Resource allocation for sidelink-assisted uplink transmission
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may select, on a sidelink of a user equipment (UE), a channel for sidelink-assisted feedback to be transmitted by the UE, wherein the sidelink-assisted feedback is associated with uplink control information (UCI) or aperiodic channel state information feedback; and transmit, to the UE, an indication of a resource allocation associated with the selected channel for the sidelink-assisted feedback. Numerous other aspects are provided.
1. A method of wireless communication performed by a remote user equipment (UE), comprising:
receiving, from a base station and via an access link between the remote UE and the base station, a communication that includes an indication of a resource allocation associated with a sidelink channel between the remote UE and a relay UE for transmitting feedback to the base station via the relay UE,
wherein the feedback is associated with the access link between the remote UE and the base station; and
transmitting, by the remote UE, the feedback on the resource allocation associated with the sidelink channel toward the base station via the relay UE, wherein the feedback indicates whether the remote UE successfully received the communication from the base station via the access link.
2. The method of claim 1 , wherein the sidelink channel is a physical sidelink shared channel, and wherein the method further comprises:
transmitting the feedback using medium access control signaling.
3. The method of claim 1 , wherein the method further comprises:
transmitting the feedback using sidelink control information.
4. The method of claim 3 , wherein the sidelink control information uses a format associated with carrying uplink control information (UCI) on the access link between the remote UE and the base station.
5. The method of claim 1 , wherein the sidelink channel is a physical sidelink feedback channel.
6. The method of claim 5 , wherein a physical sidelink feedback channel resource used to transmit the feedback is based at least in part on an uplink resource associated with a payload of the feedback.
7. The method of claim 6 , further comprising:
identifying the physical sidelink feedback channel resource based at least in part on at least:
a slot or subslot associated with the uplink resource,
a resource set associated with the uplink resource,
the uplink resource,
a physical uplink control channel format associated with the payload,
a timing parameter of the feedback or the payload,
a time gap or frequency resource of the physical sidelink feedback channel resource, or
a combination thereof.
8. The method of claim 7 , wherein identifying the physical sidelink feedback channel resource is based at least in part on a physical uplink control channel configuration associated with the payload.
9. The method of claim 1 , wherein the indication of the resource allocation is based at least in part on a resource associated with a physical downlink control channel, a control resource set, or a physical downlink shared channel, and a gap between the resource and the resource allocation.
10. The method of claim 9 , wherein the gap between the resource and the resource allocation is based at least in part on a minimum processing time of the relay UE.
11. The method of claim 1 , wherein the resource allocation is specific to the remote UE based at least in part on the remote UE being on the sidelink channel.
12. The method of claim 1 , wherein the communication comprises downlink control information (DCI).
13. The method of claim 12 , wherein the DCI is associated with selecting a link for the feedback.
14. The method of claim 12 , wherein the DCI indicates a time resource and a frequency resource for the feedback.
15. The method of claim 12 , wherein the DCI indicates a time resource for the feedback, and wherein a frequency resource for the feedback is indicated semi-statically.
16. The method of claim 12 , wherein the DCI indicates a time resource for the feedback, and wherein a frequency resource for the feedback is based at least in part on at least:
the time resource,
a slot associated with the DCI, or
a combination thereof.
17. The method of claim 12 , wherein the DCI indicates a frequency resource for the feedback and a time gap for determining a time resource for the feedback.
18. The method of claim 12 , wherein the DCI indicates a physical sidelink feedback channel resource and a physical sidelink feedback channel format for the feedback.
19. The method of claim 1 , wherein the resource allocation associated with the sidelink channel for the feedback is selected from a resource pool associated with feedback,
wherein the resource pool is included in a set of resource pools that are associated with transmitting feedback to the base station, and
wherein the indication of the resource allocation indicates the resource pool or a carrier for the resource allocation.
20. The method of claim 1 , wherein the resource allocation associated with the sidelink channel for the feedback is selected from a proper subset of a resource pool associated with transmitting feedback to the base station.
21. The method of claim 20 , wherein the indication of the resource allocation associated with the sidelink channel for the feedback indicates a resource, of the resource pool associated with transmitting feedback to the base station, for the feedback.
22. A method of wireless communication performed by a base station, comprising:
selecting, on a sidelink of a remote user equipment (UE), a sidelink channel between the remote UE and a relay UE for feedback to be transmitted by the remote UE to the base station via the relay UE,
wherein the feedback is associated with an access link between the remote UE and the base station;
transmitting, to the remote UE and via the access link between the remote UE and the base station, a communication that includes an indication of a resource allocation associated with the sidelink channel for transmitting the feedback to the base station via the relay UE; and
receiving, from the remote UE and via the relay UE, the feedback, wherein the feedback indicates whether the remote UE successfully received the communication from the base station via the access link.
23. The method of claim 22 , wherein the sidelink channel is a physical sidelink shared channel, and wherein receiving the feedback comprises:
receiving the feedback using medium access control signaling.
24. The method of claim 22 , wherein receiving the feedback comprises:
receiving the feedback using sidelink control information.
25. The method of claim 22 , wherein the indication of the resource allocation is based at least in part on a resource associated with a physical downlink control channel, a control resource set, or a physical downlink shared channel, and a gap between the resource and the resource allocation.
26. The method of claim 22 , wherein the resource allocation associated with the sidelink channel is selected from a resource pool associated with transmitting feedback to the base station via the relay UE,
wherein the resource pool is included in a set of resource pools that are associated with transmitting feedback to the base station via the relay UE, and
wherein the indication of the resource allocation indicates the resource pool or a carrier for the resource allocation.
27. A base station for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to:
select, on a sidelink of a remote user equipment (UE), a sidelink channel between the remote UE and a relay UE for transmitting feedback to the base station via the relay UE,
wherein the feedback is associated with an access link between the remote UE;
transmit, to the remote UE and via the access link between the remote UE and the base station, an indication of a resource allocation associated with the sidelink channel for transmitting the feedback to the base station via the relay UE; and
receive, from the remote UE and via the relay UE, the feedback, wherein the feedback indicates whether the remote UE successfully received the indication of the resource allocation from the base station via the access link.
28. The base station of claim 27 , wherein the sidelink channel is a physical sidelink shared channel, and
wherein the one or more processors, to receive the feedback, are configured to:
receive the feedback using medium access control signaling or sidelink control information.
29. A remote user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to:
receive, from a base station via an access link between the remote UE and the base station, a communication that includes an indication of a resource allocation associated with a sidelink channel between the remote UE and a relay UE for feedback to the base station via the relay UE,
wherein the feedback is associated with the access link between the remote UE and the base station; and
transmit, toward the base station and via the relay UE, the feedback on the resource allocation associated with the sidelink channel, wherein the feedback indicates whether the remote UE successfully received the communication from the base station via the access link.
30. The remote UE of claim 29 , wherein the sidelink channel is a physical sidelink feedback channel.