摘要：
信息中心网络(Information Centric Network,ICN)因其内容分发的高效性,被认为是下一代互联网的原型之一.因此,重点研究ICN网络中可伸缩视频(Scalable Video Coding,SVC)分发中不同缓存策略下的用户体验质量(Quality of Experience,QoE)与成本.一方面,根据ICN网络和SVC视频缓存的特点,设计了一个ICN分层视频分发系统,并建立数学模型对用户体验质量和路由成本进行刻画;另一方面,通过在ndnSIM仿真平台,对不同缓存大小下的Fifo、Lfu、Lru三种替换策略进行比较,结果显示,随着缓存的不断增大,QoE整体呈现上升趋势,成本整体呈现下降趋势.%ICN(Information Centric Network) is regarded as one of the next-generation Internet prototypes for its efficient content distribution. This paper discusses the QoE (Quality of Experience) and cost under different cache strategies for SVC video distribution in ICN network. Firstly, based on the key features of ICN network and SVC video distribution, the ICN ASVC video distribution network is designed, and the mathematical model also constructed, so as to describe the QoE and cost in this system. Then simulation experiments are conducted on ndnSIM simulation platform, thus to compare the performance of different caching strategies, namely, Fifo, Lfu and Lru with different caching sizes. The results indicate that, as the caching size increases the overall QoE tends to increase, and cost to decrease.
