TECHNIQUES FOR LISTEN BEFORE TALK FAILURE RECOVERY FOR SIDELINK
Various aspects of the present disclosure relate to techniques for listen before talk failure recovery for sidelink. An apparatus includes at least one memory and at least one processor coupled with the at least one memory. The at least one processor is configured to cause the apparatus to detect a consistent LBT failure on a set of resource blocks RBs, perform at least one LBT on the set of RBs, wherein the LBT is performed based on a reference sidelink SL format, increment a counter in response to determining a success for one of the at least one LBT, wherein the counter is associated with the set of RBs, and, in response to determining that the counter satisfies a predefined threshold, cancel the consistent LBT failure.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
detect a consistent listen before talk (LBT) failure on a set of resource blocks (RBs);
perform at least one LBT on the set of RBs, wherein the LBT is performed based on a reference sidelink (SL) format;
increment a counter in response to determining a success for one of the at least one LBT, wherein the counter is associated with the set of RBs; and
in response to determining that the counter satisfies a predefined threshold, cancel the consistent LBT failure.
2 . The UE of claim 1 , wherein:
the reference SL format is comprised of a predefined channel access priority class.
3 . The UE of claim 1 , wherein:
the LBT based on a reference SL format is comprised of a fixed sensing duration.
4 . The UE of claim 1 , wherein:
the at least one LBT that is performed on the set of RBs based on the reference SL format is performed during a time window.
5 . The UE of claim 4 , wherein:
the time window begins a predefined time offset after having declared consistent LBT failure for the set of RBs.
6 . The UE of claim 5 , wherein:
the at least one LBT is performed at predefined occasions during the time window.
7 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
detect a consistent listen before talk (LBT) failure on a set of resource blocks (RBs);
perform at least one LBT on the set of RBs, wherein the LBT is performed based on a reference sidelink (SL) format;
increment a counter in response to determining a success for one of the at least one LBT, wherein the counter is associated with the set of RBs; and
in response to determining that the counter satisfies a predefined threshold, cancel the consistent LBT failure.
8 . The processor of claim 7 , wherein:
the reference SL format is comprised of a predefined channel access priority class.
9 . The processor of claim 7 , wherein:
the LBT based on a reference SL format is comprised of a fixed sensing duration.
10 . The processor of claim 7 , wherein:
the at least one LBT that is performed on the set of RBs based on the reference SL format is performed during a time window.
11 . The processor of claim 10 , wherein:
the time window begins a predefined time offset after having declared consistent LBT failure for the set of RBs.
12 . The processor of claim 11 , wherein:
the at least one LBT is performed at predefined occasions during the time window.
13 . A method performed by a user equipment (UE), the method comprising:
detecting a consistent listen before talk (LBT) failure on a set of resource blocks (RBs);
performing at least one LBT on the set of RBs, wherein the LBT is performed based on a reference sidelink (SL) format;
incrementing a counter in response to determining a success for one of the at least one LBT, wherein the counter is associated with the set of RBs; and
in response to determining that the counter satisfies a predefined threshold, cancelling the consistent LBT failure.
14 . The method of claim 13 , wherein:
the reference SL format is comprised of a predefined channel access priority class.
15 . The method of claim 13 , wherein:
the LBT based on a reference SL format is comprised of a fixed sensing duration.
16 . The method of claim 13 , wherein:
the at least one LBT that is performed on the set of RBs based on the reference SL format is performed during a time window.
17 . The method of claim 16 , wherein:
the time window begins a predefined time offset after having declared consistent LBT failure for the set of RBs.
18 . The method of claim 17 , wherein:
the at least one LBT is performed at predefined occasions during the time window.
19 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
detect a consistent listen before talk (LBT) failure on a set of resource blocks (RBs);
notify at least one peer UE associated with the set of RBs for which consistent LBT is detected of the consistent LBT failure; and
in response to the consistent LBT failure being cancelled, notify the at least one peer UE associated with the set of RBs for which consistent LBT is detected that the consistent LBT failure is cancelled.
20 . The UE of claim 19 , wherein:
the at least one processor is configured to cause the UE to notify the at least one peer UE of the consistent LBT failure as part of transmission of inter-UE coordination (IUC) information.