The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) is provided. The method includes transmitting, to a base station, a first message including information that a successful primary secondary cell (PSCell) report is available; receiving, from the base station, a second message requesting for the successful PSCell report; and transmitting, to the base station, a third message including the successful PSCell report.