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Media Access Control (MAC) layer is a very important layer in Wireless Sensor Networks (WSN) since this kind of network is self organizing and has different priorities than regular networks. Due to limited resources, WSN requires special MAC protocols. This paper helps to explore some WSN MAC protocols and addresses the kind of problems that are solved by these protocols. Wireless sensor networks use a group of autonomous sensors for different purposes in a large variety of applications. Such networks have the ability to be self organized and failure-adaptive to provide an efficient and reliable network that carries the sensed data towards the sink successfully.
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