Patent ID: 8325677

Claim:
A communication system, comprising: a mobile node; a source relaying intermediate node at a movement source of the mobile node; and a destination relaying intermediate node at a movement destination of the mobile node, wherein before, during and after the relaying intermediate nodes are switched in accordance with movement of the mobile node, the mobile node continues communication using a same predetermined address assigned to the mobile node, based on switching of the relaying intermediate nodes, a data transfer route is established from the source relaying intermediate node to the destination relaying intermediate node, and data is transferred from the source relaying intermediate node to the destination relaying intermediate node at the movement destination, and the source relaying intermediate node sends a transfer termination notification to the destination relaying intermediate node when the data transfer is terminated, wherein the source relaying intermediate node continues the data transfer by maintaining the data transfer route until data to be transferred in a buffer for storing temporary transfer data has become zero.