Timing advance determination by target base station for rach-less handover

A base station comprising:

• a receiver configured to:
• receive user equipment (UE) device radio transmission configuration information associated with a UE device, the UE device being served by another base station, and
• receive, from the UE device, a first transmission using a UE device radio transmission configuration associated with the UE device radio transmission configuration information;
• and
• a controller coupled to the receiver, the controller configured to:
• determine a timing difference between the base station and the UE device, based at least partially on the received first transmission, and
• cooperate with a handover of the UE device from the another base station to the base station, the handover initiated by the another base station after the timing difference has been determined.

A system comprising:

• a user equipment (UE) device;
• a source base station serving the UE device, the source base station comprising:
• a transmitter configured to transmit UE device radio transmission configuration information associated with the UE device, and
• a controller configured to initiate a handover of the UE device from the source base station to the target base station;
• and
• a target base station comprising:
• a receiver configured to:
• receive the UE device radio transmission configuration information, and
• receive, from the UE device, a first transmission using a UE device radio transmission configuration associated with the UE device radio transmission configuration information, and
• a controller coupled to the receiver, the controller configured to:
• determine a timing difference between the target base station and the UE device, based at least partially on the received first transmission, and
• cooperate with the handover of the UE device from the source base station to the target base station, the handover initiated by the source base station after the timing difference has been determined.