[STDS-802-11-TGBN] 答复: Re: [STDS-802-11-TGBN] Discussion on DCN 11-25-19

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Hi Liangxiao,

I would like to provide some observations regarding Option2 in document 25/1991, which is also referenced in Document 26/1101 :

1. When AP A operates on the BSS primary channel, it must simultaneously monitor DL PPDUs on the NPCA primary channel. By detecting the preambles of these DL PPDUs, AP A can collect BSS Colors from OBSSs operating on the NPCA primary channel. This process enables Option 2 to acquire OBSS color information on the NPCA primary channel.

2. When AP A (or a STA) switches from the BSS primary channel to the NPCA primary channel during NPCA operation, it shall swap the values of the two BSS Colors. This swap operation ensures compatibility with legacy devices under option2.

I would appreciate your feedback and am open to further discussion or collaboration on this topic.

Best regards,

Lei Pan

+86-18521307028

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发件人: Liangxiao Xin [mailto:xlx20190808@xxxxxxxxx]
发送时间: 2026年4月7日 11:33
收件人: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
主题: [外部邮件谨防钓鱼] Re: [STDS-802-11-TGBN] Discussion on DCN 11-25-1991 (BSS Color for NPCA)

Hi Shawn,

Thanks for the email. DCN11-26/0398 proposes the solution to avoid BSS color collision in hidden node problems. What I proposed is to discuss how to set the BSS color on the NPCA primary channel to avoid color collision in the general scenario. I think we should solve the general case first then decide how to solve a more specific issue.

Regards,

Liangxiao

On Thu, Apr 2, 2026 at 2:58 PM Shawn Kim <shawn.kim@xxxxxxxxxxxxxx> wrote:

Hi Liangxiao,

Thank you for initiating the discussion on the BSS color collision issue on the NPCA primary channel.

First, I believe that the approaches considered in Option 2 and Option 3 of 11-25/1991r1—using different BSS colors on the BSS primary channel and the NPCA primary channel—are not the preferred direction, as they would increase the operational complexity of NPCA STAs.

Therefore, the Option 1 approach, which uses the same BSS Color on both the BSS primary channel and the NPCA primary channel, appears to be the more appropriate direction.

The text proposed in 11-25/1991r1 is also aligned with Option 1, and I support this direction. However, additional consideration is needed for scenarios in which a BSS color collision occurs that the NPCA AP cannot directly detect. As you may be aware, when an OBSS that is hidden from the AP uses the same BSS color, only the non-AP STA can detect the collision. In IEEE 802.11ax, a BSS color collision report mechanism (26.17.3.5, Detecting and reporting BSS color collision) was defined to address such cases.

One possible approach would be to reuse the legacy mechanism for the NPCA primary channel. However, the current mechanism is defined only for collisions detected on the BSS primary channel. Even if the legacy mechanism were extended to the NPCA primary channel, the AP would still have no way to determine which primary channel actually experienced the collision, as the current report format lacks a field to identify the originating channel.

To address this ambiguity, changes have been proposed in 11-26/0398 to enable non-AP STAs to report collisions occurring on the NPCA primary channel and to allow the AP to identify the channel on which the collision occurred. Since CID 8011 is closely related to this issue, it may be more efficient to address CID 8011 together with the CIDs in 11-26/0398.

Best regards,

Shawn

2026년 3월 31일 (화) 오전 9:45, Liangxiao Xin <xlx20190808@xxxxxxxxx>님이 작성:

Hi everything,

I send this email to kick off the offline discussion on DCN 1991. The CID 8011 proposes the solution to solve the BSS color collision issue on the NPCA primary channel. Please feel free to provide comments and questions here. Thank you!

Regards,
Liangxiao

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Sanghyun Kim, Ph.D
WILUS Inc.
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Liangxiao Xin

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[STDS-802-11-TGBN] 答复: Re: [STDS-802-11-TGBN] Discussion on DCN 11-25-1991 (BSS Color for NPCA)