Channel state information for enhanced carrier aggregation

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

identifying, by the UE, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers (CCs) from a set of component carriers in a carrier aggregation configuration of the UE;

determining, by the UE, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include a CSI parameter for a reference component carrier and delta values based on the CSI parameter for the reference component carrier;

generating, by the UE, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and

transmitting, by the UE, one or more of the combined reports.

2. The method of claim 1 , further comprising:

determining a reference component carrier for each of the CSI reporting groups; and

identifying a CSI parameter for each reference component carrier.

3. The method of claim 1 , wherein each component carrier from the set of component carriers is associated with a CSI reporting group of the plurality of CSI reporting groups.

4. The method of claim 1 , wherein generating the combined report for each of the plurality of CSI reporting groups comprises:

multiplexing a plurality of CSI reports corresponding to the plurality of component carriers in the CSI reporting group, wherein each CSI report in the plurality of CSI reports is based at least part on an individual physical uplink control channel (PUCCH) format.

5. The method of claim 4 , wherein the transmitting further comprises:

transmitting hybrid automatic repeat request (HARQ) feedback with a first combined report on a first uplink (UL) control channel of a first UL component carrier; and

transmitting remaining combined reports on a second UL control channel of a second UL component carrier.

6. The method of claim 1 , wherein transmitting the one or more of the combined reports comprises:

transmitting the one or more combined reports on a physical uplink shared channel (PUSCH) according to a semi-persistent scheduling configuration of the UE.

7. The method of claim 6 , wherein at least one of the combined reports comprises at least one of HARQ feedback or a scheduling request (SR), or both.

8. The method of claim 7 , further comprising:

sending an indication that the at least one of the combined reports comprises HARQ feedback.

9. The method of claim 7 , wherein the one or more combined reports are jointly coded.

10. The method of claim 6 , further comprising:

transmitting data using remaining resources of the PUSCH according to the semi-persistent scheduling configuration of the UE.

11. The method of claim 1 , wherein each of the CSI reporting configurations comprises a CSI reporting periodicity, and wherein transmitting the one or more combined reports comprises:

transmitting the one or more combined reports based at least in part on the CSI reporting periodicity.

12. The method of claim 1 , further comprising:

identifying a collision between two or more of the combined reports; and

refraining from transmitting at least one of the two or more combined reports based at least in part on a prioritization scheme and when the collision is identified.

13. The method of claim 12 , wherein the prioritization scheme is based at least in part on a set of reporting types, and wherein each component carrier of the plurality of component carriers in each CSI reporting group has a same reporting type.

14. The method of claim 13 , wherein the prioritization scheme is further based at least in part on a lowest serving cell index.

15. An apparatus for wireless communication, comprising:

means for identifying, by the apparatus, a carrier aggregation configuration comprising a set of component carriers (CCs);

means for identifying, by the apparatus, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers from the set of component carriers in the carrier aggregation configuration;

means for determining, by the apparatus, a reference component carrier for each of the CSI reporting groups;

means for identifying, by the apparatus, a CSI parameter for each reference component carrier;

means for determining, by the apparatus, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include the CSI parameter for the reference component carrier and delta values based on the CSI parameter for the reference component carrier;

means for generating, by the apparatus, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and

means for transmitting, by the apparatus, one or more of the combined reports.

16. An apparatus for wireless communication, comprising:

at least one processor;

memory in electronic communication with the at least one processor; and

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

identify, by the apparatus, a carrier aggregation configuration comprising a set of component carriers (CCs);

identify, by the apparatus, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers from the set of component carriers in the carrier aggregation configuration;

determine, by the apparatus, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include a CSI parameter for a reference component carrier and delta values based on the CSI parameter for the reference component carrier;

generate, by the apparatus, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and

transmit, by the apparatus, one or more of the combined reports.

17. The apparatus of claim 16 , wherein the instructions are operable to cause the apparatus to:

select a reference component carrier for each of the CSI reporting groups; and

identify a CSI parameter for each of the reference component carriers.

18. The apparatus of claim 16 , wherein the instructions are operable to cause the apparatus to:

multiplex a plurality of CSI reports corresponding to the plurality of component carriers in the CSI reporting group, wherein each CSI report in the plurality of CSI reports is based at least part on an individual physical uplink control channel (PUCCH) format.

19. The apparatus of claim 18 , wherein the instructions are operable to cause the apparatus to:

transmit the one or more of the combined reports on a first uplink (UL) control channel; and

transmit remaining combined reports on a second UL control channel on a different component carrier (CC) than the first UL control channel.

20. The apparatus of claim 16 , wherein the instructions are operable to cause the apparatus to:

transmit the one or more of the combined reports on a physical uplink shared channel (PUSCH) according to a semi-persistent scheduling configuration.

21. The apparatus of claim 20 , wherein the instructions are operable to cause the apparatus to:

transmit data using remaining resources of the PUSCH according to the semi-persistent scheduling configuration.

22. The apparatus of claim 16 , wherein each of the CSI reporting configurations comprises a CSI reporting periodicity, and wherein the instructions are operable to cause the apparatus to:

transmit the one or more combined reports based at least in part on the CSI reporting periodicity.

23. The apparatus of claim 16 , wherein the instructions are operable to cause the apparatus to:

identify a collision between two or more of the combined reports; and

refrain from transmitting at least one of the two or more combined reports based at least in part on a prioritization scheme and the identified collision.