Design and Implementation:An Algorithm Supporting VCR Functions by Extended Steam Merging
支持VCR功能的扩展流合并算法VCRSM的设计与实现

As an effective means of VOD service,multicast has been researched for about ten years. Many algorithms of it have been matured. But there are only a few papers about multicast schedule supporting VCR functions. The rea- son is that supporting VCR functions will increase the complexity of schedule of the server,and will decrease its capa- bility. In this paper,we present a rnulticast scheduling algorithm VCRSM provding VCR functions by extended stream merging. Active buffer management on client is used to partly satisfy the VCR actions of users. On server,original stream merging is modified to adapt to all VCR requests. We also put forward delay request to optimize the server's performence. When compared with other systems in simulation,VCRSM can satisfy all kinds of VCR functions with no delay,while occupying no more bandwidth than others.