Timeline considerations for channel state information reporting of a sidelink channel

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

receiving, from a second UE on a first sidelink channel, a first timing configuration, wherein the first UE and the second UE are different UEs;

receiving, from the second UE on the first sidelink channel, a first control information comprising a trigger to measure an aperiodic reference signal based at least in part on the first timing configuration, wherein the first control information is relayed from the second UE to the first UE based at least in part on the first UE being out of coverage with respect to a network device;

receiving, from the second UE, the aperiodic reference signal on a second sidelink channel based at least in part on the received first control information; and

transmitting, to the second UE on a third sidelink channel, a channel state information report (CSI) prior to a termination of the first timing configuration.

2. The method of claim 1 , wherein the first control information triggers the transmission of the CSI report to the second UE from a plurality of UEs.

3. The method of claim 1 , wherein the first control information and the aperiodic reference signal are in a same slot, or the first control information is in a first slot that occurs prior to a second slot comprising the aperiodic reference signal.

4. The method of claim 1 , wherein the first sidelink channel comprises a physical sidelink shared channel (PSSCH), the second sidelink channel comprises the PSSCH or a physical uplink shared channel (PUSCH), and the third sidelink channel comprises the PSSCH or a physical sidelink feedback channel (PSFCH).

5. The method of claim 1 , wherein the first timing configuration defines a time period for the second UE to transmit, to a network device, aggregated CSI reports with respect to when the second UE receives the CSI report.

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

transmitting, to a network device, a capability report comprising UE timing capabilities;

receiving, from the network device, a first timing configuration;

receiving, from the network device, a first downlink control information (DCI) comprising a trigger to measure an aperiodic reference signal based at least in part on the first timing configuration;

receiving, from a second UE, the aperiodic reference signal on a first sidelink channel based at least in part on the received first DCI, wherein the first UE and the second UE are different UEs; and

transmitting, to the second UE on a second sidelink channel, a channel state information (CSI) report prior to a termination of the first timing configuration, wherein the first timing configuration defines a time period for the second UE to transmit, to the network device, aggregated CSI reports with respect to when the second UE receives the CSI report, and wherein receiving the first DCI from the network device and transmitting the CSI report to the second UE is based at least in part on the first UE being in a partial coverage status with respect to the network device.

7. The method of claim 6 , wherein the first DCI and the aperiodic reference signal are in a same slot, or the first DCI is in a first slot that occurs prior to a second slot comprising the aperiodic reference signal.

8. The method of claim 6 , wherein the first sidelink channel comprises a physical sidelink shared channel (PSSCH), and the second sidelink channel comprises the PSSCH or a physical sidelink feedback channel (PSFCH).

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

transmitting, to a network device, a capability report comprising timing capabilities of the first UE;

receiving, from a network device, a first timing configuration, the timing configuration indicating a duration that is based at least in part on the timing capabilities of the first UE;

receiving, from the network device, a first downlink control information (DCI) comprising a trigger of an aperiodic reference signal based at least in part on a first timing configuration;

transmitting, to at least a second UE, the aperiodic reference signal on a sidelink channel based at least in part on the trigger received in the first DCI;

receiving, from at least the second UE, one or more channel state information (CSI) reports comprising CSI parameters derived based at least in part on measurements of the aperiodic reference signal;

aggregating the one or more CSI reports during the first timing configuration; and

transmitting, to the network device, the aggregated CSI reports on an uplink channel prior to a termination of the first timing configuration.

10. The method of claim 9 , further comprising:

transmitting, to the network device, a capability report comprising UE timing capabilities; and

refraining from transmitting the aggregated CSI reports when the first timing configuration is shorter than the reported UE timing capabilities.

11. The method of claim 10 , wherein the refraining further comprises:

transmitting, to the network device, false aggregated CSI reports on the uplink channel prior to the termination of the first timing configuration when the first timing configuration is shorter than the reported UE timing capabilities; or dropping the aggregated CSI reports when the first timing configuration is shorter than the reported UE timing capabilities.

12. The method of claim 10 , wherein the first timing configuration is based at least in part on a capability of the first UE and a capability of the second UE.

13. The method of claim 9 , further comprising:

receiving the one or more CSI reports within a reception time window based at least in part on the received first DCI.

14. The method of claim 13 , wherein the aggregating further comprises:

aggregating the one or more CSI reports received within the reception time window;

dropping one or more CSI reports received after the termination of the reception time window; or

transmitting, to the network device, false aggregated CSI reports on the uplink channel prior to the termination of the first timing configuration for the one or more CSI reports received after the termination of the reception time window.

15. The method of claim 9 , wherein the first timing configuration defines a time period for the first UE to transmit the aggregated CSI reports with respect to when the first UE receives the one or more CSI reports.

16. The method of claim 9 , wherein the first timing configuration defines a time period for the first UE to transmit the aggregated CSI reports with respect to when the first UE receives the first DCI.

17. The method of claim 9 , wherein the first DCI and the aperiodic reference signal are in a same slot, or the first DCI is in a first slot that occurs prior to a second slot comprising the aperiodic reference signal.

18. The method of claim 9 , wherein the sidelink channel comprises a physical sidelink shared channel (PSSCH), and the uplink channel comprises the PSSCH, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a physical sidelink feedback channel (PSFCH).

19. The method of claim 9 , further comprising:

receiving, from the network device, an indication to transmit a second DCI based at least in part on a coverage status of the second UE; and

transmitting, to the second UE on the sidelink channel, the second DCI comprising a trigger to measure the aperiodic reference signal, wherein the second DCI is transmitted based at least in part on the received indication.

20. The method of claim 19 , wherein the second UE is located out of coverage of the network device.

21. A method for wireless communications at a network device, comprising:

receiving, from a first user equipment (UE), a capability report comprising timing capabilities for the first UE and timing capabilities for at least a second UE;

transmitting, to the first UE, a first downlink control information (DCI) comprising a first timing configuration and a trigger of an aperiodic reference signal, the first timing configuration indicating a duration that is based at least in part on the timing capabilities for the first UE and the timing capabilities for the second UE; and

receiving, from the first UE, an aggregated channel state information (CSI) report of a sidelink channel between the first UE and at least a second UE, the aggregated CSI report received prior to a termination of the first timing configuration.

22. The method of claim 21 , further comprising:

determining the first timing configuration based at least in part on a capability of the first UE and a capability of at least the second UE, wherein the aggregated CSI report comprises one or more false CSI reports when the first timing configuration is shorter than the reported UE timing capabilities.

23. The method of claim 21 , further comprising:

transmitting, to the second UE, a second DCI comprising the first timing configuration and a trigger to measure the aperiodic reference signal.

24. The method of claim 23 , wherein the first DCI is the same as the second DCI.

25. The method of claim 23 , wherein the first DCI is different from the second DCI.

26. The method of claim 23 , wherein the second DCI and the aperiodic reference signal are in a same slot, or the second DCI is in a first slot that occurs prior to a second slot comprising the aperiodic reference signal.

27. The method of claim 21 , further comprising:

transmitting, to the first UE, an indication to transmit a second DCI to the second UE based at least in part on the second UE being out of coverage from the network device.

28. The method of claim 21 , wherein the first timing configuration defines a time period for the first UE to transmit the aggregated CSI reports with respect to when the first UE receives the one or more CSI reports.

29. The method of claim 21 , wherein the first timing configuration defines a time period for the first UE to transmit the aggregated CSI reports with respect to when the first UE receives the first DCI.