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Hi Yue,
Thanks for your e-mail and suggestions. [My responses]
are below.
Best,
Serhat
From: zhaoyue (V) <zhaoyue122@xxxxxxxxxx>
Sent: Thursday, July 9, 2026 07:12 To: Serhat Erkucuk <serkucuk@xxxxxxxxxx>; STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx <STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx> Subject: 答复: [STDS-802-11-TGBN] Discussions on CRD 26/428 (Switching to NPCA primary channel when NAV is non-zero) Hi Serhat,
Thanks for your work on the problem.
I am afraid that if switching threshold is so flexible then devices can not react timely. [Serhat] I think it is rather another comparison of the MAC variable to the NAV value plus the NPCA Minimum Duration Threshold. Since the STA is not expected to communicate immediately on the NPCA primary channel, I do not see a problem even if the STA has a processing delay. What’s more, it is needed to maintain an additional variable to record NAV value at time of switching, for controlling channel access behavior. This variable is solely for preventing
channel access in non-zero basic NAV case.
[Serhat] I agree with your comment regarding the necessity of an additional variable to control the channel access. The proposed switching condition does not depend on this variable, but accessing the channel does. But I get your intention of avoiding interfering with OBSS transmission. If we are going to solve the problem, I suggest not to switch if basic NAV on BSS primary channel is non-zero. Suggested text is: e. If the STA maintains an intra-BSS NAV, it is zero at the time of the receipt of the PHYCCA.indication(BUSY) primitive associated with the PPDU. f. The basic NAV is zero at the time of the receipt of the PHYCCA.indication(BUSY) primitive associated with the PPDU. [Serhat] Your proposed suggestion simplifies the NPCA channel switching conditions but may result in a STA not able to switch to NPCA primary channel and communicate with its AP if the STA observes two different OBSSs simultaneously operating. [Serhat] Let us see the other views on the topic and we may further discuss to converge on a solution. Thanks for your consideration! [Serhat] Thanks!
Best regards, Yue Zhao
发件人: Serhat Erkucuk <serkucuk@xxxxxxxxxx>
Dear all,
I presented today the document 26/428r1, which addresses comments regarding "Switching to the NPCA primary channel" when the NAV is non-zero.
I revised the document based on the comments received during the presentation:
As there were more people queued, I am starting this thread for further comments and discussions. Looking forward to your feedback, if any.
Thanks, Serhat
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