Method and apparatus for resource-based CSI acquisition in advanced wireless communication systems
A method of a user equipment (UE) in a wireless communication system is provided. The method comprises receiving, from at least one transmission and reception point (TRP) of a group of (N) TRPs, channel status information (CSI) configuration information, determining a CSI report based on the CSI configuration information, identifying, based on the configuration information, one or more TRPs of the group of (N) TRPs to transmit the determined CSI report, and transmitting, to the one or more TRPs, the determined CSI report over an uplink channel. The determined CSI report includes a TRP indicator for selecting (M) TRPs of the group of (N) TRPs, and CSI for each of the selected (M) TRPs, wherein N is greater than one, and wherein M is greater or equal to 1, and less or equal to N.
1. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver configured to receive, from a base station, configuration information for a channel state information reference signal (CSI-RS) resource set comprising CSI-RS resources, the CSI-RS resources grouped into a first group and a second group; and
a processor operably coupled to the transceiver, the processor configured to:
identify CSI associated with at least two CSI-RS resources from the CSI-RS resource set; and
determine a CSI report to include a CSI reference signal resource indicator (CRI) corresponding to the at least two CSI-RS resources associated with the identified CSI, wherein the CSI report includes a rank indicator (RI) field, wherein the RI field corresponds to two RIs for the CSI associated with the at least two CSI-RS resources, and wherein the RI field corresponds to a rank combination (RI1, RI2), the (RI1, RI2) being one of (1,1), (2,1), (2,1), (2,2),
wherein the transceiver is further configured to transmit, to the base station, the determined CSI report,
wherein the CSI associated with the at least two CSI-RS resources is identified based on a resource pair that consists of one resource from the first group and one resource from the second group, and
wherein the CRI corresponds to the resource pair for the CSI associated with the at least two CSI-RS resources.
2. The UE of claim 1 , wherein:
the processor is further configured to identify CSI associated with a single CSI-RS resource from the first group or the second group,
the CSI report further includes a CRI corresponding to the single CSI-RS resource for the CSI associated with the single CSI-RS resource, and
a RI field corresponds to a single RI for the CSI associated with the single CSI-RS resource.
3. The UE of claim 1 , wherein:
the CSI report includes the CRI, the RI, a channel quality indicator (CQI), and a precoding matrix indicator (PMI), or
the CSI report includes the CRI, the RI, the CQI, the PMI, and a layer indicator (LI).
4. The UE of claim 1 , wherein:
the determined CSI report is partitioned into CSI part 1 and CSI part 2,
the CSI part 1 includes the CRI and is used to identify a number of information bits in the CSI part 2, a payload of CSI part 1 being fixed, and
the number of information bits in the CSI part 2 is identified based on the CRI of the CSI part 1.
5. The UE of claim 1 , wherein:
the CSI-RS resource set comprises non-zero power (NZP) CSI-RS resources for channel measurement, and
an interference measurement for the CSI is based on CSI interference measurement (CSI-IM) resource.
6. A base station in a wireless communication system, the base station comprising:
a transceiver configured to:
transmit, to a user equipment (UE) configuration information for a channel state information reference signal (CSI-RS) resource set comprising CSI-RS resources, the CSI-RS resources grouped into a first group and a second group; and
receive, from the UE, a CSI report including a CSI reference signal resource indicator (CRI) corresponding to at least two CSI-RS resources associated with a CSI,
wherein the CSI report includes a rank indicator (RI) field,
wherein the RI field corresponds to two RIs for the CSI associated with the at least two CSI-RS resources,
wherein the RI field corresponds to a rank combination (RI1, RI2), the (RI1, RI2) being one of (1,1), (2,1), (2,1), (2,2),
wherein the at least two CSI-RS resources are from the CSI-RS resource set,
wherein the CSI associated with the at least two CSI-RS resources is identified based on a resource pair that consists of one resource from the first group and one resource from the second group, and
wherein the CRI corresponds to the resource pair for the CSI associated with the at least two CSI-RS resources.
7. The base station of claim 6 , wherein:
the CSI report further includes a CRI that corresponds to a single CSI-RS resource for a CSI associated with the single CSI-RS resource, and
a RI field corresponds to a single RI for the CSI associated with the single CSI-RS resource.
8. The base station of claim 6 , wherein:
the received CSI report is partitioned into CSI part 1 and CSI part 2,
the CSI part 1 includes the CRI and is used to identify a number of information bits in the CSI part 2, a payload of CSI part 1 being fixed, and
the number of bits in the CSI part 2 is identified based on the CRI of the CSI part 1.
9. The base station of claim 6 , wherein:
the CSI-RS resource set comprises non-zero power (NZP) CSI-RS resources for channel measurement, and
an interference measurement for the CSI is based on CSI interference measurement (CSI-IM) resource.
10. A method of a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, configuration information for a channel state information reference signal (CSI-RS) resource set comprising CSI-RS resources, the CSI-RS resources grouped into a first group and a second group;
identifying CSI associated with at least two CSI-RS resources from the CSI-RS resource set;
determining a CSI report to include a CSI reference signal resource indicator (CRI) corresponding to the at least two CSI-RS resources associated with the identified CSI, wherein the CSI report includes a rank indicator (RI) field, wherein the RI field corresponds to two RIs for the CSI associated with the at least two CSI-RS resources, and wherein the RI field corresponds to a rank combination (RI1, RI2), the (RI1, RI2) being one of (1,1), (2,1), (2,1), (2,2); and
transmitting, to the base station, the determined CSI report,
wherein the CSI associated with the at least two CSI-RS resources is identified based on a resource pair that consists of one resource from the first group and one resource from the second group, and
wherein the CRI corresponds to the resource pair for the CSI associated with the at least two CSI-RS resources.
11. The method of claim 10 , further comprising:
identifying CSI associated with a single CSI-RS resource from the first group or the second group,
wherein the CSI report further includes a CRI corresponding to the single CSI-RS resource for the CSI associated with the single CSI-RS resource, and
wherein a RI field corresponds to a single RI for the CSI associated with the single CSI-RS resource.
12. The method of claim 10 , wherein:
the CSI report includes the CRI, the RI, a channel quality indicator (CQI), and a precoding matrix indicator (PMI), or
the CSI report includes the CRI, the RI, the CQI, the PMI, and a layer indicator (LI).
13. The method of claim 10 , wherein:
the determined CSI report is partitioned into CSI part 1 and CSI part 2,
the CSI part 1 includes the CRI and is used to identify a number of information bits in the CSI part 2, a payload of CSI part 1 being fixed, and
the number of information bits in the CSI part 2 is identified based on the CRI of the CSI part 1.
14. The method of claim 10 , wherein:
the CSI-RS resource set comprises non-zero power (NZP) CSI-RS resources for channel measurement, and
an interference measurement for the CSI is based on CSI interference measurement (CSI-IM) resource.