Timeline for sidelink inter-user equipment coordination
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may select a set of available sidelink resources in a selection window for communication by a second UE. The first UE may transmit, to the second UE, an inter-UE coordination message that indicates inter-UE coordination information identifying the set of available sidelink resources, wherein the selection window is of a length different than a length of a resource selection window of the first UE. Numerous other aspects are provided.
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:
select a set of sidelink resources in a selection window in which the first UE selects resources for inter-UE coordination operations,
wherein the set of sidelink resources is selected by the first UE for communication by a second UE, and
wherein the selection window is for multiple UEs that include at least the second UE and a third UE;
receive a request for resources from the second UE and a request for resources from the third UE;
transmit, to the second UE, an inter-UE coordination message that indicates inter-UE coordination information identifying the set of sidelink resources, wherein the one or more processors are configured to transmit the inter-UE coordination message after a minimum time gap from reception of the request for resources from the second UE and the request for resources from the third UE; and
transmit reporting to the third UE after the minimum time gap.
2. The apparatus of claim 1 , wherein the set of sidelink resources is a set of available sidelink resources.
3. The apparatus of claim 1 , wherein the set of sidelink resources is a set of unavailable sidelink resources.
4. The apparatus of claim 1 , wherein the selection window is selected or determined independent of a resource selection window of the first UE.
5. The apparatus of claim 1 , wherein a length of the selection window is a fixed length.
6. The apparatus of claim 5 , wherein the fixed length is equal to a maximum time duration for reserving sidelink resources.
7. The apparatus of claim 1 , wherein a length of the selection window is associated with a resource pool of the set of sidelink resources.
8. The apparatus of claim 1 , wherein a length of the selection window is associated with a carrier associated with the set of sidelink resources.
9. The apparatus of claim 1 , wherein the selection window is configured using semi-static signaling.
10. The apparatus of claim 1 , wherein the selection window is based at least in part on at least one of:
a cast type of traffic associated with the selection window,
a packet delay budget of the traffic, or
a priority of the traffic.
11. The apparatus of claim 1 ,
wherein the request for resources from the second UE or the request for resources from the third UE indicates a length of the selection window or a time associated with the selection window.
12. The apparatus of claim 11 , wherein the length of the selection window is based at least in part on whether the request is received via the second UE, a base station, or a relay associated with a base station.
13. The apparatus of claim 1 , wherein the selection window is defined based at least in part on a time gap from the inter-UE coordination message.
14. The apparatus of claim 1 , wherein the one or more processors are further configured to:
transmit the inter-UE coordination message after the minimum time gap from an end of a channel carrying the request for resources from the second UE and the request for resources from the third UE.
15. The apparatus of claim 14 , wherein the minimum time gap is based at least in part on receiving the request via a base station or the second UE.
16. The apparatus of claim 1 , wherein the one or more processors are further configured to:
determine that the set of sidelink resources is to be selected, wherein one or more processors are configured to transmit the inter-UE coordination message after the minimum time gap is based at least in part on a time associated with the determination that the set of sidelink resources are to be selected.
17. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the inter-UE coordination message in a first available resource after the minimum time gap.
18. 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:
transmit, to a second UE, a request for resources; and
receive, from the second UE, an inter-UE coordination message that indicates inter-UE coordination information identifying a set of sidelink resources, in a selection window in which the second UE selects resources for inter-UE coordination operations, for communication by the first UE,
wherein the selection window is for multiple UEs that include at least the first UE and a third UE,
wherein the one or more processors are configured to receive the inter-UE coordination message after a minimum time gap from transmitting the request for resources, and
wherein transmission of reporting to the third UE occurs after the minimum time gap; and
perform a communication on a sidelink resource of the set of sidelink resources based at least in part on a determination of a location of the selection window.
19. The apparatus of claim 18 ,
wherein the request for resources indicates a length of the selection window or the location of the selection window.
20. The apparatus of claim 18 ,
wherein the inter-UE coordination message is received after the minimum time gap from an end of a channel carrying the request for resources.
21. A method of wireless communication performed by a first user equipment (UE), comprising:
selecting a set of sidelink resources in a selection window in which the first UE selects resources for inter-UE coordination operations,
wherein the set of sidelink resources is selected by the first UE for communication by a second UE, and
wherein the selection window is for multiple UEs that include at least the second UE and a third UE;
receiving a request for resources from the second UE and a request for resources from the third UE;
transmitting, to the second UE, an inter-UE coordination message that indicates inter-UE coordination information identifying the set of sidelink resources, wherein the inter-UE coordination message is transmitted after a minimum time gap from receiving the request for resources from the second UE and the request for resources from the third UE; and
transmitting reporting to the third UE after the minimum time gap.
22. The method of claim 21 , wherein the set of sidelink resources is a set of available sidelink resources.
23. The method of claim 21 , wherein the set of sidelink resources is a set of unavailable sidelink resources.
24. The method of claim 21 , wherein the selection window is selected or determined independent of a resource selection window of the first UE.
25. The method of claim 21 , wherein a length of the selection window is a fixed length.
26. The method of claim 25 , wherein the fixed length is equal to a maximum time duration for reserving sidelink resources.
27. The method of claim 21 , wherein a length of the selection window is associated with a resource pool of the set of sidelink resources.
28. The method of claim 21 , wherein a length of the selection window is associated with a carrier associated with the set of sidelink resources.
29. The method of claim 21 , wherein the selection window is configured using semi-static signaling.
30. A method of wireless communication performed by a first user equipment (UE), comprising:
transmitting, to a second UE, a request for resources; and
receiving, from the second UE, an inter-UE coordination message that indicates inter-UE coordination information identifying a set of sidelink resources, in a selection window in which the second UE selects resources for inter-UE coordination operations, for communication by the first UE,
wherein the selection window is for multiple UEs that include at least the first UE and a third UE,
wherein the inter-UE coordination message is received after a minimum time gap from transmitting the request for resources, and
wherein transmission of reporting to the third UE occurs after the minimum time gap; and
performing a communication on a sidelink resource of the set of sidelink resources based at least in part on a determination of a location of the selection window.