Scheduled video delivery for scalable on-demand service
NOSSDAV '02 Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video
The Impact of Replacement Granularity on Video Caching
NETWORKING '02 Proceedings of the Second International IFIP-TC6 Networking Conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; and Mobile and Wireless Communications
P2P Object-based adaptivE Multimedia Streaming (POEMS)
Journal of Network and Systems Management
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Multimedia streaming applications consume a significant amount of server and network bandwidth. In this paper we develop transmission schemes (SBatch, UPatch and MPatch) that exploit proxy-based prefix caching to reduce the transmission cost when part or all of the end-end path from the server to the clients is only unicast capable. We consider the problem of allocating a limited proxy buffer to a set of videos with different sizes and popularities. For a fractional caching policy which allows prefix caching, we develop a technique to analytically determine, for a given transmission scheme, the optimal proxy buffer allocation to each video that minimizes the bandwidth cost for the set. Our evaluations show that even a relatively small prefix cache can result in dramatic cost reductions, and that prefix caching significantly outperform policies that cache only entire objects at the proxy. Also proxy cache allocations that are tuned to the cost characteristics of a particular transmission scheme can significantly outperform transmission-scheme agnostic allocations. We find that carefully designed transmission schemes in conjunction with an optimal prefix caching scheme are the key to significant cost reductions over the case of transmitting a video separately to every client, when the end-end delivery path is either entirely unicast capable, or offers multicast only on the proxy-client path.