EDCA-Based Preemption Mechanisms for Target STA Prioritization
Explore the IEEE 802.11 standard proposal for prioritizing low latency data transmission of target STAs during a DL TXOP using EDCA-based preemption mechanisms. The document discusses the background, motivation, and solutions for handling aperiodic low latency traffic efficiently. Learn how EDCA-based preemption helps target STAs transmit data without contention, improving overall efficiency in DL TXOP scenarios.
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January 2024 doc.: IEEE 802.11-24/416r0 Mar 2024 Target STA Prioritization in EDCA-based Preemption Mechanisms during a DL TXOP Date: 2024-03-08 Authors: Name Mingyu LEE Jack Jonghyo Lee Jaheon Gu Jonghoe Koo Seongho Byeon Jinho Choi Taeyoung HA Affiliations Samsung Electronics Address 34, Seongchon-gil, Seocho-gu, Seoul, Republic of Korea Phone email mg0218.lee@samsung.com Submission Slide 1 Mingyu Lee et al., Samsung Electronics
doc.: IEEE 802.11-24/416r0 Mar 2024 Background (1/2) Preemption Preemption was discussed in [1] as a general solution to support low latency (LL) application Preemption techniques for supporting LL application has been discussed [2-3] Among the techniques, EDCA-based preemption mechanism was discussed to handle aperiodic LL traffic [3] This document proposes to prioritize the LL data transmission of target STA in DL TXOP based on EDCA-based preemption mechanism Submission Slide 2 Mingyu Lee et al., Samsung Electronics
doc.: IEEE 802.11-24/416r0 Mar 2024 Background (2/2) EDCA-based Preemption Mechanisms in [3] Solution for UL LL Traffic arriving during a DL TXOP AP sends a preemption enabled (PR) indication to LL STAs and will perform the next DL PPDU transmission PIFS after the BA in case no associated STA sends a preemption indication (PRI) LL STAs can send a PRI within PIFS (e.g. SIFS after the BA) and then start contending by ignoring the NAV set by the AP in previous frames Target STA of DL TXOP joins as one of LL STAs if UL LL Data transmission is required Target STA sends ACK as response to DL PPDU1 Target STA can send a PRI within PIFS and then start contending with other LL STAs for preemption Submission Slide 3 Mingyu Lee et al., Samsung Electronics
doc.: IEEE 802.11-24/416r0 Mar 2024 Motivation UL LL Data Transmission of Target STA without Contention Target STA is a potential UL LL STA in EDCA-based mechanisms Target STA transmission could be failed because of collision or other transmissions - Target STA contends with other UL LL STAs after PRI - If the transmission of target STA is collided with other transmissions, target STA fails to send its data - If one of other UL LL STA sends its LL data earlier than target STA, target STA fails to send its data If target STA can be prioritized, target STA can send its data without contention - DL TXOP can be used more efficiently because target STA does not need to contend with others . Target STA : LL data transmission without contention, other STAs : Contention without target STA Submission Slide 4 Mingyu Lee et al., Samsung Electronics
doc.: IEEE 802.11-24/416r0 Mar 2024 Proposal Target STA Prioritization in EDCA-based Preemption during DL TXOP EDCA-based mechanism is the baseline operation - e.g., if target STA has no LL data, the operation is same as in [3] If target STA has LL data, response (ACK) to < DL PPDU 1 + PR enabled > includes PRT (PRI only for Target STA) and UL LL data can be sent after SIFS - Other LL STAs shall not send PRI if PRT is included in the response (i.e., ACK frame of target STA) If target STA needs to send an additional LL data, UL LL data includes PRT AP may includes PRT if UL LL data with PRT is received - Otherwise, AP may includes PR enabled as in [3] Submission Slide 5 Mingyu Lee et al., Samsung Electronics
doc.: IEEE 802.11-24/416r0 Mar 2024 Examples for Target STA Prioritization in EDCA-based Preemption Mechanisms during a DL TXOP Submission Slide 6 Mingyu Lee et al., Samsung Electronics
January 2024 doc.: IEEE 802.11-24/416r0 Mar 2024 Summary Target STA prioritization in EDCA-based preemption is proposed Proposal enhances the overall efficiency of DL TXOP preemption Target STA can send UL LL data without contention Contention can be slightly weakened by omitting target STA from the total # of LL STAs If preemption mechanism in a DL TXOP in 11bn is considered, target STA prioritization with EDCA-based preemption can be discussed further Submission Slide 7 Mingyu Lee et al., Samsung Electronics
January 2024 doc.: IEEE 802.11-24/416r0 Mar 2024 References [1] 11-23/0092, Preemption [2] 11-23/798, Preemption-for-low-latency-application-follow-up [3] 11-23/1886, Preemption-techniques-to-meet-low-latency-ll-targets Submission Slide 8 Mingyu Lee et al., Samsung Electronics
