Patent ID: 8687496

Claim:
A reordering method for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station, the reordering method comprising: when a handover source base station transfers packets which have not been sent to the mobile station, out of packets received from a host station, to a handover target base station, and the handover target base station sends the packets to the mobile station, sending data from the source base station to the mobile station to notify that transference of the packets from the source base station to the target station has been executed at the execution of handover sequence; sending data from the source base station to the mobile station to notify that transference of the packets is not executed at the execution of the handover sequence, when the packets are not transferred to the handover target base station; and at the mobile station judging whether transference of the packets is executed with reference to said data, and executing reordering of the packets received from the handover target base station when the transference of the packets has been executed wherein the mobile station does not execute reordering of the received packets when the transference of the packets has not been executed.