The UMTS Mobility Server: a Solution to Support Third Generation Mobility in ATM

For the third generation mobile systems (UMTS, FPLMTS) an integration with B-ISDN is foreseen. This integration is not limited to service integration (common services for mobile and fixed networks), but also aims at reusing B-ISDN switching and transport infrastructure. In this paper the UMTS Mobility Server is presented as a solution to support third generation mobility in ATM. The Mobility Server is a dedicated network element that handles the specific mobility functions. As such, it has a very limited impact on the existing B-ISDN switches. The mobility functions that are performed by the Mobility Server are: transport interworking/integration, bridging, macrodiversity and combining, and seamless handover.

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