Packet data retransmission method and apparatus between base station controller and base transceiver system in a mobile communication system

A method and apparatus for retransmitting packet data lost of packet data transmitted to the base station in the base station controller of the mobile communication system is disclosed. According to the present invention, the base station determines that the received and lost packets of the packet transmitted from the base station controller in order. When the lost packet is determined, the BS requests the buffering of packets after the packet loss and retransmission of the lost packet to the base station controller. The RNC retransmits the packet corresponding to the response to the retransmission request from the base station to the base station. Then, the base station transmits the packet rearranging the packets and the buffered packets retransmitted from the base station controller according to the order and reordering at the mobile station. Retransmission, the packet data is lost, the base station controller, a base station, the reordering