Patent ID: 7872998

Claim:
A mobile communication system composed of a home agent, a mobile node, and one or more correspondent nodes, wherein said mobile node comprises: means for storing a preassigned representative home address, one or more preassigned subsidiary home addresses, and a care-of address temporarily assigned in a network in which the mobile node is currently present; and means for making a registration request for joint information which relates the representative home address to all subsidiary home addresses and the care-of address to said home agent, each time the mobile node moves to other network, and is assigned a new care-of address, and wherein said home agent comprises: means for receiving the registration request for said joint information, and if a packet destined for the representative address or any of the subsidiary addresses arrives from any correspondent node, retrieving the joint information including the representative home address or the subsidiary home address, from a table in which the joint information is registered, and transferring the packet to the care-of address corresponding to the address for which the packet is destined; and a plurality of mobile network nodes being located under said mobile node, the plurality of mobile network nodes constituting a local network with said mobile node as a router, wherein said mobile node further comprises: means for assigning the subsidiary home addresses to the mobile network nodes, and if a packet destined for the subsidiary home address assigned to the mobile network nodes arrives, transferring the packet to the corresponding mobile network node, whereby said mobile node performs location registration for the mobile network nodes in the local network managed by said mobile node by proxy, and transfers the packet destined for the mobile network node.