IEEE 802.11-23/0855r0 Beam Steering for Spatial Reuse
"Explore the concept of multi-AP coordination with beamforming for spatial reuse in IEEE 802.11 networking. The discussion covers challenges, solutions, and procedures for efficient data transmission without the need for wire backhaul."
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Presentation Transcript
May 2023 Doc.: IEEE 802.11-23/0855r0 NULL beam steering based Spatial Reuse Date: 2023-05-14 Authors: Name Affiliations Address Phone email Xiangxin Gu Unisoc Xiangxin.gu@unisoc.com Yingqiao Unisoc John Yi SPRD Lei Zhou H3C Submission Slide 1 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 Background Multi-AP coordination is a candidate feature for UHR. Co-TDMA Co-OFDMA Co-SR Co-JTX Co-BF Coordinated Beamforming. [1] Each AP independently performs beamforming to reduce interference to other devices. Submission Slide 2 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 Discussion To achieve multi-AP coordinated beamforming, pre-TX information such as per-STA DL BSR, needs to be exchanged in time among AP(s). per-STA DL BSR changes timely along with many random events such as new data arrival, frame transmission, etc. Challenging task while there is no wire backhaul. Any simpler methods? No need to exchange pre-TX information No wire backhaul Submission Slide 3 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 NULL beam steering based Spatial Reuse AP1(Sharing AP) AP2(Shared AP) NULL steering STA1 STA2 A-CTS DL transmission Sharing AP ... SIFS SIFS STA1 BA BAR DL transmission Shared AP ... ... SIFS AIFS SIFS STA2 BA Submission Slide 4 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 Pre-condition The Shared AP(s) have the channel state information to execute NULL beam steering to STA1 Procedure 1. The Sharing AP EDCAs channel and sends A-CTS indicating the Shared AP(s) that NULL beam steering SR is allowed along with the following DL transmission. 2a. The Sharing AP sends a PPDU to STA1 SIFS after A-CTS. 2b. The Shared AP(s) EDCAs channel for SR, SIFS after A-CTS. The Shared AP that EDCAed channel sends a PPDU to STA2 3. STA1 BAs the frames received. 4. The Shared AP EDCAs channel to BAR STA2. Submission Slide 5 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 Further considerations A-CTS is sent by STA1. Shared AP(s) are hidden to the Sharing AP but visible to STA1 can do SR transmission. RTS DL transmission Sharing AP ... SIFS SIFS SIFS STA1 BA A-CTS BAR DL transmission Shared AP ... ... SIFS AIFS SIFS STA2 BA When and how to get channel states to STA1 for Shared AP(s)? Right after the Sharing AP executes channel sounding to STA1 Implicit sounding Submission Slide 6 Xiangxin Gu (Unisoc)
May 2023 Doc.: IEEE 802.11-23/0855r0 Reference [1] Kosuke Aio(Sony Group Corporation), System Level Simulation of Co-BF and Joint Tx 22/1821r1, November 2022. Submission Slide 7 Xiangxin Gu (Unisoc)
