Patent ID: 8644249

Claim:
A telecommunication system operating with a first network which is a cellular mobile radio network and a second network which is a Worldwide Interoperability for Microwave Access radio network, and communicating with at least one user terminal equipped to use both the first network and the second network, said telecommunication system comprising: an authentication, authorization and accounting (AAA) server that: stores user data of a user terminal, makes the user data accessible to both the first network and the second network, and assists in a switchover of the user terminal between the first and second networks by a mobility protocol that defines a mobile client to handle switchover signaling and a proxy mobile client to handle the switchover signaling, wherein the mobile client is equipped for switchover signaling by a first user terminal capable of performing the switchover signaling on execution of a switchover of the first user terminal between the first and second networks, and wherein the proxy mobile client is implemented in the first cellular mobile radio network as a proxy for a second user terminal not capable of performing switchover signaling to execute switchover signaling when switching the second user terminal between the first and the second networks, when a connection is established between the first or the second user terminal and one of the first and second networks, if determined that the first or the second user terminal is already connected to other one of the first and second networks, the user data is retrieved by said authentication, authorization and accounting server, and if the first or second user terminal is not already connected to the other one of the first and second networks, user data created when the connection is established is stored in said authentication, authorization and accounting server.