Different Node Distribution Strategies for Mitigating the Energy Hole Problem in Wireless Sensor Networks

• Main Authors: Jia-syong Su, 蘇嘉雄
• Other Authors: Pi-rong Sheu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/66640435899653340992

碩士 === 國立雲林科技大學 === 通訊工程研究所碩士班 === 99 === By a multi-hop transmitting way, sensor nodes send data to the sink, which is placed at the center in concentric circles of a wireless sensor network (WSN). Sensor nodes closer to the sink have numerous data loads and quickly consume energy of battery. As the result, some nodes may form an energy hole in a WSN. The network lifetime is ending when the energy hole appears. Using a non-uniform node distribution architecture is possible to lighten the energy hole problem, but the number of nodes will be larger as nearing the sink. In this thesis, we propose a new architecture, called a uniform node distribution with agent nodes architecture, to solve the energy hole problem and the phenomenon of non-uniform node distribution. The agent nodes and sensor nodes are set uniformly in a WSN. Agent nodes can receive data form sensor nodes and transmit data to the sink. We design the number of agent nodes and sensor nodes, build mathematical models, and analyze the energy effect such that the consumed energy of each sensor node is balanced. Simulation results show that performances of the uniform node distribution with agent nodes architecture are better than performances of the uniform node distribution architecture and the non-uniform node distribution architecture in terms of energy effect and network lifetime. Furthermore, we propose a new architecture called a non-uniform node distribution with data fusion architecture. We assume that sensor nodes have data fusion ability. We build a mathematical model and analyze sensor nodes with data fusion ability that the consumed energy of each sensor can be balanced. According to the data fusion rate of each sensor, we set the number of neighbor coronas sensors. Simulation results show that performances of our proposed architecture are better than performances of the non-uniform node distribution architecture in terms of energy effect and network lifetime.