Coordination signaling for sidelink resource selection

1. An apparatus for wireless communication at a first user equipment (UE), comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to:

receive, using a first sidelink resource, a request for inter-UE coordination; and

transmit, using a second sidelink resource, an inter-UE coordination report to a second UE via a sidelink interface, the second sidelink resource selected by the first UE based at least in part on a mapping between the first sidelink resource and the second sidelink resource.

2. The apparatus of claim 1 , wherein the one or more processors are configured to:

select the second sidelink resource from dedicated resources for inter-UE coordination signaling in a sidelink resource pool.

3. The apparatus of claim 2 , wherein the dedicated resources are configured or preconfigured per sidelink resource pool, per carrier, or per bandwidth part.

4. The apparatus of claim 1 , wherein the one or more processors are configured to:

select the second sidelink resource from resources in a sidelink resource pool dedicated for inter-UE coordination signaling.

5. The apparatus of claim 1 , wherein the second sidelink resource is associated with one or more resource blocks or sub-channels.

6. The apparatus of claim 1 , wherein the first sidelink resource is included in a plurality of sidelink resources available for inter-UE coordination signaling, and wherein the plurality of sidelink resources are configured with a defined periodicity.

7. The apparatus of claim 6 , wherein the plurality of sidelink resources available for the inter-UE coordination signaling are configured in a single sidelink slot or distributed across a plurality of sidelink slots.

8. The apparatus of claim 6 , wherein the plurality of sidelink resources available for the inter-UE coordination signaling are configured in a frequency domain and in a time domain.

9. The apparatus of claim 6 , wherein the one or more processors are further configured to:

transmit signaling to a plurality of UEs including the second UE indicating that the plurality of sidelink resources are not available for data transmissions.

10. The apparatus of claim 1 , wherein the one or more processors are further configured to:

receive a sidelink resource configuration that defines a set of sidelink resources,

wherein the one or more processors are configured to:

select the second sidelink resource based at least in part on the sidelink resource configuration.

11. The apparatus of claim 10 , wherein the one or more processors, to receive the sidelink resource configuration, are configured to:

receive the sidelink resource configuration from a network entity or another UE.

12. The apparatus of claim 1 , wherein the one or more processors are configured to:

select the second sidelink resource based at least in part on a sidelink resource allocation in which the first UE senses the second sidelink resource as available and reserves the second sidelink resource.

13. The apparatus of claim 12 , wherein the one or more processors are configured to:

sense the second sidelink resource as available from a sidelink resource pool dedicated for inter-UE coordination signaling; or

reserve the second sidelink resource from the sidelink resource pool dedicated for inter-UE coordination signaling.

14. The apparatus of claim 1 , wherein the inter-UE coordination report is transmitted based at least in part on the request for inter-UE coordination.

15. The apparatus of claim 1 , wherein the one or more processors are further configured to:

map the first sidelink resource to the second sidelink resource.

16. The apparatus of claim 1 , wherein the one or more processors are further configured to:

map a sub-channel associated with the first sidelink resource to a set of sidelink resources useable for inter-UE coordination signaling.

17. The apparatus of claim 1 , wherein the first sidelink resource and the second sidelink resource are included in a same defined period.

18. The apparatus of claim 1 , wherein the first sidelink resource is included in a first plurality of sidelink resources and the second sidelink resource is included in a second plurality of sidelink resources, and wherein the second plurality of sidelink resources is a multiple of the first plurality of sidelink resources.

19. The apparatus of claim 1 , wherein the one or more processors are further configured to:

map the first sidelink resource to the second sidelink resource based at least in part on an index assigned to the first sidelink resource.

20. The apparatus of claim 1 , wherein the one or more processors are further configured to:

map the first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources are available for transmitting the inter-UE coordination report.

21. The apparatus of claim 1 , wherein the one or more processors are further configured to:

determine the second sidelink resource based at least in part on mapping a starting sub-channel associated with the first sidelink resource to the second sidelink resource.

22. The apparatus of claim 21 , wherein the one or more processors are further configured to:

determine additional sidelink resources for inter-UE coordination signaling based at least in part on a fixed offset from the second sidelink resource.

23. A method of wireless communication performed by a first user equipment (UE), comprising:

receiving, using a first sidelink resource, a request for inter-UE coordination; and

transmitting, using a second sidelink resource, an inter-UE coordination report to a second UE via a sidelink interface, the second sidelink resource selected by the first UE based at least in part on a mapping between the first sidelink resource and the second sidelink resource.

24. The method of claim 23 , further comprising:

mapping the first sidelink resource to the second sidelink resource.

25. The method of claim 23 , further comprising:

mapping the first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources are available for transmitting the inter-UE coordination report.

26. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:

one or more instructions that, when executed by one or more processors of a first user equipment (UE), cause the first UE to:

receive, using a first sidelink resource, a request for inter-UE coordination; and

transmit, using a second sidelink resource, an inter-UE coordination report to a second UE via a sidelink interface, the second sidelink resource selected by the first UE based at least in part on a mapping between the first sidelink resource and the second sidelink resource.

27. The non-transitory computer-readable medium of claim 26 , wherein the one or more processors are further configured to:

map the first sidelink resource to the second sidelink resource.

28. The non-transitory computer-readable medium of claim 26 , wherein the one or more processors are further configured to:

map the first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources are available for transmitting the inter-UE coordination report.

29. An apparatus for wireless communication, comprising:

means for receiving, using a first sidelink resource, a request for inter-user equipment (UE) coordination; and

means for transmitting, using a second sidelink resource, an inter-UE coordination report to a UE via a sidelink interface, the second sidelink resource selected by the apparatus based at least in part on a mapping between the first sidelink resource and the second sidelink resource.

30. The apparatus of claim 29 , further comprising:

means for mapping the first sidelink resource to the second sidelink resource.