Method and eNodeB for forwarding downlink and uplink packets based on S1 handover

摘要

A method for forwarding downlink packets based on S1 handover is disclosed. The method includes: numbering a packet not processed by using PDCP according to a message that comprises PDCP Serial Number (SN) information if downlink packets to be forwarded include the packet not processed by using PDCP; and sending the downlink packets to the UE according to the PDCP SN corresponding to the packet included in the downlink packets. A method for forwarding uplink packets based on S1 handover is disclosed. The method includes: receiving state report information of the packet sent by the target eNodeB; and sending the packet according to the state report information of the packet. Another method for forwarding downlink packets based on S1 handover and an eNodeB are disclosed. Through the embodiments of the present disclosure, the packets are forwarded without loss in the case of S1 handover.

主权项

1. A method for forwarding downlink packets, comprising:
receiving, by a target evolved NodeB (eNodeB), when ensuring a lossless handover for a user equipment (UE), a control message outside a user plane from a source eNodeB, the control message including an initial Packet Data Convergence Protocol (PDCP) serial number (SN) and a defined relationship between the initial PDCP SN and a GPRS tunneling protocol user serial number (GTP-U SN); receiving, by the target eNode B, a plurality of packets without processing (non-PDCP packets), each non-PDCP packet in the plurality of non-PDCP packets being already numbered with its corresponding unique GTP-U SN; processing, by the target eNodeB, the plurality of non-PDCP packets into PDCP packets by assigning the initial PDCP SN for a first non-PDCP packet, and assigning a PDCP SN to each remaining non-PDCP packet in accordance with the GTP-U SN corresponding to the remaining non-PDCP packet and the relationship between the initial PDCP SN and the GTP-U SN of the first non-PDCP packet; and sending, by the target eNodeB, the PDCP packets to the UE.