IEEE 802.11-24/0941r0 TXOP Sharing Group Overview
Explore the concept of TXOP sharing within IEEE 802.11-24/0941r0, focusing on the need for a TXOP Sharing Group to address low-latency traffic arrival scenarios. The document discusses Multi-AP Coordination, TXOP Sharing Group operation, and the extension of Triggered TXOP Sharing frameworks.
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May 2024 doc.: IEEE 802.11-24/0941r0 TXOP Sharing Group Shared AP Selection Date: 2024-05-16 Authors: Name Klaus Doppler Affiliations Nokia Address 520 Almanor Ave, Sunnyvale CA 94085 Phone email Klaus.doppler@nokia.com Okan.mutgan@nokia.com Okan Mutgan Nokia Prabodh.varshney@nokia.co m Mika.kasslin@nokia.com Prabodh Varshney Nokia Mika Kasslin Nokia lorenzo.galati_giordano@noki a-bell-labs.com Lorenzo Galati Giordano Francisco Wilhelmi Nokia Francisco.Wilhelmi@nokia- bell-labs.com Gianluca.Fontanesi@nokia- bell-labs.com Nokia Gianluca Fontanesi Nokia Submission Slide 1 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 Introduction There have been multiple contributions on TXOP sharing and coordinated TDMA (C- TDMA) e.g. [1]-[11]. A Multi-AP Coordination (MAPC) set has been proposed in [6]; MAPC can be used to coordinate PS, channel use, TWT, NPRCA TXOP Sharing is hyper-local for BSS on the same channel TXOP can be rather long (5ms) and low latency traffic may arrive at a potential Shared AP which is unknown to the Sharing AP In this contribution we discuss the need for a TXOP Sharing Group that takes newly arrived low latency traffic into account Submission Slide 2 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 TXOP Sharing Group TXOP Sharing Group OBSS operating on the same primary channel Can be a subset of MAPC group Defines a mechanism to share TXOP between OBSS participating in the TXOP Sharing Group AP1 AP3 AP2 STA1 STA3 STA2 Submission Slide 3 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 Recap) Multi-AP C-TDMA MAC procedure [12] C-TDMA time allocation Discussion on extending the 11be Triggered TXOP Sharing (TXS) framework to Coordinated Time Division Multiple Access (C-TDMA) in 11bn An MU-RTS TXS Trigger frame can be used for a sharing AP to allocate a time duration to a selected single shared AP. Potential signaling sequence A sharing AP transmits an MU-RTS TXS Trigger frame to a shared AP for C-TDMA time allocation. The shared AP responds with a CTS frame in response to the MU-RTS TXS Trigger frame. The shared AP can do frame exchange with its associated non-AP STAs during the allocation time indicated in the MU- RTS TXS Trigger frame. Often the Sharing AP does not know which of the Shared AP in the vicinity needs the TXOP and has e.g. low latency traffic to transmit MU-RTS TXS Sharing AP (BSS1) C T S B A Data TF Shared AP (BSS2) B A TB PPDU STAs (BSS2) AP3 AP1 STA3 AP2 STA1 AP4STA4 STA2 Submission Slide 4 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 TXOP Sharing with Probe C-TDMA allocation Form a TXOP Sharing Group Offer TXOP Sharing to group or individual members of TXOP Sharing group Receive TXOP request from these TXOP group members Grant remainder or fraction of the remaining TXOP to Shared AP Possibility to reuse existing frames or to define new frames for that exchange TXOP Sharing offer TXOP grant Sharing AP (BSS1) TXOP request Data Shared AP (BSS2) BA STA (BSS2) TXOP request Shared AP (BSS3) Submission Slide 5 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 TXOP Sharing with Probe MU-RTS C-TDMA allocation Sharing AP sends adaptation of MU- RTS TXS frame to probe TXOP Sharing Group members MU-CTS is used by Sharing Group members to indicate request to get the TXOP Sharing AP sends an (adapted) MU-RTS TXS message to indicate which Shared AP(s) get (part of) the TXOP Could include TDMA allocation to multiple Shared APs MU-RTS TXS MU-RTS TXS Sharing AP (BSS1) MU-CTS Data Shared AP (BSS2) BA STA (BSS2) Data MU-CTS Shared AP (BSS3) BA STA (BSS3) Submission Slide 6 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 TXOP Sharing with non-primary channel operation C-TDMA allocation Shared AP can operate on a non-primary channel Sharing AP sends adaptation of MU- RTS TXS frame to probe TXOP Sharing Group members MU-CTS is used by Sharing Group members to indicate request to get the TXOP Sharing AP sends an (adapted) MU-RTS TXS message to indicate which Shared AP(s) get (part of) the TXOP and share of bandwidth Here the assumption is all BSS use 80MHz and the Sharing AP allocates lower 40MHz to BSS2 and upper 40MHz to BSS3 MU-RTS TXS MU-RTS TXS Sharing AP (BSS1) MU-CTS Data on lower 40MHz Shared AP (BSS2) BA on lower 40MHz STA (BSS2) Data on upper 40MHz MU-CTS Shared AP (BSS3) BA on upper 40MHz STA (BSS3) Submission Slide 7 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 Summary Multiple AP form a TXOP Sharing Group Sharing AP can probe members of TXOP Sharing Group, e.g. to find out which TXOP Sharing Group member has low latency traffic and needs the TXOP Sharing AP can grant (part of) TXOP to Shared AP based on the received responses from TXOP Sharing Group members Submission Slide 8 Klaus Doppler, et.al., Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 Strawpoll Do you agree that a TXOP Sharing Group which may be a subset of a MAPC group should be established to coordinate the sharing of TXOPs? YES No Abstain Submission Slide 9 Klaus Doppler, et.al, Nokia
May 2024 doc.: IEEE 802.11-24/0941r0 References [1] 23/0041r0, Considerations on Coordinated TDMA (C-TDMA) [2] 23/0249r1, Extended TXOP Sharing [3] 23/0261r0, C-TDMA procedure in UHR [4] 23/0739r1, Follow-up on Coordinated TDMA (C-TDMA) [5] 23/1962r1, Gain analysis for coordinated AP transmissions [6] 23/1912r1, Coordinated TDMA Procedure [7] 23/1085r0, Thoughts on Coordinated TDMA [8] 23/1910r1, Coordinated TDMA (Follow up) [9] 24/0441r0, TXOP Return in C-TDMA [10] 24/0093r1, NAV setting for Coordinated TDMA [11] 24/0227r1, TXOP Protection in C-TDMA [12] 24/0387r0, TXOP Sharing for C-BF transmission Submission Slide 10 Klaus Doppler, et.al, Nokia
