IEEE 802.11-16/1456r0 A-MPDU Aggregation Details
This document discusses the aggregation possibilities of different trigger frames like Basic Trigger, MU-BAR Trigger, and more with data, management, and control frames in IEEE 802.11-16/1456r0. It explores the constraints and allowances for aggregating various frames, providing insights into efficient A-MPDU handling.
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Nov 2016 doc.: IEEE 802.11-16/1456r0 A-MPDU Contents Date: 2016-11-06 Authors: Name Affiliation Address Phone Email 5488 Marvell Lane, Santa Clara, CA, 95054 Liwen Chu Marvell 408-222-2500 liwenchu@marvell.com Submission Slide 1 Liwen Chu, Marvell, et. al.
Nov 2016 doc.: IEEE 802.11-16/1456r0 Recap of Trigger Frames Trigger frame can be Basic Trigger, MU-BAR Trigger, Beamforming Report Poll Trigger, MU-RTS, BSRP (Buffer Status Report Poll) Trigger. It is clear that MU-RTS can t be aggregated in A-MPDU with data/management frames and/or control frame since MU-RTS can only be in legacy PPDU. It is clear Basic Trigger can be aggregated with data/management frames and/or control frame since the acknowledgement of DL A-MPDU is scheduled by Basic Trigger. Whether MU-BAR, Beamforming Report Poll Trigger, and BSRP can be aggregated with data/management frames should be clarified. Whether MU-BAR, Beamforming Report Poll Trigger, and BSRP can be aggregated with control frames should be clarified. Submission Liwen Chu, Marvell, et. al. 2
Nov 2016 doc.: IEEE 802.11-16/1456r0 Trigger Aggregation with data frames Submission Liwen Chu, Marvell, et. al. 3
Nov 2016 doc.: IEEE 802.11-16/1456r0 MU-BAR, BeamformingReport PollTriggerandBSRP MU-BAR in SU PPDU can ask for acknowledgement from multiple STAs. MU-BAR is not allowed to be aggregated with data frame since If unicast data frames in A-MPDU ask for immediate acknowledgement, Ack Policy 00 should be used. Disallowing MU-BAR is similar to disallow BAR. It is not necessary to aggregate broadcast data frames and MU-BAR to destine to different STAs. Beamforming Report Poll Trigger is used for ask for sounding feedback from beamformees. Beamforming Report Poll Trigger is not allowed to be aggregated with data frame since This makes sounding procedure complicated. Submission Liwen Chu, Marvell, et. al. 4
Nov 2016 doc.: IEEE 802.11-16/1456r0 MU-BAR, BeamformingReport PollTriggerandBSRP MU-BAR, BeamformingReport PollTriggerandBSRP BSRP asks for buffer status from STAs. Option 1: BSRP Trigger is not allowed to be aggregated with data frame since With Basic Trigger aggregated with data frames in DL A-MPDU, the STA of the DL A- MPDU receiver can report buffer status if there is remaining medium time after acknowledgement transmission. A separate BSRP can always be sent separately. Option 2: BSRP Trigger is allowed to be aggregated with data frame if the receiver announce that it supports such aggregation If BSRP Trigger is aggregated with data frames and data frames ask for acknowledgment, the STA shall transmit acknowledgement first. The remained medium time is used for buffer status report through HE Control field or QoS Mull frames. Submission Liwen Chu, Marvell, et. al. 5
Nov 2016 doc.: IEEE 802.11-16/1456r0 Trigger Aggregation with Control frames Submission Liwen Chu, Marvell, et. al. 6
Nov 2016 doc.: IEEE 802.11-16/1456r0 MU-BAR, BeamformingReport PollTriggerandBSRP Beamforming Report Poll Trigger is not allowed to be aggregated with control frame since This makes sounding procedure complicated. MU-BAR is not allowed to be aggregated with control frame since BA + MU BAR is not normal. Submission Liwen Chu, Marvell, et. al. 7
Nov 2016 doc.: IEEE 802.11-16/1456r0 MU-BAR, BeamformingReport PollTriggerandBSRP MU-BAR, BeamformingReport PollTriggerandBSRP BSRP asks for buffer status from STAs. Option 1: BSRP Trigger is not allowed to be aggregated with control frame since With Basic Trigger aggregated with data frames in DL A-MPDU, the STA of the DL A- MPDU receiver can report buffer status if there is remaining medium time after acknowledgement transmission. A separate BSRP can always be sent separately. Option 2: BSRP Trigger is allowed to be aggregated with control frame if the receiver announce that it supports such aggregation If BSRP Trigger is aggregated with data frames and data frames ask for acknowledgment, the STA shall transmit acknowledgement first. The remained medium time is used for buffer status report through HE Control field or QoS Mull frames. Submission Liwen Chu, Marvell, et. al. 8
Nov 2016 doc.: IEEE 802.11-16/1456r0 MU-BAR, BeamformingReport PollTriggerandBSRP Summary In order to simplify the implementation, we propose to disallow aggregating Beamforming Report Poll Trigger, MU-BAR in A-MPDU with other control, data/management frames to allow aggregating BSRP with other control, data/management frames in A-MPDU as optional in RX Submission Liwen Chu, Marvell, et. al. 9
