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传统的视频点播系统为每个点播用户分配单独的静态通信通道,其系统资源利用率低的缺点使得总体时间段上能并发的点播用户数少。针对网管可控的宽带校园网环境,文章提出了一个采用自适应动态缓存的组播策略,它通过差别服务(Diffserv)比例带宽分配机制保证了一定的视频播送服务质量(QoS),并基于服务端综合调度和客户端回馈的方法动态调整各视频流的播送速度,从而优化了系统整个过程的整体资源利用率,提高了系统的点播性能。
The traditional VOD system allocates a separate static communication channel for each on-demand user. The disadvantage of low utilization of system resources makes the number of on-demand users concurrent over the entire time period less. In view of the network management environment of a broadband campus network, this paper proposes a multicast strategy using adaptive dynamic caching, which guarantees a certain quality of video transmission QoS through the proportional service bandwidth allocation mechanism, End integrated scheduling and client feedback dynamically adjust the video streaming speed, thus optimizing the overall system utilization of the overall resource utilization and improve on-demand system performance.