Patent ID: 7266100

Claim:
A method of updating a session path for a mobile node in a packet based mobile communication network, the method comprising: providing a plurality of authentication, authorization and accounting (AAA) servers used for handling authentication, authorization and accounting requests for the mobile node in a respective domain, wherein one of the AAA servers is a home AAA server of the mobile node, and providing a plurality of access nodes covering a respective coverage area via which the mobile node communicates within the network, wherein each of the plurality of access nodes is connected with at least one of the plurality of AAA servers, initiating a session by the mobile node via one of the plurality of access nodes in the network; establishing a session path from a home authentication, authorization, and accounting (AAA) server via a AAA server in whose domain the mobile node initiated the session; setting the AAA server in whose domain the mobile node initiated the session as an anchor AAA server; wherein, when a handover of the mobile node from one previous access node to another current access node is performed during the session, producing and transmitting a session update request message from the current access node via the connected AAA server to the anchor AAA server; processing the session update request message in each AAA server receiving the session update request message; and updating the session path on the basis of a processing result of the session update request message.