The key to developing practical application with Cognitive Radio is a greater awareness of the spectrum and how it’s currently being used. A thorough monitoring of the spectrum over a period of time (say weeks and months) will create a database of date/time/frequency stats that can be used to more reliably predict the future use of the spectrum. In this article
paints a picture of a world in which all spectrum users rely on cognitive radio techniques to find and use spectrum without much regard for pre assignment.
Part of the solution is to develop devices and practices that cooperate with each other. In other words all devices on the network should check the spectrum and monitor it so it can share spectrum cooperatively.