A New Hybrid Delivery Scheme for Efficient Video-on-Demand Services

In video-on-demand (VOD) system, a periodic broadcast technique like fast broadcasting scheme has been shown to be very effective for serving a popular video in reducing the demand on server bandwidth. A reactive server transmission approach like patching scheme is more suitable for the video that is not popular enough. However, these approaches are not suited for the instance that the level of demand on a video changing greatly with time. In this paper, we propose a novel adaptive hybrid delivery scheme which allocates adaptively transmission resources according to the varying client request rate. The scheme tries to dynamically search the optimal number of channel assigned to the video by the newly updated request rate so as to minimize the bandwidth requirement. Simulation results show that the scheme improves the performance of VOD service significantly in terms of total server bandwidth requirement