ABSTRACT
Recent advances in electronic and computer technologies have paved the way for the proliferation of wireless sensor networks (WSNs). As we have already discussed, the sensor networks usually consist of a large number of ultra-small autonomous devices. Each device, called a sensor node, is battery powered and equipped with integrated sensors, data processing capabilities and short-range radio communications. In typical application scenarios, sensor nodes are spread randomly over the deployment region under scrutiny and collect sensor data. Examples of sensor network projects include SmartDust (Kahn et al., 1999) and WINS (Pottie & Kaiser, 2000).
