User equipment (UE) capability reporting in association with simultaneous uplink transmissions using multiple antenna panels

1 . A method comprising:

processing configuration information received from a base station, the configuration information associated with channel state information (CSI) group-based reporting;

causing capability index information to be sent to the base station, the capability index information indicating a set of capability indexes associated with the CSI group-based reporting, wherein for each antenna panel of a plurality of antenna panels of a user equipment (UE), the set of capability indexes indicates a set of antenna ports usable for uplink transmission from the antenna panel, the capability index information sent based on a UE-initiated trigger and absent a request of the base station for the capability index information; and

causing, based on the set of capability indexes, simultaneous uplink transmissions to the base station to be performed using the plurality of antenna panels.

2 . The method of claim 1 , wherein the capability index information is included in a CSI group-based report, wherein the CSI group-based report includes a first capability index corresponding to a first panel of the plurality of antenna panels and a second capability index corresponds to a second antenna panel of the plurality of antenna panels.

3 . The method of claim 2 , wherein the CSI group-based report associates the first capability index with a first resource group of CSI resources and the second capability index with the first resource group or a second resource group of CSI resources.

4 . The method of claim 1 , wherein the capability index information is included in a CSI group-based report, wherein the CSI group-based report includes a first capability index corresponding to a first panel of the plurality of antenna panels and to a second antenna panel of the plurality of antenna panels, and wherein the CSI group-based report associates the first capability index with a first resource group of CSI resources.

5 . The method of claim 1 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the standalone report excludes metrics of the CSI group-based report.

6 . The method of claim 1 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the standalone report includes, in addition to the capability index information, at least one of transmission configuration indication (TCI) state identifier or a sounding reference signal (SRS) resource set identifier.

7 . The method of claim 1 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein a plurality of transmission configuration indication (TCI) states is indicated or activated for the simultaneous uplink transmissions, and wherein the standalone report includes a first capability index that is mapped to a first TCI state of the plurality of TCI states, wherein the first TCI state represents an antenna panel of the plurality of antenna panels.

8 . The method of claim 1 , wherein the capability index information is sent in a standalone report different from a CSI group-based report.

9 . A baseband processor comprising:

processing circuitry configured to:

process configuration information received from a base station, the configuration information associated with channel state information (CSI) group-based reporting;

cause capability index information to be sent to the base station, the capability index information indicating a set of capability indexes associated with the CSI group-based reporting, wherein for each antenna panel of a plurality of antenna panels of an apparatus, the set of capability indexes indicates a set of antenna ports usable for uplink transmission from the antenna panel, the capability index information sent based on a apparatus-initiated trigger and absent a request of the base station for the capability index information; and

cause, based on the set of capability indexes, simultaneous uplink transmissions to the base station to be performed using the plurality of antenna panels; and

interface circuitry coupled with the processing circuitry, the interface circuitry configured to communicatively couple the processing circuitry with a component of an apparatus.

10 . The baseband processor of claim 9 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the configuration information indicates a plurality of sounding reference signal (SRS) resource sets for physical uplink shared channel (PUSCH) operations, and wherein the standalone report includes a first capability index that is mapped to a first SRS resource set of the plurality of SRS resource sets.

11 . The baseband processor of claim 9 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the configuration information indicates a control resource set (CORESET) group or pool index, and wherein the standalone report includes a first capability index that is mapped to the CORESET group or pool index.

12 . The baseband processor of claim 9 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the configuration information includes a first plurality of information elements that configure the apparatus to send the standalone report, wherein the first plurality of information elements includes an indicator of the standalone report, an indicator of a serving cell for which the standalone report is valid, a type of the standalone report, and a value for reporting a capability index, wherein the configuration information includes a second plurality of information elements that configure the apparatus to perform the CSI group-based reporting, and wherein the standalone report is generated independently of the second plurality of information elements.

13 . The baseband processor of claim 9 , wherein the capability index information is included in a CSI group-based report or in a standalone report different from the CSI group-based report and is initiated by the apparatus.

14 . The baseband processor of claim 9 , wherein the capability index information is sent in a report, wherein the report is initiated by the apparatus based on a set of conditions, wherein the set of conditions includes at least one of: a transmission configuration indication (TCI) state being indicated or activated, a sounding reference signal (SRS) resource set being reconfigured for uplink transmission, a power headroom (PHR) change exceeding a first threshold, or a power management maximum power reduction (P-MPR) change exceeding a second threshold.

15 . The baseband processor of claim 9 , wherein the capability index information is sent in a report, wherein the report is initiated by the apparatus based on a physical random access channel (PRACH) transmission, a scheduling request (SR) transmission, or an existing uplink grant.

16 . The baseband processor of claim 9 , wherein the capability index information is included in a standalone report different from a CSI group-based report, wherein the standalone report is sent in uplink control information (UCI) and indicates at least a first capability index, and wherein the first capability index has a same priority as or a different priority than the CSI group-based report.

17 . A method comprising:

sending, to a user equipment (UE) configuration information associated with channel state information (CSI) group-based reporting;

receiving, from the UE, capability index information indicating a set of capability indexes associated with the CSI group-based reporting, wherein for each antenna panel of a plurality of antenna panels of the UE, the set of capability indexes indicates a set of antenna ports usable for uplink transmission from the antenna panel, the capability index information received based on a UE-initiated trigger and absent a request of a base station for the capability index information; and

receiving, based on the set of capability indexes, simultaneous uplink transmissions from the UE using the plurality of antenna panels.

18 . The method of claim 17 , wherein the capability index information is a first capability index information, and wherein the method further comprises:

receiving, from the UE, second capability index information indicating a first capability index corresponding to a first antenna panel of the plurality of antenna panels and having a first value from a plurality of possible values, wherein the first value indicates that the first antenna panel is deactivated, wherein the second capability index information includes a second capability index corresponding to a second antenna panel of the plurality of antenna panels and having a second value, wherein the second value indicates that the second antenna panel is activated based on the first value indicating that the first antenna panel is deactivated.

19 . The method of claim 17 , wherein the capability index information includes a first capability index corresponding to a first antenna panel of the plurality of antenna panels and having a first value from a plurality of possible values, wherein a maximum of the plurality of possible values is larger than four.

20 . The method of claim 17 , wherein the set of capability indexes has a size that is larger than four, and wherein the set of capability indexes includes a first set of capability indexes corresponding to a first antenna panel of the plurality of antenna panels and a second set of capability indexes correspond to a second antenna panel of the plurality of antenna panels.