Method and apparatus for performing handover in wireless communication system

Abstract

A method, performed by a terminal, in a wireless communication system is provided. The method includes receiving, from a source base station, a radio resource control (RRC) reconfiguration message for a handover, the RRC reconfiguration message configuring a first data radio bearer (DRB) as a dual active protocol stack (DAPS) bearer and a second DRB as a non-DAPS bearer, for the first DRB, in case that an uplink data switching is requested from an upper layer, indicating, by a packet data convergence protocol (PDCP) entity for the DRB, a PDCP data volume excluding a PDCP Control protocol data unit (PDU) associated with the source base station, to a medium access control (MAC) entity for a target base station, and for the second DRB, in case that an indication of PDCP re-establishment is set, performing a PDCP re-establishment for the second DRB.

Dependencies are inferred from the claim text.