Patent ID: 6925087

Claim:
A packet transfer method, comprising: generating a global address that is unique on Internet at a mobile terminal device, the global address being an address which should be used by the mobile terminal device in utilizing an Internet service provided by a mobile communication network to which the mobile terminal device is connected, according to a message received from a nearest neighbor router device in the mobile communication network; notifying a first message indicating a start of a utilization of the Internet service using the global address, from the mobile terminal device to the nearest neighbor router device at a time of starting the utilization of the Internet service using the global address; delivering arrived packets destined to the global address of the mobile terminal device from the nearest neighbor router device to the mobile terminal device upon receiving the first message at the nearest neighbor router device; notifying a second message indicating an end of the utilization of the Internet service using the global address from the mobile terminal device to the nearest neighbor router device at a time of ending the utilization of the Internet service using the global address; and discarding arrived packets destined to the global address of the mobile terminal device at the nearest neighbor router device upon receiving the second message at the nearest neighbor router device.