IEEE 802.11-24/103r0 TXOP Level Preemption for Low Latency Application
This document discusses the implementation of preemption as a solution to support low latency applications in IEEE 802.11 scenarios. It focuses on dividing large PPDU into smaller ones with time gaps for preemption opportunities. The approach involves common preemption requests and triggering LL packet transmissions for improved efficiency in DL, UL, and UL SU scenarios.
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January 2024 doc.: IEEE 802.11-24/103r0 TXOP Level Preemption for Low Latency Application Date: 2024-01-10 Authors: Name Juan Fang Dmitry Akhmetov Minyoung Park Laurent Cariou Robert Stacey Po-kai Huang Danny Alexander Affiliations Intel Address 2111 NE 25th Ave, Hillsboro OR 97124, USA Phone email Juan.fang@intel.com Submission Slide 1 Juan Fang, Intel
January 2024 doc.: IEEE 802.11-24/103r0 Introduction Preemption was discussed in [1] as a general solution to support low latency application in different scenarios [2]. In this document, we will futher discuss how this technique can be used in the DL TB, UL SU TXOP scenario and how to send LL PPDU after preemption Submission Slide 2 Juan Fang, Intel
doc.: IEEE 802.11-24/103r0 January 2024 Recap - General solution for case A and case B [1] (Event-based or periodic LL traffic with jitters) Preemption in DL TXOP case 1. Divide the large PPDU into small PPDUs with maximum length limitation and time gaps to enable preemption opportunity for low latency (LL) transmitter 2. One or more LL transmitters can send common preemption request (PR) (similar to CTS) during the time gaps when the preemption is allowed The time gap allowed for preemption is indicated in the PPDU preceding the time gap. Shorter xIFS (??) channel access will be used for the LL transmitter (??) to send common PR. ??<?? Benefit: This avoids reserving time slot periodically within TXOP for LL traffic 3. LL packet transmission may be initiated by the AP after the reception of the common PR AP can trigger the LL STAs to send LL packet. e.g., Sending NFRP to get the LL buffer status report, then trigger the LL data transmission Slide 3 Submission Juan Fang, Intel
doc.: IEEE 802.11-24/103r0 January 2024 Preemption in UL TB case 1. Divide the large UL TB PPDU into small PPDUs with maximum length limitation and time gaps to enable preemption opportunity for LL transmitter 2. One or more LL transmitters can send common preemption request (PR) (similar to CTS) during the time gaps when the preemption is allowed The time gap allowed for preemption is indicated in the PPDU preceding the time gap or TF. Shorter xIFS (??) channel access will be used for the LL transmitter (??) to send common PR. ??<?? Benefit: This avoids reserving time slot periodically within TXOP for LL traffic 3. LL packet transmission may be initiated by the AP after the reception of the common PR AP can trigger the LL STAs to send LL packet. e.g., Sending NFRP to get the LL buffer status report, then trigger the LL data transmission Slide 4 Submission Juan Fang, Intel
Jan 2024 doc.: IEEE 802.11-24/103r0 Preemption in UL SU TXOP case 1. Divide the large UL SU PPDU into small PPDUs with maximum length limitation and time gaps to enable preemption opportunity for the AP 2. AP can send BA with PR or other ways to indicate the preemption request when the preemption is allowed 3. LL packet transmission may be initiated by the AP after the transmission of the PR Submission Slide 5 Juan Fang, Intel
xxx 2023 doc.: IEEE 802.11-24/103r0 How to enable LL PPDUs after preemption (Event-based or periodic LL traffic with jitters) 1. PR + NFRP + NFR + TF + LL PPDU [3] 2. PR + TF + UORA for LL PPDUs 3. PR + EDCA for LL PPDUs [4] 4. PR + basic TF + BSR + TF + LL PPDUs Submission Slide 6 Juan Fang, Intel
August 2023 doc.: IEEE 802.11-24/103r0 Summary Preemption can provide bounded latency while keeping low performance impact to the high throughput traffic. Further consideration: xIFS time Preemption Request frame Further overhead reduction Submission Slide 7 Juan Fang, Intel
August 2023 doc.: IEEE 802.11-24/103r0 References [1] 11-23-0092r0, Preemption [2] 11-23-0018r1, Low latency support in UHR [3] 11-23-1229r1, Preemption-for-low-latency-application-follow-up [4] 11-23-1886r0, Preemption-techniques-to-meet-low-latency-ll-targets Submission Slide 8 Juan Fang, Intel
August 2023 doc.: IEEE 802.11-24/103r0 SP Do you agree to define a mechanism in 11bn for a TXOP holder to allow a STA associated with the TXOP holder to preempt the TXOP holder's frame exchange sequence for low latency traffic delivery NOTE: The TXOP holder can be an AP or a non-AP STA and the policy for TXOP holder allowing preemption is TBD Submission Slide 9 Juan Fang, Intel
