Re: [STDS-802-11-TGBN] PDT-CRs-Joint-Sounding-procedure

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Dear Yan,

Thank for reviewing.

Why Figure 37-4 for joint NDP sounding sequence follows the description for sequential sounding sequence?

[YW] I guess this was fixed early. current draft is shown as below:

[CID#3290, shift to below figure 37-3] In UHR Co-BF joint NDP sounding sequence, to collect all the required the channel state to compute a steering matrix for [CID#862] DL Co-BF transmission, both UHR Co-BF beamformer ~~APs~~ [CID#2988] shall ~~need to~~ initiate the UHR Co-BG joint NDP sounding sequence sequentially~~, i.e., total two sequences.~~ [CID#2989, remove to PHY] ~~For both UHR TB joint NDP sounding sequences, one AP conducts the frequency correction on its EHT sounding NDPs to a TBD range of the reference AP, which may be either AP1 or AP2.~~ [CID#3290] An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-4 (UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2)

Should "[CID#3290] An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-4 (UHR [CID#920] Co-BF TBjoint NDP sounding sequence initiated from AP2)” after the paragraph above Figure 37-3.

[YW] not sure I get the question, but currently, above each figure, there is a sentence to describe it. please see the below text:

An example of a UHR [CID#920] Co-BF TB sequential NDP sounding sequence initiated from AP1 is shown in Figure [CID#75] 37-1 (UHR [CID#920] Co-BF TB sequential NDP sounding sequence initiated from AP1)

An example of a UHR [CID#920] Co-BF TB sequential NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-2 (UHR [CID#920] Co-BF TB sequential NDP sounding sequence initiated from AP2)

An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP1 is shown in Figure 37-3 (UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP1).

An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-4 (UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2)

[M#375] The term UHR Co-BF beamformer refers to a MU beamformer. The term UHR Co-BF beamformee refers to a MU beamformee. A UHR Co-BF beamformee only supports full bandwidth MU feedback.

I think UHR Co-BF beam former is more than a MU beam former, which can do cross BSS sounding.

I am not sure "A UHR Co-BF beamformee only supports full bandwidth MU feedback” is accurate. If MU beamformee supports both full bandwidth and partial bandwidth MU feedback, it still can be a UHR Co-BF beamformee.

I think it is better to use "A UHR Co-BF beamformee is only required to support full bandwidth MU feedback”.

[YW] I agree Co-BF beamformer is more than a MU beamformer. I expect the defination need to be changed in EHT PHY Capabilities section. same for the Co-BF beamformee. I will take the suggested text change and will upload r4.

[M#375 and CID#966] The term UHR Co-BF beamformer refers to a UHR AP that operates as a MU beamformer. The term UHR Co-BF beamformee refers to a UHR non-AP STA that operates as a MU beamformee. A UHR Co-BF beamformee is only required to supports full bandwidth MU feedback.

Best Regards,

You-Wei Chen

Yan (PACE) Zhang <yan_zhang1010@xxxxxxxxx> 於 2025年4月23日週三下午2:34寫道：

Hi You-Wei,

I have a few questions on your document 681r1.

Page 21, [CID#3290, shift to below figure 37-3] In UHR Co-BF sequential sounding sequence, to collect all the required the channel state to compute a steering matrix for [CID#862] DL Co-BF transmission, both UHR Co-BF beamformer ~~APs~~ [CID#2988] shall ~~need to~~ initiate the sounding sequentially~~, i.e., total two sequences.~~ [CID#2989, remove to PHY] ~~For both UHR TB joint NDP sounding sequences, one AP conducts the frequency correction on its EHT sounding NDPs to a TBD range of the reference AP, which may be either AP1 or AP2.~~ [CID#3290] An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-4 (UHR [CID#920] Co-BF TBjoint NDP sounding sequence initiated from AP2)

Why Figure 37-4 for joint NDP sounding sequence follows the description for sequential sounding sequence? Should "[CID#3290] An example of a UHR [CID#920] Co-BF TB joint NDP sounding sequence initiated from AP2 is shown in Figure [CID#75] 37-4 (UHR [CID#920] Co-BF TBjoint NDP sounding sequence initiated from AP2)” after the paragraph above Figure 37-3.

[M#375] The term UHR Co-BF beamformer refers to a MU beamformer. The term UHR Co-BF beamformee refers to a MU beamformee. A UHR Co-BF beamformee only supports full bandwidth MU feedback.
I think UHR Co-BF beam former is more than a MU beam former, which can do cross BSS sounding.
I am not sure "A UHR Co-BF beamformee only supports full bandwidth MU feedback” is accurate. If MU beamformee supports both full bandwidth and partial bandwidth MU feedback, it still can be a UHR Co-BF beamformee.
I think it is better to use "A UHR Co-BF beamformee is only required to support full bandwidth MU feedback”.

Thanks
Yan

On Apr 18, 2025, at 12:22 PM, You-Wei Chen <ywchen77115@xxxxxxxxx> wrote:

Dear all,

I upload the PDT-CR document for sounding (681r0)
This was reviewed by the TTT and commenters.

Please review and let me know if you have further comments and suggestions, especially for the green and red highlighted parts. Many thanks.

Best Regards,
You-Wei Chen

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