An energy-aware routing for cognitive radio ad hoc networks

In cognitive radio ad hoc networks (CRAHNs), because mobile devices are mainly powered by battery, efficient consumption of energy is a key problem to be improved. In this paper we study how to find an energy efficient route for a session in CRAHNs. We propose a relative energy metric for routing in CRAHNs, and develop two relay users selection methods for CRAHNs, one of which is proactive and the other is reactive. The new routing scheme could select proper relay nodes, channels, and transmitter power for a session, aims to supply enough communication rate, to decrease the average total power consumption of each session, and to prolong the life of the total network at the same time. In addition, we compare the performance of a proactive route scheme with that of reactive method. Numerical results show that the effectiveness of our proposed routing scheme is with good generalization ability, and the reactive node selection method may better satisfy CRNs.