VoD on steroids: Optimized content delivery using distributed video servers over best-effort Internet

  • Authors:
  • Gerassimos Barlas

  • Affiliations:
  • Department of Computer Science, School of Engineering, American University of Sharjah, P.O.B. 26666, Sharjah, United Arab Emirates

  • Venue:
  • Journal of Parallel and Distributed Computing
  • Year:
  • 2005

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Abstract

This paper addresses the problem of delivering a long-duration continuous media document, typically a movie, over unreliable communication links like the ones that make up the Internet. Packet loss/drop is one of the main problems that plague Internet's use for offering multimedia services. The framework presented here addresses analytically this problem by offering closed-form solutions for partitioning and scheduling the delivery of a document by multiple spatially distributed servers. The goal is to offer uninterrupted playback to clients while minimizing their access-time. The solid mathematical foundation presented, enables the study of multi-server document delivery using unreliable communications for both CBR and VBR media. It is also shown how slow connections that would otherwise prevent the deployment of Movie-on-Demand class services, could be used to offer such services in an optimal manner. The paper also addresses the problem of optimally arranging the available servers. A rigorous simulation study that explores the potential of the proposed approach concludes the paper. Our simulations show a super-linear speedup in access-times and also the robustness of the proposed scheme, capable of handling unknown network conditions by shifting server ''load''.