Patent ID: 8837310

Claim:
A method for determining an end time of uplink back propagation in a mobile communication system, comprising the following steps: sending, by a source base station, data with consecutive sequence numbers in a buffer of a packet data convergence protocol (PDCP) module to a serving gateway (S-GW) via an S1 tunnel; sending, by the source base station, data with inconsecutive sequence numbers, which is from data with a first inconsecutive sequence number to last data in the buffer of the PDCP module, to a target base station via an uplink back propagation tunnel; generating, by the source base station, an end marker datagram after the source base station has sent the data with inconsecutive sequence numbers; sending, by the source base station, the end marker datagram to the target base station via the uplink back propagation tunnel; and receiving, by the target base station, the end marker datagram and determining that the uplink back propagation has ended.