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Energy consumption is major issue in any type of Wireless Sensor Network (WSN) application. The main concern of this paper is how to increase the lifetime of network in WSN application. In any WSN application, data is measured and the same is sent to the particular destination. So each node is associated with sensors and battery, the lifetime of each node is determined by battery. One of the major issues is to reduce the energy consumption, and it mainly depends on two factors: the transmission range and amount of data transferred. In this paper we classify the WSN application into three types: Hard real-time, soft real-time and periodic applications, then we propose a specific scheme for hard realtime application in order to reduce the consumption of energy and increase the life of a node.