Energy-Efficient QoS Based Route Management in Cognitive Radio Networks

In this paper QoS based route management technique is proposed for Cognitive radio networks. Proposed model makes use of functionalities of profile exchange mechanism and location services. The QoS routing algorithm contains following elements: (a) each licensed user (PU) exchanges properties of the channels it owns with a Central Entity, whereas all the unlicensed users (SU) in the network due to cognitive functionality sense the environment to obtain identification information of its neighboring nodes and channel present between them. All unlicensed users share this information with Central Entity, (b) Central Entity with the help of received information and location services, and for different QoS levels supported by the network, prepares routes for all the SUs in the network to reach every other SU as its destination. Different Quality of Service metrics considered include power transmission, probability of channel availability, probability of PU presence, and Expected Transmission Count. The proposed model provides a route with minimum end-to-end transmission power, high probability of channel availability, low probability of PU presence and low value of expected transmission count, to increase life span of users in the network by selecting energy efficient route, to decrease the delay, to stabilize wireless connectivity and to increase the throughput of the communication, respectively, based on the QoS level requested by a secondary user.