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中文摘要：
提出了一种基于主动网络的视频分级传输方案（SVM-AN）.服务器、客户端以及部署在网络中间的主动节点构建了分级多播结构,原始视频流在服务器端进行分级压缩与标记,客户端根据自身网络情况和处理能力申请合适的视频流,中间主动节点利用其处理能力过滤掉优先级较低的部分视频流,以满足异构网络用户对视频质量的不同需要.与接收端驱动的分层多播（RLM）方案的对比仿真结果表明：SVM-AN方案提供更稳定的带宽、端到端时延以及更小的分组丢失率,为接收端提供稳定的视频回放质量,也提高了网络的总体利用效率.
英文摘要：
A scheme of scalable video multicasting using active networks （SVM-AN） is proposed,in which server, clients and the intermediate nodes within the active networks construct a scalable multicast architecture. Raw video streaming is scalable compressed and marked at the server. Clients subscribe suitable video streaming according to their network bandwidths and processing capacities. Using the processing capacity of intermediate nodes within the active network, SVM-AN filters out part of video stream with lower priority to adapt to different video quality requirements for heteroge- neous network users. Compared with receiver-driven layered multicast （RLM）, the simulation results show that the SVM-architeeture, which improves overall network utilization efficiency, provides more stable bandwidth, end-to-end delay, smaller packet loss rate, and more stable video playback quality requirements for heterogeneous network users.
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