The development of radio networks has prompted an examination of the propagation characteristics encountered at coverage zone. Many models have been proposed to predict propagation losses and communication performance, without considering interference problems. In addition, because of variety of the available methods, the appropriate selection of one of them for a particular situation can be difficult. In this paper, a new technique to radio networks design in urban and rural areas, which allows choosing the best, by mapping of models for the propagation losses and interference parameters is presented. Field strength and the problems of the interference parameter estimation are described by using the average distance conception performance for a variety of radio communication links. A concrete mapping of models for different kinds of zones is presented.

The correct prediction of coverage zones, signal strength levels and interference parameters are still questions of high importance for various types of radio networks (Allserbrook and Parsons (1977); Green (1990), Parsons (1992); Iskander and Yun, 2002; and UTU, CCIR). In particular, these problems have not got a satisfactory solution for Mobile Radio Services in UHF/VHF band in both urban and rural areas.

In order to establish the coverage zone of radio systems, the main goal is the prediction of propagation losses and also the evalution of fading and interference parameters is important. Therefore in the following losses models for the irregular terrain will be examined. They allow to predict the average power density in the receiving terminal, coverage zones, etc. From a multitude of papers, concerning to this topic, we will consider Okumura-Hata (Oda et al. (2000), Ibrahim and Parsons (1983), Parsons (1992) and Egli (1957)) models.

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