| 摘要 |
In order to provide telecommunication services, local area networks are connected to a mobile communication system, for example. User equipment (UE) using such a combination system is authenticated to the home network via the visited network and the local area network base station (AP1, AP2) serving the user equipment in such a way that the authentication is transparent to the visited network. As a result of successful authentication, a session is established between the visited network and the home network. So as not to establish a new session for user equipment already authenticated, the visited network is arranged to recognize (2-7) the user equipment to be re-authenticated and to use (2-9) an existing session between the visited network and the home network for the user equipment to be re-authenticated. <IMAGE>
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