Periodic channel state information reporting for enhanced carrier aggregation

1. A method of wireless communication, comprising:

detecting, by a mobile device, a size of a hybrid automatic repeat request (HARQ) payload for reporting, in a subframe, HARQ feedback associated with transmissions on a plurality of component carriers (CCs);

determining, by the mobile device, that at least one of a scheduling request (SR), a periodic channel state information (P-CSI) report, or a combination thereof is to be included in the subframe;

selecting, by the mobile device, a physical uplink control channel (PUCCH) format from a set of PUCCH formats based at least in part on a comparison of a size of an uplink control message with a threshold, wherein the uplink control message comprises the HARQ payload and a payload for at least one of the SR or the P-CSI report; and

transmitting, by the mobile device, the uplink control message in the subframe using the selected PUCCH format.

2. The method of claim 1 , wherein the set of PUCCH formats comprises a first set of PUCCH formats associated with reporting HARQ feedback for one CC, a second set of PUCCH formats associated with reporting HARQ feedback for up to five CCs, or a third set of PUCCH formats associated with reporting HARQ feedback for more than five CCs.

3. The method of claim 1 , wherein when the size of the uplink control message is greater than the threshold, selecting the PUCCH format comprises selecting, by the mobile device, a PUCCH format having a greater capacity than at least one other PUCCH format from the set of PUCCH formats.

4. The method of claim 3 , wherein the threshold has a size of 22 bits.

5. The method of claim 1 , further comprising:

multiplexing the HARQ payload with P-CSI reports for two or more CCs configured for the UE, wherein determining that at least one of an SR or a P-CSI report is to be included in the subframe comprises identifying the P-CSI reports for the two or more CCs configured for the UE.

6. The method of claim 1 , wherein the SR is determined to be present and the uplink control message comprises the HARQ payload and a payload for the SR.

7. The method of claim 1 , wherein the SR and the P-CSI report are determined to be present and the uplink control message comprises the HARQ payload, a payload for the SR, and a payload for the P-CSI report.

8. The method of claim 1 , wherein the P-CSI report comprises a report from at least one P-CSI process from a plurality of P-CSI processes for a CC configured for the UE, a report from a P-CSI process for at least one P-CSI subframe set from a plurality of P-CSI subframe sets for a CC configured for the UE, or a combination thereof.

9. The method of claim 1 , wherein determining that at least one of the SR or the P-CSI report is to be included in the subframe comprises:

determining to report a subset of P-CSI reports from a set of P-CSI reports.

10. The method of claim 9 , wherein determining to report a subset of P-CSI reports from a set of P-CSI reports comprises:

prioritizing P-CSI reports based on P-CSI report types, the prioritizing performed within a CC configured for the UE, or across CCs configured for the UE, or a combination thereof.

11. The method of claim 9 , wherein determining to report a subset of P-CSI reports from a set of P-CSI reports comprises:

prioritizing based on P-CSI report types, followed by prioritizing based on a CSI process identification, followed by prioritizing based on a CC index, followed by prioritizing based on a subframe set index.

12. The method of claim 1 , further comprising:

receiving signaling indicative of the size of the HARQ payload from a network node.

13. The method of claim 1 , further comprising:

receiving signaling indicative of whether to consider a presence of the at least one of the SR or the P-CSI report in the selection of the PUCCH format.

14. The method of claim 1 , wherein the set of PUCCH formats comprises a first PUCCH format associated with P-CSI reporting for one CC and a second PUCCH format associated with P-CSI reporting for two or more CCs.

15. The method of claim 1 , wherein the uplink control message is associated with a cell group among a plurality of cell groups.

16. A method of wireless communication, comprising:

receiving a configuration supporting transmission of a plurality of periodic channel state information (P-CSI) reports during a same transmission time interval (TTI), wherein the plurality of P-CSI reports are associated with two or more of P-CSI reports for a plurality of subframe sets of a channel state information (CSI) process, P-CSI reports for a plurality of CSI processes of a component carrier (CC), or P-CSI reports for a plurality of CCs of a carrier aggregation (CA) configuration;

determining that two or more P-CSI reports are due for transmission during the TTI; and

transmitting at least one of the two or more P-CSI reports during the TTI according to a prioritization rule, wherein the prioritization rule is based at least in part on a payload capacity of a physical uplink control channel (PUCCH) format or payload sizes of the two or more P-CSI reports.

17. The method of claim 16 , wherein the configuration supporting transmission of the plurality of P-CSI reports comprises at least one of a coordinated multipoint (CoMP) configuration, a CA configuration with one or more PUCCH groups, a dual-connectivity configuration, or an interference mitigation and traffic adaptation (IMTA) configuration.

18. The method of claim 16 , wherein the prioritization rule comprises prioritizing by a CSI type, followed by a CSI process identification (ID), followed by a CC index, followed by a subframe set index.

19. The method of claim 16 , wherein the CA configuration comprises a configuration of more than five CCs.

20. A mobile device, 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 mobile device to:

detect a size of a hybrid automatic repeat request (HARQ) payload for reporting, in a subframe, HARQ feedback associated with transmissions on a plurality of component carriers (CCs);

determine that at least one of a scheduling request (SR), a periodic channel state information (P-CSI) report, or a combination thereof is to be included in the subframe;

select a physical uplink control channel (PUCCH) format from a set of PUCCH formats based at least in part on a comparison of a size of an uplink control message with a threshold, wherein the uplink control message comprises the HARQ payload and a payload for at least one of the SR or the P-CSI report; and

transmit the uplink control message in the subframe using the selected PUCCH format.

21. The mobile device of claim 20 , wherein when the size of the uplink control message is greater than the threshold, the instructions to select the PUCCH format are operable to cause the mobile device to select a PUCCH format having a greater capacity than at least one other PUCCH format from the set of PUCCH formats.

22. The mobile device of claim 20 , wherein the instructions are operable to cause the mobile device to:

multiplex the HARQ payload with P-CSI reports for two or more CCs configured for the UE, wherein determining that at least one of an SR or a P-CSI report is to be included in the subframe comprises identifying the P-CSI reports for the two or more CCs configured for the UE.

23. The mobile device of claim 20 , wherein the instructions are operable to cause the mobile device to:

receive signaling indicative of the size of the HARQ payload from a network node.

24. The mobile device of claim 20 , wherein the instructions are operable to cause the mobile device to:

receive signaling indicative of whether to consider a presence of the at least one of the SR or the P-CSI report in the selection of the PUCCH format.

25. The mobile device of claim 20 , wherein the uplink control message is associated with a cell group among a plurality of cell groups.

26. An mobile device for wireless communication, 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 mobile device to:

receive a configuration supporting transmission of a plurality of periodic channel state information (P-CSI) reports during a same transmission time interval (TTI), wherein the plurality of P-CSI reports are associated with two or more of P-CSI reports for a plurality of subframe sets of a channel state information (CSI) process, P-CSI reports for a plurality of CSI processes of a component carrier (CC), or P-CSI reports for a plurality of CCs of a carrier aggregation (CA) configuration;

determine that two or more P-CSI reports are due for transmission during the TTI; and

transmit at least one of the two or more P-CSI reports during the TTI according to a prioritization rule, wherein the prioritization rule is performed based at least in part on a payload capacity of a physical uplink control channel (PUCCH) format or payload sizes of the two or more P-CSI reports.

27. The mobile device of claim 26 , wherein the configuration supporting transmission of the plurality of P-CSI reports comprises at least one of a coordinated multipoint (CoMP) configuration, a CA configuration with one or more PUCCH groups, a dual-connectivity configuration, or an interference mitigation and traffic adaptation (IMTA) configuration.

28. The mobile device of claim 26 , wherein the prioritization rule comprises prioritizing a CSI type, followed by a CSI process identification (ID), followed by a CC index, followed by a subframe set index.

29. The mobile device of claim 20 , wherein the set of PUCCH formats comprises a first set of PUCCH formats associated with reporting HARQ feedback for one CC, a second set of PUCCH formats associated with reporting HARQ feedback for up to five CCs, or a third set of PUCCH formats associated with reporting HARQ feedback for more than five CCs.

30. The mobile device of claim 20 , wherein the instructions to determine that at least one of the SR or the P-CSI report is to be included in the subframe are operable to cause the mobile device to:

determine to report a subset of P-CSI reports from a set of P-CSI reports, wherein determining to report a subset of P-CSI reports from a set of P-CSI reports comprises prioritizing based on P-CSI report types, followed by prioritizing based on a CSI process identification, followed by prioritizing based on a CC index, followed by prioritizing based on a subframe set index.