Hello Abhi
Could you elaborate why the case you mentioned can’t work. For the TSF topic, it is right, we discussed it several times. Fortunately, the group reached consensus on it. Each affiliated
AP shall do synchronization on TSF, and can ensure the clock drift to be within +-30us. Moreover TSF offset is also provided. In this case, there is no issue to reference the TSF of any link .
Taking the following fig for example, an AP MLD and non-AP MLD setup two TWT agreements through one TWT element on link 1, the target wake up time is in reference to the TSF of link
1. If the target wake up time for link 1 is T, then target wake up time for link 1 is T-Delta, right? Here clock drift is ignored.
Best wishes
Ming Gan
发件人: Abhishek Patil [mailto:appatil@xxxxxxxxxxxxxxxx]
发送时间: 2022年4月26日
8:48
收件人: Ganming(Ming Gan) <ming.gan@xxxxxxxxxx>; STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: RE: [STDS-802-11-TGBE] 22/552r2 Individual TWT
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
To unsubscribe from the STDS-802-11-TGBE list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBE&A=1
To unsubscribe from the STDS-802-11-TGBE list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBE&A=1