Hi Ming,
As I explained during the TGbe MAC call, the TWT element carries TWT Parameter set which contains fields whose values apply to the link for which the TWT is being setup. The parameter set includes the Target Wake Time field which provides timing information.
This timing information is absolute time (and is expressed in TSF). Therefore, unless the TSF on all the links is identical (i.e., offset is 0), the proposal in doc 552 (to allow more than one bit in the Link ID bitmap set to 1) will not work. TGbe group has
discussed TSF topic multiple times and has agreed that each AP of an AP MLD can have different TSFs.
If you are looking to setup overlapping individual TWTs, the existing spec (D1.5) allows you to do that by including more than one TWT element in the TWT setup frames. In this case, each TWT element carries a TWT parameter set with only one bit in the Link
ID bitmap is set to 1 and the value in the Target Wake Time subfield is with respect to the TSF of the link matching the bit set to 1 in the Link ID bitmap. Relevant text can be found in 35.8.2 (Individual TWT agreements)
Hope this helps!
Regards,
Abhi
From: Ganming(Ming Gan) <000017d5b1a95115-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, April 25, 2022 12:42 AM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] 22/552r2 Individual TWT
Hello all
This email is for the discussion of Individual TWT issue. If you have comments, please let me know.
Best wishes
Ming Gan
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