Spectrum sharing optimization with QoS guarantee in cognitive radio networks

•A spectrum-sharing scheme based on the Hungarian Algorithm is proposed to meet the QoS for heterogeneous applications.•The demands (data rate, error rate, etc.) of CRs are collected from cell-controllers and logged on a network-controller.•The channels are shared based on weighted objective function considering the demands of users and the quality of channels.•The weights of objective functions depend on the requirements such as throughput enhancement, error control or stability.

In this paper, we propose an optimized spectrum sharing scheme based on the Hungarian Algorithm to guarantee the quality of service (QoS) for individual cognitive radio (CR) users belonging to different CR cells. The proposed scheme is most favorable for overlapping cells where the users are demanding channels for heterogeneous applications such as chatting, web browsing, or voice and video streaming. The spectrum sharing optimization with the QoS guarantee (SSO-QG) is an optimal scheme that can operate in throughput enhancement mode, high reliability mode and collision avoidance mode based on the weight assigned to the corresponding QoS parameters in accordance with the demands of different applications. Simulation results show that the proposed scheme outperforms the existing schemes in terms of forming the optimal sharing pattern and meeting the stringent QoS requirements fairly enough according to the demands of the cell. Moreover, it reduces collisions with primary users.

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