Event-driven Wireless Sensor Networks using energy-saving data collection

In Wireless Sensor Networks (WSN) nodes are small battery-powered devices and electric power is difficult to supply after the network is activated. Thus, maximizing life time of the network is one of the most important challenges in wireless sensor networks. Also, nodes are allocated at high density because even if some nodes cannot communicate due to breakdown of devices or decrease in battery, network connectivity needs to be maintained. Thus, some nodes that are allocated proximally tend to obtain the same observation information. If a base station node (BS) collects observation information of events from all nodes that detect events, this is not effective from the point of view of power consumption because of communication between some nodes that have the same observation information. This paper proposes a data collecting method that removes redundant communications of observation information for event-driven wireless sensor networks. Our method, which estimates areas of events by communication between nodes and collects events of observation information of only nodes on the edge of the areas, achieves low-energy consumption.