A Review on Energy Efficient Communication in Cognitive Wireless Sensor Networks

Nowadays, Wireless Senor Networks faces the problem of spectrum unavailability as it has to share spectrum with contemporary technologies like Bluetooth, Wi-Fi etc. To overcome this problem Cognition is added in Wireless Sensor Networks which results in Cognitive Wireless Sensor Networks. The sensor nodes in Cognitive Wireless Sensor Networks have a spectrum sensing capability which gives an opportunity to an Unlicensed user to transmit in the licensed band whenever the spectrum have not been used by Licensed user. In other words, Cognitive Wireless Sensor Networks deals with the problem of spectrum unavailability. Spectrum Sensing and similar parameters decays the lifetime of the sensor nodes which in turn decreases the efficiency of sensor nodes. This review paper shows the way that how an energy efficient communication in Cognitive Wireless Sensor Networks can be modeled. Various parameter effects the lifetime of the sensor nodes. Probable solutions like energy harvesting and energy efficient routing will be discussed for increasing the life time of the sensor nodes. Future challenges and research areas for developing an energy efficient communication system for Cognitive Wireless Sensor Network are also discussed.