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In this paper, a Cognitive Radio Network (CRN) model is presented. In this model, the control of the CRN is distributed among the frequency spectrum considered for transmission using Cognitive Pilot Channels (CPCs). This control is performed by using frequency-division and time-division multiplexing techniques. Frequency-division is used to divide the spectrum into predetermined frequency slots in which Cognitive Radio Users (CRUs) communicate. Then, the frequency slots are divided into sub-frequency slots, some of which are defined as CPC and used by the CRUs to communicate with a Central Cognitive Base Station (CCBS) and to determine availability in a frequency slot.
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