Method for changing serving cell in wireless communication system and apparatus therefor

A User Equipment (UE) changing a serving cell in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit transmitting and receiving a radio signal;
• and
• a processor functionally connected to the RF unit,
• wherein the processor controls to
• transmit, to a serving cell, a measurement value for signals received from the serving cell and one or more cells,
• based on that the measurement value for a signal received from at least one cell among the one or more cells satisfies a predetermined specific multiple connection triggering condition and the at least one cell that satisfies the multiple connection triggering condition corresponds to a candidate cell, receive, from the serving cell, information representing that the at least one cell corresponds to the candidate cell for changing the serving cell, and
• receive, from the serving cell, a handover command to the at least one cell and perform synchronization for at least one of a downlink or an uplink with the at least one cell, by transmitting a specific uplink signal to the at least one cell based on that the at least one cell satisfies the multiple connection triggering condition related with handover and is not included in the candidate cell,
• receive, from the serving cell, information indicating the at least one cell to be configured as a new serving cell and perform a cell switching for changing the serving cell based on that the at least one cell satisfies the multiple connection triggering condition related with handover and is included in the candidate cell, and
• wherein the multiple connection triggering condition is related to reception power including Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), and
• wherein the synchronization is performed while maintaining a connection between the UE and the serving cell.