MOS-Based Channel Allocation Schemes for Mixed Services over Cognitive Radio Networks

In cognitive radio (CR) networks, secondary users (SUs) may have various applications such as multimedia delivery and file download, resulting in different bandwidth requirements. In this paper, we propose a channel allocation scheme for mixed services, especially video streaming, based on mean opinion score (MOS) maximization. MOS is an effective metric of Quality of Experience (QoE) that directly measures the satisfaction of the end users. The cognitive radio network base station (CRNBS) collects all the SUs' application information and allocates available channel resource to the SUs with the overall user perceived MOS maximized and fairness among SUs ensured. The simulation results confirm that the proposed MOS-based channel allocation scheme outperforms the conventional good put-based scheme in terms of overall user satisfaction.