Patent ID: 8526434

Claim:
A method of mobility management in an IP-based network system that includes a plurality of routers and a plurality of servers, including a home routing manager (HRM) and local routing managers (LRM) for individual mobile nodes, the method comprising the steps of; sending from an LRM a first query about a routing address of a destination mobile node toward the HRM, the sending of the first query being based on an activation notification (AN) from an ingress access router (AR) of the plurality of routers, the AR being triggered by a source mobile node; relaying the first query via a first path, including one or more LRMs acting as intermediate routing managers (IRM) closer to the HRM until the first query reaches the HRM; in response to the first query, the HRM sending the routing address of the destination mobile node back to the ingress access router along the first path; sending from an egress access router having the routing address a second query about a home address of the source mobile node to an LRM which performs mobility management for that egress access router; relaying the second query via a second path including one or more LRMs acting as intermediate routing managers (IRM) until the second query reaches an LRM advertising a routing address of the ,Source mobile node without passing through the HRM unless the home address of the source mobile node has been reported to the HRM; and in response to the second query, the LRM advertising the routing address of the source mobile node by sending the home address of the source mobile node back to the egress access router along the second path.