Polarization indication signaling for channel state information reference signals

1. A method of wireless communication performed by a network entity, comprising:

determining a polarization associated with a channel state information reference signal (CSI-RS) resource set configuration that is associated with a bandwidth part; and

transmitting, to a user equipment, a polarization indication that indicates the polarization associated with the CSI-RS resource set configuration.

2. The method of claim 1 , wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part, wherein the bandwidth part is associated with a polarization configuration that defines the polarization of the bandwidth part.

3. The method of claim 1 , further comprising:

determining polarizations for individual CSI-RSs associated with the CSI-RS resource set configuration; and

transmitting polarization indications corresponding to the individual CSI-RSs, wherein the polarization indications may correspond to different polarizations for the individual CSI-RSs.

4. The method of claim 1 , further comprising:

determining a first polarization of a first CSI-RS in the bandwidth part, wherein the first CSI-RS is associated with the CSI-RS resource set configuration; and

determining a second polarization of a second CSI-RS in the bandwidth part, wherein the second CSI-RS is associated with the CSI-RS resource set configuration; or

transmitting, to the user equipment, a time gap configuration that configures a time gap between the first CSI-RS and the second CSI-RS, wherein the time gap enables the user equipment to change between the first polarization when measuring the first CSI-RS to the second polarization when measuring the second CSI-RS.

5. The method of claim 1 , further comprising:

transmitting, to the user equipment, a CSI-RS configuration that configures a first CSI-RS and a second CSI-RS to overlap in time in a single bandwidth part, wherein the first CSI-RS and the second CSI-RS are associated with the CSI-RS resource set configuration, and the first CSI-RS is associated with a first polarization and the second CSI-RS is associated with a second polarization.

6. The method of claim 1 , further comprising:

transmitting, to the user equipment, a comb structure configuration that configures a first comb structure for a first CSI-RS in the bandwidth part and a second comb structure for a second CSI-RS in the bandwidth part, wherein the first CSI-RS and the second CSI-RS are associated with the CSI-RS resource set configuration, and the first CSI-RS is associated with a first polarization and the second CSI-RS is associated with a second polarization, wherein the first comb structure for the first CSI-RS does not overlap in a frequency domain with the second comb structure for the second CSI-RS.

7. The method of claim 1 , wherein the polarization associated with the CSI-RS resource set configuration is one of: a right hand circular polarization, a left hand circular polarization, a vertical linear polarization, or a horizontal linear polarization.

8. The method of claim 1 , wherein a polarization of a CSI-RS corresponds to the polarization associated with the CSI-RS resource set configuration, wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part.

9. The method of claim 1 , wherein a polarization of a CSI-RS corresponds to the polarization associated with the CSI-RS resource set configuration which includes the CSI-RS, wherein the bandwidth part is not associated with a polarization configuration.

10. The method of claim 1 , wherein the CSI-RS resource set configuration includes a CSI-RS resource configured with the polarization.

11. The method of claim 10 , further comprising:

determining the polarization for the CSI-RS resource based at least in part on an index, wherein the polarization is explicitly configured in the CSI-RS resource and the index represents one polarization selected from a plurality of polarizations;

determining the polarization for the CSI-RS resource based at least in part on a transmission configuration indicator state; or

determining the polarization for the CSI-RS resource based at least in part on a polarization of a CSI-RS associated with the CSI-RS resource.

12. The method of claim 10 , wherein the polarization for the CSI-RS resource is a nominal polarization mapped to an actual polarization based at least in part on a detection of a prior synchronization signal block.

13. A method of wireless communication performed by a user equipment, comprising:

receiving, from a network entity, a polarization indication that indicates a polarization associated with a channel state information reference signal (CSI-RS) resource set configuration that is associated with a bandwidth part; and

performing a communication with the network entity based at least in part on the polarization associated with the CSI-RS resource set configuration.

14. The method of claim 13 , wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part, wherein the bandwidth part is associated with a polarization configuration that defines the polarization of the bandwidth part.

15. The method of claim 13 , further comprising:

receiving, from the network entity, polarization indications corresponding to polarizations for individual CSI-RSs associated with the CSI-RS resource set configuration, wherein the polarization indications may correspond to different polarizations for the individual CSI-RSs.

16. The method of claim 13 , further comprising:

receiving, from the network entity, a time gap configuration that configures a time gap between a first CSI-RS associated with the CSI-RS resource set configuration and a second CSI-RS associated with the CSI-RS resource set configuration, wherein the first CSI-RS is associated with the bandwidth part and a first polarization, and the second CSI-RS is associated with the bandwidth part and a second polarization; and

changing between the first polarization when measuring the first CSI-RS and the second polarization when measuring the second CSI-RS, based at least in part on the time gap configuration that configures the time gap between the first CSI-RS and the second CSI-RS.

17. The method of claim 13 , further comprising:

receiving, from the network entity, a CSI-RS configuration that configures a first CSI-RS and a second CSI-RS to overlap in time in a single bandwidth part, wherein the first CSI-RS and the second CSI-RS are associated with the CSI-RS resource set configuration, and the first CSI-RS is associated with a first polarization and the second CSI-RS is associated with a second polarization.

18. The method of claim 13 , further comprising:

receiving, from the network entity, a comb structure configuration that configures a first comb structure for a first CSI-RS in the bandwidth part and a second comb structure for a second CSI-RS in the bandwidth part, wherein the first CSI-RS and the second CSI-RS are associated with the CSI-RS resource set configuration, and the first CSI-RS is associated with a first polarization and the second CSI-RS is associated with a second polarization, wherein the first comb structure for the first CSI-RS does not overlap in a frequency domain with the second comb structure for the second CSI-RS.

19. The method of claim 13 , wherein the polarization associated with the CSI-RS resource set configuration is one of: a right hand circular polarization, a left hand circular polarization, a vertical linear polarization, or a horizontal linear polarization.

20. The method of claim 13 , wherein a polarization of a CSI-RS corresponds to the polarization associated with the CSI-RS resource set configuration, wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part.

21. The method of claim 13 , wherein a polarization of a CSI-RS corresponds to the polarization associated with the CSI-RS resource set configuration which includes the CSI-RS, wherein the bandwidth part is not associated with a polarization configuration.

22. The method of claim 13 , wherein the CSI-RS resource set configuration includes a CSI-RS resource configured with the polarization.

23. The method of claim 22 , further comprising:

determining the polarization for the CSI-RS resource based at least in part on an index, wherein the polarization is explicitly configured in the CSI-RS resource and the index represents one polarization selected from a plurality of polarizations;

determining the polarization for the CSI-RS resource based at least in part on a transmission configuration indicator state; or

determining the polarization for the CSI-RS resource based at least in part on a polarization of a CSI-RS associated with the CSI-RS resource.

24. The method of claim 22 , wherein the polarization for the CSI-RS resource is a nominal polarization mapped to an actual polarization based at least in part on a detection of a prior synchronization signal block.

25. A network entity for wireless communication, comprising:

a memory; and

one or more processors, coupled to the memory, configured to:

determine a polarization associated with a channel state information reference signal (CSI-RS) resource set configuration that is associated with a bandwidth part; and

transmit, to a user equipment, a polarization indication that indicates the polarization associated with the CSI-RS resource set configuration.

26. The network entity of claim 25 , wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part, wherein the bandwidth part is associated with a polarization configuration that defines the polarization of the bandwidth part.

27. The network entity of claim 25 , wherein the one or more processors are further configured to:

determine polarizations for individual CSI-RSs associated with the CSI-RS resource set configuration; and

transmit polarization indications corresponding to the individual CSI-RSs, wherein the polarization indications may correspond to different polarizations for the individual CSI-RSs.

28. A user equipment for wireless communication, comprising:

a memory; and

one or more processors, coupled to the memory, configured to:

receive, from a network entity, a polarization indication that indicates a polarization associated with a channel state information reference signal (CSI-RS) resource set configuration that is associated with a bandwidth part; and

perform a communication with the network entity based at least in part on the polarization associated with the CSI-RS resource set configuration.

29. The user equipment of claim 28 , wherein the polarization associated with the CSI-RS resource set configuration corresponds to a polarization of the bandwidth part, wherein the bandwidth part is associated with a polarization configuration that defines the polarization of the bandwidth part.

30. The user equipment of claim 28 , wherein the one or more processors are further configured to:

receive, from the network entity, polarization indications corresponding to polarizations for individual CSI-RSs associated with the CSI-RS resource set configuration, wherein the polarization indications may correspond to different polarizations for the individual CSI-RSs.