Method and apparatus for wireless communication
Embodiments of the present disclosure relates to methods and apparatuses for wireless communication. According to some embodiments of the present disclosure, a method includes: receiving a signaling indicating configuration information on a set of aperiodic channel state information reference signal (CSI-RS) resources corresponding to a trigger state in a downlink control information (DCI). The set of aperiodic CSI-RS resources may include a plurality of subsets of aperiodic CSI-RS resources; and receiving at least one aperiodic CSI-RS resource of the set of aperiodic CSI-RS resources according to the configuration information.
1. A method performed by a user equipment (UE), the method comprising:
receiving a signaling that indicates a set of aperiodic channel state information reference signal (CSI-RS) resources corresponding to a trigger state in a downlink control information (DCI), wherein the set of aperiodic CSI-RS resources comprises a plurality of subsets of aperiodic CSI-RS resources, and wherein respective subsets of aperiodic CSI-RS resources are associated with a time domain offset between the DCI and an aperiodic CSI-RS corresponding to the respective subsets of aperiodic CSI-RS resources; and
receiving at least one aperiodic CSI-RS based at least in part on at least one aperiodic CSI-RS resource of the set of aperiodic CSI-RS resources.
2. The method of claim 1 , wherein the signaling indicates a corresponding bandwidth part (BWP) index for the respective subsets of aperiodic CSI-RS resources.
3. A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive a signaling that indicates a set of aperiodic channel state information reference signal (CSI-RS) resources corresponding to a trigger state in a downlink control information (DCI), wherein the set of aperiodic CSI-RS resources comprises a plurality of subsets of aperiodic CSI-RS resources, and wherein respective subsets of aperiodic CSI-RS resources are associated with a time domain offset between the DCI and an aperiodic CSI-RS corresponding to the respective subsets of aperiodic CSI-RS resources; and
receive at least one aperiodic CSI-RS based at least in part on at least one aperiodic CSI-RS resource of the set of aperiodic CSI-RS resources.
4. The UE of claim 3 , wherein the signaling indicates a corresponding bandwidth part (BWP) index for the respective subsets of aperiodic CSI-RS resources.
5. The UE of claim 4 , wherein the at least one processor is further configured to cause the UE to transmit a CSI report indicating a reference signal received power (RSRP) value for the at least one aperiodic CSI-RS resource and an index of the at least one aperiodic CSI-RS resource.
6. The UE of claim 5 , wherein the at least one processor is further configured to cause the UE to index aperiodic CSI-RS resources in the set of aperiodic CSI-RS resources:
in increasing order of the aperiodic CSI-RS resources within a subset of aperiodic CSI-RS resources; and
in increasing order of BWP indices of the plurality of subsets of aperiodic CSI-RS resources.
7. The UE of claim 5 , wherein the at least one processor is further configured to cause the UE to index aperiodic CSI-RS resources in the set of aperiodic CSI-RS resources for the respective subsets of aperiodic CSI-RS resources in increasing order of the aperiodic CSI-RS resources within a corresponding subset of aperiodic CSI-RS resources, wherein the CSI report further indicates a BWP index of a subset of aperiodic CSI-RS resources to which the at least one aperiodic CSI-RS resource belongs.
8. The UE of claim 3 , wherein the time domain offset comprises a number of slots between the DCI and the aperiodic CSI-RS corresponding to the respective subsets of aperiodic CSI-RS resources with respect to a sub-carrier space (SCS), and wherein the DCI triggers the plurality of subsets of aperiodic CSI-RS resources.
9. The UE of claim 8 , wherein the SCS is configured by a radio resource control (RRC) signaling, or the SCS is based at least in part on an SCS of a bandwidth part (BWP) carrying the respective subsets of aperiodic CSI-RS resources or an SCS of a BWP carrying a preceding subset of aperiodic CSI-RS resources of the subset of aperiodic CSI-RS resources, or the SCS is predefined for a frequency range.
10. The UE of claim 3 , wherein the signaling indicates a first offset for a first subset of aperiodic CSI-RS resources of the plurality of subsets of aperiodic CSI-RS resources, and the first subset of aperiodic CSI-RS resources is closest to the DCI in a time domain among the plurality of subsets of aperiodic CSI-RS resources.
11. The UE of claim 10 , wherein the first offset is based at least in part on one or more of:
a sub-carrier space (SCS) of a bandwidth part (BWP) carrying the DCI, wherein the DCI triggers the plurality of subsets of aperiodic CSI-RS resources;
an SCS of a BWP carrying the first subset of aperiodic CSI-RS resources; or
an SCS predefined for a frequency range.
12. The UE of claim 10 , wherein the at least one processor is further configured to cause the UE to:
determine a second offset between a second subset of aperiodic CSI-RS resources of the plurality of subsets of aperiodic CSI-RS resources and a third subset of aperiodic CSI-RS resources of the plurality of subsets of aperiodic CSI-RS resources, wherein the third subset of aperiodic CSI-RS resources is subsequent to the second subset of aperiodic CSI-RS resources in the time domain; and
determine a time domain offset of the third subset of aperiodic CSI-RS resources based at least in part on the first offset and the second offset.
13. The UE of claim 12 , wherein the second offset is based at least in part on one or more of:
a sub-carrier space (SCS) of a bandwidth part (BWP) carrying the DCI, wherein the DCI triggers the plurality of subsets of aperiodic CSI-RS resources;
an SCS of a BWP carrying the second subset of aperiodic CSI-RS resources;
an SCS of a BWP carrying the third subset of aperiodic CSI-RS resources; or
an SCS predefined for a frequency range.
14. The UE of claim 12 , wherein the second offset is based at least in part on a BWP switch delay or is predefined.
15. The UE of claim 3 , wherein the at least one processor is further configured to cause the UE to transmit a CSI report indicating a reference signal received power (RSRP) value for the at least one aperiodic CSI-RS resource and an index of the at least one aperiodic CSI-RS resource.
16. The UE of claim 15 , wherein the at least one processor is further configured to cause the UE to index aperiodic CSI-RS resources in the set of aperiodic CSI-RS resources:
in increasing order of the aperiodic CSI-RS resources within a subset of aperiodic CSI-RS resources; and
in increasing order of subset indices of the plurality of subsets of aperiodic CSI-RS resources.
17. The UE of claim 15 , wherein the at least one processor is further configured to cause the UE to index aperiodic CSI-RS resources in the set of aperiodic CSI-RS resources for the respective subsets of aperiodic CSI-RS resources in increasing order of the aperiodic CSI-RS resources within a corresponding subset of aperiodic CSI-RS resources, wherein the CSI report further indicates a subset index of a subset of aperiodic CSI-RS resources to which the at least one aperiodic CSI-RS resource belongs.
18. The UE of claim 3 , wherein the at least one processor is further configured to cause the UE to:
switch to a first bandwidth part (BWP) to receive the at least one aperiodic CSI-RS resource triggered by the DCI in a second BWP; and
after channel state information measurement for the plurality of subsets of aperiodic CSI-RS resources, switch back to the second BWP for information transmission or reception.
19. A network equipment (NE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
transmit a signaling that indicates a set of aperiodic channel state information reference signal (CSI-RS) resources corresponding to a trigger state in a downlink control information (DCI), wherein the set of aperiodic CSI-RS resources comprises a plurality of subsets of aperiodic CSI-RS resources, and wherein respective subsets of aperiodic CSI-RS resources are associated with a time domain offset between the DCI and an aperiodic CSI-RS corresponding to the respective subsets of aperiodic CSI-RS resources; and
transmit at least one aperiodic CSI-RS based at least in part on at least one aperiodic CSI-RS resource of the set of aperiodic CSI-RS resources.
20. A processor for wireless communication, comprising:
at least one controller and coupled with at least one memory and configured to cause the processor to:
receive a signaling that indicates a set of aperiodic channel state information reference signal (CSI-RS) resources corresponding to a trigger state in a downlink control information (DCI), wherein the set of aperiodic CSI-RS resources comprises a plurality of subsets of aperiodic CSI-RS resources, and wherein respective subsets of aperiodic CSI-RS resources are associated with a time domain offset between the DCI and an aperiodic CSI-RS corresponding to the respective subsets of aperiodic CSI-RS resources; and
receive at least one aperiodic CSI-RS based at least in part on at least one aperiodic CSI-RS resource of the set of aperiodic CSI-RS resources.