Method and apparatus for performing mobility related to dual connectivity in wireless communication system

A wireless device in a wireless communication system comprising:

• a transceiver;
• a memory;
• and
• at least one processor operatively coupled to the transceiver and the memory, and configured to:
• control the transceiver to receive a first message comprising secondary node (SN) mobility commands of candidate target primary secondary cells (PScells), each of the SN mobility commands being related to an index,
• control the transceiver to receive a second message comprising the index related to a first SN mobility command of a candidate target PScell among the SN mobility commands, and a second SN mobility command of the candidate target PScell,
• update the first SN mobility command based on the SN second mobility command,
• identify that the candidate target PScell satisfies a SN mobility condition for the candidate target PScell based on a measurement result for the candidate target PScell, and
• perform a SN mobility to the candidate target PScell satisfying the SN mobility condition based on the updated first SN mobility command.

A computer-readable medium having recorded thereon a program for performing each step of a method on a computer, the method comprising:

• receiving a first message comprising secondary node (SN) mobility commands of candidate target primary secondary cells (PScells), each of the SN mobility commands being related to an index;
• receiving a second message comprising the index related to a first SN mobility command of a candidate target PScell among the SN mobility commands, and a second SN mobility command of the candidate target PScell;
• updating the first SN mobility command based on the SN second mobility command;
• identifying that the candidate target PScell satisfies a SN mobility condition for the candidate target PScell based on a measurement result for the candidate target PScell;
• and
• performing a SN mobility to the candidate target PScell satisfying the SN mobility condition based on the updated first SN mobility command.