Method and apparatus for performing handover using packet data convergence protocol (PDCP) reordering in mobile communication system

摘要

A method for transmitting data, the method comprising the steps of: receiving a PDCP Packet from a source evolved Node B (eNB), with the exception of PDCP Packets of which reception was acknowledged based on consecutively associated Sequence Numbers (SNs) from a User Equipment (UE); receiving a PDCP Packet from an upper node; and transmitting said PDCP Packet from the source eNB and the PDCP Packet from the upper node. 505 510 515 UE SOURCE ENB TARGET ENB (PDCP/RLC) (RLC) (RLC) PDCP PDU [1, 2, 4, 6] RECEIVED -520 HO COMMAND (525) PDCP PDU [3, 4, 5, 6, 7, 8) RECEIVE DC PDUS 530 FORWARDING (527) DEUVERED TO THE PDCP WITH SPECIAL INDICATION PDCP BUFFERS OUT-OF SEQUENCE PDCP 535 POUS TEMPORARY HO COMPLETE (RECEIVED UPTO PDCP PDU [6], NOT RECEIVED: 3, 5) (540) ESTABLISHMENT V545 TRANSMISSION RESUME IN THE ORD R OF PDCP PDU [3, 5, 7, 8,...] (550) RLC PERFORMS IN-SEQUENCE DELIVERY 555 DEUVERY TO PDCP 560 WHEN PDCP PDU DELIVERY FROM NEW RLC STARTS, PDCP ASSUMES PDCP PDUS -565 UPTO THE PDCP PDU FROM THE NEW RLC ARE REORDERED