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Cognitive radio and UWB technologies are new radio designs philosophies in order to optimize the spectrum utilization by exploiting the unused and the under-used spectrum in dynamically changing environments. Although the contrasting philosophies of cognitive radio and UWB technology gains can be made by merging these two technologies. In this paper we propose a cognitive radio based on two MAC protocols which work in a cooperative manner. The first is a MAC UWB protocol for control information transmission, while the second is a MAC protocol for narrow or large band traffic transmission (which depend on the primary user physical implementation). We prove then by analyzing the No real time and the real time Markov chains the efficiency of the CS-OFDMA with pre-reservation access protocol to decrease the Forced termination probability and to increase the throughput of cognitive nodes.