CSI-RS configuration for partial band retuning

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

receiving from an access network entity a radio resource control (RRC) message indicating a set of two or more possible channel state information reference signal (CSI-RS) configurations for a partial band of a plurality of partial bands within a total configured bandwidth of the UE;

receiving downlink control information (DCI) from the access network entity, the DCI indicating a set of downlink resources associated with a first partial band of the plurality of partial bands;

selecting a first CSI-RS configuration from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on the DCI; and

obtaining CSI measurements over the set of downlink resources in the first partial band using the selected first CSI-RS configuration.

2. The method of claim 1 , further comprising:

retuning a receiver of the UE to the first partial band from a second partial band based at least in part on the received DCI.

3. The method of any one of claim 1 or claim 2 , further comprising:

selecting one or more CSI-RS configurations from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on periodic CSI-RS information in the received RRC message.

4. The method of claim 1 , further comprising:

selecting one or more configurations from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on semi-persistent CSI-RS information in the received RRC message.

5. The method of claim 4 , wherein selecting the one or more CSI-RS configurations comprises:

receiving an indication of the first CSI-RS configuration in the DCI.

6. The method of claim 1 , further comprising:

receiving a media access control (MAC) layer message.

7. The method of claim 6 , further comprising:

transmitting a channel state information (CSI) report to the access network entity based at least in part on the CSI-RS measurements over the first partial band.

8. The method of claim 6 , wherein at least one CSI-RS configuration of the set of two or more possible CSI-RS configurations corresponds to a zero power (ZP) CSI-RS, and at least one CSI-RS configuration of the set of two or more possible CSI-RS configurations corresponds to a non-zero power (NZP) CSI-RS.

9. The method of claim 1 , wherein the set of two or more possible CSI-RS configurations comprises at least two subsets of possible CSI-RS configurations corresponding to different CSI-RS time-domain characteristics.

10. The method of claim 9 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to periodic CSI-RS configurations.

11. The method of claim 9 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to aperiodic CSI-RS configurations.

12. The method of claim 9 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to semi-persistent CSI-RS configurations.

13. A method for wireless communication, comprising:

transmitting a radio resource control (RRC) message to a user equipment (UE) indicating a set of two or more possible channel state information reference signal (CSI-RS) configurations for a partial band of a plurality of partial bands within a total configured bandwidth of the UE;

transmitting downlink control information (DCI) to the UE, the DCI indicating a set of downlink resources associated with a first partial band of the plurality of partial bands;

selecting a CSI-RS configuration from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on the set of downlink resources; and

performing CSI-RS transmissions during the set of downlink resources in the first partial band according to the selected CSI-RS configuration.

14. The method of claim 13 , further comprising:

transmitting instructions to retune a receiver of the UE to the first partial band from a second partial band based on the DCI.

15. The method of claim 13 , further comprising:

selecting a CSI-RS configuration from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on periodic CSI-RS information in the transmitted RRC message.

16. The method of claim 13 , further comprising:

selecting a CSI-RS configuration from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on semi-persistent CSI-RS information in the transmitted RRC message.

17. The method of claim 13 , further comprising:

transmitting a media access control (MAC) layer message.

18. The method of claim 13 , wherein selecting the CSI-RS configuration comprises:

transmitting an indication of the first CSI-RS configuration in the DCI.

19. The method of claim 14 , further comprising:

receiving a channel state information (CSI) report from the UE based at least in part on the performed CSI-RS transmission according to the selected CSI-RS configuration.

20. The method of claim 13 , wherein at least one CSI-RS configuration of the set of two or more possible CSI-RS configurations corresponds to a zero power (ZP) CSI-RS, and at least one CSI-RS configuration of the set of two or more possible CSI-RS configurations corresponds to a non-zero power (NZP) CSI-RS.

21. The method of claim 13 , wherein the set of two or more possible CSI-RS configurations comprises at least two subsets of possible CSI-RS configurations corresponding to different CSI-RS time-domain characteristics.

22. The method of claim 21 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to periodic CSI-RS configurations.

23. The method of claim 21 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to aperiodic CSI-RS configurations.

24. The method of claim 21 , wherein at least one of the subsets of possible CSI-RS configurations corresponds to semi-persistent CSI-RS configurations.

25. A method for wireless communication at a user equipment (UE), comprising:

receiving from an access network entity a CSI-RS configuration associated with a first partial band within a total configured bandwidth of the UE;

receiving downlink control information (DCI) from the access network entity, the DCI indicating a set of downlink resources associated with a second partial band within the total configured bandwidth of the UE; and

transmitting, to the access network entity, a partial CSI report, wherein there is a degree of overlap between frequency resources of the first partial band and frequency resources of the second partial band, and the partial CSI report comprises partial CSI-RS measurements taken over overlapping frequency resources of the first partial band and the second partial band.

26. The method of claim 25 , further comprising:

determining that a third partial band and a fourth partial band do not overlap; and

transmitting an error message based at least in part on the determining.

27. The method of claim 25 , further comprising:

determining a portion of the first partial band that overlaps with the second partial band; and

obtaining CSI-RS measurements over the portion of the first partial band that overlaps with the second partial band.

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

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:

receive from a access network entity a radio resource control (RRC) message indicating a set of two or more possible channel state information reference signals (CSI-RS) configurations for a partial band of a plurality of partial bands within a total configured bandwidth of the UE;

receive downlink control information (DCI) from the access network entity, the DCI indicating a set of downlink resources associated with a first partial band of the plurality of partial bands;

select a first CSI-RS configuration from the set of two or more possible CSI-RS configurations for the first partial band based at least in part on the DCI; and

obtain CSI measurements over the set of downlink resources in the first partial band using the selected first CSI-RS configuration.