Techniques for simplifying channel state information feedback
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a capability report to a base station indicating a triggering offset. The base station may configure the UE with one or more channel state information (CSI) measurement resources and send downlink control information (DCI) that triggers an aperiodic CSI report for some of the CSI measurement resources. The UE may report CSI by measuring the CSI resources after the triggering offset. In some cases, CSI reporting related to the different codebook types (e. g., Type I, Type II) may be modified, where after identifying a type of codebook and determining which type of codebook to process (e. g., based on a number of CSI processing units), the UE may identify a priority associated with different CSI reports. The UE may be configured with various parameters that relax or modify the processing of Type II CSI reports.
1. A method for wireless communication at a user equipment (UE), comprising:
transmitting a capability report indicating an aperiodic channel state information measurement resource triggering offset supported by the UE, the capability report indicating the aperiodic channel state information measurement resource triggering offset that is a threshold duration after which the UE is capable of receiving one or more aperiodic channel state information measurement resources relative to receiving downlink control information;
receiving a configuration of the one or more aperiodic channel state information measurement resources;
receiving the downlink control information triggering a channel state information report for a first subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources, the downlink control information based at least in part on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource triggering offset; and
transmitting the channel state information report indicating a measurement of the first subset of aperiodic channel state information measurement resources.
2. The method of claim 1 , wherein transmitting the capability report comprises:
transmitting the capability report indicating the aperiodic channel state information measurement resource triggering offset that indicates a processing time supported by the UE for decoding the downlink control information.
3. The method of claim 1 , wherein the aperiodic channel state information measurement resource triggering offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.
4. The method of claim 1 , wherein transmitting the capability report comprises:
transmitting the capability report indicating a threshold number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring, wherein the channel state information report comprises a measurement for at least one of the one or more aperiodic channel state information measurement resources up to the threshold number of aperiodic channel state information measurement resources.
5. The method of claim 4 , wherein the threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring.
6. The method of claim 1 , wherein transmitting the capability report comprises:
transmitting the capability report comprising an indication of a buffering memory size, wherein the configuration of the one or more aperiodic channel state information measurement resources is based at least in part on the buffering memory size.
7. The method of claim 1 , wherein the channel state information report comprises an aperiodic channel state information report.
8. A method for wireless communication at a user equipment (UE), comprising:
receiving downlink control information that triggers a first channel state information report associated with a first type of codebook and a second channel state information report associated with a second type of codebook that differs from the first type of codebook;
identifying that the second channel state information report has a higher priority than the first channel state information report;
generating, based at least in part on the first type of codebook and the second type of codebook, the second channel state information report using a set of one or more channel state information processing units, wherein the second channel state information report is processed using at least a subset of channel state information processing units of the set of one or more channel state information processing units based at least in part on the second type of codebook;
refraining from updating the first channel state information report based at least in part on using at least the subset of channel state information processing units of the set of one or more channel state information processing units for generating the second channel state information report; and
transmitting the generated second channel state information report.
9. The method of claim 8 , wherein the first type of codebook comprises a Type II channel state information codebook.
10. A method for wireless communication at a user equipment (UE), comprising:
transmitting a capability report comprising a first capability indication of a UE capability for concurrent generation of a first channel state information report and a second channel state information report, a second capability indication for generation of the first channel state information report individually, a third capability indication for generation of the second channel state information report individually, or a combination thereof;
receiving downlink control information triggering the first channel state information report associated with a first type of codebook, or the second channel state information report associated with a second type of codebook that differs from the first type of codebook, or a combination thereof;
generating the first channel state information report using a first parameter set and the first type of codebook, or the second channel state information report using a second parameter set and the second type of codebook, or a combination thereof, based at least in part on the received downlink control information; and
transmitting the first channel state information report, or the second channel state information report, or a combination thereof.
11. The method of claim 10 , wherein generating the first channel state information report comprises:
identifying, from the first parameter set, a first set of channel state information computation times associated with the first channel state information report, the first set of channel state information computation times being different from a second set of channel state information computation times associated with the second channel state information report, the method further comprising:
transmitting the first channel state information report based at least in part on the first set of channel state information computation times.
12. The method of claim 11 , wherein generating the second channel state information report comprises:
identifying, from the second parameter set, the second set of channel state information computation times associated with the second channel state information report, the second set of channel state information computation times being different from the first set of channel state information computation times associated with the first channel state information report, the method further comprising:
transmitting the second channel state information report based at least in part on the second set of channel state information computation times.
13. The method of claim 10 , wherein generating the first channel state information report comprises:
identifying a rank threshold value associated with the first channel state information report based at least in part on the first parameter set, the method further comprising, the method further comprising:
transmitting the first channel state information report excluding a rank indicator based at least in part on the rank threshold value.
14. The method of claim 10 , further comprising:
identifying a first set of one or more aperiodic channel state information measurement resources based at least in part on the first parameter set, the first set of one or more aperiodic channel state information measurement resources being configured for aperiodic channel state information reporting, the method further comprising:
transmitting the first channel state information report that is generated based at least in part on measurement of the first set of one or more aperiodic channel state information measurement resources.
15. The method of claim 10 , wherein the first channel state information report comprises a wide band channel state information report.
16. The method of claim 10 , further comprising:
receiving an indication of the first parameter set and the second parameter set.
17. The method of claim 10 , wherein the first type of codebook comprises a Type II channel state information codebook.
18. The method of claim 10 , wherein at least a portion of the first parameter set is different from the second parameter set.
19. A method for wireless communication at a network device, comprising:
receiving a capability report;
identifying, from the capability report, a first capability indication for concurrent generation of a first channel state information report and a second channel state information report, a second capability indication for generation of the first channel state information report individually, a third capability indication for generation of the second channel state information report individually, or a combination thereof;
configuring a first parameter set for the first channel state information report associated with a first type of codebook and a second parameter set for the second channel state information report associated with a second type of codebook that differs from the first type of codebook;
transmitting downlink control information triggering the first channel state information report, or the second channel state information report, or a combination thereof; and
receiving the first channel state information report, or the second channel state information report, or a combination thereof, based at least in part on the received downlink control information, wherein the first channel state information report is based at least in part on the first parameter set, the second channel state information report is based at least in part on the second parameter set, or a combination thereof.
20. The method of claim 19 , further comprising:
configuring a first set of channel state information computation times associated with the first channel state information report, the first set of channel state information computation times being different from a second set of channel state information computation times associated with the second channel state information report, the method further comprising:
receiving the first channel state information report based at least in part on the first set of channel state information computation times.
21. The method of claim 20 , further comprising:
configuring the second set of channel state information computation times associated with the second channel state information report, the second set of channel state information computation times being different from the first set of channel state information computation times associated with the first channel state information report, the method further comprising:
receiving the second channel state information report based at least in part on the second set of channel state information computation times.
22. The method of claim 19 , further comprising:
configuring a rank threshold value associated with the first channel state information report based at least in part on the first parameter set, the method further comprising, the method further comprising:
receiving the first channel state information report excluding a rank indicator based at least in part on the rank threshold value.
23. The method of claim 19 , further comprising:
configuring a first set of one or more aperiodic channel state information measurement resources based at least in part on the first parameter set, the first set of one or more aperiodic channel state information measurement resources being configured for aperiodic channel state information reporting, the method further comprising:
receiving the first channel state information report over the first set of one or more aperiodic channel state information measurement resources.
24. The method of claim 19 , wherein the first channel state information report comprises a wide band channel state information report.
25. The method of claim 19 , further comprising:
transmitting an indication of the first parameter set and the second parameter set.