Hi,
Based on the feedback received during last call on this topic, we
simplified the previous SP to focus just on the basic timer usage scenarios. Please review and let me know if you have any comments.
Do you agree to add the following to 11be SFD R1: if during a transmission of a STA (STA-1) of a non-STR non-AP MLD, another STA (STA-2) of the same MLD cannot detect its medium state when required (due to STA-1’s UL transmission
interference), STA-2 shall start a MediumSyncDelay timer at the end of STA-1's transmission, unless the STA-2 ended a transmission at the same time:
- the MediumSyncDelay timer expires after a duration value that is either assigned by AP or a default value in spec or if at least either of the following events happens:
- any received PPDU with a valid MPDU
- a received PPDU with a valid TxOP_duration
whichever happens first.
- While the timer is running, STA-2 shall not initiate a TXOP except under TBD conditions.
Note: it is TBD whether STA-2 starts the MediumSyncDelay timer if the transmission of STA-1 is shorter than TBD duration
Regards,
Dibakar
From: Das, Dibakar <dibakar.das@xxxxxxxxx>
Sent: Tuesday, December 15, 2020 7:58 PM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] NSTR blindness issue
Hi all,
We worked offline and tried to converge on a SP text for blindness. The new version below captures the main aspects of both 1009r4 and 613r2. The highlighted text are the changes relative to r4. Please review and let us know of any comments.
Do you agree to add the following to 11be SFD R1: if during a transmission of a STA (STA-1) of a non-STR non-AP MLD
longer than a TBD duration, another STA (STA-2) of the same MLD cannot detect its medium state when required (due to STA-1’s UL transmission interference), STA-2 shall start a MediumSyncDelay timer
at the end of STA-1's transmission, unless the STA-2 ended a transmission at the same time:
- the MediumSyncDelay timer expires after a duration value that is either assigned by AP or specified in spec or if at least either of the following events happens:
- any received PPDU with a valid MPDU
- a received PPDU with a valid TxOP_duration
whichever happens first
- while the MediumSyncDelay timer is running the STA is only allowed to attempt to initiate up to number of TxOPs assigned by the AP (at least 1) and shall attempt to initiate that TxOP with the transmission
of an RTS frame using regular EDCA backoff using baseline CCA but a TBD ED threshold value
- The TBD ED threshold value has a default value specified in the spec (e.g., -62dBm) but can also be assigned by the AP MLD within a limited range such as between -82dBm and -62dBm
- If the channel was busy immediately after the blind period, additional TBD rules to use RTS may apply.
- If the PPDU transmitted by STA 1 carries a signal (Signaling is TBD) which indicates that STA 2 intends to send UL frame after transmission from
STA-1 then another AP (AP 2) of the same AP MLD should send a Trigger frame to STA-2 soliciting UL PPDU or a modified MU-RTS trigger that allocates time for STA-2 if the channel is idle, MediumSyncDelay timer is not 0 and if the AP2 does not have frame exchange
already scheduled with another STA
Note:
- If either the intra-BSS NAV or the inter-BSS NAV is non-zero in STA-2 at the end of transmission of STA-1, STA-2 does not transmit any PPDU using EDCA until the NAV expires.
- If either the intra-BSS NAV or the inter-BSS NAV is non-zero in STA-2 at the end of transmission of STA-1, there could be further TBD conditions and requirements to expire the MediumSyncDelay timer.
Regards,
Dibakar
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