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Wireless Sensor Networks (WSN) is an emerging area of research in the field of wireless communication. WSN applications include environmental monitoring, industrial process monitoring and target detection and tracking in an enemy terrain and many more. Though it has wide range of application domain, the basic constraint i.e. the power constraint of WSN still remains a challenge and a potential field of research. MAC layer protocols play an important role in energy conservation. Being affected by the physical layer and providing services to the upper layer, many MAC protocols has been proposed for the smooth operation and to help reduce energy utilization in WSN.
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