Hi Mark,
I have looked harder into this. Please see my comments in line
Graham
From: Mark Rison <m.rison@xxxxxxxxxxx>
Sent: Monday, December 5, 2022 5:08 PM
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGM] 11me/D2.0 CID 3502/3503 (Offset field in TDLS peer PSM)
--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---
CID 3503 says in relation to 1064.20:
"The Offset field is the time in microseconds between TSF 0 and the start of a first Awake Window.
See 11.2.3.12 (TDLS peer power save mode). " -- doesn't seem compatible with "Awake Windows begin at TSF values that satisfy the equation TSF mod Interval = Offset." at 2390.60
GS –I think the ‘formula’ is misleading, but actually correct and compatible. The “Offset” clearly is only appropriate for the “first Awake Window”. Subsequent Awake windows then occur, spaced at
“Interval”.
The formula is simply saying that the regular Awake Windows are spaced at Interval, and the remainder is the Offset (i.e., the Offset is not equal to the Interval, or a multiple of it).
Hence, the two are compatible but the formula, although correct, is maybe a horrible way of describing it. I would suggest the formula is deleted and maybe something along the lines of
“After the first Awake window, subsequent
Awake Windows begin at TSF values that are separated by Interval time.”
and CID 3502 says:
"The Offset field is the time in microseconds between TSF 0 and the start of a first Awake Window.
See 11.2.3.12 (TDLS peer power save mode). " -- but the TSF is 8 octets and the Offset field is only 4 octets
and suggests:
Change the first cited text to "The Offset field is the time in microseconds between intervals specified by the Interval field, starting at TSF 0, and the start
of the Awake Window, in microseconds."
GS – I don’t like this. I do not think that Offset and Interval are related at all. Maybe the confusion is on TSF 0? What exactly is that? It seems to be a TSF value at time zero. So I don’t think
it starts at the beginning of the TSF field, but at the end of it?
I personally would leave this alone.
Please speak up if you have any questions or comments.
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
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