A.W. Logvinov – Ph. D. (Eng.), Professor, Volga State University of Telecommunications and Informatics (Samara)
A.I. Tyazhev – Dr. Sc. (Eng.), Volga State University of Telecommunications and Informatics (Samara)
When creating cellular networks is an important task optimal placement of base stations (BS). There are currently a sufficient number of techniques to resolution of the problem of accommodation BS. Criteria for optimal positioning of BS studied in many papers. But they are mainly a problem of optimal location BS solved for the urban environment, where it is necessary to take into account a large population density in some areas, time-varying traffic, multipath propagation others. As a criterion for the optimal location of the BS, as a rule, is the maximal number of served tion mobile stations (MS). In rural areas, the number of MS is low, but there are trying to place the BS so that they cover the maximum number of MS. However, the practice in cellular operation countryside shows that there is advisable to place the BS so as to maximize the area of reliable reception at a fixed number of BS. With this arrangement, the BS bond will be provided by the subscribers who are not only in towns but also in the field, in the woods, lakes, river banks, etc. It is obvious that the conditiontions BS optimal location in the countryside on these two criteria are fundamentally different. Provide maximum possible area of reliable reception at a limited number of BS is important, but at the same time a specific task, which is characteristic for our country, with its large open spaces. Solving this problem can substantially reduce the economic costs in the design of cellular networks, providing reliable communication over large areas with low population density.
Optimizing the location of the BS in the countryside by the criterion of the largest service area involves the following stages of the work. In the first stage, the definition of fissionable territory where the installation BS on those or other reasons can not (the presence of water surface, private property, and others.). These areas should not be considered in the design-vatsya cellular and install it BS. At the second stage, the areas preferred location BS (trunk roads, settlements and others.). In the third stage, the analysis of the surface area covered by cellular communication, taking into consideration its curvature. The curvature of the surface determines the pitch of research areas. In the fourth stage the electromagnetic compatibility (EMC) in the areas of alleged installation BS. If the analysis of EMC certain areas do not meet the requirements of EMC, they are also excluded as the installation location BS. In the fifth step is the calculation of the area of reliable reception BS located at the selected point. In the sixth stage, the placement of the rest of the BS, and also calculated the area of reliable reception of these stations. Then the area of reliable reception of all outstanding BS summed with the areas of overlap. In the seventh stage, the movement of each BS allowable transfer zone, and the process of determining the area of reliable reception is repeated. Moving BS on the ground ends when all the BS rasstanovleny so that their total area is most reliable reception. At the last stage, the eighth survey shadow zones with the propagation of radio waves. As a result of this study are defined areas where reception is possible with non-whose probability.
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