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A Wireless Sensor Network (WSN) is composed of small, low cost and low energy consumption devices called sensors. Those sensors are deployed in a monitored area. They capture measurements related to the monitored phenomenon (temperature, humidity...) and send them through a multi-hop routing to a sink node that delivers them to a Base Station for use and decision making. WSN are used in several fields ranging from military applications to civilian ones, for security, home automation and health care. Up to now, most of the works focused on designing routing protocols to address energy consumption issue, fault tolerance and security.
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