Proposal for Random Access Efficiency Enhancement in IEEE 802.11be Networks

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This document presents a proposal for enhancing random access efficiency in IEEE 802.11be networks through a Random-Access NFRP (RA-NFRP) principle. The proposal addresses the challenges of low efficiency in the current UORA procedure and introduces modifications based on the 802.11ax standard to improve scalability and efficiency. The key points of the proposal include details on how RA-NFRP works, its benefits, and its implementation for better performance in random access scenarios.

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  1. December 2020 doc.: IEEE 802.11-20/1903r0 Random Access for 11be Date: 2020-11-30 Authors: Name Stephane Baron Affiliations Canon Address Rue de la touche Lambert, Rennes Phone email stephane.baron@crf.canon.fr Patrice Nezou Canon patrice.nezou@crf.canon.fr Pascal Viger Canon pascal.viger@crf.canon.fr Submission Slide 1 Stephane Baron (Canon), et al

  2. December 2020 doc.: IEEE 802.11-20/1903r0 Outline Key Points on Random Access Proposal: Random-Access NFRP (RA-NFRP) for 802.11be RA-NFRP Principle Illustration RA-NFRP Efficiency versus UORA Scalability towards 802.11 technologies or services Annex Legacy 802.11ax UORA procedure Legacy 802.11ax NFRP procedure Details on RA-NFRP (advantages, example format) Submission Slide 2 Stephane Baron, (Canon), et al

  3. December 2020 doc.: IEEE 802.11-20/1903r0 Key points UORA provides low efficiency [1]: empty RUs 37%, collision 26%, efficiency 37% lost random RUs (either unused or collided) occur on large transmission durations Random Access still required for 11be ! Many contributions about 11be design TF report that random-access support becomes now difficult : 11/831r1, 11/840r0, 11/1192r0 Build a RA based on NFRP: Triggered PPDU is universal (only energy in RU Tone set) By offering greater efficiency Submission Slide 3 Stephane Baron, Canon, et al

  4. December 2020 doc.: IEEE 802.11-20/1903r0 Proposal: Random-Access NFRP (RA-NFRP) RA-NFRP Principle: (details in Annex slide 13) Based on 802.11ax NFRP with following modifications : RA-NFRP TF identified by predefined Starting_AID value Typically value 0 Optionally: 2047 (all stations), or a BSSID index (stations belonging to a BSS) Random Access to access a RU Tone, by a STA : 1st random phase: STA randomly selects a RU Tone Set Index 2nd random phase: STA randomly selects a Feedback Status Easy Collision detection AP considers as correct a feedback where only one RU tone is used (single feedback) Next, UL Data transmission: AP can schedule (in Basic TF) the responding STAs by the index of RU Tone Set , corresponding to RU Tone Set with a single feedback Submission Slide 4 Stephane Baron, Canon, et al

  5. December 2020 doc.: IEEE 802.11-20/1903r0 RA-NFRP Illustration Random access: RA-NFRP identification : startingAID = 0, 2047, Basic TF scheduling: AP schedules STAs using RU Tone Set index - select random RU Tone Set index (e.g. using backoff) - FEEDBACK_STATUS is random AP AP AP A NDP (sent by STA1) 26 tone RU Basic Trigger Frame Data frame (sent by STA1) B Primary 20MHz NFRP Trigger Frame (242 tones) channel (schedule RUs by using RU_TONE _SET_IND EX ) collided C 26 tone RU Multi-STA BA Collided Data frame (sent by at least 2 STAs) (starting AID = 0) NDP (sent by STA20) D NDP (sent by STA2) SIFS SIFS SIFS SIFS Case NDP Feedback detection by AP Comment A correct (single feedback) One single STA transmits a TB NDP Feedback B Not used (no feedback) No further RU scheduled C correct !! (2 STAs use same feedback value) RA-NFRP can not detect the error ! : collided data will not be acknowledged D Error (two feedbacks) 2 tone sets used as Feedback (tones for 0 and 1, so feedback=3) Submission Slide 5 Stephane Baron, Canon, et al

  6. December 2020 doc.: IEEE 802.11-20/1903r0 RA-NFRP Efficiency RA-NFRP is a very efficient RA mechanism : Early Collision detection: performed on NDP feedback (not during Data transmission) : reduce wasted data RUs Enhanced collision detection: half of collisions are detected (e.g. when RU Tone Sets made of two groups of tones) Detection of Empty NDP RU will avoid having empty data RU Efficiency for RA scheme Global efficiency Empty NDP RUs Collided NDP RUs Empty data RUs Collided data RUs 37% UORA - - 37% 26% RA-NFRP + Basic TF 26% / 2 = 13% 74% 37% 26% 0 = 37 / (37 + 26/2) The 37% of empty NDP Tones are not scheduled for data 26% of Aloha collision, halfed by 2-bit feedback Submission Slide 6 Stephane Baron, Canon, et al

  7. December 2020 doc.: IEEE 802.11-20/1903r0 RA-NFRP scalability As only energy is received as NFRP feedback, AP needs to know what kind of station it will address. There is room in User Info field of NFRP format to signal the technologies to schedule/trigger subsequent transmissions: 9 bits in the reserved field (see examples in Annex slide 16) Could be used to signal a given technology Basic 11ax TF, Basic 11be TF, future version, or given service or usage : multi-AP TF Submission Slide 7 Stephane Baron, Canon, et al

  8. December 2020 doc.: IEEE 802.11-20/1903r0 Summary This document presented a Random Access procedure for 11be, on top of NFRP mechanism. Efficiency is close to 74%, extremely greater than the legacy UORA (37%). Scalable to future versions of the 802.11 standard We think 802.11be would largely benefit from such mechanism. Submission Slide 8 Stephane Baron, (Canon), et al

  9. December 2020 doc.: IEEE 802.11-20/1903r0 Straw Poll #1 Do you support that 802.11be shall define a more efficient Random-Access mechanism ? NFRP-based solution is one candidate. Results: Y/N/A Submission Slide 9 Stephane Baron, (Canon), et al

  10. December 2020 doc.: IEEE 802.11-20/1903r0 Annex Submission Slide 10 Stephane Baron, Canon, et al

  11. December 2020 doc.: IEEE 802.11-20/1903r0 Recall: UL OFDMA-based Random Access (UORA) UORA allows a non-AP HE STA to access one of a number of resource units designated for random access by the HE AP [1]. UORA provides low efficiency: theoretical probability for random access distributions (Slotted- Aloha type): empty RUs 37%, collision 26%, efficiency 37% lost random RUs (either unused or collided) occur on large transmission durations ! 802.11be needs a more efficient RA mechanism ! Submission Slide 11 Stephane Baron, Canon, et al

  12. December 2020 doc.: IEEE 802.11-20/1903r0 Recall : 802.11ax NFRP procedure NDP Feedback Report Poll (NFRP) TF is used to collect feedback from a range of associated STAs [1]: STAs are identified by a range of AIDs, starting from value of Starting_AID field Scheduled STAs select a tone set according to STA s RU_TONE_SET_INDEX ([1] table 27-32), and modulate tones of the tone set according to the FEEDBACK_STATUS (0/1) to emit. Later, based on received NDP feedbacks, AP may solicit (e.g. via Basic TF for UL MU) some responding STAs e.g. Feedback is 0 Illustration: e.g. Feedback is 1 Submission Slide 12 Stephane Baron, Canon, et al

  13. December 2020 doc.: IEEE 802.11-20/1903r0 NFRP TF format (802.11ax) 340 Submission Slide 13 Stephane Baron, Canon, et al

  14. December 2020 doc.: IEEE 802.11-20/1903r0 RA-NFRP Advantages Fully compliant with legacy 802.11ax format : Keep 11ax design format Starting AID field takes value 0 (optionally 2047 ), any predefined AID value outside the range of AID assigned by AP to associated stations Very efficient random-access mechanism random access is moved to the short time NDP Feedback report procedure AP schedules only used RU Tone Set: no empty data RUs are met in the subsequent UL MU operation Possibly still collisions on UL data RU, but half of the collisions compared to UORA(case C of previous slide) Tips: AP later determines the STA AID (at final stage upon receiving HE TB data PPDU), but this is not an issue. Submission Slide 14 Stephane Baron, Canon, et al

  15. December 2020 doc.: IEEE 802.11-20/1903r0 RA-NFRP TF format TF Techno bitmap This field tells the inquired technology. Value Description B0 B5 B6 B7 B8 0 Resource request 1 Universal request Reserved EHT HE 2-15 Reserved Bits: 6 1 1 1 Keeping conventional Feedback Type (0) or this new value (1) is TBD Submission Slide 15 Stephane Baron, Canon, et al

  16. December 2020 doc.: IEEE 802.11-20/1903r0 Reference [1]. Draft P802.11ax_D8.0 [2]. Submission Slide 16 Stephane Baron, (Canon), et al

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