关键词: 无线传感器网络, 自供能, 最优分簇数, 分簇算法, 模糊控制

Abstract: The existing energy harvesting Wireless Sensor Network (WSN) clustering algorithms rarely consider the optimal number of clusters of the network, which leads to excessive network energy consumption and uneven energy consumption across the entire network. To solve this problem, a fuzzy control based energy harvesting WSN clustering algorithm was proposed, namely Energy Harvesting-Fuzzy Logic Clustering (EH-FLC). First, a solar energy replenishment model was introduced into the network energy consumption model, and the function relationship between total energy consumption of the network and the number of network clusters was obtained for each round. The function was derived to obtain the optimal number of clusters of the network. Then, the two-level fuzzy decision system was utilized to assess whether the nodes of the network can become cluster head nodes. The residual energy of the node and the number of adjacent nodes were input into the first level (capability level) as the judgment indexes to filter all the nodes in order to obtain the candidate cluster head nodes. And the centrality parameter and proximity parameter were input into the second level (collaboration level) as the judgment indexes to filter the candidate nodes in order to obtain the cluster head nodes. Finally, the performance indexes of the proposed algorithm such as network life cycle, network energy consumption and network throughput were analyzed through Matlab simulation. Compared with the algorithms of Low Energy Adaptive Clustering Hierarchy (LEACH), Wireless sensor networks non-Uniform Clustering Hierarchy (WUCH) and Cluster head selection using Two-Level Fuzzy Logic (CTLFL), the proposed algorithm has the network working life improved by about 1.4 times, 0.4 times and 0.6 times respectively, and the network throughput increased by about 20 times, 1.5 times and 1.28 times respectively. Simulation results show that the proposed algorithm has better performance in network life cycle and network throughput.

Key words: Wireless Sensor Network (WSN), energy harvesting, the optimal clustering number, clustering algorithm, fuzzy control