| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 95 === A wireless sensor network is composed of a large number of sensor nodes which consist of sensing, data processing, and communicating components. The sink node is responsible for data collection. It consumed a large amount of energy, that the sender unicasts the data to multiple sink nodes. In order to reduce the energy consumption, the sender should use multicasting mechanism.
The multicast protocol proposed by the thesis is consisting of multicasting cost computation, multicasting table building, multicasting table pruning. In multicasting cost computation, the thesis deduced the formulations of multicasting cost. In multicasting table building, the thesis used the information of multi-path routing table to build the complete multicasting information. In multicasting table pruning, the thesis introduced two pruning approaches to reduce the computation complexity and memory requirement. Simulations had been conducted by using NS2 to evaluate the performance. Simulation results confirmed the proposed multicast protocol reduces the energy consumption dramatically, while achieving a high packet delivery rate.
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