| Networked micro-sensor technology is a key technology for the future. It has been identified as one of the most important technologies for the 21st century and is regarded to revolutionize information gathering and processing in applications (Heinzelman et al., 1999). Advances in Micro-Electro-Mechanical Systems (MEMS) and low-power integrated digital electronics have inspired the development of micro-sensors (Sohrabi, 2000). Such sensors are generally equipped with date processing, communication, and information collecting capabilities. They can detect the variation of ambient conditions in the environment surrounding the sensors and transform them into electric signals. Interests in sensor networks have motivated intensive research in the past few years emphasizing the potential of cooperation's among sensors in date collecting and processing, coordination and management of the sensing activity, and date flow to the sink. Wireless Sensor Networks (WSNs) is one of the architecture of sensor networks. WSN can be formed by sensors in an ad-hoc manner. It belongs to the general family of sensor networks that use multiple distributed sensors to collect information on entities of interest. |