Mobile communication is the basis for one of the fastest growing business areas at the beginning of the 21 st century. With IMT-2000 (International Mobile Telecommunications 2000), high-speed communication is possible anywhere, at any time, to any communication partner, with almost any device. As IMT-2000 comprises a set of different networking technologies, it provides a communication framework in which a subscriber may freely roam without having to be concerned about which network to use [1]. Hand-over procedures seamlessly integrate in-house networks, campus-based networks, metropolitan and wide area networks.

However, the companies active in the area of mobile computing made huge investments to secure a place for themselves in the IMT-2000 business. These investments must lead to an appropriate revenue achieved by mass acceptance of mobile data services. The outlook is quite optimistic, as the number of worldwide mobile cellular subscribers rose from about 23 millions in 1992 to almost 700 millions in 2000. But mass acceptance must on the one hand be achieved by networking architectures offering adequate quality of service and attractive tariffs. On the other hand, services have to be provided that make potential customers subscribe to a mobile network provider. And as a killer application for IMT-2000 has not been found yet, experts believe that business will be driven by a mixture of applications.

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