Sounding reference signals with collisions in asymmetric carrier aggregation

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

receiving a carrier aggregation configuration for a first component carrier (CC) as a secondary cell, the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;

determining that a sounding reference signal (SRS) transmission in an uplink portion of the first CC would at least partially overlap in time with an uplink transmission on a second CC;

adjusting the uplink transmission or the SRS transmission based on the determination and an interruption time of the UE to transmit the SRS in the uplink portion of the first CC,

wherein the interruption time is based at least in part on a capability of the UE for switching between transmissions on different CCs, and

wherein adjusting the uplink transmission or the SRS transmission includes applying at least one prioritization rule to determine whether to drop the SRS transmission or the uplink transmission; and

performing at least one of transmitting the uplink transmission on the second CC or transmitting the SRS in the uplink portion of the first CC.

2. The method of claim 1 , wherein the at least one prioritization rule is based on a type of the SRS transmission.

3. The method of claim 2 , wherein the at least one prioritization rule is based on the SRS being an aperiodic SRS or a periodic SRS.

4. The method of claim 1 , wherein the at least one prioritization rule is based on a type of information comprised in the uplink transmission on the second CC.

5. The method of claim 4 , wherein the at least one prioritization rule is based on the type of information being at least one of a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR), or channel state information (CSI).

6. The method of claim 5 , wherein the at least one prioritization rule is further based on a type of the CSI comprised in the uplink transmission.

7. The method of claim 1 , wherein the adjusting comprises dropping the SRS transmission on the first CC when the type of information comprised in the uplink transmission on the second CC is a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR), or a channel state information (CSI).

8. The method of claim 1 , wherein the at least one prioritization rule is based on a channel type of the uplink transmission on the second CC.

9. The method of claim 8 , wherein the at least one prioritization rule is based on the uplink transmission comprising a physical random access channel (PRACH) transmission, a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission.

10. The method of claim 9 , wherein the at least one prioritization rule indicates for the UE to drop the SRS transmission when the uplink transmission comprises the PUSCH transmission or the PUCCH transmission carrying at least one of the PRACH transmission, a hybrid automatic repeat request acknowledgment (HARQ-ACK), or a scheduling request (SR).

11. The method of claim 1 , wherein the at least one prioritization rule indicates for the UE to drop the SRS transmission based on the uplink transmission comprising channel state information (CSI).

12. The method of claim 1 , wherein the UE transmits the SRS in the uplink portion of the first CC based on the at least one prioritization rule.

13. The method of claim 1 , wherein the capability of the UE for switching between transmissions on different CCs comprises a retuning time of the UE.

14. The method of claim 13 , wherein the retuning time of the UE is associated with frequency bands of the different CCs.

15. The method of claim 1 , wherein the SRS transmission overlaps with the uplink transmission of the second CC in at least one symbol.

16. The method of claim 1 , wherein the adjusting further comprises determining whether simultaneous transmissions on a number of CCs of the carrier aggregation configuration would exceed an uplink transmit capability of the UE.

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

a memory; and

at least one processor coupled to the memory and configured to:

receive a carrier aggregation configuration for a first component carrier (CC) as a secondary cell, the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;

determine that a sounding reference signal (SRS) transmission in an uplink portion of the first CC would at least partially overlap in time with an uplink transmission on a second CC;

adjust the uplink transmission or the SRS transmission based on the determination and an interruption time of the UE to transmit the SRS in the uplink portion of the first CC,

wherein the interruption time is based at least in part on a capability of the UE for switching between transmissions on different CCs, and

wherein adjusting the uplink transmission or the SRS transmission includes applying at least one prioritization rule to determine whether to drop the SRS transmission or the uplink transmission; and

perform at least one of transmitting the uplink transmission on the second CC or transmitting the SRS in the uplink portion of the first CC.

18. The apparatus of claim 17 , wherein the at least one prioritization rule is based on a type of the SRS transmission.

19. The apparatus of claim 18 , wherein the at least one prioritization rule is based on the SRS being an aperiodic SRS or a periodic SRS.

20. The apparatus of claim 17 , wherein the at least one prioritization rule is based on a type of information comprised in the uplink transmission on the second CC.

21. The apparatus of claim 20 , wherein the at least one prioritization rule is based on the type of information being at least one of a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR), or channel state information (CSI).

22. The apparatus of claim 21 , wherein the at least one prioritization rule is further based on a type of the CSI comprised in the uplink transmission.

23. The apparatus of claim 17 , wherein the at least one prioritization rule is based on a channel type of the uplink transmission on the second CC.

24. The apparatus of claim 23 , wherein the at least one prioritization rule is based on the uplink transmission comprising a physical random access channel (PRACH) transmission, a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission.

25. The apparatus of claim 17 , wherein the at least one prioritization rule indicates for the apparatus to drop the SRS transmission when the uplink transmission comprises at least one of a physical random access channel (PRACH) transmission, a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR).

26. The apparatus of claim 17 , wherein the at least one prioritization rule indicates for the apparatus to drop the SRS transmission based on the uplink transmission comprising channel state information (CSI).

27. The apparatus of claim 17 , wherein the apparatus is configured to transmit the SRS in the uplink portion of the first CC based on the at least one prioritization rule.

28. The apparatus of claim 17 , wherein the capability of the UE for switching between transmissions on different CCs comprises a retuning time of the UE.

29. The apparatus of claim 28 , wherein the retuning time of the UE is associated with frequency bands of the different CCs.

30. The apparatus of claim 17 , wherein the apparatus is configured to adjust the uplink transmission or the SRS transmission based further on a determination of whether simultaneous transmissions on a number of CCs of the carrier aggregation configuration would exceed an uplink transmit capability of the UE.

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

means for receiving a carrier aggregation configuration for a first component carrier (CC) as a secondary cell, the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;

means for determining that a sounding reference signal (SRS) transmission in an uplink portion of the first CC would at least partially overlap in time with an uplink transmission on a second CC;

means for adjusting the uplink transmission or the SRS transmission based on the determination and an interruption time of the UE to transmit the SRS in the uplink portion of the first CC,

wherein the interruption time is based at least in part on a capability of the UE for switching between transmissions on different CCs, and

wherein the means for adjusting the uplink transmission or the SRS transmission are configured to apply at least one prioritization rule to determine whether to drop the SRS transmission or the uplink transmission; and

means for performing at least one of transmitting the uplink transmission on the second CC or transmitting the SRS in the uplink portion of the first CC.

32. A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to:

receive a carrier aggregation configuration for a first component carrier (CC) as a secondary cell, the first CC being a time division duplex (TDD) CC, the carrier aggregation configuration including downlink portions and excluding uplink portions of the first CC for data transmission by the UE;

determine that a sounding reference signal (SRS) transmission in an uplink portion of the first CC would at least partially overlap in time with an uplink transmission on a second CC;

adjust the uplink transmission or the SRS transmission based on the determination and an interruption time of the UE to transmit the SRS in the uplink portion of the first CC,

wherein the interruption time is based at least in part on a capability of the UE for switching between transmissions on different CCs, and

wherein adjusting the uplink transmission or the SRS transmission includes applying at least one prioritization rule to determine whether to drop the SRS transmission or the uplink transmission; and

perform at least one of transmitting the uplink transmission on the second CC or transmitting the SRS in the uplink portion of the first CC.