A Dynamic Scheduling Algorithm for Streaming Media Based on the Cache Window and Segment Patch Pre-fetching
基于缓存窗口和段补丁预取的流媒体动态调度算法

A novel dynamic scheduling algorithm for mobile streaming media based on the cache window and segment patch pre-fetching is proposed. It employs the scheme that the cache window size can be increased or decreased adaptively according to the popularity of the requested object and the patch bytes that are segmented and cached. The principle is obeyed that the data cached for each mobile streaming media object are in proportion to their popularity at the proxy server. Simulation results show that this strategy is more adaptive than conventional algorithm for the variety of the request arrival rates. It can significantly reduce patching data through patching channel under the circumstance of the same maximum cache space. This can effectively reduce the server load and network bandwidth usage on backbone link. It can faster cache the media object than P 3 S 2 A algorithm. It reduces the average occupied cache space at the proxy.