Concurrent physical sidelink feedback channel transmission
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify multiple candidate sets of physical sidelink feedback channel (PSFCH) transmissions that include hybrid automatic repeat request (HARQ) feedback for sidelink communications received from one or more peer UEs. The UE may select, from one or more of the multiple candidate sets that satisfy a PSFCH transmit power constraint, at least one candidate set that has a highest value for a utility parameter among utility parameters associated with each of the one or more candidate sets that satisfy a PSFCH transmit power constraint. The UE may transmit, on a PSFCH, the plurality of PSFCH transmissions included in the at least one candidate set in a HARQ feedback occasion. Numerous other aspects are provided.
1. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
identify one or more candidate sets of physical sidelink feedback channel (PSFCH) transmissions that each include a quantity of PSFCH transmissions, wherein the PSFCH transmissions are to provide hybrid automatic repeat request (HARQ) feedback for a plurality of sidelink communications received from one or more other UEs, and wherein the quantity of PSFCH transmissions included in each of the one or more candidate sets are identified in accordance with a concurrent transmission capability of the UE;
identify, based at least in part on link budget requirements for each PSFCH transmission of the quantity of the PSFCH transmissions, one or more numbers of the PSFCH transmissions, of the quantity of the PSFCH transmissions, included in each candidate set, wherein the one or more numbers of the PSFCH transmissions are identified in accordance with a transmit power constraint;
select at least one candidate set that includes the one or more numbers of the PSFCH transmissions from the one or more candidate sets based at least in part on a priority associated with each PSFCH transmission of the quantity of the PSFCH transmissions in the at least one candidate set; and
transmit the at least one candidate set in a HARQ feedback occasion.
2. The UE of claim 1 , wherein the one or more numbers are identified further based at least in part on one or more rules.
3. The UE of claim 2 , wherein the one or more rules assign priorities to the HARQ feedback for the plurality of sidelink communications.
4. The UE of claim 1 , wherein the transmit power constraint is a power backoff.
5. The UE of claim 1 , wherein the transmit power constraint is based at least in part on a maximum power reduction (MPR) value.
6. The UE of claim 1 , wherein the one or more numbers is more than one number for the PSFCH transmissions.
7. The UE of claim 1 , wherein a highest number of the one or more numbers is equal to or less than a maximum quantity of concurrent PSFCH transmissions.
8. The UE of claim 1 , wherein the at least one candidate set includes the one or more of the PSFCH transmissions.
9. The UE of claim 1 , wherein the one or more of the PSFCH transmissions include multiple PSFCH transmissions.
10. A method of wireless communication performed by a user equipment (UE), comprising:
identifying one or more candidate sets of physical sidelink feedback channel (PSFCH) transmissions that each include a quantity of PSFCH transmissions, wherein the PSFCH transmissions are to provide hybrid automatic repeat request (HARQ) feedback for a plurality of sidelink communications received from one or more other UEs, and wherein the quantity of PSFCH transmissions included in each of the one or more candidate sets are identified in accordance with a concurrent transmission capability of the UE;
identifying, based at least in part on link budget requirements for each PSFCH transmission of the quantity of the PSFCH transmissions, one or more numbers of the PSFCH transmissions, of the quantity of the PSFCH transmissions included in each candidate set, wherein the one or more numbers of the PSFCH transmissions are identified in accordance with a transmit power constraint;
selecting at least one candidate set that includes the one or more numbers of the PSFCH transmissions from the one or more candidate sets based at least in part on a priority associated with each PSFCH transmission of the quantity of the PSFCH transmissions in the at least one candidate set; and
transmitting the at least one candidate set in a HARQ feedback occasion.
11. The method of claim 10 , wherein the one or more numbers are identified further based at least in part on one or more rules.
12. The method of claim 11 , wherein the one or more rules assign priorities to the HARQ feedback for the plurality of sidelink communications.
13. The method of claim 10 , wherein the transmit power constraint is a power backoff.
14. The method of claim 10 , wherein the transmit power constraint is based at least in part on a maximum power reduction (MPR) value.
15. The method of claim 10 , wherein the one or more numbers is more than one number for the PSFCH transmissions.
16. The method of claim 10 , wherein a highest number of the one or more numbers is equal to or less than a maximum quantity of concurrent PSFCH transmissions.
17. The method of claim 10 , wherein the at least one candidate set includes the one or more of the PSFCH transmissions.
18. The method of claim 10 , wherein the one or more of the PSFCH transmissions include multiple PSFCH transmissions.
19. 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 user equipment (UE), cause the UE to:
identify one or more candidate sets of physical sidelink feedback channel (PSFCH) transmissions that each include a quantity of PSFCH transmissions, wherein the PSFCH transmissions are to provide hybrid automatic repeat request (HARQ) feedback for a plurality of sidelink communications received from one or more other UEs, and wherein the quantity of PSFCH transmissions included in each of the one or more candidate sets are identified in accordance with a concurrent transmission capability of the UE;
identify, based at least in part on link budget requirements for each PSFCH transmission of the quantity of the PSFCH transmissions, one or more numbers of the PSFCH transmissions, of the quantity of the PSFCH transmissions included in each candidate set, wherein the one or more numbers of the PSFCH transmissions are identified in accordance with a transmit power constraint;
select at least one candidate set that includes the one or more numbers of the PSFCH transmissions from the one or more candidate sets based at least in part on a priority associated with each PSFCH transmission of the quantity of the PSFCH transmissions in the at least one candidate set; and
transmit the at least one candidate set in a HARQ feedback occasion.
20. The non-transitory computer-readable medium of claim 19 , wherein the one or more numbers are identified further based at least in part on one or more rules.
21. The non-transitory computer-readable medium of claim 20 , wherein the one or more rules assign priorities to the HARQ feedback for the plurality of sidelink communications.
22. The non-transitory computer-readable medium of claim 19 , wherein the transmit power constraint is a power backoff.
23. The non-transitory computer-readable medium of claim 19 , wherein the transmit power constraint is based at least in part on a maximum power reduction (MPR) value.
24. The non-transitory computer-readable medium of claim 19 , wherein the one or more numbers is more than one number for the PSFCH transmissions.
25. The non-transitory computer-readable medium of claim 19 , wherein the at least one candidate set includes the one or more of the PSFCH transmissions.
26. An apparatus for wireless communication, comprising:
means for identifying one or more candidate sets of physical sidelink feedback channel (PSFCH) transmissions that each include a quantity of PSFCH transmissions, wherein the PSFCH transmissions are to provide hybrid automatic repeat request (HARQ) feedback for a plurality of sidelink communications received from one or more other apparatuses, and wherein the quantity of PSFCH transmissions included in each of the one or more candidate sets are identified in accordance with a concurrent transmission capability of the apparatus;
means for identifying, based at least in part on link budget requirements for each PSFCH transmission of the quantity of the PSFCH transmissions, one or more numbers of the PSFCH transmissions, of the quantity of the PSFCH transmissions included in each candidate set, wherein the one or more numbers of the PSFCH transmissions are identified in accordance with a transmit power constraint;
means for selecting at least one candidate set that includes the one or more numbers of the PSFCH transmissions from the one or more candidate sets based at least in part on a priority associated with each PSFCH transmission of the quantity of the PSFCH transmissions in the at least one candidate set; and
means for transmitting the at least one candidate set in a HARQ feedback occasion.
27. The apparatus of claim 26 , wherein the one or more numbers is more than one number for the PSFCH transmissions.
28. The apparatus of claim 26 , wherein the transmit power constraint is a power backoff based at least in part on one or more of a maximum power reduction (MPR) value or a maximum transmit power capability of the apparatus.
29. The apparatus of claim 26 , wherein the concurrent transmission capability corresponds to a parameter configured by a network entity, and wherein the parameter is based at least in part on congestion corresponding to a sidelink channel in the HARQ feedback occasion.
30. The apparatus of claim 26 , wherein the transmit power constraint includes one or more power sharing rules to be applied to the PSFCH transmissions, and wherein the one or more power sharing rules include allocating total available transmit power to the PSFCH transmissions based on priorities associated with the PSFCH transmissions.