关键词: 认知无线网, 视频流, 分簇, 服务质量, 图像组

Abstract: Spectrum resource has become increasingly scarce in recent years, and research on cognitive radio networks has attracted much attention. Video streaming has the feature of delay-sensitive and high bandwidth demands, so routing scheme design is challenging. This paper proposes a cluster-based routing method for video streaming in dynamic spectrum environment. Considering the spectrum heterogeneity and dynamic allocation feature, this paper analyzes the optimal scale of clustering to minimize the distortion in transmission, and proposes an importance based cluster-head selection strategy, a spectrum aware multimedia routing algorithm is designed. Simulation experiments show that, the algorithm obtains ideal PSNR for multimedia sources through the cluster-based method, can provide reliable visual effect and Quality of Service （QoS） guarantee.

Key words: cognitive radio network, video streaming, clustering, Quality of Service（QoS）, group of picture