Uplink control channel resource selection for scheduling request transmission
Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support techniques for a user equipment (UE) to select a scheduling request resource from multiple scheduling request resources allocated across different cells based on one or more conditions. The UE may receive control signaling that indicates a first scheduling request resource on a first cell and a second scheduling request resource on a second cell. The UE may generate a scheduling request applicable to the first and second scheduling request resources. The UE may select the first scheduling request resource for transmission of the scheduling request on the first cell based on one or more of a power mode of the UE, a signal metric associated with the first cell, or a numerology of the first cell. The UE may transmit the scheduling request via the first resource on the first cell based on the selecting.
1. A user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and operable to execute the code to cause the UE to:
receive control signaling that indicates a first scheduling request resource on a first cell and a second scheduling request resource on a second cell;
generate a scheduling request at the UE, wherein both the first scheduling request resource on the first cell and the second scheduling request resource on the second cell are applicable to the scheduling request;
select the first scheduling request resource for transmission of the scheduling request on the first cell based at least in part on one or more of: a power mode of the UE, a signal metric associated with the first cell, or a numerology of the first cell; and
transmit the scheduling request via the first scheduling request resource on the first cell based at least in part on the selecting.
2. The UE of claim 1 , wherein the one or more processors are further operable to execute the code to cause the UE to:
operate in a reduced power mode, wherein selecting the first scheduling request resource is based at least in part on operating in the reduced power mode.
3. The UE of claim 2 , wherein, to select the first scheduling request resource, the one or more processors are operable to execute the code to cause the UE to:
select the first scheduling request resource based at least in part on a type of the first cell associated with the first scheduling request resource.
4. The UE of claim 3 , wherein:
the type of the first cell is a primary cell of a master or secondary cell group; and
selecting the first scheduling request resource is based at least in part on the type of the first cell being the primary cell of the master or secondary cell group.
5. The UE of claim 1 , wherein, to select the first scheduling request resource, the one or more processors are operable to execute the code to cause the UE to:
select the first scheduling request resource based at least in part on the signal metric associated with the first cell being greater than a second signal metric associated with the second cell.
6. The UE of claim 5 , wherein the one or more processors are further operable to execute the code to cause the UE to:
receive one or more reference signals via the first cell and the second cell; and
measure the signal metric associated with the first cell and the second signal metric associated with the second cell based at least in part on the one or more reference signals, wherein selecting the first scheduling request resource is based at least in part on the measuring.
7. The UE of claim 5 , wherein, to transmit the scheduling request, the one or more processors are operable to execute the code to cause the UE to:
transmit the scheduling request according to a first transmission power, the first transmission power based at least in part on a value of the signal metric.
8. The UE of claim 5 , wherein the signal metric and the second signal metric comprise reference signal received power metrics.
9. The UE of claim 1 , wherein, to select the first scheduling request resource, the one or more processors are operable to execute the code to cause the UE to:
select the first scheduling request resource based at least in part on the numerology of the first cell being greater than or equal to a numerology of the second cell.
10. The UE of claim 9 , wherein the numerology of the first cell and the numerology of the second cell are equal, and wherein the one or more processors are further operable to execute the code to cause the UE to:
select the first scheduling request resource based at least in part on a type of the first cell.
11. The UE of claim 1 , wherein the first scheduling request resource and the second scheduling request resource are at least partially overlapping in time.
12. The UE of claim 1 , wherein the first scheduling request resource and the second scheduling request resource are non-overlapping in time.
13. The UE of claim 1 , wherein:
the control signaling indicates a same scheduling request identifier for the first scheduling request resource and the second scheduling request resource;
generating the scheduling request is based at least in part on the same scheduling request identifier; and
the selecting is based at least in part on both the first scheduling request resource and the second scheduling request resource being associated with the same scheduling request identifier as the scheduling request.
14. A method for wireless communication at a user equipment (UE), comprising:
receiving control signaling that indicates a first scheduling request resource on a first cell and a second scheduling request resource on a second cell;
generating a scheduling request at the UE, wherein both the first scheduling request resource on the first cell and the second scheduling request resource on the second cell are applicable to the scheduling request;
selecting the first scheduling request resource for transmission of the scheduling request on the first cell based at least in part on one or more of: a power mode of the UE, a signal metric associated with the first cell, or a numerology of the first cell; and
transmitting the scheduling request via the first scheduling request resource on the first cell based at least in part on the selecting.
15. The method of claim 14 , further comprising:
operating in a reduced power mode, wherein selecting the first scheduling request resource is based at least in part on operating in the reduced power mode.
16. The method of claim 15 , wherein selecting the first scheduling request resource comprises:
selecting the first scheduling request resource based at least in part on a type of the first cell associated with the first scheduling request resource.
17. The method of claim 16 , wherein:
the type of the first cell is a primary cell of a master or secondary cell group; and
selecting the first scheduling request resource is based at least in part on the type of the first cell being the primary cell of the master or secondary cell group.
18. The method of claim 14 , wherein selecting the first scheduling request resource comprises:
selecting the first scheduling request resource based at least in part on the signal metric associated with the first cell being greater than a second signal metric associated with the second cell.
19. The method of claim 18 , further comprising:
receiving one or more reference signals via the first cell and the second cell; and
measuring the signal metric associated with the first cell and the second signal metric associated with the second cell based at least in part on the one or more reference signals, wherein selecting the first scheduling request resource is based at least in part on the measuring.
20. The method of claim 18 , wherein transmitting the scheduling request comprises:
transmitting the scheduling request according to a first transmission power, the first transmission power based at least in part on a value of the signal metric.
21. The method of claim 18 , wherein the signal metric and the second signal metric comprise reference signal received power metrics.
22. The method of claim 14 , wherein selecting the first scheduling request resource comprises:
selecting the first scheduling request resource based at least in part on the numerology of the first cell being greater than or equal to a numerology of the second cell.
23. The method of claim 22 , wherein the numerology of the first cell and the numerology of the second cell are equal, and wherein selecting the first scheduling request resource comprises:
selecting the first scheduling request resource based at least in part on a type of the first cell.
24. The method of claim 14 , wherein the first scheduling request resource and the second scheduling request resource are at least partially overlapping in time.
25. The method of claim 14 , wherein the first scheduling request resource and the second scheduling request resource are non-overlapping in time.
26. The method of claim 14 , wherein:
the control signaling indicates a same scheduling request identifier for the first scheduling request resource and the second scheduling request resource;
generating the scheduling request is based at least in part on the same scheduling request identifier; and
the selecting is based at least in part on both the first scheduling request resource and the second scheduling request resource being associated with the same scheduling request identifier as the scheduling request.
27. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving control signaling that indicates a first scheduling request resource on a first cell and a second scheduling request resource on a second cell;
means for generating a scheduling request at the UE, wherein both the first scheduling request resource on the first cell and the second scheduling request resource on the second cell are applicable to the scheduling request;
means for selecting the first scheduling request resource for transmission of the scheduling request on the first cell based at least in part on one or more of: a power mode of the UE, a signal metric associated with the first cell, or a numerology of the first cell; and
means for transmitting the scheduling request via the first scheduling request resource on the first cell based at least in part on the selecting.
28. The apparatus of claim 27 , further comprising:
means for operating in a reduced power mode, wherein selecting the first scheduling request resource is based at least in part on operating in the reduced power mode.
29. The apparatus of claim 28 , wherein the means for selecting the first scheduling request resource comprise:
means for selecting the first scheduling request resource based at least in part on a type of the first cell associated with the first scheduling request resource.
30. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by one or more processors to:
receive control signaling that indicates a first scheduling request resource on a first cell and a second scheduling request resource on a second cell;
generate a scheduling request at the UE, wherein both the first scheduling request resource on the first cell and the second scheduling request resource on the second cell are applicable to the scheduling request;
select the first scheduling request resource for transmission of the scheduling request on the first cell based at least in part on one or more of: a power mode of the UE, a signal metric associated with the first cell, or a numerology of the first cell; and
transmit the scheduling request via the first scheduling request resource on the first cell based at least in part on the selecting.