Method and device for performing handover in communication system

A terminal in a communication system, the terminal comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive a signal from a primary cell by using a first radio frequency (RF) chain and receive a signal from a secondary cell by using at least one RF chain among a plurality of RF chains,
• receive, from the primary cell, a message for a handover, the message including an indicator indicating whether the plurality of RF chains are available for the handover,
• as a response to reception of the message, deactivate the secondary cell,
• in case that the indicator indicates that the plurality of RF chains are available for the handover, identify a second RF chain supporting a frequency of a target cell among the plurality of RF chains,
• perform a synchronization with the target cell by using the second RF chain while transmitting and receiving a signal to and from the primary cell by using the first RF chain, and
• receive, from the target cell, a signal by using the second RF chain after performing the synchronization.