Techniques for transmitting sidelink channel state information feedback
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a sidelink channel state information (CSI) reference signal (CSI-RS). The UE may transmit, based at least in part on the sidelink CSI-RS, a CSI report on a physical sidelink feedback channel. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving a sidelink channel state information (CSI) reference signal (CSI-RS); and
transmitting, based at least in part on the sidelink CSI-RS, a compact CSI report on a physical sidelink feedback channel (PSFCH),
wherein the compact CSI report is one or two bits in size and indicates that a non-compact CSI report is to be transmitted on another sidelink channel in a particular set of time-frequency resources.
2. The method of claim 1 , further comprising:
receiving a CSI report configuration in at least one of:
a radio resource control (RRC) communication from a network entity,
an RRC communication from another UE,
a physical sidelink broadcast channel communication, or
a physical sidelink control channel communication; and
wherein transmitting the compact CSI report comprises:
transmitting the compact CSI report based at least in part on the CSI report configuration.
3. The method of claim 2 , wherein the CSI report configuration indicates that the compact CSI report is to be transmitted.
4. The method of claim 3 , further comprising:
transmitting hybrid automatic repeat request feedback on the PSFCH with the compact CSI report.
5. The method of claim 1 ,
wherein the compact CSI report includes a channel quality indicator that is based at least in part on the sidelink CSI-RS.
6. The method of claim 1 , wherein the compact CSI report is in a sequence-based PSFCH format.
7. The method of claim 6 , wherein transmitting the compact CSI report comprises:
transmitting the compact CSI report in the sequence-based PSFCH format with repetition across a plurality of symbols.
8. The method of claim 1 ,
wherein the compact CSI report indicates CSI feedback that is differential to a previous compact CSI report.
9. The method of claim 1 ,
wherein the compact CSI report indicates CSI feedback that is differential to a previous non-compact CSI report.
10. The method of claim 9 , wherein a periodicity of the compact CSI report and a periodicity of the previous non-compact CSI report are different periodicities.
11. The method of claim 1 , wherein the compact CSI report is in a non-sequence-based PSFCH format.
12. The method of claim 1 , wherein the compact CSI report is in a non-sequence-based PSFCH format that includes:
a coded bit of CSI feedback, and
a coded bit of hybrid automatic repeat request feedback.
13. The method of claim 1 , wherein the compact CSI report is at least one of:
time division multiplexed on the PSFCH with one or more other CSI reports, or
frequency-division multiplexed on the PSFCH with one or more other CSI reports.
14. A method of wireless communication performed by a user equipment (UE), comprising:
transmitting a sidelink channel state information (CSI) reference signal (CSI-RS); and
receiving, based at least in part on the sidelink CSI-RS, a compact CSI report on a physical sidelink feedback channel (PSFCH),
wherein the compact CSI report is one or two bits in size and indicates that a non-compact CSI report is to be transmitted on another sidelink channel in a particular set of time-frequency resources.
15. The method of claim 14 , further comprising:
receiving hybrid automatic repeat request feedback on the PSFCH with the compact CSI report.
16. The method of claim 14 ,
wherein the compact CSI report includes a channel quality indicator that is based at least in part on the sidelink CSI-RS.
17. The method of claim 14 , wherein the compact CSI report is in a sequence-based PSFCH format.
18. The method of claim 17 , wherein receiving the compact CSI report comprises:
receiving the compact CSI report in the sequence-based PSFCH format with repetition across a plurality of symbols.
19. The method of claim 14 ,
wherein the compact CSI report indicates CSI feedback that is differential to a previous compact CSI report.
20. The method of claim 14 ,
wherein the compact CSI report indicates CSI feedback that is differential to a previous non-compact CSI report.
21. The method of claim 20 , wherein a periodicity of the compact CSI report and a periodicity of the previous non-compact CSI report are different periodicities.
22. The method of claim 14 , wherein the compact CSI report is in a non-sequence-based PSFCH format.
23. The method of claim 14 , wherein the compact CSI report is in a non-sequence-based PSFCH format that includes:
a coded bit of CSI feedback, and
a coded bit of hybrid automatic repeat request feedback.
24. The method of claim 14 , wherein the compact CSI report is at least one of:
time division multiplexed on the PSFCH with one or more other CSI reports, or
frequency-division multiplexed on the PSFCH with one or more other CSI reports.
25. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
receive a sidelink channel state information (CSI) reference signal (CSI-RS); and
transmit, based at least in part on the sidelink CSI-RS, a compact CSI report on a physical sidelink feedback channel (PSFCH),
wherein the compact CSI report is one or two bits in size and indicates that a non-compact CSI report is to be transmitted on another sidelink channel in a particular set of time-frequency resources.
26. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
transmit a sidelink channel state information (CSI) reference signal (CSI-RS); and
receive, based at least in part on the sidelink CSI-RS, a compact CSI report on a physical sidelink feedback channel (PSFCH),
wherein the compact CSI report is one or two bits in size and indicates that a non-compact CSI report is to be transmitted on another sidelink channel in a particular set of time-frequency resources.
27. The UE of claim 26 , wherein the one or more processors are further configured to:
receive hybrid automatic repeat request feedback on the PSFCH with the compact CSI report.
28. The UE of claim 25 , wherein the one or more processors are further configured to:
receive a CSI report configuration in at least one of:
a radio resource control (RRC) communication from a network entity,
an RRC communication from another UE,
a physical sidelink broadcast channel communication, or
a physical sidelink control channel communication; and
wherein the one or more processors, to transmit the compact CSI report, are configured to:
transmit the compact CSI report based at least in part on the CSI report configuration.
29. The UE of claim 25 , wherein the one or more processors, to transmit the compact CSI report, are configured to:
transmit the compact CSI report in a sequence-based PSFCH format with repetition across a plurality of symbols.
30. The UE of claim 26 , wherein the one or more processors, to receive the compact CSI report, are configured to:
receive the compact CSI report in a sequence-based PSFCH format with repetition across a plurality of symbols.