Enhancements to Link Adaptation Feedback in IEEE 802.11-20
Improve link adaptation feedback in IEEE 802.11-20 by addressing current system limitations such as accuracy issues in MCS suggestion, infrequent feedback, and lack of support for advanced configurations. Suggested changes include attaching feedback frames to BA, estimating channel quality based on received PPDU, and using reserved bits for feedback indication.
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Jan 2020 doc.: IEEE 802.11-20/0047r0 Feedback Enhancement Date: 2020-01-15 Authors: Name Affiliations Address Phone email Ruchen Duan Samsung r.duan@samsung.com Wook Bong Lee Samsung wookong.lee@samsung.com Mostafa Ibrahim Samsung ms.ibrahim@samsung.com Srinivas Kandala Samsung srini.k1@samsung.com Ashok Ranganath Samsung ashok.r@samsung.com Submission Slide 1 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Introduction CQI or Link adaptation feedback is crucial to the system throughput HE Compressed Beamforming/CQI frames contains the CQI report in sounding procedures HLA frame is introduced in 11ax standard to report the link adaptation feedback Receiver informs transmitter suggested MCS and NSS for certain RU and BW NDPA and NDP NDPA and NDP Downlink Data Downlink Data ... AP ... ... ... ... BA Uplink Data and HLA Compressed BF/CQI frame Compressed BF/CQI frame STA BA BA Sounding procedure Link adaptation report Sounding procedure Submission Slide 2 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Downside of Current Systems HE Compressed Beamforming/CQI frames Convey SNR only, may not suggest proper MCS due to different estimation algorithms at Tx and Rx side When sounding procedure is less frequent, estimation becomes less accurate due to channel aging HLA frame can be attached with data and management frames, and provide more link adaptation feedback Since HTC cannot be attached with control frames, the HLA report is only transmitted when there is data/management frames LA Feedback for downlink transmission is less frequent and less timely All MPDUs in one A-MPDU must contain same HTC field, and have larger overhead The current HLA frames cannot support 320MHz and 16SS due to limitation of bits Submission Slide 3 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Suggested Changes For each BA, the link adaptation feedback frame can be attached Channel quality information can be estimated based on previously received PPDUs Can use BA control reserved bits to indicate appearance of link adaptation feedback (LAFB) frame Can be attached with other BA subfield in BA information field LA FB Use reserved bit to indicate appearance of LAFB Attach LAFB to BA information Submission Slide 4 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Suggested Changes For each BA, the link adaptation feedback frame can be attached NDPA and NDP NDPA and NDP Downlink Data Downlink Data Downlink Data AP ... ... ... ... ... Compressed BF/CQI frame BA and LA BA and LA BA and LA Compressed BF/CQI frame STA Link adaptation report Link adaptation report Link adaptation report Sounding procedure Sounding procedure Feedback can be provided more frequently Especially for MU-MIMO case, AP may have problem pick proper MCS for each STA. By adding the LAFB with BA, link adaptation can be done within one round of packet exchange Submission Slide 5 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Summary Discussed about the current CQI and link adaptation feedback designs in 11ax standard Explain the downside of the current designs Proposed a new design for 11be system Submission Slide 6 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 SP 1 Do you agree to support a link adaptation report in the block ack? Y: N: A: Submission Slide 7 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 SP 2 Do you agree to use the BA control field to indicate the appearance of the LA field? Y: N: A: Submission Slide 8 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Reference Submission Slide 9 Ruchen Duan, Samsung
Jan 2020 doc.: IEEE 802.11-20/0047r0 Current BA Design BA frame format BA control variant Reserved bits can be reused to indicate appearance of link adaptation feedback field in BA information field Submission Slide 10 Ruchen Duan, Samsung
