yang Affiliations Address Phone email Yang.zhijie@zte.com.cn ZTE Qisheng Huang ZTE Bo Cao ZTE YanLi ZTE YaodongZhang ZTE Zisheng Wang ZTE Submission Jay Yang, et al. (ZTE)

2. May. 2024 Doc.: IEEE 802.11-24/72r0 Introduction Several contributions discussed the uniform MAP coordination framework. E.g. a general MAP coordination procedure in [2]: M-AP Discovery Coordinated TX agreement Pre TX M-AP Coordinated transmission Also, several contributions[3]--[7] agree that one AP(Sharing AP) shares its partial TXOP to another AP(Shared AP) via a Trigger frame under c-TDMA scheme. On another aspect, each AP follows the conventional EDCA rule to compete the channel independently in OBSS environment. New MAP TXOP sharing mechanism can be take into account as an supplement approach. In this contribution, we will further discuss the MAP channel access procedure. Submission Slide 2 Jay Yang, et al. (ZTE)

3. May. 2024 Doc.: IEEE 802.11-24/72r0 MAP coordination channel access procedure The main ideas 1. All APs have the equal status, and all the APs in a MAP coordination group can compete the channel at any time and share its TXOP via a trigger frame. The general MAP channel access steps (after MAP agreement) 1. Every AP shares the MAP QoS Characteristic(MQC) to other AP(s) via a TBD signaling(long- term). Note: it will be more efficient for the signaling transmitted in groupcast manner if at least three APs in the MAP coordination group. 2. Multiple APs may or may not compete the channel at the same time. Note: Following current EDCA rule to compete the channel independently. 3. Only one AP compete the channel successfully, and becomes to the sharing AP if it shares its TXOP to other APs via a Trigger frame. Submission Slide 3 Jay Yang, et al. (ZTE)

4. May. 2024 The following figure depicts an example of MAP channel access procedure under proposed C-TDMA scheme Doc.: IEEE 802.11-24/72r0 TXOP1 TXOP2 Long term TXOP shares to AP2 In-BSS Sharing AP In-BSS T F AP1 MQC 3 2 1 0 5 4 3 t TXOP shares to AP1 Sharing AP In-BSS T F In-BSS t MQC 2 1 0 AP2 6 5 4 3 T6 T3 T4 T1 T5 T2 Submission Slide 4 Jay Yang, et al. (ZTE)

5. May. 2024 The following figure depicts an example of MAP channel access procedure under proposed C-SR scheme Doc.: IEEE 802.11-24/72r0 Long term TXOP1 TXOP2 Sharing AP TF AP1 MQC 3 2 1 0 5 4 3 Shared AP t Shared AP Sharing AP t TF MQC 2 1 0 AP2 6 5 4 3 t Shared AP MQC 3 2 1 Shared AP AP3 4 OBSS T1 T2 T6 T5 T4 Submission Slide 5 Jay Yang, et al. (ZTE)

6. May. 2024 Doc.: IEEE 802.11-24/72r0 Fairness issue and possible solution MAP TXOP sharing approach makes 11bn AP has more opportunity to access the media than pre-11bn AP,which may cause fairness concern. A 11bn shared AP can access the media based on both MAP TXOP sharing and conventional EDCA mechanism. Two Opts to mitigate such concern. Opt1 : Including (MAP) MU-EDCA in the Beacon or other MGMT. frame, and the shared AP follow (MAP)MU-EDCA parameter to compete the channel after TXOP sharing procedure. Opt2: Shared APs select a new backoff window after MAP TXOP sharing procedure. Submission Slide 6 Jay Yang, et al. (ZTE)

7. May. 2024 Doc.: IEEE 802.11-24/72r0 Summary Propose a MAP coordination channel access procedure Analyze the fairness issue and propose two options to address it Submission Slide 7 Jay Yang, et al. (ZTE)

8. May. 2024 Doc.: IEEE 802.11-24/72r0 THANK YOU Submission

9. May. 2024 Doc.: IEEE 802.11-24/72r0 Reference [1]802.11bn PAR [2]23/1871r2 M-AP Coordinated Transmission framework [3]24/0093 C-TDMA NAV setting [4]24/0227 TXOP Protection in C-TDMA [5]24/0375 NAV protection for C-TDMA [6]24/0382 Further Considerations on Coordinated TDMA [7]24/0411 TXOP Return in C-TDMA [8]23/1868 Coordinated-Spatial-Reuse-Design Submission Slide 9 Jay Yang, et al. (ZTE)

10. May. 2024 Doc.: IEEE 802.11-24/72r0 SP1 Do you agree 11bn SFD should have the definition of sharing AP and shared AP in MAP coordination scheme. sharing AP: A UHR AP that is a TXOP holder and intends to share its TXOP to the other AP(s) via a TBD frame. shared AP: An UHR AP that is a TXOP responder and granted a portion of TXOP by the sharing AP via a TBD frame. Submission Slide 10 Jay Yang, et al. (ZTE)