Abstract
The International Telecommunication Union (ITU) is currently setting standards for the third-generation International Mobile Telecommunication 2000 (IMT-2000) system. This system offers its users mobile multimedia services with a global roaming capability. This capability allows IMT-2000 users to invoke the services they have subscribed to with their home network service provider anywhere around the globe in a manner transparent to them. The requirements for global roaming relate to three distinct functional capabilities of the network: mobility management, call/connection control, and service transportability. In this paper we address the role service transportability plays in offering the virtual home environment (VHE) to IMT-2000 users. To achieve the IMT-2000 global roaming capability, service transportability combines the concept of the Intelligent Network's distributed functional plane (DFP) across different IMT-2000 systems with a number of VHE implementation scenarios. We describe the IMT-2000 system and its various VHE implementation scenarios, evaluate those scenarios, and prioritize their deployment with respect to criteria such as location of service control, location of service database, point of service invocation, and required standardization effort.
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