IEEE 802.11-24 Coexistence Feedback Mechanism
A-MPDU Coexistence Feedback
Date:
2024-01-04
January 2024
Michail KOUNDOURAKIS, Samsung
Slide 1
Authors:
Abstract
This submission proposes a mechanism to mitigate problems with coex during
A-MPDU reception
Slide 2
Michail KOUNDOURAKIS, Samsung
January 2024
Problem
•
A STA might be unable to receive an MPDU in an A-MPDU because of
coex issues
•
If the recipient STA does not ack MPDUs for this reason, the originating
STA will typically assume a channel problem and reduce the rate for
subsequent transmissions
•
This worsens the problem, since the consequent increased PPDU duration
increases the likelihood of coex collision
•
In the worst case, the rate is reduced so much that even a single MPDU
does not fit between consecutive coex events; as a result data flow stops and
the link is dropped
Slide 3
Michail KOUNDOURAKIS, Samsung
January 2024
Solution
•
Extend the BlockAck frame(s) to carry information to help the originator
distinguish between coex issues and channel issues
•
Coex issues might include hidden node issues, if these can be identified
•
Specifically, return
1.
The number of bad A-MPDU subframe headers / bad MPDU FCSes received
•
Can’t be a perfect count of missed MPDUs, since if A-MPDU subframe header is corrupted
resync to next header is not guaranteed
•
No counting when didn’t even try to receive, due to coex issues
2.
The cumulative away time during the PPDU
Slide 4
Michail KOUNDOURAKIS, Samsung
January 2024
Possible originator behaviour
•
If the originator had many MPDUs unacknowledged:
•
If the recipient only reported a few bad MPDUs/subframes and a significant cumulative
away time, the originator could surmise the recipient was just away due to coex issues for
the unacked MPDUs, and use this as a hint not to change the rate
•
If the recipient reported many bad MPDUs/subframes, the originator could surmise bad
radio conditions, and use this as a hint to rate-adapt
•
If the recipient only reported a few bad MPDUs/subframes and a zero or small cumulative
away time, or there was no BA, the originator could surmise really bad radio conditions, and
use this as a hint to rate-adapt
Slide 5
Michail KOUNDOURAKIS, Samsung
January 2024
Straw poll
BlockAcks should be extended to provide information on bad
MPDUs/subframes and cumulative away time for previous PPDU, so that
the originator can try to distinguish coex issues from channel issues
Y
N
A
Slide 6
Michail KOUNDOURAKIS, Samsung
January 2024
doc.: IEEE 802.11-yy/xxxxr0
Month Year
John Doe, Some Company
Page
This submission presents a mechanism to address coexistence issues during A-MPDU reception in IEEE 802.11 networks. It proposes extending BlockAck frames to provide originators with information to distinguish between coex issues and channel problems.
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Presentation Transcript
January 2024 doc.: IEEE 802.11-24/0002r0 A-MPDU Coexistence Feedback Date: 2024-01-04 Authors: Name Michail KOUNDOURAKIS Ian HUNTER Affiliations Samsung Cambridge Solution Centre Samsung Cambridge Solution Centre Samsung Cambridge Solution Centre Device Solutions Research America, Samsung Semiconductor Address SJH, CB4 0DS, U.K. Phone +44 1223 434600 email m.koundou@partner.sams ung.com i.hunter@samsung.com SJH, CB4 0DS, U.K. +44 1223 434600 at samsung (a global commercial entity) I'm the letter emme then dot rison srini.k1@samsung.com Mark RISON SJH, CB4 0DS, U.K. +44 1223 434600 Srini KANDALA 3655 N 1st St, San Jose, California, USA +1 408 5444000 Submission Slide 1 Michail KOUNDOURAKIS, Samsung
January 2024 doc.: IEEE 802.11-24/0002r0 Abstract This submission proposes a mechanism to mitigate problems with coex during A-MPDU reception Submission Slide 2 Michail KOUNDOURAKIS, Samsung
January 2024 doc.: IEEE 802.11-24/0002r0 Problem A STA might be unable to receive an MPDU in an A-MPDU because of coex issues If the recipient STA does not ack MPDUs for this reason, the originating STA will typically assume a channel problem and reduce the rate for subsequent transmissions This worsens the problem, since the consequent increased PPDU duration increases the likelihood of coex collision In the worst case, the rate is reduced so much that even a single MPDU does not fit between consecutive coex events; as a result data flow stops and the link is dropped Submission Slide 3 Michail KOUNDOURAKIS, Samsung
January 2024 doc.: IEEE 802.11-24/0002r0 Solution Extend the BlockAck frame(s) to carry information to help the originator distinguish between coex issues and channel issues Coex issues might include hidden node issues, if these can be identified Specifically, return 1. The number of bad A-MPDU subframe headers / bad MPDU FCSes received Can t be a perfect count of missed MPDUs, since if A-MPDU subframe header is corrupted resync to next header is not guaranteed No counting when didn t even try to receive, due to coex issues 2. The cumulative away time during the PPDU Submission Slide 4 Michail KOUNDOURAKIS, Samsung
January 2024 doc.: IEEE 802.11-24/0002r0 Possible originator behaviour If the originator had many MPDUs unacknowledged: If the recipient only reported a few bad MPDUs/subframes and a significant cumulative away time, the originator could surmise the recipient was just away due to coex issues for the unacked MPDUs, and use this as a hint not to change the rate If the recipient reported many bad MPDUs/subframes, the originator could surmise bad radio conditions, and use this as a hint to rate-adapt If the recipient only reported a few bad MPDUs/subframes and a zero or small cumulative away time, or there was no BA, the originator could surmise really bad radio conditions, and use this as a hint to rate-adapt Submission Slide 5 Michail KOUNDOURAKIS, Samsung
January 2024 doc.: IEEE 802.11-24/0002r0 Straw poll BlockAcks should be extended to provide information on bad MPDUs/subframes and cumulative away time for previous PPDU, so that the originator can try to distinguish coex issues from channel issues Y N A Submission Slide 6 Michail KOUNDOURAKIS, Samsung
