| Summary: | 碩士 === 明新科技大學 === 資訊管理研究所 === 100 === In wireless sensor networks, sensor nodes depend on battery power to perform several tasks, such as transmitting, receiving, and computation. Thus, designing an energy efficient routing protocol becomes an important issue. Previous studies on efficient routing primarily exploit the clustering approach, in which the whole network forms a cluster structure, and all sensor nodes are divided into multiple logical groups, called clusters. In this structure, parts of nodes participate in forwarding data packets. In general, determining proper forwarding nodes is important to design an efficient cluster structure. This thesis considers both residual energy and link quality, and proposes an energy and link efficient clustering technique, called ELECT, to construct an effective cluster structure. The proposed ELECT is based on the passive clustering mechanism. In ELECT, each candidate forwarder determines its priority depending on its remaining energy, link quality, and the number of successive transmissions, and uses a strategy based on its priority to contend for a forwarder. Simulation results validate that, compared with the passive clustering mechanism and other approaches, ELECT significantly achieves a higher packet delivery ratio. In addition, ELECT causes lower transmission delay and less energy consumption than other approaches.
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