Sufficient level of radiation power of GSM base stations on urban area taking into account attenuation of radiowaves in buildings and intrasystem electromagnetic compatibility

Abstract

The results of estimation of required and sufficient levels of radiated power of base stations of cellular communications of GSM standard at the voice communication mode on urban area, taking into account average attenuation of radio waves in buildings and levels of intranetwork interference are given. The analysis is made on the basis of behavior simulation of the fragment of cellular network, executed with the use of multibeam radiowave propagation model and the topological model of a fragment of urban area of the central part of Minsk by comparison of quantiles of statistical distributions of levels of received signals on various floors of buildings and also relative quantity of mobile stations, for which «Signal / (Interference + Noise)» ratio does not exceed a critical threshold of 9 dB, on various floors of buildings at different radiation power of base station. In the modeled urban area of medium number of building storeys the high communication quality is achieved at base station of GSM-1800 networks equivalent isotropic radiated power 43-45 dBm, and is provided by improvement of intrasystem EMC of cellular network at the expense of increase of cluster dimensionality of frequency sharing. Increase of base station radiation power greater than 45 dBm does not lead to improvement of communication quality, but impairs electromagnetic ecology of urban areas.