METHOD AND APPARATUS FOR PERFORMING HANDOVER USING PACKET DATA CONVERGENCE PROTOCOL (PDCP) REORDERING IN MOBILE COMMUNICATION SYSTEM

摘要

Improving communication efficiency in handover re-establishing an ARQ entity in a mobile communication system is disclosed. The method includes transmitting first PDCP PDUs correctly received from the source cell, together with a special indication requiring reordering of the first PDCP PDUs, from a RLC receiving buffer to a PDCP receiving entity when a handover command message from a source cell to a target cell is received; buffering the first PDCP PDUs in a PDCP PDU reordering buffer by the PDCP receiving entity in response to the special indication; and when a second PDCP PDU is received from the target cell through a new RLC receiving entity for the target cell, outputting third PDCP PDUs up to a PDCP PDU before a first missing PDCP PDU having a sequence number higher than that of the second PDCP PDU from the PDCP reordering buffer.