CSI report configuration for multi-TRP transmission

1. A method for wireless communication by a base station (BS), comprising:

providing a user equipment (UE) with a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

signaling the UE to enable the UE to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port group,

the signaling configures the UE to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report,

the number of CSI-RS resources is greater than one,

the CSI report configuration configures the UE to report a rank indicator (RI) indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the RI and a codepoint of the RI are based at least in part on a number of possible combinations of ranks for the selected CSI-RS resources; and

receiving a CSI report from the UE.

2. The method of claim 1 , wherein:

the CSI-RS resources comprises one or more non-zero power (NZP) CSI-RS resources for channel measurement (CM).

3. The method of claim 1 , wherein the CSI report configuration configures the UE to report at least one of: a precoding matrix indicator (PMI) or a channel quality indicator (CQI) associated with a rank for each of the selected CSI-RS resources or port groups.

4. The method of claim 1 , wherein:

the CSI report configuration configures the UE to report a CSI resource indicator (CRI) indicating the selected CSI-RS resources; and

a number of bits for the CRI is based at least in part on a number of possible combinations of CSI-RS resources the UE can select.

5. The method of claim 1 , wherein:

the RI includes one or more padding bits to keep a common bitwidth for RI for all possible combination of ranks in all possible resources selections.

6. The method of claim 1 , wherein:

the CSI report configuration configures at least one CSI-RS resource comprising multiple port groups.

7. The method of claim 6 , wherein the CSI report configuration configures the UE to report a precoding matrix indicator (PMI) and a channel quality indicator (CQI) associated with a rank for each selected CSI-RS resource or each of the port groups of a selected CSI-RS resource comprising multiple port groups.

8. A method for wireless communication by a user equipment (UE), comprising:

receiving a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

receiving signaling enabling the UE to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port groups,

the signaling configures the UE to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report; and

the number of CSI-RS resources is greater than one; and

sending a CSI report,

the CSI report including a rank indicator (RI) indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the RI and a definition of a codepoint of the RI are based at least in part on a number of possible combinations of ranks for the selected CSI-RS resources.

9. The method of claim 8 , wherein:

the CSI-RS resources comprises one or more non-zero power (NZP) CSI-RS resources for channel measurement (CM).

10. The method of claim 8 , wherein the CSI report includes a precoding matrix indicator (PMI) and a channel quality indicator (CQI) associated with a rank for each of the selected CSI-RS resources.

11. The method of claim 8 , wherein:

the CSI report includes a CSI resource indicator (CRI) indicating the selected CSI-RS resources; and

a number of bits for the CRI is based at least in part on a number of possible combinations of CSI-RS resources the UE can select.

12. The method of claim 8 , wherein:

the RI includes one or more padding bits to keep a common bitwidth for RI for all possible combination of ranks in all possible resources selections.

13. The method of claim 8 , wherein:

the CSI report configuration configures at least one CSI-RS resource comprising multiple port groups.

14. The method of claim 13 , wherein the CSI report includes a precoding matrix indicator (PMI) and a channel quality indicator (CQI) associated with a rank for each selected CSI-RS resource or each of the port groups of a selected CSI-RS resource comprising multiple port groups.

15. An apparatus for wireless communication, comprising:

means for providing a user equipment (UE) with a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

means for signaling the UE to enable the UE to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port group,

the signaling configures the UE to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report,

the number of CSI-RS resources is greater than one,

the CSI report configuration configures the UE to report a joint CSI resource indicator (CRI) and rank indicator (RI), the CRI indicating the selected CSI-RS resources and the RI indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the joint CRI and RI are based at least in part on a number of possible combinations of CSI-RS resources the UE can select and ranks for the selected CSI-RS resources; and

means for receiving a CSI report from the UE.

16. An apparatus for wireless communication, comprising:

means for receiving a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

means for receiving signaling enabling the apparatus to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port groups,

the signaling configures the apparatus to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report, and

the number of CSI-RS resources is greater than one; and

means for sending a CSI report,

the CSI report including a joint CSI resource indicator (CRI) and rank indicator (RI), the CRI indicating the selected CSI-RS resources and the RI indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the joint CRI and RI are based at least in part on a number of possible combinations of CSI-RS resources the UE can select and ranks for the selected CSI-RS resources.

17. An apparatus for wireless communication, comprising:

at least one processor coupled with at least one memory and configured to provide a user equipment (UE) with a channel state information (CSI) report configuration, wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups, and the CSI report configuration configures at least one CSI-RS resource comprising multiple port groups;

a transmitter configured to signal the UE to enable the UE to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port group,

the signal configures the UE to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report,

the number of CSI-RS resources is greater than one,

the CSI report configuration configures the UE to report a CSI resource indicator (CRI) and a rank indicator (RI), the CRI indicating the selected CSI-RS resource and the RI indicating one or more ranks associated with the selected CSI-RS resource or with each of the port groups of the selected CSI-RS resource, and

a number of bits for the RI and a codepoint of the RI are based at least in part on a number of port groups in the selected CSI-RS resource; and a receiver configured to receive a CSI report from the UE.

18. An apparatus for wireless communication, comprising:

a receiver configured to:

receive a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups, and the CSI report configuration configures at least one CSI-RS resource comprising multiple port groups;

receive signaling enabling the apparatus to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port groups,

the signaling configures the apparatus to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report, and

the number of CSI-RS resources is greater than one; and

a transmitter configured to send a CSI report,

the CSI report including a CSI resource indicator (CRI) and a rank indicator (RI), the CRI indicating the selected CSI-RS resource and the RI indicating one or more ranks associated with the selected CSI-RS resource or with each of the port groups of the selected CSI-RS resource, and

a number of bits for the RI and each codepoint of the RI are based at least in part on a number of port groups in the selected CSI-RS resource.

19. A non-transitory computer readable medium having computer executable code stored thereon for wireless communication, comprising:

code for providing a user equipment (UE) with a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

code for signaling the UE to enable the UE to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port group,

the signaling configures the UE to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report,

the number of CSI-RS resources is greater than ones the CSI report configuration configures the UE to report a rank indicator (RI) indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the RI and a codepoint of the RI are based at least in part on a number of possible combinations of ranks for the selected CSI-RS resources; and

code for receiving a CSI report from the UE.

20. A non-transitory computer readable medium having computer executable code stored thereon for wireless communication, comprising:

code for receiving a channel state information (CSI) report configuration,

wherein the CSI report configuration is associated with CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups;

code for receiving signaling enabling a user equipment (UE) to send a CSI report including CSI for more than one CSI-RS resource or for a CSI-RS resource comprising more than one port groups,

the signaling configures a user equipment to select a number of CSI-RS resources or up to the number of CSI-RS resources, of the CSI-RS resources that are configured, for the CSI report, and

the number of CSI-RS resources is greater than one; and

code for sending a CSI report,

the CSI report including a rank indicator (RI) indicating ranks with each of the selected CSI-RS resources, and

a number of bits for the RI and a definition of a codepoint of the RI are based at least in part on a number of possible combinations of ranks for the selected CSI-RS resources.