Patent ID: 8098626

Claim:
A packet transfer control method in a case where a mobile terminal performs handover from a first access point to a second access point in a communication system in which a first access router having the first access point thereunder is connected to a second access router having the second access point thereunder via a communication network, the method comprising: a packet storage step in which at least one of the first and second access routers stores a packet to be sent to the mobile terminal that is arrived while the mobile terminal performs processing concerned with the handover; an information notifying step in which the mobile terminal transmits information indicating a correspondence between packet identification information to identify a type of the packet concerned with packet communication performed by the mobile terminal and a time based on a delay allowance time concerned with the packet having the packet identification information to transmit the information indicating the correspondence to at least one of the first and second access routers storing the packets; and a transfer control step of performing control so that at least one of the first and second access routers in which the packets are stored does not transfer, to the mobile terminal which has completed the handover, the packet stored in excess of the time based on the delay allowance time among the packets stored in the packet storage step, based on the information indicating the correspondence obtained in the information notifying step, when the packets stored in the packet storage step are transferred, and transferring the remaining packets.