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Re: [STDS-802-11-TGBF] draft baseline PDT for "NDP format"

Hi Yan,

 

Thanks, I agree that NDP format is an important topic that we need to discuss in 11bf. In my opinion, fixing a single NDP format for sensing may not be optimal, for example HE NDP cannot cover all bandwidths (e.g., 320MHz) case, while EHT NDP may not be decodable by all 11bf STAs (e.g. pre-EHT STAs). One solution would be to dynamically choose the NDP format based on the responder’s capabilities.

 

Regards,

Rojan

 

From: Yan Xin <Yan.Xin@xxxxxxxxxx>
Sent: Friday, January 28, 2022 3:14 AM
To: Rojan Chitrakar <rojan.chitrakar@xxxxxxxxxxxxxxxx>; STDS-802-11-TGBF@xxxxxxxxxxxxxxxxx
Subject: RE: [STDS-802-11-TGBF] draft baseline PDT for "NDP format"

 

Hi Rojan:

 

Thanks for sharing your view. You are correct. Currently, the NDP format for sensing is TBD in SFD. TGbf needs to determine what type of NDP PPDU in 802.11 is to be selected for sensing. Then, we may follow the existing definitions on the parameters for the selected NDP PPDU for sensing.

 

Regards,

Yan.

 

From: Rojan Chitrakar [mailto:rojan.chitrakar@xxxxxxxxxxxxxxxx]
Sent: Tuesday, January 25, 2022 9:51 PM
To: Yan Xin <Yan.Xin@xxxxxxxxxx>; STDS-802-11-TGBF@xxxxxxxxxxxxxxxxx
Subject: RE: [STDS-802-11-TGBF] draft baseline PDT for "NDP format"

 

Hi Chris,

 

If I may add, regarding TXVECTOR parameters related to NDP transmissions, they are PHY specific and each PHY has defined methods to specify the NDP. E.g., for EHT PHY, the FORMAT has to be EHT_MU and PSDU_LENGTH = 0 signals an EHT Sounding NDP. HE/VHT have similar tables. In my opinion, what is unclear now in 11bf is how to specify the NDP format for each sequence, especially if 11bf defines a new Sensing NDPA.

 

 

Regards,

Rojan

 

-----Original Message-----
From: Yan Xin <0000181ed67b5ae9-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, January 26, 2022 3:03 AM
To: STDS-802-11-TGBF@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBF] draft baseline PDT for "NDP format"

 

Hi Chris:

 

Thanks for sharing the questions.

 

For the case of 11az, HE ranging NDP uses 2x HT-LTF with 8 us symbol duration, which is a specific case of HE-LTFs (with alternative parameters GIs, 1x / 2x/ 4x). For 11bf, I think we need to have further discussion on the parameters related to the NDP for sensing.

 

Thanks,

Yan.

 

-----Original Message-----

Sent: Friday, January 21, 2022 6:03 PM

Subject: Re: [STDS-802-11-TGBF] draft baseline PDT for "NDP format"

 

This is an interesting point, one which I wouldn’t mind discussing a bit further to understand the limitations. 

I agree that we already have multiple NDP types defined, and creating a new one is outside the scope.  But, what about defining TXVECTOR parameters for which are used to transmit the existing NDPs.  Is this something we have flexibility to define, and if so, where would we define it?

 

Thanks and regards,

-Chris

 

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