Movable Rendezvous Channel Selection for Distributed Cognitive Radio Networks

Cognitive Radio (CR) technology has emerged as a suitable technology for providing a possible solution to the lack of the spectrum problem. For this, CR has to identify opportunistically and heuristically the available spectrum, in which primary users (PUs) do not exist on it. It is critical that the secondary users (SUs) use the vacant portions of the spectrum without causing a loss of efficiency for PUs and without any interference effects on PUs in CR networks. Among the recent research on CR MAC protocols, we focused on the selection of rendezvous channel (RC), which is the core of the Cognitive MAC (C-MAC) protocol. In this paper, we propose a new RC selection scheme that can always maintain only one RC at a certain time. The design and performance of our scheme is presented and evaluated in this paper.