CSI report including information identifying CSI-RS
A method, a computer-readable medium, and an apparatus for wireless communication at a first user equipment (UE). A channel state information (CSI) report trigger can be received from a second UE, and a channel state information reference signal (CSI-RS) can be received from the second UE in a same slot as the CSI report trigger. A CSI report can be transmitted to the second UE based on the CSI-RS, the CSI report including information identifying the CSI-RS on which the CSI report is based. The UE that triggered the CSI report can determine the CSI-RS on which the CSI report is based using the information included in the CSI report.
1. A method of wireless communication at a first user equipment (UE), comprising:
receiving a channel state information (CSI) report trigger from a second UE;
receiving a channel state information reference signal (CSI-RS) from the second UE in a same slot as the CSI report trigger; and
transmitting a CSI report to the second UE based on the CSI-RS, the CSI report comprising information identifying the CSI-RS on which the CSI report is based, wherein the information identifying the CSI-RS includes at least one of:
a system frame number or a direct frame number of a frame within which the CSI-RS is received;
a slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
an indication of an absolute time at which the CSI-RS is received;
a Hybrid Automatic Repeat Request (HARQ) process identifier for a slot or a shared channel within which the CSI-RS is received; or
a combination thereof.
2. The method of claim 1 , wherein the information identifying the CSI-RS includes the system frame number or the direct frame number of the frame within which the CSI-RS is received.
3. The method of claim 2 , wherein the information identifying the CSI-RS further includes the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received.
4. The method of claim 1 , wherein the information identifying the CSI-RS includes the indication of the absolute time at which the CSI-RS is received.
5. The method of claim 1 , wherein the information identifying the CSI-RS includes the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
6. The method of claim 1 , wherein the information identifying the CSI-RS includes at least two of:
the system frame number of the frame within which the CSI-RS is received;
the direct frame number of the frame within which the CSI-RS is received;
the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
the indication of the absolute time at which the CSI-RS is received; or
the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
7. The method of claim 1 , wherein the first UE transmits the CSI report in a medium access control-control element (MAC-CE).
8. The method of claim 7 , wherein the first UE transmits the MAC-CE comprising the CSI report on a sidelink shared channel having associated sidelink control information indicating a source and a destination.
9. The method of claim 1 , wherein the first UE receives the CSI report trigger in sidelink control information from the second UE.
10. A method of wireless communication at a first user equipment (UE), comprising:
transmitting a channel state information (CSI) report trigger to a second UE;
transmitting a channel state information reference signal (CSI-RS) to the second UE in a same slot as the CSI report trigger;
receiving a CSI report from the second UE based on the CSI-RS, the CSI report comprising information identifying the CSI-RS on which the CSI report is based, wherein the information identifying the CSI-RS includes at least one of:
a system frame number or a direct frame number of a frame within which the CSI-RS is received;
a slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
an indication of an absolute time at which the CSI-RS is received;
a Hybrid Automatic Repeat Request (HARQ) process identifier for a slot or a shared channel within which the CSI-RS is received; or
a combination thereof; and
determining the CSI-RS on which the CSI report is based using the information comprised in the CSI report.
11. The method of claim 10 , wherein the information identifying the CSI-RS includes the system frame number or the direct frame number of the frame within which the CSI-RS is received.
12. The method of claim 11 , wherein the information identifying the CSI-RS further includes the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received.
13. The method of claim 10 , wherein the information identifying the CSI-RS includes the indication of the absolute time at which the CSI-RS is received.
14. The method of claim 10 , wherein the information identifying the CSI-RS includes the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
15. The method of claim 10 , wherein the information identifying the CSI-RS includes at least two of:
the system frame number of the frame within which the CSI-RS is received;
the direct frame number of the frame within which the CSI-RS is received;
the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS;
the indication of the absolute time at which the CSI-RS is received; or
the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
16. The method of claim 10 , wherein the first UE receives the CSI report in a medium access control-control element (MAC-CE) from the second UE.
17. The method of claim 16 , wherein the first UE receives the MAC-CE comprising the CSI report on a sidelink shared channel having associated sidelink control information indicating a source and a destination.
18. The method of claim 10 , wherein the first UE transmits the CSI report trigger in sidelink control information to the second UE.
19. An apparatus for wireless communication at a first user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a channel state information (CSI) report trigger from a second UE;
receive a channel state information reference signal (CSI-RS) from the second UE in a same slot as the CSI report trigger; and
transmit a CSI report to the second UE based on the CSI-RS, the CSI report comprising information identifying the CSI-RS on which the CSI report is based, wherein the information identifying the CSI-RS includes at least one of:
a system frame number or a direct frame number of a frame within which the CSI-RS is received;
a slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
an indication of an absolute time at which the CSI-RS is received;
a Hybrid Automatic Repeat Request (HARQ) process identifier for a slot or a shared channel within which the CSI-RS is received; or
a combination thereof.
20. The apparatus of claim 19 , wherein the information identifying the CSI-RS includes the system frame number or the direct frame number within which the CSI-RS is received.
21. The apparatus of claim 20 , wherein the information identifying the CSI-RS further includes the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received.
22. The apparatus of claim 19 , wherein the information identifying the CSI-RS includes the indication of the absolute time at which the CSI-RS is received.
23. The apparatus of claim 19 , wherein the information identifying the CSI-RS includes the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
24. The apparatus of claim 19 , wherein the information identifying the CSI-RS includes at least two of:
the system frame number of the frame within which the CSI-RS is received;
the direct frame number of the frame within which the CSI-RS is received;
the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
the indication of the absolute time at which the CSI-RS is received; or
the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
25. An apparatus for wireless communication at a first user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
transmit a channel state information (CSI) report trigger to a second UE;
transmit a channel state information reference signal (CSI-RS) to the second UE in a same slot as the CSI report trigger;
receive a CSI report from the second UE based on the CSI-RS, the CSI report comprising information identifying the CSI-RS on which the CSI report is based, wherein the information identifying the CSI-RS includes at least one of:
a system frame number or a direct frame number of a frame within which the CSI-RS is received;
a slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
an indication of an absolute time at which the CSI-RS is received;
a Hybrid Automatic Repeat Request (HARQ) process identifier for a slot or a shared channel within which the CSI-RS is received; or
a combination thereof; and
determine the CSI-RS on which the CSI report is based using the information comprised in the CSI report.
26. The apparatus of claim 25 , wherein the information identifying the CSI-RS includes the system frame number or the direct frame number of the frame within which the CSI-RS is received.
27. The apparatus of claim 26 , wherein the information identifying the CSI-RS further includes the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received.
28. The apparatus of claim 25 , wherein the information identifying the CSI-RS includes the indication of the absolute time at which the CSI-RS is received.
29. The apparatus of claim 25 , wherein the information identifying the CSI-RS includes the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.
30. The apparatus of claim 25 , wherein the information identifying the CSI-RS includes at least two of:
the system frame number of the frame within which the CSI-RS is received;
the direct frame number of the frame within which the CSI-RS is received;
the slot index within the system frame number or the direct frame number of the frame within which the CSI-RS is received;
the indication of the absolute time at which the CSI-RS is received; or
the HARQ process identifier for the slot or the shared channel within which the CSI-RS is received.