Hi, all
Let's consider the scenario shown in the image below.
When the STA and AP perform backoff on the BSS PC, if OBSS activity is detected, they switch to the NPCA PC. Then, the STA obtains TXOP and exchanges data with
the AP on the NPCA PC. After the date transmission is complete, the STA sends a frame with Power management subfield set to 1 to change its power mode. Upon receiving the ACK from the AP, the STA enters Doze state and can remain in Doze state after switching
back to the BSS PC.
In this case, if the STA is in Doze state when it switches back to the BSS PC, the STA will not resume
the backoff procedure that was in place before switching to the NPCA PC.
@Shubhodeep: I'm not sure if I've correctly remembered your question. In the case described above, the AP will resume
the backoff procedure, but the STA will not, because it is in Doze state.
@kaiying, please see the following description in the baseline
(P2173L51-Revmf1.2).
Based on this rule, the NPCA STA will resume backoff procedure when switching back to the BSS primarily channel even it have no data to transmit.
@Kiseon&Binita, I got your points, but the baseline didn’t take the NPCA operation which is a new
feature into account. In the baseline, if the STA successfully exchanges frames with its associated AP to change its power mode and then enters Doze state, it means the STA has accessed the channel and the backoff counter is zero.
However, the issue we are discussing is
whether the STA, when switching back to the BSS PC,
resumes the backoff procedure that was being performed on the BSS PC before switching to NPCA PC. This is a problem not encountered in the baseline. Therefore, we cannot simply refer to the baseline.
@Yongho,
for CID 4570, the comment is to add "if needed" at the end of this sentence. But in the baseline, A backoff procedure shall
be performed immediately after the end of every transmission even if no additional transmissions are currently queued. This means that even if there is no additional data to be transmitted, performing a backoff operation after each transmission is a mandatory
procedure. Therefore, I chose to reject this comment rather than revise it.
Please feel free to contact me if you have any comments.
BRs，
Yajun
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