Optimal Prefix Caching and Data Sharing strategy

It requires an enormous amount of media server and network resources for on-demand delivery of video objects to a large number of clients with high start-up latency and packet loss ratio. An effective solution is to deploy a streaming proxy server close to client to cache media streaming data. In this paper, we propose an integral and scalable data sharing scheme, Optimal Prefix Caching and Data Sharing (OPC-DS), which combines prefix caching and interval caching in the proxy cache. In OPC-DS, the sizes of the appropriate prefix cache and interval cache are calculated according to the current request distribution. It can reduce the average start-up delay experienced by users as well as assure that the major of requests can share the data in the proxy buffer. So, utility of the proxy resources can be improved, and the resources consumption can be reduced significantly for the media server and back-bone network bandwidth by using it. Experimentally comparing with several existing methods, OPC-DS achieves significant performance improvement.