Could you help me"what is the future public mobile telecommunication systems?"?

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This article indicates potential evolutionary scenarios from several starting points toward the target UMTS and investigates additional options for potential cooperation between existing systems. The definition of any evolution process should start with the definition of the process's target; therefore, the author provides a brief description of the target UMTS. Five evolution scenarios toward UMTS are introduced, including a fixed network offering intelligent network and cordless terminal mobility services, cellular networks (i.e., GSM), cable networks offering wireless local loop, satellite networks, and a standalone UMTS scenario. Cooperation options for the identified systems and operators are identified.
Integration and Evolution of Existing Mobile Telecommunications Systems toward UMTS
T. Magedanz, GMD FOKUS/Technical University of Berlin




The vision of future telecommunications is "information at any time, at any place, in any form." This requires the provision of universal service access and mobility support, including both personal and terminal mobility. Therefore, emerging third-generation mobile telecommunications systems play an important role, since they should provide universal access to a wide range of basic and supplementary telecommunications services supported by fixed networks -- for example, public switched telephone network (PSTN), integrated services digital network (ISDN), and broadband ISDN (B-ISDN) -- and to other services specific to mobile users. In particular, these systems aim for the integration of all mobile radio applications (cordless, cellular, and paging systems, including mobile satellite systems) into one universal system.