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Re: [STDS-802-11-TGBE] PDT PHY: MU-MIMO

Hi Sameer,

Thanks for the contribution!

From the Spec text volunteers document, I see that the following motion (112 #SP47) is assigned to the MUMIMO section, but it appears to be missing in 1160r0 (probably an oversight):

PHY

MU MIMO

Sameer Vermani

 

Sameer Vermani, Bo Sun, Youhan Kim, Dandan Liang, Junghoon Suh, Aiguo Yan

Basics (R1)

20/1160r0, uploaded on August 25, 2020

Motion 65.

Motion 111, #SP0611-20

Motion 112, #SP15

Motion 112, #SP44

Motion 112, #SP47

The maximum number of users that can be spatially multiplexed in EHT for DL transmissions is 8 per RU/MRU.

·       Applicable to all transmission modes in 802.11be.

[Motion 112, #SP47, [9] and [141]]


I think this needs to be included as well.

Thanks!
-Srinath

On Tue, Aug 25, 2020 at 9:49 PM Sameer Vermani <svverman@xxxxxxxxxxxxxxxx> wrote:

Thanks Ross for the prompt review. I will correct the typos in the next version.

 

Masked LTF sequence was not used much in 11ax, and yes, it would be good to get rid of it, especially as the number of streams are going up-to 16. I remember the performance of that scheme degraded as the number of streams increased (the orthogonality assumption over frequency broke down more and more as number of masked tones increased, due to channel variation across frequency ). It does not make much sense for 11be.

 

Also, no pilot mode might be problematic with 16 LTFs as well. See slide 4 of 11-20/0382, where we showed issues without tracking in the 16 EHT-LTF case.  

 

So, yes performance analysis is saying that these two modes should not be allowed in 11be.

 

Regards,

Sameer

 

From: Yujian (Ross Yu) <ross.yujian@xxxxxxxxxx>
Sent: Tuesday, August 25, 2020 7:04 PM
To: Sameer Vermani <svverman@xxxxxxxxxxxxxxxx>; STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: 答复: PDT PHY: MU-MIMO

 

CAUTION: This email originated from outside of the organization.

Hi Sameer,

 

Thanks for the contribution. Some minor comments.

 

The subclause number is 27.3.3. Should be changed to 34.x.x

 

27.3.3.1.2         Maximum number of spatial streams in an HE MU PPDU

 

A non-AP STA that supports UL MU-MIMO shall support transmitting an HE TB PPDU using MU-MIMO where:

 

HE should be EHT.

 

Another clarification question, you mentioned:

Single stream pilot is the only EHT-LTF mode for the transmission of an EHT TB PPDU where MU-MIMO is employed on an RU, both when the MU-MIMO RU does or does not span the entire PPDU BW.

 

So your intention is to not support something similar as “HE masked HE-LTF sequence mode” for 11be? How about something like HE no pilot HE-LTF mode (1X HE-LTF without pilot)?

 

regards

于健 Ross Yu

Huawei Technologies

 

发件人: Sameer Vermani [mailto:svverman@xxxxxxxxxxxxxxxx]
发送时间: 2020年8月26日 9:40
收件人: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: [STDS-802-11-TGBE] PDT PHY: MU-MIMO

 

Dear MU-MIMO TTT members and all,

 

I have uploaded the initial draft for the PHY: MU-MIMO section to the server.

 

Link is below.

 

https://mentor.ieee.org/802.11/dcn/20/11-20-1160-00-00be-pdt-phy-mu-mimo.docx

 

Please let me know if you have any feedback. Thank you.

 

Regards,

Sameer

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