Method and apparatus for beam management on sidelink
Embodiments of the present application are directed to a method and apparatus for beam management on sidelink. A method for wireless communication performed by a first user equipment (UE) is disclosed, the method may include: transmitting, to a second UE, an index indicating channel state information (CSI) reporting configuration information including a CSI reporting configuration item, wherein a type of CSI reporting is set in the index; and transmitting information of candidate beams of the first UE when the type of CSI reporting is set as round-trip in the index.
1. A method for wireless communication performed by a first user equipment (UE), comprising:
transmitting, to a second UE, an index indicating channel state information (CSI) reporting configuration information including a CSI reporting configuration item, wherein a type of CSI reporting is set in the index; and
transmitting information of candidate beams of the first UE when the type of CSI reporting is set as round-trip in the index.
2. The method of claim 1 , wherein CSI measurement is triggered by transmitting a first indicator or is triggered by the transmitting of the index.
3. The method of claim 1 , further comprising:
transmitting, to the second UE, one or more CSI-RS.
4. An apparatus, comprising:
a receiver;
a transmitter; and
a processor coupled to the receiver and the transmitter configured to cause the apparatus to, wherein the apparatus comprises a first user equipment (UE):
transmit, to a second UE, an index indicating channel state information (CSI) reporting configuration information including a CSI reporting configuration item, wherein a type of CSI reporting is set in the index; and
transmit information of candidate beams of the apparatus when the type of CSI reporting is set as round-trip in the index.
5. The apparatus of claim 4 , wherein when the type of CSI reporting is set as round-trip in the index, the processor, the receiver and the transmitter are further configured to cause the apparatus to:
receive a first CSI report and second one or more CSI-RS;
perform measurement on the received second one or more CSI-RS with the candidate beams; and
select a beam within the candidate beams based on measurement results.
6. The apparatus of claim 5 , wherein to perform measurement on the received second one or more CSI-RS with the candidate beams comprises doing a beam sweep to measure on the received second CSI-RS in sequence over the candidate beams.
7. The apparatus of claim 4 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
transmit a second indicator to trigger a beam establishment procedure and a report of UE capability of the apparatus; and
receive a report of UE capability of the second UE from the second UE.
8. The apparatus of claim 4 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
transmit a report of UE capability of the apparatus; and
receive a report of UE capability of the second UE from the second UE.
9. The apparatus of claim 4 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
transmit geolocation information of the apparatus;
receive geolocation information of the second UE; and
select an initial beam as a current beam of the apparatus based on the geolocation information of the apparatus and the received geolocation information of the second UE.
10. The apparatus of claim 9 , wherein to select the initial beam comprises selecting an initial panel.
11. An apparatus, comprising:
at least one non-transitory computer-readable medium having computer executable instructions stored therein;
a receiver;
a transmitter; and
a processor coupled to the receiver and the transmitter configured to cause the apparatus to, wherein the apparatus comprises a first user equipment (UE):
receive, from a second UE, an index indicating CSI reporting configuration information including a CSI reporting configuration item, wherein a type of CSI reporting is set in the index; and
in response to the type of CSI reporting is set as round-trip in the index, receive information of candidate beams of the second UE.
12. The apparatus of claim 11 , wherein CSI measurement is triggered by receiving a first indicator from the second UE or is triggered by the index.
13. The apparatus of claim 11 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
receive first one or more CSI-RS;
perform measurement on the first one or more CSI-RS with candidate beams of the apparatus; and
select a beam based on measurement results.
14. The apparatus of claim 11 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
receive a second indicator for triggering a beam establishment procedure and a report of UE capability of the second UE; and
in response to the received second indicator, transmit a report of UE capability of the apparatus to the second UE.
15. The apparatus of claim 11 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
receive a report of UE capability of the second UE from the second UE; and
transmit a report of UE capability of the apparatus to the second UE.
16. The apparatus of claim 11 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
receive geolocation information of the second UE;
select an initial beam as a current beam of the apparatus based on the geolocation information of the apparatus and the received geolocation information of the second UE; and
transmit geolocation information of the apparatus.
17. The apparatus of claim 4 , wherein the processor, the receiver and the transmitter are further configured to cause the apparatus to:
transmit, to the second UE, first one or more CSI-RS.
18. The apparatus of claim 17 , wherein CSI measurement is triggered by transmitting a first indicator or is triggered by the transmitting of the index.
19. The apparatus of claim 18 , wherein the first indicator or the index for triggering CSI measurement is transmitted via sidelink control information (SCI), and first one or more CSI-RS is transmitted in physical sidelink share channel (PSSCH) corresponding to the SCI.
20. The apparatus of claim 17 , wherein the first one or more CSI-RS is respectively transmitted via one or more resources selected by the apparatus, or via one or more resources scheduled by a base station or another UE.