Research On Energy-Efficient Algorithms By Variable Range Transmission Scheme In Wireless Sensor Networks

Wireless Sensor network (WSN), which is made by the convergence of sensor, nested computation, networks and wireless communication technologies, is a novel technology about acquiring and processing information. It is a late-model wireless networks of infrastructureless network and can be used for testing, sensing, collecting and processing information of monitored objects. WSN is a new research area of computer science and technology and has a wide range of applications such as military, environment, health, industry control and so on. Both academia and industries are very interested in it.Energy-efficient algorithms analysis and effective improvements of WSNs are the main parts of this dissertation. The numbers of sensor node in WSN are numerous and single node is extraordinarily limited in resource. The all-important aim of improving the algorithms of WSNs is to reduce the overall energy dissipated in the network and to maximize the network lifetime. Based on two goals of energy-balanced and optimal total energy consumption in WSNs, we analyzed and compared some algorithms that proposed by oversea researcher, and assimilated excellence idea among these algorithms to improve them respectively by Variable Range Transmission scheme in this paper. The results which simulated on the Matlab shown that these improved algorithms have achieved their design goals: With a sufficient sensing coverage in WSNs, these improved algorithms can not only keep the energy consumption well balanced among the route nodes, but also can minimize the total energy consumption obviously.The main research and innovation of this dissertation are as follows:1. Based on the analysis of energy consumption of linear networks, a scheme called Variable Range Transmission is presented.2. By the Variable Range Transmission scheme, we improved the Hop-by-hop algorithm who presented by energy model of data density to optimize the total energy consumption.3. In order to get some useful parameters, the sensing coverage and sleeping probability of nodes are analyzed in this paper.4. Based on the Variable Range Transmission Scheme and these useful parameters which gotten in step 3 to adjust the routing range to get all of the feasible routing deployments. Then compared all of the balanced-factors which belong to all of the feasible routing deployments to get the best solution, and a heuristic algorithm was designed to explain how to get the best solution. Finally, Energy-efficient effective improvements were done by the heuristic algorithm.