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GOS optimization in wireless cells By Shirley Kulback & Avihay Rosenboim Supervisor Dr. Ran Giladi Abstract When users of wireless cellular networks have partial or full access to more than one cell they have to be assigned to a cell's radio channels for call initiations. The assignment affects the utilization of the wireless cellular network and its efficiency. In this study we will present a model for various network configurations in which a group of subscribers can initiate calls from two or three cells while other groups of subscribers can initiate calls from only one cell. Two channel selection policies for call initiation, random and controlbased, will be described for fixed wireless cellular networks. It was found in the past [Giladi, 2002], that by using an optimal random coefficient, a random selection policy achieves results that are almost as good as those achieved by a controlled policy. Today, when subscribers can get service from more than one cell, policies assign these subscribers to the cell with the strongest signal received, which usually arrives from the closest base station. However, this approach disregards the load in the system and therefore degrades the utilization of the system's resources. System efficiency can be significantly improved if the subscribers can be assigned to a base-station according to a policy that is based on network utilization or load, which is the purpose of this work. Implementation The implementation of the project was divided into two different phases. 1. Examining a simplified and analytical solution for solving the limited availability problem. And adjusting it to our system. This phase was mathematical, and the tools for performing it were research. 2. Expanding an existing numerical solution for the problem, from a system with two base stations, to a system with three base stations. This phase we have implemented the solution in the ‘Matlab’ tool.