Node in wireless communication system and method performed by the same

A method performed by a user equipment (UE) in a communication system, the method comprising:

• receiving, from a central unit (CU) of a source base station, a radio resource control (RRC) reconfiguration message including configuration information for a target cell;
• receiving, from a distributed unit (DU) of the source base station, a handover command message;
• and
• as a response to the handover command message, accessing to a DU of a target base station.

A central unit (CU) of a source base station in a communication system, the CU of the source base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• transmit, to at least one CU of a candidate target base station, a layer 1/layer 2 (L1/L2)-triggered mobility (LTM) handover request for triggering an LTM handover,
• receive, from the at least one CU of the candidate target base station, an LTM handover request result message including at least one an identification (ID) of an accepted target cell, information for the accepted target cell or a reason for a non-accepted target cell, and
• as a response to the LTM handover request result message, transmit, to a user equipment (UE), a first radio resource control (RRC) reconfiguration message including configuration information for a target cell.

A central unit (CU) of a target base station in a communication system, the CU of the target base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• receive, from a CU of a source base station, a layer 1/layer 2 (L1/L2)-triggered mobility (LTM) handover request for triggering an LTM handover,
• transmit, to the CU of the source base station, an LTM handover request result message,
• wherein the LTM handover request result message includes at least one an identification (ID) of an accepted target cell, information for the accepted target cell or a reason for a non-accepted target cell.

A user equipment (UE) in a communication system, the UE comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• receive, from a central unit (CU) of a source base station, a radio resource control (RRC) reconfiguration message including configuration information for a target cell,
• receive, from a distributed unit (DU) of the source base station, a handover command message, and
• as a response to the handover command message, access to a DU of a target base station.