Patent ID: 8817715

Claim:
A method for registering with a Home Agent of a Mobile Node in an Internet Protocol Version 4 (IPv4) network, the IPv4 network comprising at least one Mobile Node, a Home Agent, and a plurality of Foreign Agents, the method comprising: selecting at least two Foreign Agents from the plurality of Foreign Agents to form a Foreign Agent Group having a coverage area; Foreign Agent members within the Foreign Agent Group sharing information of a Mobile Node roaming into the Foreign Agent Group coverage area, wherein the Foreign Agents of the Foreign Agent Group maintain a Visitor Information Table to maintain the Mobile Node's information, wherein the Visitor Information Table is created by a registration process of the IPv4 network at the Foreign Agent members of the Foreign Agent Group, and wherein the Visitor Information Table comprises information about the Mobile Node's home address, a Home Agent address, an address of a current Foreign Agent, and a lifetime of the current registration, wherein the current Foreign Agent indicates which Foreign Agent is providing services to the Mobile Node currently; when at least one Foreign Agent member of the Foreign Agent Group receives a registration request to register a care-of address with the Home Agent from a Mobile Node, determining whether the Mobile Node enters into the Foreign Agent Group coverage area for the first time according to the shared MN information; if the Mobile Node enters into the Foreign Agent Group coverage area for the first time, the Foreign Agent forwarding the received registration request to the HA; otherwise, the Foreign Agent directly sending a registration response to the Mobile Node.