Aperiod tracking reference signal

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

• a processor, memory in electronic communication with the processor;
• and instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, based at least in part on an occurrence of a triggering event associated with at least a secondary cell activation for the UE, a trigger signal that identifies resources to be used for transmission of an aperiodic tracking reference signal (TRS) and triggering the secondary cell activation for the UE;
• receive the aperiodic TRS based at least in part on the trigger signal and the identified resources;
• and
• perform at least one of a tracking function, or a synchronization function, or an alignment function, or a combination thereof, in response to the occurrence of the triggering event and based at least in part on the aperiodic TRS.

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

• means for receiving, based at least in part on an occurrence of a triggering event associated with at least a secondary cell activation for the UE, a trigger signal that identifies resources to be used for transmission of an aperiodic tracking reference signal (TRS) and triggering the secondary cell activation for the UE;
• means for receiving the aperiodic TRS based at least in part on the trigger signal and the identified resources;
• and
• means for performing at least one of a tracking function, or a synchronization function, or an alignment function, or a combination thereof, in response to the occurrence of the triggering event and based at least in part on the aperiodic TRS.

A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:

• receive, based at least in part on an occurrence of a triggering event associated with at least a secondary cell activation for the UE, a trigger signal that identifies resources to be used for transmission of an aperiodic tracking reference signal (TRS) and triggering the secondary cell activation for the UE;
• receive the aperiodic TRS based at least in part on the trigger signal and the identified resources;
• and
• perform at least one of a tracking function, or a synchronization function, or an alignment function, or a combination thereof, in response to the occurrence of the triggering event and based at least in part on the aperiodic TRS.