Abstract
Time synchronization for wireless sensor networks (WSNs) has been studied in recent years as a fundamental and significant research issue. Many applications based on these WSNs assume local clocks at each sensor node that need to be synchronized to a common notion of time. Time synchronization in a WSN is critical for accurate time stamping of events and fine-tuned coordination among the sensor nodes to reduce power consumption. This paper proposes a lightweight tree structured time synchronization approach for WSNs based on reference nodes. This offers a push mechanism for (i) accurate and (ii) low overhead for global time synchronization. Analysis and comparative study of proposed approach shows that it is lightweight as the number of required broadcasting messages is constant in one broadcasting domain.KeywordsReference NodeTree Structure TopologyTime SynchronizationWireless Sensor Network
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