Feedback transmission using multiple access signatures

1. A method of wireless communication performed by a user equipment (UE), comprising:

receiving, by the UE and from another UE, a particular transmission on a particular transmission resource; and

transmitting, from the UE to the other UE, and on a feedback resource selected based at least in part on the particular transmission resource, a feedback message using a multiple access signature that enables many-to-one mapping of control-data resources to feedback resources, wherein the multiple access signature is determined based at least in part on a characteristic of the particular transmission.

2. The method of claim 1 , wherein the UE is configured to determine, for the feedback message, at least a cyclic shift, and wherein the multiple access signature is based on the cycle shift.

3. The method of claim 2 , wherein information identifying at least one of candidate sequence identifier, time-division orthogonal cover code, frequency-division orthogonal cover code, or cyclic shift is received via radio resource control signaling of a resource pool configuration message.

4. The method of claim 1 , wherein the feedback resource is a periodic feedback resource.

5. The method of claim 1 , wherein the particular transmission includes control information and payload data.

6. The method of claim 1 , wherein the feedback resource is determined based at least in part on a decode processing capability of the UE.

7. The method of claim 1 , wherein the multiple access signature is determined based at least in part on a slot in which the particular transmission ends and a feedback resource periodicity.

8. The method of claim 1 , wherein the multiple access signature is determined based at least in part on a resource pool configuration.

9. The method of claim 1 , wherein the multiple access signature is determined based at least in part on a priority of the particular transmission.

10. The method of claim 1 , wherein the multiple access signature is determined based at least in part on a quality of service parameter.

11. The method of claim 1 , wherein a reference signal sequence and a set of time-frequency resources for a reference signal associated with the feedback message are determined based at least in part on the multiple access signature.

12. The method of claim 1 , wherein a reference signal is used to demodulate feedback information of the feedback message.

13. The method of claim 1 , further comprising:

transmitting a reference signal for the feedback message using orthogonal resources concurrent with transmitting the feedback message using the multiple access signature.

14. The method of claim 1 , where the feedback message is a one-bit information message.

15. The method of claim 1 , where the feedback message is an acknowledgement message or a negative-acknowledgement message.

16. The method of claim 1 , where a set of possible multiple access sequences is a cyclically shifted version of a base sequence.

17. The method of claim 16 , wherein the UE is configured to use, for the cyclically shifted version of the base sequence, a cyclic shift determined based at least in part on a slot in which the particular transmission ends and a feedback resource periodicity.

18. A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the one or more processors configured to:

receive, by the UE and from another UE, a particular transmission on a particular transmission resource; and

transmit, from the UE to the other UE, and on a feedback resource selected based at least in part on the particular transmission resource, a feedback message using a multiple access signature that enables many-to-one mapping of control-data resources to feedback resources, wherein the multiple access signature is determined based at least in part on a characteristic of the particular transmission.

19. The UE of claim 18 , wherein the UE is configured to determine, for the feedback message, at least a cyclic shift, and wherein the multiple access signature is based on the cycle shift.

20. The UE of claim 19 , wherein information identifying at least one of candidate sequence identifier, time-division orthogonal cover code, frequency-division orthogonal cover code, or cyclic shift is received via radio resource control signaling of a resource pool configuration message.

21. The UE of claim 18 , wherein the feedback resource is a periodic feedback resource.

22. The UE of claim 18 , wherein the particular transmission includes control information and payload data.

23. The UE of claim 18 ,

wherein the multiple access signature is used to encode the feedback message and to identify the particular transmission, and

wherein the particular transmission includes a control-data transmission that triggers the feedback message.

24. The UE of claim 18 ,

wherein the particular transmission includes first control information,

wherein the particular transmission resource includes a slot in a channel,

wherein the first control information maps to the feedback resource in the channel, and

wherein second control information, transmitted in a different slot in the channel, maps to the feedback resource in the channel.

25. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:

receive, by the UE and from another UE, a particular transmission on a particular transmission resource; and

transmit, from the UE to the other UE, and on a feedback resource selected based at least in part on the particular transmission resource, a feedback message using a multiple access signature that enables many-to-one mapping of control-data resources to feedback resources, wherein the multiple access signature is determined based at least in part on a characteristic of the particular transmission.

26. The non-transitory computer-readable medium of claim 25 , wherein the UE is configured to determine, for the feedback message, at least a cyclic shift, and wherein the multiple access signature is based on the cycle shift.

27. The non-transitory computer-readable medium of claim 26 , wherein information identifying at least one of candidate sequence identifier, time-division orthogonal cover code, frequency-division orthogonal cover code, or cyclic shift is received via radio resource control signaling of a resource pool configuration message.

28. A user equipment (UE) for wireless communication, comprising:

means for receiving, by the UE and from another UE, a particular transmission on a particular transmission resource; and

means for transmitting, from the UE to the other UE, and on a feedback resource selected based at least in part on the particular transmission resource, a feedback message using a multiple access signature that enables many-to-one mapping of control-data resources to feedback resources, wherein the multiple access signature is determined based at least in part on a characteristic of the particular transmission.

29. The UE of claim 28 , wherein the UE is configured to determine, for the feedback message, at least a cyclic shift, and wherein the multiple access signature is based on the cycle shift.

30. The UE of claim 29 , wherein information identifying at least one of candidate sequence identifier, time-division orthogonal cover code, frequency-division orthogonal cover code, or cyclic shift is received via radio resource control signaling of a resource pool configuration message.