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The network service should provide QoS as well as high reliability. However the past research in wireless sensor networks is not enough to implement QoS, because its limited resources of sensor node. In general, the energy efficient consumption is one of the most important issues in wireless sensor networks. So, in this paper the authors propose the QoS aware energy efficient clustering & routing scheme in wireless sensor networks. According to the performance evaluation using NS-2, the proposed scheme increases the average network lifetime about 2.47times longer than the existing schemes.
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