Optimum Cell Size for Police Use

In this paper the determination of the optimum cell size in a cellular mobile communication system is described. These cells are defined within clusters and both the size of the cells as well as the clusters are varied, therefore also the influence of the interferers. This research used the TETRA (TErrestial Trunked RAdio) standard which among other things will be used in the Netherlands for public order and safety. These services require harder specifications, i.e. the probability of not being able to establish a connection must be lower for those services compared to public services (e.g. GSM). Together with measurements of different areas taken in the Netherlands by the IT-organisation, environmental parameters are extracted and used to determine the optimum cell size. The used propagation-model is the corrected Eglimodel. The influence of the used frequency and environmental aspects are all included in the clutter factor. This factor turned out to have specific values for different areas (Urban, Sub-Urban and Rural) and with it different radii are determined.