Coverage Problem in Wireless Sensor Networks

Sensor network are highly distributed networks of small light weighted wireless nodes deployed in large numbers to monitor the environment or system by the measurement of physical parameters such as temperature, pressure, light, vibration, humidity etc. Wireless sensor node consists of sensing, computing, actuation, communication and power component. An efficient method to extend sensor network lifetime by organizing the sensors into a maximal number of set cover thet are activated successively. Only the sensors from the current active set are responsible for monitoring all targets and for transmitting the collective data, while all other nodes are in low-energy sleep mode. By using different technique we increase the network lifetime.