Physical uplink control channel (PUCCH) repetition across multiple component carriers

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

receiving, from a base station, a repetition configuration indicating a number of repetitions of a physical uplink control channel (PUCCH) transmission including at least a first repetition and a second repetition;

transmitting, to the base station, the first repetition of the PUCCH transmission in a first slot on a first component carrier, of a group of component carriers that includes a primary component carrier and one or more secondary components carriers, based on receiving the repetition configuration, the UE being configured to communicate via the primary component carrier and the one or more secondary component carriers; and

transmitting, to the base station, the second repetition of the PUCCH transmission on only one of the first component carrier or a second component carrier, of the group of component carriers, having an earliest slot, after the first slot, that is available to carry the second repetition, the second repetition being transmitted in the earliest slot.

2. The method of claim 1 , further comprising receiving a slot index from the base station, wherein the first repetition of the PUCCH transmission is transmitted in the first slot on the first component carrier, based on the slot index.

3. The method of claim 1 , wherein a number of available uplink orthogonal frequency division multiplexed (OFDM) symbols in the first candidate slot satisfies an availability condition, the number of available uplink OFDM symbols satisfying the availability condition based on the number of available uplink OFDM symbols being sufficient to transmit the second repetition of the PUCCH transmission.

4. The method of claim 3 , wherein the second component carrier is associated with a component carrier index that is largest among all candidate component carriers in the group of component carriers having the number of available uplink OFDM symbols satisfying the availability condition.

5. The method of claim 3 , wherein the second component carrier is associated with a component carrier index that is smallest among all candidate component carriers in the group of component carriers having the number of available uplink OFDM symbols satisfying the availability condition.

6. The method of claim 1 , wherein the second component carrier has a same numerology as the first component carrier.

7. The method of claim 1 , wherein the first component carrier has a different numerology than the second component carrier, and the method further comprises determining a slot boundary and a slot index for the second component carrier based on a reference component carrier.

8. The method of claim 7 , wherein the reference component carrier is a primary component carrier.

9. The method of claim 7 , wherein the reference component carrier is a component carrier with a smallest sub carrier spacing among all component carriers in the group of component carriers.

10. The method of claim 7 , wherein:

the second repetition of the PUCCH transmission is transmitted in the first candidate slot on the second component carrier;

the first candidate slot is an earliest slot of multiple physical slots of the second component carrier; and

the first candidate slot aligns with a designated slot of the reference component carrier.

11. The method of claim 1 , further comprising receiving, from the base station, a radio resource control (RRC) parameter that configures a PUCCH carrier switch at the UE.

12. An apparatus for wireless communications at a user equipment (UE), comprising:

one or more processors;

one or more memories coupled with the one or more processors; and

instructions stored in the one or more memories and operable, when executed by the one or more processors, to cause the apparatus to:

receive, from a base station, a repetition configuration indicating a number of repetitions of a physical uplink control channel (PUCCH) transmission including at least a first repetition and a second repetition;

transmit, to the base station, the first repetition of the PUCCH transmission in a first slot on a first component carrier, of a group of component carriers that includes a primary component carrier and one or more secondary components carriers, based on receiving the repetition configuration, the UE being configured to communicate via the primary component carrier and the one or more secondary component carriers; and

transmit, to the base station, the second repetition of the PUCCH transmission on only one of the first component carrier or a second component carrier, of the group of component carriers, having an earliest slot, after the first slot, that is available to carry the second repetition, the second repetition being transmitted in the earliest slot.

13. The apparatus of claim 12 , wherein execution of the instructions further cause the apparatus to receive a slot index from the base station, wherein the first repetition of the PUCCH transmission is transmitted in the first slot on the first component carrier, based on the slot index.

14. The apparatus of claim 12 , wherein a number of available uplink orthogonal frequency division multiplexed (OFDM) symbols in the first candidate slot satisfies an availability condition, the number of available uplink OFDM symbols satisfying the availability condition based on the number of available uplink OFDM symbols being sufficient to transmit the second repetition of the PUCCH transmission.

15. The apparatus of claim 14 , wherein the second component carrier is associated with a component carrier index that is largest or smallest among all candidate component carriers in the group of component carriers having the number of available uplink OFDM symbols satisfying the availability condition.

16. The apparatus of claim 12 , wherein execution of the instructions further cause the apparatus to receive, from the base station, a radio resource control (RRC) parameter that configures a PUCCH carrier switch at the UE.

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

receiving, from a base station, a repetition configuration indicating a number of repetitions of a physical uplink control channel (PUCCH) transmission including at least a first repetition;

receiving, from the base station based on the number of repetitions satisfying a repetition criterion, a component carrier parameter indicating a component carrier, of a group of component carriers that includes a primary component carrier and one or more secondary components carriers, to use for the first repetition of the PUCCH transmission, the UE being configured to communicate via the primary component carrier and the one or more secondary component carriers; and

transmitting, to the base station, the first repetition of the PUCCH transmission on a first component carrier, of the group of component carriers, based on the number of repetitions indicated in the repetition configuration, the first component carrier corresponding to the component carrier indicated in the component carrier parameter based on the number of repetitions satisfying the repetition criterion.

18. The method of claim 17 , wherein the number of repetitions satisfies the repetition criterion based on the number of repetitions being equal to one.

19. The method of claim 17 , wherein the first component carrier is the primary component carrier based on the component carrier parameter indicating the primary component carrier and the number of repetitions being equal to one.

20. The method of claim 17 , wherein the first component carrier is a secondary component carriers of the one or more secondary component carriers based on the component carrier parameter indicating the secondary component carrier and the number of repetitions being equal to one.

21. The method of claim 17 , wherein the first component carrier is the primary component carrier based on the number of repetitions being greater than one.

22. The method of claim 21 , further comprising transmitting each respective repetition of the number of repetitions, after the first repetition, on the primary component carrier.

23. The method of claim 17 , further comprising receiving, from the base station, a radio resource control (RRC) parameter that configures a PUCCH carrier switch at the UE.

24. An apparatus for wireless communications at a user equipment (UE), comprising:

one or more processors;

a one or more memories coupled with the one or more processors; and

instructions stored in the one or more memories and operable, when executed by the one or more processors, to cause the apparatus to:

receive, from a base station, a repetition configuration indicating a number of repetitions of a physical uplink control channel (PUCCH) transmission including at least a first repetition;

receive, from the base station based on the number of repetitions satisfying a repetition criterion, a component carrier parameter indicating a component carrier, of a group of component carriers that includes a primary component carrier and one or more secondary components carriers, to use for the first repetition of the PUCCH transmission, the UE being configured to communicate via the primary component carrier and the one or more secondary component carriers; and

transmit, to the base station, the first repetition of the PUCCH transmission on a first component carrier, of the group of component carriers, based on the number of repetitions indicated in the repetition configuration, the first component carrier corresponding to the component carrier indicated in the component carrier parameter based on the number of repetitions satisfying the repetition criterion.

25. The apparatus of claim 24 , wherein the number of repetitions satisfies the repetition criterion based on the number of repetitions being equal to one.

26. The apparatus of claim 24 , wherein the first component carrier is the primary component carrier based on the component carrier parameter indicating the primary component carrier and the number of repetitions being equal to one.

27. The apparatus of claim 24 , wherein the first component carrier is a secondary component carrier of the one or more secondary component carriers based on the component carrier parameter indicating the secondary component carrier and the number of repetitions being equal to one.

28. The apparatus of claim 24 , wherein the first component carrier is the primary component carrier based on the number of repetitions being greater than one.

29. The apparatus of claim 28 , wherein execution of the instructions further cause the apparatus to transmit each respective repetition of the number of repetitions, after the first repetition, on the primary component carrier.

30. The apparatus of claim 24 , wherein execution of the instructions further cause the apparatus to receive, from the base station, a radio resource control (RRC) parameter that configures a PUCCH carrier switch at the UE.