Patent ID: 8477719
Filing Date: 2013-07-02
Classification: H04W

Abstract:
1. A method of maintaining order of arrival for packet data convergence protocol (PDCP) service data units (SDUs) during a hand over from a source evolved Node B (eNB) to a target eNB comprising: assigning a packet data convergence protocol sequence number (PDCP SN) to a service data unit (SDU), the PDCP SN being offset to a General Packet Radio Services tunneling protocol sequence number (GTP-U SN) for the SDU by a predetermined offset value; supplying the predetermined offset value to the target eNB during the hand over; detecting drop of a further SDU at the source eNB before assignment of an associated PDCP SN to the further SDU at the source eNB; informing, by the source eNB, a user equipment (UE) of the drop of the further SDU; and discarding the associated PDCP SN at the source eNB.