Channel occupancy time (COT) sharing for sidelink

1. A method of wireless communication, comprising:

determining, by a first user equipment (UE), a channel occupancy time (COT) in a shared radio frequency band for communicating a sidelink communication with a second UE, wherein the determining is based on a listen-before-talk (LBT) procedure associated with a channel access priority class (CAPC); and

transmitting, by the first UE to the second UE, the sidelink communication using first resources comprising a first frequency interlace in the COT, the sidelink communication comprising at least sidelink control information (SCI), wherein:

the SCI comprises COT sharing information for second resources in the COT and information indicating the CAPC;

the second resources comprise a plurality of frequency interlaces including a second frequency interlace different from the first frequency interlace; and

the COT sharing information comprises an indicator indicating the plurality of frequency interlaces including the second frequency interlace are available to the second UE for sharing the COT.

2. The method of claim 1 , wherein the shared radio frequency band comprises the plurality of frequency interlaces of resource blocks (RBs).

3. The method of claim 2 , wherein the COT sharing information indicates the second resources comprising a second frequency interlace of the plurality of frequency interlaces are available during the COT.

4. The method of claim 3 , wherein:

the COT sharing information indicates a gap period in the COT for performing a listen-before-talk (LBT) procedure prior to using the second frequency interlace during the COT; and

the method further comprises:

refraining, by the first UE, from transmitting in the shared radio frequency band during the gap period; and

transmitting, by the first UE to a third UE, another sidelink communication using a third frequency interlace of the plurality of frequency interlaces during the COT after the gap period.

5. The method of claim 1 , wherein the determining is based on a listen-before-talk (LBT) procedure associated with a channel access priority class (CAPC), and wherein the COT sharing information indicates the CAPC.

6. The method of claim 1 , wherein the COT sharing information comprises timing information associated with at least one of a duration of the COT or a duration of the second resources.

7. The method of claim 6 , wherein the COT sharing information further comprises:

timing information associated with a set of contention slots in the duration of the second resources; or

at least one of a starting time of an earliest contention slot of the set of contention slots, or a duration of a first contention slot of the set of contention slots.

8. A method of wireless communication, comprising:

monitoring, by a first user equipment (UE), for sidelink channel occupancy time (COT) sharing information in a shared radio frequency band;

receiving, by the first UE from a second UE using first resources comprising a first frequency interlace, sidelink control information (SCI) comprising the sidelink COT sharing information associated with a COT based on the monitoring and further comprising information indicating a channel access priority class (CAPC);

selecting, by the first UE, a second frequency interlace from one or more frequency interlaces;

transmitting, by the first UE to a third UE different from the second UE, a sidelink communication in the shared radio frequency band using second resources comprising the second frequency interlace during the COT based on the COT sharing information, wherein:

the second resources comprises the one or more frequency interlaces different from the first frequency interlace;

the COT sharing information comprises an indicator indicating the one or more frequency interlaces are available to the second UE for sharing the COT; and

the COT is determined based on a listen-before-talk (LBT) procedure associated with the CAPC.

9. The method of claim 8 , wherein the sidelink COT sharing information indicates the one or more frequency interlaces of resource blocks (RBs) in the shared radio frequency band are available during the COT.

10. The method of claim 8 , further comprising:

selecting, by the first UE, the second frequency interlace from the one or more frequency interlaces.

11. The method of claim 8 , wherein:

the sidelink COT sharing information indicates a gap period within the COT;

the method further comprises:

performing, by the first UE during the gap period, a listen-before-talk (LBT) procedure in the shared radio frequency band; and

the transmitting the sidelink communication is based on the LBT procedure being successful.

12. The method of claim 8 , wherein:

the sidelink COT sharing information comprises at least one of information associated with a channel access priority class (CAPC) or timing information associated with a sharing duration in the COT; and

the transmitting is based on the at least one of the CAPC or the sharing duration.

13. The method of claim 8 , wherein:

the sidelink COT sharing information comprises timing information associated with contention slots in a sharing duration within the COT;

the method further comprises:

performing, by the first UE based on the timing information associated with the contention slots, a listen-before-talk (LBT) procedure in the shared radio frequency band; and

the transmitting is based on the LBT procedure being successful.

14. The method of claim 8 , wherein the COT is a COT of the second UE or a COT of a fourth UE different from the second UE.

15. The method of claim 8 , wherein the transmitting the sidelink communication comprises:

transmitting, by the first UE, second SCI comprising at least some of the sidelink COT sharing information received from the second UE to propagate the sidelink COT sharing information.

16. A first user equipment (UE) comprising:

a processor configured to determine a channel occupancy time (COT) in a shared radio frequency band for communicating a sidelink communication with a second UE, wherein the determining is based on a listen-before-talk (LBT) procedure associated with a channel access priority class (CAPC); and

a transceiver configured to transmit, to the second UE, the sidelink communication using first resources comprising a first frequency interlace in the COT, the sidelink communication comprising at least sidelink control information (SCI), wherein:

the SCI comprises COT sharing information for second resources in the COT and information indicating the CAPC;

the second resources comprise a plurality of frequency interlaces including a second frequency interlace different from the first frequency interlace; and

the COT sharing information comprises an indicator indicating the plurality of frequency interlaces including the second frequency interlace are available to the second UE for sharing the COT.

17. The first UE of claim 16 , wherein the shared radio frequency band comprises the plurality of frequency interlaces of resource blocks (RBs).

18. The first UE of claim 17 , wherein the COT sharing information indicates the second resources comprising a second frequency interlace of the plurality of frequency interlaces are available during the COT.

19. The first UE of claim 18 , wherein:

the COT sharing information indicates a gap period in the COT for performing a listen-before-talk (LBT) procedure prior to using the second frequency interlace during the COT;

the processor is further configured to:

refrain, from transmitting in the shared radio frequency band during the gap period; and

the transceiver is further configured to:

transmit, to a third UE, another sidelink communication using a third frequency interlace of the plurality of frequency interlaces during the COT after the gap period.

20. The first UE of claim 16 , wherein the processor configured to determine the COT is further configured to:

determine the COT based on a listen-before-talk (LBT) procedure associated with a channel access priority class (CAPC), and wherein the COT sharing information indicates the CAPC.

21. The first UE of claim 16 , wherein the COT sharing information comprises timing information associated with at least one of a duration of the second resources, a set of contention slots in the duration of the second resources, a starting time of an earliest contention slot of the set of contention slots, or a duration of a first contention slot of the set of contention slots.

22. A first user equipment (UE) comprising:

a processor configured to monitor for sidelink channel occupancy time (COT) sharing information in a shared radio frequency band; and

a transceiver configured to:

receive, from a second UE using first resources comprising a first frequency interlace, sidelink control information (SCI) comprising the sidelink COT sharing information associated with a COT based on the monitoring and further comprising information indicating a channel access priority class (CAPC); and

select, by the first UE, a second frequency interlace from one or more frequency interlaces;

transmit, to a third UE different from the second UE, a sidelink communication in the shared radio frequency band using second resources comprising the second frequency interlace during the COT based on the COT sharing information, wherein:

the second resources comprise one or more frequency interlaces different from the first frequency interlace, and

the COT sharing information comprises an indicator indicating the one or more frequency interlaces are available to the second UE for sharing the COT; and

the COT is determined based on a listen-before-talk (LBT) procedure associated with the CAPC.

23. The first UE of claim 22 , wherein the sidelink COT sharing information indicates the one or more frequency interlaces of resource blocks (RBs) in the shared radio frequency band are available during the COT.

24. The first UE of claim 22 , wherein the processor is further configured to:

select the second frequency interlace from the one or more frequency interlaces.

25. The first UE of claim 22 , wherein:

the sidelink COT sharing information indicates a gap period within the COT;

the processor is further configured to:

perform, during the gap period, a listen-before-talk (LBT) procedure in the shared radio frequency band; and

the transceiver configured to transmit the sidelink communication is configured to:

transmit the sidelink communication based on the LBT procedure being successful.

26. The first UE of claim 22 , wherein:

the sidelink COT sharing information comprises at least one of information associated with a channel access priority class (CAPC) or timing information associated with a sharing duration in the COT; and

the transceiver configured to transmit the sidelink communication is configured to:

transmit the sidelink communication based on the at least one of the CAPC or the sharing duration.

27. The first UE of claim 22 , wherein:

the sidelink COT sharing information comprises timing information associated with contention slots in a sharing duration within the COT;

the processor is further configured to:

perform, based on the timing information associated with the contention slots, a listen-before-talk (LBT) procedure in the shared radio frequency band; and

the transceiver configured to transmit the sidelink communication is configured to:

transmit the sidelink communication based on the LBT procedure being successful.

28. The first UE of claim 22 , wherein the COT is a COT of the second UE or a fourth UE different from the second UE.