SUMMARYMicro and pico cell planning strategies are adopted in personal communication systems (PCS) in order to increase their capacity. The usage of the upper UHF band in combination with greater bandwidth is already proposed by telecom engineers in order to achieve the promised service quality and data rates. These strategies are characterized by an increased number of cells in speci"c geographical areas with the corresponding operating base transceiving stations (BTS) located at relatively low heights above the street level. In this case, the cell planning procedure in linear streets under line-of-sight (LOS) conditions needs further study concerning the technical characteristics of the PCS.In this paper, the propagation characteristics of a DCS 1800 system are investigated on a theoretical and experimental basis in a speci"c geographical area (center of Patras City in Northern Pelloponesse). An improved RF propagation model is proposed in order to determine the propagation path losses occurring under certain multipath fading conditions. Hence an optimum determination of a system's cellular area can be achieved.

SUMMARYAn alternative mathematical expression for the co-channel interference probability is used, in order to calculate the cellular mobile radio system capacity and to construct a set of compatibility constraints needed for the development of fully adaptive channel allocation (FACA) strategies. The development of such channel allocation techniques becomes a main thrust for the system engineers in order to design an e$cient system to manage tra$c demands over the service area of a third generation cellular system. Three proposed FACA strategies are analysed and a simulation model is developed, in order to examine the performance of these strategies.

The demanded maximization of system's capacity and in combination with the usage of high operating frequency, leads the Telecommunication Systems designers to adopt strategies based on micro and pic0 cell planning. These strategies, employ a large number of cells, with the corresponding Base Transmitting and receiving Stations located at relatively low heights above street level. To be effectual a cell planning, is important to have the knowledge on the effects of both, the multipath transmission and propagation in lineal streets under Line-of Sight conditions. This paper investigates theoretically and experimentally the propagation characteristics of a DCS 1800 system operating in the city center of Patras. Moreover, a new RF propagation model is presented that determines and approximates efficiently the involved propagation parameters suitable for the optimum determination of the system's cellular area.The new proposed RF model is based on the involved parameters relative to the propagation path losses and multipath fading.

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