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Time synchronization in Wireless Sensor Networks (WSN) is important for accurate time stamping of events and fine-tuned coordination of duty cycles to minimize power consumption. This paper presents a novel Chained-RIpple Time Synchronization (CRIT) protocol that is fast, flexible, and high-precise in WSN. CRIT adopts hierarchical and multi-hop time synchronization architecture with supporting energy-saving problem in WSN. The algorithm works in two phases. In the first phase, a horizontal structure between Missionary Nodes (MN) is established in the network by Piggy-Back Neighbor Time Synchronization (PBNT) algorithm. In the second phase, a vertical structure between a MN and Sensor Nodes (SN) is set up in each Sensor Group (SG) by Distributed Depth First Search (DDFS) algorithm.
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