With a rapid development of information and telecommunications, studies on Future Public Land Mobile Telecommunication Systems(FPLMTS) are under progressing, which are aimed at providing mobile telecommunications. These studies are intended to develop systems that could be used commercially around the $21^{st}$ century in many different operating environments. Currently International Telecommunications Union(ITU) has announced a draft version of definition of functional entities and interaction among functional entities for conforming FPLMTS. Many countries are under studying the development of FPLMTS but there are no concrete systems for FPLMTS. In this thesis, four feasible platforms for FPLMTS based on an activity of functional entities is suggested. To evaluate system performance of proposed physical platform for an optimal FPLMTS, computer simulation is done. In general, system performance is highly dependent on the distribution of functional entity into physical network configuration. In view of system processing delay and throughput, the performance of distributed platform is superior to that of centralized platform since processing overhead imposed on the system in case of heavy traffic is distributed to the physical entities.
