Uplink transmissions based on sidelink grants

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

at least one processor; and

memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor to cause the apparatus to:

receive an uplink grant indicating uplink resources on which to transmit uplink signaling;

receive a sidelink grant indicating sidelink resources on which to transmit sidelink signaling;

transmit, in a subset of the sidelink resources, uplink control information comprising a plurality of parameters associated with an uplink message; and

transmit the uplink message via the sidelink resources based at least in part on the uplink control information.

2. The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

receive control signaling indicating a priority threshold value associated with a preemption of sidelink resources for uplink communications, wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message are based at least in part on a first priority level associated with the uplink message.

3. The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

compare the first priority level with a second priority level associated with a pending sidelink message, wherein the priority threshold value comprises a priority difference threshold value associated with the first priority level and the second priority level, and wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message via the sidelink resources are based at least in part on a difference between the first priority level and the second priority level satisfying the priority threshold value.

4. The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

determine that the first priority level satisfies the priority threshold value, wherein the priority threshold value is associated with the first priority level, and wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message via the sidelink resources are based at least in part on the first priority level satisfying the priority threshold value.

5. The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

receive control signaling indicating a second priority threshold value associated with retransmission of a sidelink message; and

determine that a retransmission message associated with the sidelink resources fails to satisfy the second priority threshold value or that the sidelink message associated with the sidelink resources is not a retransmission message, wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message via the sidelink resources are based at least in part on the determining.

6. The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

receive control signaling indicating a subset of the sidelink resources that are available for transmission of the uplink message; and

select the subset of sidelink resources from the sidelink resources, wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message comprises instructions executable by the at least one processor to cause the apparatus to transmit the uplink message via the subset of sidelink resources.

7. The apparatus of claim 1 , wherein the plurality of parameters comprises a modulation and coding scheme, a demodulation reference signal, a hybrid automatic request process number, a time domain resource allocation associated with the sidelink resources, a frequency resource allocation associated with the sidelink resources, a number of layers, a pre-coder, a new data indicator, a redundancy version identifier, or any combination thereof.

8. The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

receive control signaling indicating one or more of the plurality of parameters, wherein the instructions executable by the at least one processor to cause the apparatus to transmit the uplink control information are based at least in part on control signaling indicating the one or more of the plurality of parameters.

9. The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

receive an indication of the subset of the sidelink resources.

10. The apparatus of claim 1 , wherein the subset of sidelink resources is associated with a fixed position within the sidelink resources.

11. The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

drop a pending sidelink message based at least in part on the instructions executable by the at least one processor to cause the apparatus to transmit the uplink message via the sidelink resources; and

transmit a feedback message indicating that the UE used the sidelink resources for transmitting the uplink message.

12. The apparatus of claim 11 , wherein the feedback message comprises a negative acknowledgement message or an indication that the pending sidelink message has been dropped.

13. An apparatus for wireless communications at a network entity, comprising:

at least one processor; and

memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor to cause the apparatus to:

output an uplink grant for a user equipment (UE) indicating uplink resources on which the UE is to transmit uplink signaling;

output a sidelink grant for the UE indicating sidelink resources on which the UE is to transmit sidelink signaling;

obtain, in a subset of the sidelink resources, uplink control information comprising a plurality of parameters associated with an uplink message; and

obtain the uplink message via the sidelink resources based at least in part on the uplink control information.

14. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

output control signaling indicating a priority threshold value associated with a preemption of sidelink resources for uplink communications, wherein the instructions executable by the at least one processor to cause the apparatus to obtain the uplink message are based at least in part on a first priority level associated with the uplink message.

15. The apparatus of claim 14 , wherein the priority threshold value comprises a priority difference threshold value associated with the first priority level and a second priority level associated with a pending sidelink signaling.

16. The apparatus of claim 14 , wherein the priority threshold value is associated with the first priority level.

17. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

output control signaling indicating a subset of the sidelink resources that are available for transmission of the uplink message; and

monitor the subset of the sidelink resources for the uplink message, wherein the instructions executable by the at least one processor to cause the apparatus to obtain the uplink message via the sidelink resources are based at least in part on the monitoring.

18. The apparatus of claim 17 , wherein the subset of the sidelink resources comprises a subset of one or more monitoring occasions for obtaining uplink signaling via the sidelink resources.

19. The apparatus of claim 17 , wherein the subset of the sidelink resources partially overlaps with one or more monitoring occasions for obtaining uplink signaling via the sidelink resources.

20. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

output control signaling indicating a third priority level associated with retransmission of a sidelink message.

21. The apparatus of claim 13 , wherein the plurality of parameters comprises a modulation and coding scheme, a demodulation reference signal, a hybrid automatic request process number, a time domain resource allocation associated with the sidelink resources, a frequency resource allocation associated with the sidelink resources, a number of layers, a pre-coder, a new data indicator, a redundancy version identifier, or any combination thereof.

22. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

output control signaling indicating one or more of the plurality of parameters, wherein the instructions executable by the at least one processor to cause the apparatus to obtain the uplink control information are based at least in part on the control signaling indicating the one or more of the plurality of parameters.

23. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

output control signaling indicating the subset of the sidelink resources, wherein the instructions executable by the at least one processor to cause the apparatus to obtain the uplink control information are based at least in part on outputting the control signaling indicating the subset of the sidelink resources.

24. The apparatus of claim 13 , wherein the subset of sidelink resources is associated with a fixed position within the sidelink resources.

25. The apparatus of claim 13 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

obtain a feedback message indicating that the UE used the sidelink resources for transmitting the uplink message.

26. The apparatus of claim 25 , wherein the feedback message comprises a negative acknowledgement message or an indication that a sidelink message has been dropped by the UE.

27. A method for wireless communications at a user equipment (UE), comprising:

receiving an uplink grant indicating uplink resources on which to transmit uplink signaling;

receiving a sidelink grant indicating sidelink resources on which to transmit sidelink signaling;

transmitting, in a subset of the sidelink resources, uplink control information comprising a plurality of parameters associated with an uplink message; and

transmitting the uplink message via the sidelink resources based at least in part on the uplink control information.

28. A method for wireless communications at a network entity, comprising:

outputting an uplink grant for a user equipment (UE) indicating uplink resources on which the UE is to transmit uplink signaling;

outputting a sidelink grant for the UE indicating sidelink resources on which the UE is to transmit sidelink signaling;

obtaining, in a subset of the sidelink resources, uplink control information comprising a plurality of parameters associated with an uplink message; and

obtaining the uplink message via the sidelink resources based at least in part on the uplink control information.