Date Added: Mar 2012
A Wireless Sensor Network (WSN) is a network composed of distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions such as temperature, sound, vibration, pressure, motion or pollutants at different locations. WSNs have a wide range of applications in object tracking, object localization, habitat observation, health monitoring and battlefield sensing among others (She et al., 2009). Sensor nodes send their collected data to a determined node called Sink. The sink processes data and performs appropriate actions. Nodes using routing protocol determine a path for sending data to sink. WSNs have inherent and unique characteristics compared with traditional networks.