Radio Resource Management between Two User Classes in Cognitive Radio Communication

Making use of spare radio resource to complete communication for secondary user under the constraint that not interrupting the communication of primary user is an important issue in cognitive radio communication. A coexistence window is proposed in this paper inside which the primary user and secondary user share the radio channel in time division manner. The access performance of the secondary user with window length varying is analyzed, while maintain the priority of primary user. Two concepts, connectivity probability and link utility efficiency, are defined to measure the performance of secondary user. They are evaluated with the window length varying, and the results show that there is an tradeoff between them. Considering the practical noise channel, we studied how the metrics change, and the data rate of the secondary user in this case is obtained.