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In this paper, the authors propose MICRO (MInimum Cost Routing with Optimized data fusion), an energy-efficient routing protocol for event-driven dense wireless sensor networks. The proposed routing protocol is an improvement over PEGASIS, which exploits a new cost function for energy balancing among sensor nodes and uses an iterative scheme with optimized data fusions to compute the minimum-cost route for each event-detecting sensor node. Compared to the previously suggested PEGASIS routing protocol, the MICRO protocol substantially improves the energy-efficiency of each route by optimizing the trade-off between minimizing the total energy consumption of each route and balancing the energy state of each sensor node.
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