Patent ID: 7069338
Filing Date: 2006-06-27
Classification: H04W

Abstract:
1. A registration method for use in a system having a hierarchical structure comprising a mobile node, at least one foreign agent, at least one gateway foreign agent and a home agent, said method comprising the steps of: intercepting a registration request from a mobile node to its home agent, said registration request including a first care-of address for said mobile node; determining whether there is an existing entry in a visitor list for said mobile node; if said entry exists, updating said entry, if no entry exists, creating an entry in said list for the mobile node, adding a second care of address as an extension to said registration request, and sending said registration request with said address extension to said home agent; sending a registration reply to said mobile node; and maintaining in a gateway foreign agent a first and a second lifetime value, wherein said first lifetime value corresponds to the lifetime of a registration by said mobile node with its home agent, and said second lifetime value corresponds to the lifetime of a registration by said mobile node with a gateway foreign agent.