Techniques for reporting channel state information (CSI) for an unlicensed radio frequency spectrum band

1. A method of wireless communication at a user equipment (UE), comprising:

receiving downlink control information (DCI), the DCI including a channel state information (CSI) request;

determining, based at least in part on the CSI request, a CSI for a component carrier, wherein the CSI is based at least in part on measurements for a last subframe that is a most recent subframe for which measurements for a clear channel assessment was successful, wherein the most recent subframe is a most recent subframe with respect to receiving the DCI;

selecting, based at least in part on a content of the measurements, a CSI subframe associated with reporting channel state information; and

transmitting the CSI in the selected CSI subframe.

2. The method of claim 1 , wherein the CSI request comprises one or more bits of a CSI request field.

3. The method of claim 2 , wherein the one or more bits of the CSI request field indicate whether to report the CSI.

4. The method of claim 2 , wherein the reporting of the CSI is prioritized based at least in part on the CSI request field.

5. The method of claim 1 , wherein:

transmitting the CSI in the selected CSI subframe is based at least in part on a priority level associated with reporting the CSI and a shared resource of the CSI subframe.

6. The method of claim 1 , wherein the CSI subframe is associated with one of a downlink subframe or a special subframe.

7. The method of claim 1 , wherein the DCI is received from a base station configured to transmit in a carrier aggregation mode based at least in part on utilizing both a licensed radio frequency spectrum band and an unlicensed radio frequency spectrum band.

8. The method of claim 1 , wherein the DCI comprises an indication associated with aperiodic CSI reporting, wherein the indication comprises a 0 value state or a 1 value state.

9. An apparatus for wireless communication at a user equipment (UE), comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive downlink control information (DCI), the DCI including a channel state information (CSI) request;

determine, based at least in part on the CSI request, a CSI for a component carrier, wherein the CSI is based at least in part on measurements for a last subframe that is a most recent subframe for which measurements for a clear channel assessment was successful, wherein the most recent subframe is a most recent subframe with respect to receiving the DCI;

select, based at least in part on a content of the measurements, a CSI subframe associated with reporting channel state information; and

transmit the CSI in the selected CSI subframe.

10. The apparatus of claim 9 , wherein the CSI request comprises one or more bits of a CSI request field.

11. The apparatus of claim 10 , wherein the one or more bits of the CSI request field indicate whether to report the CSI.

12. The apparatus of claim 10 , wherein the reporting of the CSI is prioritized based at least in part on the CSI request field.

13. The apparatus of claim 9 , wherein transmitting the CSI in the selected CSI subframe is based at least in part on a priority level associated with reporting the CSI and a shared resource of the CSI subframe.

14. The apparatus of claim 9 , wherein the CSI subframe is associated with one of a downlink subframe or a special subframe.

15. The apparatus of claim 9 , wherein the DCI is received from a base station configured to transmit in a carrier aggregation mode based at least in part on utilizing both a licensed radio frequency spectrum band and an unlicensed radio frequency spectrum band.

16. The apparatus of claim 9 , wherein the DCI comprises an indication associated with aperiodic CSI reporting, wherein the indication comprises a 0 value state or a 1 value state.

17. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:

receive downlink control information (DCI), the DCI including a channel state information (CSI) request;

determine, based at least in part on the CSI request, a CSI for a component carrier, wherein the CSI is based at least in part on measurements for a last subframe that is a most recent subframe for which measurements for a clear channel assessment was successful, wherein the most recent subframe is a most recent subframe with respect to receiving the DCI;

select, based at least in part on a content of the measurements, a CSI subframe associated with reporting channel state information; and

transmit the CSI in the selected CSI subframe.

18. The non-transitory computer-readable medium of claim 17 , wherein the CSI request comprises one or more bits of a CSI request field that indicate whether to report the CSI.

19. The non-transitory computer-readable medium of claim 18 , wherein the reporting of the CSI is prioritized based at least in part on the CSI request field.