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Energy efficiency is one of the most important requirements for wireless sensor networks. The authors present EMAC, an energy efficient MAC protocol for low-traffic delay-tolerant wireless sensor networks. EMAC uses asynchronous distributed transmission scheduling to achieve high energy efficiency. It was developed following strict design guides and keeping focus on meeting all requirements of MAC protocols designed for wireless sensor networks. It was implemented using TinyOS. Real world measurements of EMAC running on Crossbow's mica2 motes were done, and are compared to S-MAC and B-MAC.
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