Optimized Line Amplifier Placement for Energy Saving: a Case Study of ethio telecom Optical Backbone Network
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Date
2020-02
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Addis Ababa University
Abstract
In recent years, traffic volume is increasing tremendously. In line with this increment,
telecom operators expand their network infrastructure. This increases power consumption of
the network. Especially in a backbone network, where power consumption is dependent on
traffic volume, the increase in power consumption is becoming critical.
Researchers are made efforts dedicated to reduce unnecessary energy waste in backbone
networks using physical topology optimization for highly connected networks, but this
optimization is not feasible for low connected networks like ethio telecom. In addition, line
amplifiers are placed at regular interval of 80km without considering physical and economic
restrictions. In practice, amplifier placement is commonly implemented by operators to
guarantee a signal quality considering placement location with availability supply power,
shelter, and physical security with the expense of high power consumption. Current ethio
telecom line amplifiers are placed at span length ranging from 25 to 120km considering these
physical and economic restrictions; due to this, ethio telecom is subjected to high power
consumption in line amplifiers.
In this thesis, optimized line amplifier placement, which takes power consumption and
physical and economic restrictions in to account is investigated. Mixed Integer Linear
Programming (MILP) formulation which takes span length and input power level constraint
is proposed. The proposed power-saving approach is evaluated considering ethio-telecom
North circle optical backbone network topology. MATLAB is used to assign optimum
placement location. The result is compared with theoretical standard (80km spacing) and the
practical (ethio telecom current deployment scenario) using number of amplification sites and
power saving performance. The comparison results show that amplifier site placement using
the new approach can minimize the number of amplification sites by 9 from the theoretical
approach and by 5 from the existing configuration and a 2% power saving can be achieved in
the case study network portion.
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Keywords
Amplifier placement, Energy saving, Optimization, physical layer parameters