Hi Yajun,
I apologize for my late reply to your e-mail.
As you mentioned, the intention of my submission is “If scheduled my OBSS’s R-TWT SP occurs, defer or truncate TXOP on the NPCA primary channel.”
Regarding the first concern, indeed, it’s the fundamental limitation of the current NPCA operation. With the current NPCA operation, R-TWT member STAs on the BSS primary channel due to hidden node problem or legacy STAs cannot exchange frames with their AP if the AP is operating on the NPCA primary channel. Also for the second concern, as the R-TWT channel access operation of 11be, only protection for R-TWT SP start time is defined. I would like to first add the basic fundamental rule (“If a scheduled R-TWT SP of my BSS occurs, defer or truncate TXOP on the NPCA primary channel”) to the current SFD in line with 11be baseline. Whether to allow only the AP and the R-TWT member STA to perform channel access on the BSS primary channel is an additional issue to discuss.
Thank you.
Juseong Moon 2025. 8. 26. 오후 6:19, 程亚军 <chengyajun@xxxxxxxxxx> 작성:
Hi，Juseong Thank you for your presentation. Do you mean that if a scheduled R-TWT SP occurs when the NPCA AP and NPCA non-AP STA(s) switch to the NPCA Primary Channel, then the NPCA AP/NPCA non-AP STA(s) should defer the current transmission/end the TXOP, and can exchange frames of R-TWT TID(s) on the NPCA Primary Channel? If my understanding is correct, I have the following concerns: 1. When not all of the R-TWT member STAs have switched to the NPCA Primary Channel, will the R-TWT scheduling AP still exchange frames of R-TWT TID(s) on the NPCA Primary Channel? 2. When the NPCA_TIMER expires and the R-TWTSP has not ended, what actions will the NPCA AP/R-TWT scheduling AP and the non-AP STAs/ R-TWT member STAs take? Thanks, Yajun Hi all, I plan to run the SP during the September F2F meeting session in Waikoloa. I would like to hear your thoughts or questions regarding the SP text included in the submission. The SP text is shown below. SP #1: Do you support to add the following text to the 11bn SFD? Before starting transmission of any PPDU in the TXOP obtained on the NPCA primary channel, an NPCA STA should complete its frame exchange prior to the start of the R-TWT SP, as defined in subclause 35.8.4.1(TXOP and backoff procedure rules for R-TWT SPs). If there is not enough time to complete its frame exchange prior to the start of the R-TWT SP, then the NPCA STA should defer transmission. If you have any questions or comments on the SP text or the submission, please feel free to let me know.
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