Resource selection for single and multiple transmit/receive points (TRP) channel state information (CSI) reporting
This disclosure provides systems, methods and apparatus for wireless communications. In one aspect, a device, such as a user equipment (UE) may receive a configuration including one or more channel state information (CSI) measurement resources associated with a set of CSI hypotheses. The set of CSI hypotheses may correspond to a set of transmission configuration indicator (TCI) states, or a CSI interference measurement (CSIIM) resource, or both. The UE may select a first CSI measurement resource of the one or more CSI measurement resources for a channel measurement based on a CSI hypothesis of the set of CSI hypotheses. The UE also may select the CSIIM resource or a second CSI measurement resource for an interference measurement based on the CSI hypothesis of the set of CSI hypotheses. The UE may, as a result, transmit a report based on the channel measurement or the interference measurement, or both.
1 . A method for wireless communication at an apparatus of a user equipment (UE), comprising:
receiving a configuration including one or more channel state information (CSI) measurement resources associated with a set of CSI hypotheses, wherein the set of CSI hypotheses corresponds to a set of transmission configuration indicator (TCI) states, or a CSI interference measurement (CSIIM) resource, or both, wherein:
a first CSI hypothesis of the set of CSI hypotheses corresponds to a first TCI state and a second TCI state of the set of TCI states for a channel measurement;
a second CSI hypothesis of the set of CSI hypotheses corresponds to the first TCI state; and
a third CSI hypothesis of the set of CSI hypotheses corresponds to the second TCI state;
selecting a first CSI measurement resource of the one or more CSI measurement resources for the channel measurement based at least in part on a CSI hypothesis of the set of CSI hypotheses;
selecting the CSIIM resource or a second CSI measurement resource for an interference measurement based at least in part on the CSI hypothesis of the set of CSI hypotheses, the one or more CSI measurement resources comprises the first CSI measurement resource or the second CSI measurement resource, or both; and
transmitting a report based at least in part on the channel measurement or the interference measurement, or both.
2 . The method of claim 1 , wherein the second CSI measurement resource includes a non-zero power interference measurement resource (NZP-IMR) or the CSIIM resource.
3 . The method of claim 1 , further comprising:
selecting, based at least in part on the configuration, the first CSI measurement resource for the second CSI hypothesis corresponding to the first TCI state for the channel measurement.
4 . The method of claim 3 , further comprising:
determining a configured CSIIM resource for the second CSI hypothesis; and
determining to use the CSIIM resource for the interference measurement.
5 . The method of claim 3 , wherein each CSI-RS port of a non-zero power CSI reference signal (NZP CSI-RS) associated with the second CSI measurement resource comprises a single interference layer, the method further comprising:
selecting, based at least in part on a dynamic point selection of the second TCI state, the second CSI measurement resource as an NZP-IMR for the second CSI hypothesis.
6 . The method of claim 3 , further comprising:
selecting, based at least in part on a dynamic point selection of the second TCI state, the second CSI measurement resource as the CSIIM resource for the second CSI hypothesis; and
measuring an energy ratio associated with the second CSI measurement resource based at least in part on using the second CSI measurement resource as the CSIIM resource for the second CSI hypothesis.
7 . The method of claim 3 , further comprising:
selecting, based at least in part on a dynamic point selection of the second TCI state, the second CSI measurement resource as an NZP-IMR for the second CSI hypothesis;
estimating an energy ratio associated with each CSI-RS port based at least in part on using the second CSI measurement resource as the NZP-IMR for the second CSI hypothesis; and
aggregating the energy ratio associated with each CSI-RS port.
8 . The method of claim 3 , further comprising:
determining, based at least in part on a dynamic point selection of the second TCI state, that the second CSI measurement resource associated with a set of non-zero power CSI reference signal (NZP CSI-RS) ports corresponds to a set of interference layers;
selecting a precoding matrix to transform the set of NZP CSI-RS ports to the set of interference layers; and
transforming, in each radio frequency spectrum band or subband, the set of NZP CSI-RS ports to the set of interference layers based at least in part on a partial random precoding operation comprising a first precoding matrix or a second precoding matrix, or a combination thereof.
9 . The method of claim 1 , further comprising:
determining a dynamic point blanking of the second TCI state; and
estimating an interference associated with a set of non-zero power CSI reference signal (NZP CSI-RS) ports associated with the second CSI measurement resource.
10 . The method of claim 1 , further comprising:
selecting, based at least in part on the configuration, the second CSI measurement resource for the second CSI hypothesis or the third CSI hypothesis, or both, corresponding to the second TCI state for the channel measurement, wherein the UE determines that the CSIIM resource is an additional interference resource based at least in part on the configuration.
11 . The method of claim 10 , further comprising:
determining a configured CSIIM resource for the third CSI hypothesis; and
determining to use the CSIIM resource for the interference measurement.
12 . The method of claim 10 , further comprising:
selecting, based at least in part on a dynamic point selection of the first TCI state, the second CSI measurement resource as an NZP-IMR for the third CSI hypothesis.
13 . The method of claim 12 , wherein each CSI-RS port of a non-zero power CSI reference signal (NZP CSI-RS) associated with the second CSI measurement resource comprises a single interference layer, the method further comprising:
determining a first power control offset ratio associated with a CSI-RS port for the interference measurement based at least in part on selecting the second CSI measurement resource as the NZP-IMR; and
determining a second power control offset ratio associated with the CSI-RS port for the channel measurement based at least in part on selecting the second CSI measurement resource, wherein the first power control offset ratio is different from the second power control offset ratio.
14 . The method of claim 10 , further comprising:
selecting, based at least in part on a dynamic point selection of the first TCI state, the second CSI measurement resource as the CSIIM resource for the third CSI hypothesis; and
measuring an energy ratio associated with the second CSI measurement resource based at least in part on using the second CSI measurement resource as the CSIIM resource for the third CSI hypothesis.
15 . The method of claim 10 , further comprising:
selecting, based at least in part on a dynamic point selection of the first TCI state, the second CSI measurement resource as an NZP-IMR for the third CSI hypothesis;
estimating an energy ratio associated with each CSI-RS port based at least in part on using the second CSI measurement resource as the NZP-IMR for the third CSI hypothesis; and
aggregating the energy ratio associated with each CSI-RS port.
16 . The method of claim 10 , further comprising:
determining, based at least in part on a dynamic point selection of the first TCI state, that the second CSI measurement resource associated with a set of non-zero power CSI reference signal (NZP CSI-RS) ports corresponds to a set of interference layers, wherein a subset of NZP CSI-RS ports of the set of NZP CSI-RS ports correspond to a single interference layer of the set of interference layers.
17 . The method of claim 16 , further comprising:
selecting a precoding matrix to transform the set of NZP CSI-RS ports to the set of interference layers;
transforming, in each radio frequency spectrum band or subband, the set of NZP CSI-RS ports to the set of interference layers based at least in part on a random precoding operation; and
determining an average of the set of NZP CSI-RS ports to the set of interference layers based at least in part on the transforming.
18 . The method of claim 16 , further comprising:
selecting a precoding matrix to transform the set of NZP CSI-RS ports to the set of interference layers; and
transforming, in each band or subband, the set of NZP CSI-RS ports to the set of interference layers based at least in part on a partial random precoding operation comprising a first precoding matrix or a second precoding matrix, or a combination thereof.
19 . An apparatus for wireless communication at a user equipment (UE), comprising:
a first interface configured to:
receive a configuration including one or more channel state information (CSI) measurement resources associated with a set of CSI hypotheses, wherein the set of CSI hypotheses corresponds to a set of transmission configuration indicator (TCI) states, or a CSI interference measurement (CSIIM) resource, or both, wherein:
a first CSI hypothesis of the set of CSI hypotheses corresponds to a first TCI state and a second TCI state of the set of TCI states for a channel measurement;
a second CSI hypothesis of the set of CSI hypotheses corresponds to the first TCI state; and
a third CSI hypothesis of the set of CSI hypotheses corresponds to the second TCI state;
a processing system configured to:
select a first CSI measurement resource of the one or more CSI measurement resources for the channel measurement based at least in part on a CSI hypothesis of the set of CSI hypotheses; and
select the CSIIM resource or a second CSI measurement resource for an interference measurement based at least in part on the CSI hypothesis of the set of CSI hypotheses, the one or more CSI measurement resources comprises the first CSI measurement resource or the second CSI measurement resource, or both; and
wherein the first interface or a second interface is configured to:
output a report based at least in part on the channel measurement or the interference measurement, or both.