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Long-term data gathering with Wireless Sensor Networks (WSNs) requires drastic optimization of power consumption to provide a long system lifetime, especially for battery operated motes. In this paper, the authors discuss Harvester, a low power data collection application that leverages recent advancements over the standard MAC and network layer components provided by the TinyOS-2.x operating system. More specifically they contribute an energy saving strategy based on a per-hop synchronization mechanism on the MAC layer. Their open-source implementation achieves over 70% energy savings over the standard LPL layer currently provided by TinyOS.
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