Streaming Media Delivery with Proxy Cache for Heterogeneous Clients

Efficient streaming media delivery scheme used multimedia service can largely increase system service ability by reducing the resource requirement. Because of the heterogeneity in the underlying network environments, streaming media delivery scheme should provide different, appropriate video quality to serve clients with different bandwidth. In this paper, we present an efficient streaming media delivery scheme with the aid of proxy caching to delivery layered encoded video for heterogeneous clients. The threshold-based multicast technique is used to delivery video streams form server to proxy via backbone network. In order to reduce the bandwidth requirement of the backbone network, we develop an effective approach to determine which layers of which videos should be cached according to the request rates. A simple and efficient replacement algorithm is presented to deal with the varying request rates. Simulation results demonstrate that our scheme achieve significantly bandwidth reduction