Feedback Resource

1 . A method comprising:

receiving, by a source wireless device from a base station, configuration parameters of physical sidelink feedback channel (PSFCH) radio resources;

transmitting, to a destination wireless device, sidelink control information comprising an identity (ID) of the source wireless device; and

receiving, from the destination wireless device, an acknowledgement for a transport block via a PSFCH radio resource having an index that is based on:

the ID of the source wireless device;

an ID of the destination wireless device; and

a modulo operation performed on a quantity of the PSFCH radio resources.

2 . The method of claim 1 , further comprising receiving one or more radio resource control (RRC) messages comprising the configuration parameters of the PSFCH radio resources.

3 . The method of claim 1 , wherein the configuration parameters of the PSFCH radio resources indicate the quantity of the PSFCH radio resources.

4 . The method of claim 1 , wherein the configuration parameters indicate one or more resource pools of the PSFCH radio resources.

5 . The method of claim 4 , wherein the index of the PSFCH radio resource is further based on the one or more resource pools of the PSFCH radio resources.

6 . The method of claim 4 , wherein each of the one or more resource pools comprises one or both of:

a contiguous resource block in a frequency domain; or

a noncontiguous resource block in the frequency domain.

7 . The method of claim 1 , wherein the ID of the destination wireless device comprises one of:

a cell radio network temporary identifier;

an international mobile subscriber ID;

a zone identification of the destination wireless device; or

a temporary mobile subscriber ID.

8 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a source wireless device, cause the source wireless device to:

receive, from a base station, configuration parameters of physical sidelink feedback channel (PSFCH) radio resources;

transmit, to a destination wireless device, sidelink control information comprising an identity (ID) of the source wireless device; and

receive, from the destination wireless device, an acknowledgement for a transport block via a PSFCH radio resource having an index that is based on:

the ID of the source wireless device;

an ID of the destination wireless device; and

a modulo operation performed on a quantity of the PSFCH radio resources.

9 . The non-transitory computer-readable medium of claim 8 , wherein the instructions further cause the source wireless device to receive one or more radio resource control (RRC) messages comprising the configuration parameters of the PSFCH radio resources.

10 . The non-transitory computer-readable medium of claim 8 , wherein the configuration parameters of the PSFCH radio resources indicate the quantity of the PSFCH radio resources.

11 . The non-transitory computer-readable medium of claim 8 , wherein the configuration parameters indicate one or more resource pools of the PSFCH radio resources.

12 . The non-transitory computer-readable medium of claim 11 , wherein the index of the PSFCH radio resource is further based on the one or more resource pools of the PSFCH radio resources.

13 . The non-transitory computer-readable medium of claim 8 , wherein the ID of the destination wireless device comprises one of:

a cell radio network temporary identifier;

an international mobile subscriber ID;

a zone identification of the destination wireless device; or

a temporary mobile subscriber ID.

14 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a destination wireless device, cause the destination wireless device to:

receive, from a base station, configuration parameters of physical sidelink feedback channel (PSFCH) radio resources;

receive, from a source wireless device, sidelink control information comprising an identity (ID) of the source wireless device; and

transmit, to the source wireless device, an acknowledgement for a transport block via a PSFCH radio resource having an index that is based on:

the ID of the source wireless device;

an ID of the destination wireless device; and

a modulo operation performed on a quantity of the PSFCH radio resources.

15 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the destination wireless device to receive one or more radio resource control (RRC) messages comprising the configuration parameters of the PSFCH radio resources.

16 . The non-transitory computer-readable medium of claim 14 , wherein the configuration parameters of the PSFCH radio resources indicate the quantity of the PSFCH radio resources.

17 . The non-transitory computer-readable medium of claim 14 , wherein the configuration parameters indicate one or more resource pools of the PSFCH radio resources.

18 . The non-transitory computer-readable medium of claim 17 , wherein the index of the PSFCH radio resource is further based on the one or more resource pools of the PSFCH radio resources.

19 . The non-transitory computer-readable medium of claim 17 , wherein each of the one or more resource pools comprises one or both of:

a contiguous resource block in a frequency domain; or

a noncontiguous resource block in the frequency domain.

20 . The non-transitory computer-readable medium of claim 14 , wherein the ID of the destination wireless device comprises one of:

a cell radio network temporary identifier;

an international mobile subscriber ID;

a zone identification of the destination wireless device; and

a temporary mobile subscriber ID.