Candidate cell timing advance group management in conditional lower-layer triggered mobility

A serving cell, 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 serving cell to:
• output, to a user equipment (UE), control signaling indicating a candidate cell timing advance group comprising a plurality of candidate cells;
• output, to the UE, a downlink control message comprising a command to initiate access with a candidate cell of the plurality of candidate cells of the candidate cell timing advance group;
• obtain, from the candidate cell of the candidate cell timing advance group, a report comprising an indication of a common timing advance;
• and
• output, to the UE, the common timing advance associated with the candidate cell timing advance group based at least in part on obtaining the report.

A method for wireless communications at a user equipment (UE), comprising:

• receiving, from a serving cell, control signaling indicating a candidate cell timing advance group comprising a plurality of candidate cells;
• receiving, from the serving cell, a downlink control message comprising a command to initiate access with a candidate cell of the plurality of candidate cells of the candidate cell timing advance group;
• transmitting, to the candidate cell, a random access channel message based at least in part on the command to initiate access with the candidate cell;
• obtaining a common timing advance associated with the candidate cell timing advance group based at least in part on transmitting the random access channel message;
• and
• communicating with at least one candidate cell of the plurality of candidate cells of the candidate cell timing advance group based at least in part on the common timing advance.