The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein disclose methods for performing LTM. The method includes: receiving a LTM configuration in a RRC message indicating whether the UE needs to perform one of: a RLC reestablishment and a PDCP recovery during the LTM to a candidate cell; receiving one of a DL MAC CE or a DL L1 message used for triggering the LTM; performing a MAC operation comprising one of a complete MAC reset and a partial MAC reset; transmitting at least one uplink RRC message, wherein at least one uplink RRC message was transmitted within a specificized time interval before receiving the DL MAC CE or the DL L1 message; and performing at least one of the RLC reestablishment and the PDCP recovery based on the received indication.