Re: [STDS-802-11-TGBE] SP for 21/0095

[Sigurd Schelstraete <sschelstraete@xxxxxxxxxxxxx>]

Hi all,

I noted the following items during today’s discussion

1. Comments to reword “shall have already received” because this was somewhat confusing
2. Questions as to whether this is R1 or R2 and some disagreements about whether SST is exclusively R2 or already partially defined in R1
3. Whether the SP is for SFD or not (i.e. for information)
4. Comment that similar issue needs to be addressed for non-HT duplicate (e.g. Trigger frame)

 

On item 1, I’ve tried some improved wording with the same intent below.

 

On item 2, I think it’s fair to say we don’t know if and to what extent SST will be defined in R1. Clearly, different people have different opinions. To the extent that SST operation in non-primary 80 MHz is part of R1, this agreement applies to R1. If operation in non-primary 80 MHz is deferred to R2, it only applies to R2. Since we don’t fully know where we stand on this, the wording should be either agnostic to R1/R2 or be conditional. I’ve tried to capture this below.

 

On item 3, the intention is to run the SP as a Motion later if the proposal has sufficient support. I’d propose we eliminate this part of the discussion for the SP and remove mention of the SFD until we get to the motion. That looks like the better place to put it.

 

On item 4, I suggested during the call to draft a separate SP on this to avoid adding yet another moving part to the SP text. Once we have acceptable SP text for EHT MU PPDU, it shouldn’t be too hard to get a similar SP for non-HT duplicate.

 

 

So, with that, here’s the updated proposal (most relevant changes highlighted):

 

• Do you agree that:
• for an 80 MHz operating STA supporting SST that is assigned (by the AP) a non-primary 80 MHz channel in a 160 MHz or 320 MHz EHT MU PPDU using SST, the STA shall have prior knowledge of at least one "guaranteed non-punctured 20 MHz channel" from the AP within the non-primary 80 MHz.
• Notes:
• This agreement might apply to R1 insofar as operation in non-primary 80 MHz is defined in R1
• SST in non-primary 160 MHz is an agreed R2 feature
• ways of informing the STA (signaling, static information, …) are TBD

 

(SP for 160 MHz operating STA will look similar)

 

Regards,

 

Sigurd

 

 

From: Sigurd Schelstraete
Sent: Thursday, January 21, 2021 10:56 AM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: SP for 21/0095

 

Hi all,

During the last joint TGbe call, the wording of SP1 in 21/0095r0 was modified during discussion, but the SP itself was not run pending further discussion.

 

The latest draft wording is:

• Do you agree that:
• for an 80 MHz operating STA supporting SST that is assigned (by the AP) a non-primary 80 MHz channel in a 160 MHz or 320 MHz EHT MU PPDU using SST, the STA shall have already received at least one "guaranteed non-punctured 20 MHz channel" from the AP within the non-primary 80 MHz.
• Note: SST in non-primary 80 MHz is an agreed R2 feature

 

Some motivation behind the current wording:

• The main motivation is to keep preamble processing similar in primary 80 MHz and non-primary 80 MHz by having a guaranteed non-punctured 20 MHz channel in both
• We’re not trying to get into any details of the SST mechanism (or other signaling)
• The SP tries to cover cases where puncturing may be static (not part of SST) vs. more dynamic

 

I believe the current wording is fine for the limited scope of the agreement we’re looking for (sufficient to guarantee that preamble processing in non-primary 80 is not different). Definitely further agreements would be needed as to how the indication of the "guaranteed non-punctured 20 MHz channel" is done in practice, … but I’d rather break this down into separate agreements.

 

With that in mind, are there any remaining concerns with the wording as shown above?

 

Thanks,

 

Sigurd

 

 

 

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