User equipment performance in carrier aggregation scenarios

A user equipment (UE), comprising:

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
• receive control signaling indicating a carrier aggregation configuration for a set of component carriers for the UE, the set of component carriers including at least a primary carrier configured for frequency domain duplexed communications and a secondary carrier configured for time domain duplexed communications;
• transmit, while operating in a first tracking area according to a first antenna switching capability of the UE, a first message requesting to perform a tracking area update (TAU) procedure based at least in part on detecting that a performance metric associated with communications at the UE satisfies a threshold value, wherein the first antenna switching capability of the UE corresponds to a first quantity of receive antennas supported by the UE for communications via the secondary carrier, and wherein the first message indicates a tracking area identifier for the TAU procedure corresponding to the first tracking area;
• receive, in response to the first message, a request for the UE to indicate a capability of the UE;
• transmit, in response to the request, a second message indicating a second antenna switching capability of the UE based at least in part on adjusting the first antenna switching capability of the UE to the second antenna switching capability of the UE, the second antenna switching capability of the UE corresponding to a second quantity of receive antennas supported by the UE for communications via the secondary carrier, wherein the second quantity of receive antennas is less than the first quantity of receive antennas;
• and
• communicating, via the secondary carrier, one or more sounding reference signal (SRS) transmissions in accordance with the second quantity of receive antennas.

A user equipment (UE), comprising:

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
• receive control signaling indicating a carrier aggregation configuration for a set of component carriers, the set of component carriers including at least a first carrier configured as a primary cell and a second carrier configured as a secondary cell, wherein the first carrier is configured for frequency domain duplexed communications and the second carrier is configured for time domain duplexed communications;
• transmit a measurement report based at least in part on detecting that a performance metric associated with communications at the UE satisfies a first threshold value and that a difference value between a first signal strength measurement for the primary cell and a second signal strength measurement for the secondary cell satisfies a second threshold value, the measurement report including a first value corresponding to the first signal strength measurement and a second value corresponding to the second signal strength measurement plus an offset value;
• receive control signaling triggering a handover procedure to switch the primary cell to be associated with the second carrier and the secondary cell to be associated with the first carrier based at least in part on the measurement report including the second value corresponding to the second signal strength measurement plus the offset value;
• and
• communicate one or more sounding reference signal (SRS) transmissions via the second carrier based at least in part on performing the handover procedure.

A method for wireless communication by a user equipment (UE), comprising:

• receiving control signaling indicating a carrier aggregation configuration for a set of component carriers, the set of component carriers including at least a primary carrier configured for frequency domain duplexed communications and a secondary carrier configured for time domain duplexed communications;
• monitoring one or more performance metrics associated with communications at the UE;
• transmitting a UE assistance information message indicating a request to modify a configured periodicity of sounding reference signal (SRS) transmissions by the UE via the secondary carrier based at least in part on detecting that a performance metric of the one or more performance metrics satisfying a threshold value;
• and
• communicating, via the secondary carrier, one or more SRS transmissions according to a periodicity that is updated based at least in part on transmitting the UE assistance information message.