# Frequency Assignment Problem Optimization of GSM Network in the case of Addis Ababa

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## Date

2014-09

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Addis Ababa University

## Abstract

In GSM systems, radio frequencies are repeatedly used in order to efficiently use assigned
frequency bands. To expand the network capacity, one solution is to reuse the limited frequency
resources. Currently the 4x3 frequency reuse technologies for GSM network is in common use
here in Addis Ababa. For this reuse model “4” indicates the number of Base Transceiver Stations
(BTSs) in the reuse clusters, and “3” indicates the number of cells (sectors) under each BTS. As
the number of users increases from time to time, the number of cells increases. Thus, the search
space which is the possible range where optimum solution is attained increases. Furthermore,
attaining optimum frequencies under each cell is challenging task.
This thesis presents group frequency assignment method for the frequency assignment problem
in Addis Ababa using genetic algorithm technique. Without violating the 4x3 frequency reuse
used currently, the optimization was performed in Addis Ababa with 933 DCS (Digital
Communication) 1800 MHz bandwidth cells (sectors). With proper optimization five frequencies
can be used under each cell with a group of 24 cells and 125 generations or iterations using the
algorithm. This assignment enhanced us to use two more frequencies under each cell than ethio
telecom assignment which uses Mentum planet as optimization tool. And thus, capacity of the
system increased.
Key words: Frequency Assignment Problem Optimization; Genetic Algorithm

## Description

## Keywords

Frequency Assignment Problem Optimization, Genetic Algorithm