Re: [STDS-802-11-TGBQ] Discussion on solution to address the issue cause

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Hi Jianhan,

Thank you for the question. Let me describe it more accurately.

The transmitter starts CCA in advance to make sure to send NDPs before the start time or at the start time.

The CCA shall be failed at the start time (channel is busy before the CCA backoff duration expires.). In this case, I prefer to cancel the BE to avoid complexity.

I think we have time to make the solution more mature.

BR,

Xiangxin Gu

Institute of Communication Technology

From: Jianhan Liu <Jianhan.Liu@xxxxxxxxxxxx>
Sent: Friday, September 18, 2026 6:13 AM
To: 顾祥新 (Xiangxin Gu) <Xiangxin.Gu@xxxxxxxxxx>; STDS-802-11-TGBQ@xxxxxxxxxxxxxxxxx
Subject: RE: [STDS-802-11-TGBQ] Discussion on solution to address the issue caused by CCA in beam establishment

Hi Xiangxin,

I think there are enough discussions on this topic, and we should make progress this time.

Your proposal to start CCA in advance to guarantee the transmission at the fixed start time seems not valid. The time duration of channel “BUSY” is random, start CCA in advance cannot guarantee the channel becomes “idle” at the start time.

Your Extra NDP ideas have nothing to do with the motions, we can discuss on your idea in the following sessions.

Hopefully, we can make some progress in this meeting.

Thanks,

Jianhan

From: 顾祥新 (Xiangxin Gu) <000046f9987a2d10-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Thursday, September 17, 2026 1:54 PM
To: STDS-802-11-TGBQ@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBQ] Discussion on solution to address the issue caused by CCA in beam establishment

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Hi 11bqer,

During the AM2 session yesterday, there are several contributions and proposals addressing the issue.

Here I propose a simpler solution, for discussion.

Contribution 26/1910 introduces a solution to solve timing uncertainty issue.
With the solution, the issue caused by CCA in beam establishment can also be solved for random backoff in CCA for accessing the channel to transmit BE NDPs is a kind of timing uncertainty.

The following is the illustration of the method. (I also upload a document 26/1860 to the mentor on this. )

Could the motions related on this topic be deferred to leave time for further discussion ?

BR,

Xiangxin Gu

Institute of Communication Technology

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Re: [STDS-802-11-TGBQ] Discussion on solution to address the issue caused by CCA in beam establishment