CoopStream: A cooperative cache based streaming schedule scheme for on-demand media services on overlay networks

Recently, we have witnessed a tremendous growth of in-terests in streaming continuous media such as video data over the Internet. However, how to provide true on-demand streaming services with VCR functionality is still a chal-lenging task, especially when their scalability is required. In this paper, we propose CoopStream, a novel streaming scheme, to address this challenge in the context of over-lay networks. At the client side, we propose to use a dual-channel cache management mechanism to dynamically ad-just the cache contents based on its current playing state, so as to support VCR operations locally. On the server side, we exploit the temporal relationship among asynchronous streaming requests to schedule streams. This enables us to reduce significantly the server load by redirecting streaming requests to the clients that can serve those requests. Simula-tion results show that, CoopStream is capable of providing continuous streaming services that are scalable in terms of the server bandwidth consumed. 1