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A QoS-guaranteed adaptive cooperation scheme in cognitive radio network

Abstract:

The benefits of network layer cooperation cognitiveradio networks have been gradually recognized in recent years. In this paper we consider the network layer cooperation incognitive radio network, whereby primary users select somesecondary users to relay packets, in return for more favourablespectrum access rules for secondary users. Under this cooperationscheme, we investigate how to enlarge the throughput of the wholenetwork, where a QoS(Quality of Service)-guaranteed adaptivecooperation scheme is developed. Our scheme can guarantee theQoS demand of primary users and update its frequency divisioncooperation scheme dynamically according to the status of nodes. Our algorithm requires knowledge of only instantaneous queuelengths at secondary nodes and the pbkp_redictable end-to-end delay. Simulation results reveal that our proposed scheme significantlyoutperforms previous works in terms of throughput.