Reliable cluster-based common channel setup method for DSA CR networks

Due to the increasing demands for spectrum resource, a method for the efficient use of frequency for wireless communications is required. In dynamic spectrum access, secondary users (SUs) temporary use the frequency when the licensed spectrum is not occupied by the primary users. To exchange control and data messages between SUs, common channels between them should be established first. In the most of previous cognitive radio ad-hoc network researches, it is assumed that there exists a predetermined common channel. However, in real environments, it has some problems such as jamming attack and traffic concentration on the dedicated common channel. In this paper, we propose a cluster-based reliable dynamic common channel setup method for ad-hoc DSA networks. Without any predetermined channel, we dynamically setup common channels based on the each node´s channel availability. In the simulation, performance of the proposed method in terms of response failure rate, setup delay and cluster join probability is evaluated.