Patent ID: 8781470

Claim:
A method for transmitting data when handover of communication with a mobile station occurs from a first base station to a second base station in a mobile communications system, comprising: a) receiving a plurality of data packets from the mobile station at the first base station; b) determining one or more of the data packets received at the first base station for retransmission; c) notifying the mobile station to retransmit said one or more data packets to the second base station; d) the mobile station retransmitting said one or more data packets to the second base station; and e) reversely transmitting the one or more data packets from the second base station to the first base station; wherein: the first base station performs retransmission control using the one or more data packets received from the second base station; and in parallel with retransmission control performed by the first base station, the second base station performs retransmission control for data received from the mobile station.