A QoS-guaranteed Adaptive Cooperation Scheme in Cognitive Radio Network

The benefits of network layer cooperation cognitive radio networks have been gradually recognized in recent years. In this paper we consider the network layer cooperation in cognitive radio network, whereby primary users select some secondary users to relay packets, in return for more favourable spectrum access rules for secondary users. Under this cooperation scheme, we investigate how to enlarge the throughput of the whole network, where a QoS(Quality of Service)-guaranteed adaptive cooperation scheme is developed. Our scheme can guarantee the QoS demand of primary users and update its frequency division cooperation scheme dynamically according to the status of nodes. Our algorithm requires knowledge of only instantaneous queue lengths at secondary nodes and the predictable end-to-end delay. Simulation results reveal that our proposed scheme significantly outperforms previous works in terms of throughput.