Techniques for uplink performance optimization in dual carrier operation

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

communicating on an anchor carrier using a first antenna port of the UE;

communicating on a non-anchor carrier using a second antenna port of the UE;

determining to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; and

switching the non-anchor carrier from the second antenna port to the first antenna port based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

2. The method of claim 1 , further comprising:

switching the anchor carrier from the first antenna port to the second antenna port based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

3. The method of claim 1 , wherein determining to switch the non-anchor carrier from the second antenna port to the first antenna port comprises:

determining that the channel condition associated with the second antenna port satisfies a threshold for communicating using the anchor carrier, and

determining to switch the non-anchor carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port satisfies the threshold for communicating using the anchor carrier and based on one or more of the first power limit associated with the first antenna port or the second power limit associated with the second antenna port.

4. The method of claim 3 , wherein the threshold, for communicating using the anchor carrier, is associated with at least one of:

a block error rate associated with the second antenna port,

a received signal strength indicator associated with the second antenna port, or

a signal-to-noise ratio associated with the second antenna port.

5. The method of claim 1 , wherein determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with a switch of the non-anchor carrier from the second antenna port to the first antenna port.

6. The method of claim 5 , wherein the UE benefit is associated with at least one of increasing throughput or improving call sustainability.

7. The method of claim 1 , wherein determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations for the anchor carrier and information associated with resource allocations for the non-anchor carrier.

8. The method of claim 1 , further comprising:

determining, after the switching of the non-anchor carrier from the second antenna port to the first antenna port, whether to switch the non-anchor carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and

switching the non-anchor carrier from the first antenna port to the second antenna port based on determining to switch the non-anchor carrier from the first antenna port to the second antenna port.

9. The method of claim 8 , further comprising:

switching the anchor carrier from the second antenna port to the first antenna port based on determining to switch the non-anchor carrier from the first antenna port to the second antenna port.

10. The method of claim 8 , wherein determining to switch the non-anchor carrier from the first antenna port to the second antenna port based on the other channel condition comprises:

determining that the other channel condition associated with the second antenna port fails to satisfy a threshold for communicating using the anchor carrier, and

determining to switch the non-anchor carrier from the first antenna port to the second antenna port based on determining that the other channel condition associated with the second antenna port fails to satisfy the threshold for communicating using the anchor carrier.

11. The method of claim 8 , wherein determining to switch the non-anchor carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

12. The method of claim 8 , wherein determining to switch the non-anchor carrier from the first antenna port to the second antenna port is triggered based on a detection of an event.

13. The method of claim 1 , wherein the UE is operating in a dual connectivity (DC) mode, the anchor carrier associated with the DC mode, and the non- anchor carrier associated with the DC mode.

14. The method of claim 1 , wherein the anchor carrier is a Long Term Evolution (LTE) carrier and the non-anchor carrier is a New Radio (NR) carrier.

15. The method of claim 1 , wherein the UE is operating in a dual subscriber identity module (SIM) dual active mode.

16. A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors configured to:

communicate on an anchor carrier using a first antenna port of the UE;

communicate on a non-anchor carrier using a second antenna port of the UE;

determine to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; and

switch the non-anchor carrier from the second antenna port to the first antenna port based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

17. The UE of claim 16 , wherein the one or more processors are further configured to:

switch the anchor carrier from the first antenna port to the second antenna port based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

18. The UE of claim 16 , wherein the one or more processors, when determining to switch the non-anchor carrier from the second antenna port to the first antenna port, are to:

determine that the channel condition associated with the second antenna port satisfies a threshold for communicating using the anchor carrier, and

determine to switch the non-anchor carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port satisfies the threshold for communicating using the anchor carrier and based on one or more of the first power limit associated with the first antenna port or the second power limit associated with the second antenna port.

19. The UE of claim 16 , wherein determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations for the anchor carrier and information associated with resource allocations for the non-anchor carrier.

20. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:

communicate on an anchor carrier using a first antenna port of the UE;

communicate on a non-anchor carrier using a second antenna port of the UE;

determine to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; and

switch the non-anchor carrier from the second antenna port to the first antenna port based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

21. The UE of claim 16 , wherein the first power limit associated with the first antenna port is a maximum transmit power limit (MTPL) associated with the first antenna port.