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Wireless Sensor Networks (WSNs) consist of a large number of small, low data rate and inexpensive nodes that communicate in order to sense or control a physical phenomenon. The major difference between the WSN and the traditional wireless network is that sensors are very sensitive to energy consumption. Moreover, the performance of the sensor network applications highly depends on the lifetime of the network and the authors expect the lifetime of several months to several years. Thus, energy saving is crucial in designing long-lived wireless sensor networks.
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