In WSN, for composite event detection some protocol sends all the sensed data to the sink for further processing which causes huge data exchange, unnecessary network traffic and energy consumption. This reduces the energy level of the battery powered sensor nodes and it is often very difficult to change or recharge batteries for these nodes. In most of event monitoring scenarios, users only want to know the event of interest rather than all the events sensed by the sensors. So the sensor should forward a single decision packet corresponding to event of interest rather than forwarding for all. Thus reduced data volume minimizes overall energy consumption of the nodes in the wireless sensor network. To handle these issues, this composite event detection protocol take decision cooperatively among the sensor nodes and only one decision packet is forwarded to sink with sleep-awake policy. This reduces power consumption of the nodes. Further the decision packet is routed such that the node which has maximum battery power and which is closest to sink will be selected as the next hop. This minimizes the rate of failure of link due to node failure thus improved life time of the network and efficient use of energy is achieved.

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Wireless Sensor Network Composite Event Detection Sleep-awake Policy