Analyzing and Assessing Tradeoffs and Effects of Energy Related Parameters on Wireless Sensor Networks for Optimizing Sensor Network Lifetime

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Addis Ababa University


Sensor technologies have become vital today in gathering information about close by environments and its use in wireless sensor networks is getting widespread popular every day. These networks are characterized by a number of sensor nodes deployed in the field for the observation of some phenomena. Due to the limited battery capacity in sensor nodes, energy efficiency is a major and challenging problem in such power constrained networks. To extend the life time of wireless sensor networks as well as conserving its power, some network parameters have been considered, which play an important role in the reduction of power consumption. These parameters are as battery capacity, communication radius, node density and query period. They have a direct impact on the network’s lifetime. These parameters have to be chosen in such a way that the network use its energy resources efficiently. In This thesis we study these parameters that should be selected according to certain tradeoffs with respect to the network’s lifetime. Their tradeoff characteristics have been investigated and illustrated in detail in various combinations. To achieve this goal, a special simulation tool that helps in analyzing the effects of the parameters on sensor network lifetime has been designed and implemented by means of OMNet++; a discrete event simulator provides the framework for the sensor network simulator’s development. Ultimately, results of extensive computational tests are presented, which may be helpful in guiding the sensor network designer in optimally selecting the parameters proposed to improve the lifetime of the network.



Network Lifetime