Serving-cell-to-candidate-cell timing advance group mapping

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

• receiving, from a serving cell belonging to a first timing advance group (TAG), a control message that configures a candidate cell, information identifying a second TAG to which the candidate cell belongs, and mapping information that identifies a mapping between the first TAG and the second TAG;
• and
• transmitting, to the candidate cell, a random access message as part of a handover between the serving cell and the candidate cell using the mapping information.

An apparatus for wireless communication, comprising:

• means for receiving, from a serving cell belonging to a first timing advance group (TAG), a control message that configures a candidate cell, information identifying a second TAG to which the candidate cell belongs, and mapping information that identifies a mapping between the first TAG and the second TAG;
• and
• means transmitting, to the candidate cell, a random access message as part of a handover between the serving cell and the candidate cell using the mapping information.