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Wireless Sensor Networks (WSNs) have emerged as an interesting research area in the last few years. The applications envisioned for such networks require collaborative execution of a distributed task amongst a large set of sensor nodes. The collaborative execution is realized by exchanging messages that are time - stamped using the local clocks on the nodes. Hence, time synchronization becomes indispensable in such distributed systems. For years, protocols such as Network Time Protocol (NTP) have kept the clocks of networked systems in perfect synchronization. However, wireless sensor networks have a large density of nodes and very limited energy resource at every node which leads to improved scalability requirements while limiting the resources.
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