Patent ID: 7349364

Claim:
A mobility management system in a packet telecommunication network, comprising: a plurality of access routers configured to provide links to a mobile node; and a plurality of mobility management nodes configured to manage mobility of the mobile node, wherein, the mobile node is configured to use a home address continuously used even with change of a connected link, and a CoA acquired at every change to a connected link and which specifies the mobile node in the connected link, wherein each of said mobility management nodes comprises cache means for storing binding between a home address and a CoA corresponding to the mobile node; CoA configuring means for configuring a plurality of new CoAs that are candidates for use by the mobile node after change of a connected link to another, in response to a first request from the mobile node; and storing means for storing the plurality of CoAs thus configured, in binding relation with the home address of the mobile node in said cache means, wherein said CoA configuring means performs a search for another access router located within a predetermined range from an access router, and configures a CoA of the mobile node on the basis of part of an address about an access router obtained by the search and part of an address about the mobile node.