QoE-Driven Channel Allocation Schemes for Multimedia Transmission of Priority-Based Secondary Users Over Cognitive Radio Networks
With the fast growing of multimedia communication applications, cognitive radio networks have gained the popularity as they can provide high wireless bandwidth and support quality-driven wireless multimedia services. In multimedia applications such as video conferences over the cognitive radio, the Quality of Experience (QoE) that directly measures the satisfaction of the end users cannot be easily realized due to the limited spectrum resources. The opportunistic spectrum access Cognitive Radio (CR) is an efficient technology to address this issue. However, the unstable channels allocated to the multimedia Secondary Users (SUs) can be re-occupied by the Primary Users (PUs) at any time, which makes the CR difficult to meet the QoE requirements.