IEEE 802.11-19/1505r2 Multi-link TXOP Aggregation Considerations
Explore the impact and considerations of multi-link TXOP aggregation in IEEE 802.11-19/1505r2, focusing on boosting medium access for high throughput applications and minimizing negotiation overhead for link switching. The presentation delves into the backoff procedures, aggregated link considerations, and examples of TXOP aggregation with RTS/CTS exchanges.
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Presentation Transcript
Sept 2019 doc.: IEEE 802.11-19/1505r2 Multi-link TXOP Aggregation Considerations Date: 2019-10-31 Authors: Name Sharan Naribole Affiliations Samsung Address Phone email n.sharan@samsung.com Srinivas Kandala Samsung Wook Bong Lee Samsung Ashok Ranganath Samsung Submission Slide 1 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Introduction Multi-link Operation o Transmission of frames of a TID over multiple links [1] o Minimizing negotiation overhead for fast link switching [2] Multi-link TXOP Aggregation o Introduced in a few contributions [3,4,5] o Mechanism to boost medium access for non-STR STAs (defined in [6]) and high throughput applications o Link with backoff countdown to 0 can aggregate second link if idle (e.g. for PIFS) o Per-link PPDU provides more flexibility due to diverse link conditions Submission Slide 2 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Multi-link TXOP Aggregation Impact Multi-link gain presented in a few contributions including TXOP aggregation [5,7] In addition, we need to consider multi-link BSS with varying distribution of single link STAs and multi-link STAs In this presentation, we focus on impact of multi-link aggregation on single link STAs in multi-link BSS Submission Slide 3 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Aggregated link Backoff Procedure In single link operation, CW resets to CW min upon successful transmission Backoff counter did not reach zero on aggregated link prior to TXOP Resetting CW to CW min on aggregated link can be unfair to single link STAs Proposal: CW remains same as prior to TXOP on aggregated link and backoff counter resumes from value prior to TXOP Failed transmission case can follow existing backoff procedure Backoff countdown resumes with same value link A TXOP TXOP busy 3 2 1 0 9 8 7 6 5 4 3 ML STA TXOP: ML STA s TXOP Busy: other traffic busy TXOP link B busy 5 4 3 2 1 0 Submission Slide 4 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Multi-link TXOP Aggregation with RTS/CTS Example multi-link TXOP aggregation performed at a non-STR STA RTS-CTS exchange performed on both links When RTS-CTS exchange fails on one link, transmission still performed on other link Submission Slide 5 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Unidirectional Aggregation Aggregation considered so far is bi-directional (link A invites link B and vice versa) Scenario: Single link STAs operating on link A and multi-link aggregation enabled In worst case, starvation of single link STAs if link B has no traffic other than of ML STAs o Mean backoff value on link B is smaller than mean backoff value on link A o Access delay on link B is smaller than access delay on link A Proposal: Unidirectional Aggregation mode o Aggregation limited from link A to link B o Link A with backoff 0 can aggregate link B if link B is idle o Link B with backoff 0 cannot aggregate link A even if link A is idle link A TXOP TXOP Single link STA ML STA TXOP: ML STA s TXOP Busy: other traffic 3 2 1 0 2 1 0 5 4 3 2 busy busy busy TXOP TXOP link B 2 1 0 Submission Slide 6 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 Summary Fairness for single link STAs needs to be considered in design of multi-link aggregation protocol design Backoff procedure on aggregated link needs further consideration Unidirectional aggregation mode can benefit single link STAs in certain scenarios Submission Slide 7 Sharan Naribole (Samsung), et al.
Sept 2019 doc.: IEEE 802.11-19/1505r2 References [1] 11-19/979, EHT Multi-link Operation Follow-up [2] 11-19/822, Extremely Efficient Multi-band Operation [3] 11-19/1116, Channel Access in multi-band operation [4] 11-19/1144, Channel Access for Multi-link Operation [5] 11-19/1291, Performance Aspects of Multi-link operations [6] 11-19/1405, Multi-link Operation Channel Access Discussion [7] 11-19/764, Multi-link Aggregation Gain Analysis Submission Slide 8 Sharan Naribole (Samsung), et al.
