CW value after UL MU procedure
The September 2016 document discusses the CW value after UL MU procedure in IEEE 802.11-16/1181r0. It covers topics such as EDCA rules, EDCAF behavior, and STA operations. The document provides insights into backoff procedures, CW initialization, and EDCA states post UL MU. It emphasizes the importance of defining rules for CW initialization and EDCAF idle states to optimize transmission efficiency in WLAN systems.
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September 2016 doc.: IEEE 802.11-16/1181r0 CW value after UL MU procedure Date: 2016-MM-DD Authors: Name Woojin Ahn Affiliations Address WILUS Phone +82-2-552- 0110 email woojin.ahn@wilusgroup.c om john.son@wilusgroup.co m 48 Mabang-ro, Seocho-gu, Seoul, Korea John (Ju-Hyung) Son Geonjung Ko greg.ko@wilusgroup.com minseok.noh@wilusgroup .com jinsam.kwak@wilusgroup .com Minseok Noh Jin Sam Kwak Submission Slide 1 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 Recap: UL MU EDCA backoff procedure STA resumes it EDCAF after UL MU regardless of success or failure Submission Slide 2 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 EDCA rules after UL MU After UL MU, STA could use the remaining BO timer for SU transmission as usual The BO timer will decrease as soon as the channel gets idle The value of BO counter and CW of the corresponding AC will follow the general EDCA rules When the BO counter reaches zero, AC VO AC VO empty Resume EDCA after UL MU BO[VO]: 4 BO[VO]: 4 BO[VO]: 0 SU TF TID1 TID3 M-BA AIFS Submission Slide 3 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 CW value after UL MU If every MSDUs of an AC are successfully transmitted in UL MU, EDCAF will run for empty queue The BO timer will decrease as soon as the channel gets idle The EDCAF will turn into idle state When the BO timer reaches to zero The CW value may not be initialized appropriately after UL MU AC VO AC VO empty Resume EDCA after UL MU BO[VO]: 4 CW[VO]:127 BO[VO]: 4 CW[VO]:127 BO[VO]: 0 CW[VO]:127 Idle TF TID1 TID3 M-BA AIFS Submission Slide 4 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 CW value after UL MU It is necessary to define rules and conditions for CW initialization after UL MU procedure It is better to initialize CW[AC] value when the EDCAF enters into the idle state Unless, the STA may draw longer BO counter when the EDCA backoff procedure is invoked by new MSDUs AC VO AC VO AC VO empty empty Resume EDCA after UL MU BO[VO]: 67 CW[VO]:127 BO[VO]: 4 CW[VO]:127 BO[VO]: 4 CW[VO]:127 Idle Busy TF TID1 TID3 M-BA AIFS Submission Slide 5 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 Proposal We propose to initialize CW[AC] when the remaining BO counter reaches zero and the channel gets idle and the EDCA queue[AC] is empty after UL MU procedure If any leftover or new MSDUs are enqueued, then EDCAF follows the baseline backoff procedure AC VO AC VO AC VO empty empty BO[VO]: 9 CW[VO]: CWmin[VO] BO[VO]: 4 CW[VO]:127 BO[VO]: 4 CW[VO]:127 BO[VO]: 0 CW[VO]: CWmin[VO] Reset CW to CWmin Idle Busy TF TID1 TID3 M-BA AIFS Submission Slide 6 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 Conclusion In this contribution, we have addressed an issue on CW values of non-AP STAs after UL MU procedure we proposed to define a rule for initializing CW values after UL MU procedure Submission Slide 7 Woojin Ahn et al., WILUS
September 2016 doc.: IEEE 802.11-16/1181r0 Strawpoll Do you agree to adopt the spec text change as below: 10.22.2.2 EDCA backoff procedure When an HE STA successfully receives the corresponding acknowledgement frame in response to the MPDU sent in HE trigger based PPDU, the backoff for the associated EDCAF resumes the backoff counter countdown. If the remaining backoff counter reaches to zero and no data exists for that AC, the CW[AC] value shall be set to CWmin[AC] Y/N/A Submission Slide 8 Woojin Ahn et al., WILUS
