Multi-band Routing for Ad-hoc Cognitive Radio Networks

In this paper, we propose a novel multi-band routing method for cognitive radio using ad-hoc networks. The cognitive radio is considered being used for the secondary radio systems under the frequency bands assigned to the primary systems. In order to realize such systems, the method for minimization of giving interference toward the primary systems is required. As one of the solution for the inter-system interference, multi-hop communication networks with small transmit power of each terminal have been considered. In cognitive radio systems, we can use multiple frequency bands for communication. However, these bands are also used by the primary systems so the link quality is often changed. In such situation, the routing is complicated for establishing the reliable multi-hop communication. Therefore, in this paper, we consider the stable routing method suitable for multi-hop cognitive networks with small power by using multi-band for improving the performance of the secondary cognitive networks.