Patent ID: 7522907

Claim:
A method for performing data interchange between a first network, which is based on a first technology, and a second network, which is based on a second technology, comprising: setting up communication between a station and the first network, using the first technology, and basic functions of the first network; performing authentication and/or authorization of the station at a first server providing Authentication, Authorization and Accounting (AAA) functionality located in the first network, the first server in the first network authenticating and/or authorizing the station to use services in the first network wherein data specific to the station or specific to a subscriber using the station used for performing the authentication and/or authorization are obtained from a data source external to the first network, and the subscriber using the station has a subscription in the first network and a subscription in the second network; providing the station with billing functions, the billing functions being provided by the first server in the first network, the billing functions being specific to the second network; and transferring billing related data specific to the subscriber between the first server in the first network and a second server providing AAA functionality located in the second network, wherein the second server in the second network processes the billing related data specific to the subscriber in line with methods customary in the second network, the station is authenticated through a Subscriber Identity Module (SIM) card reader associated with the second network or though a subscriber station associated with the second network but located in the region of the station in the first network, and the first network is a local network and the second network is a cellular mobile radio network.