A Router-Based Congestion Control Scheme For Real-Time Continuous Media

K. Jeffay, M. Parris, F.D. Smith, and T. Talley
in Network and Operating System Support for Digital Audio and Video,
Proceedings, Sixth Intl. Workshop
Zushi, Japan, April 1996
pages 79-86.

Abstract: Many distributed multimedia applications require real-time network communication services to be effective. Although architectural models for real-time communication on the Internet are evolving (e.g., [2]), none appear to consider the problem of realizing real-time performance on existing local-area networks. This is important as the "first" and "last mile" of a network connection -- the portion from a sending workstation to an Internet-bound router on the originating campus, and the portion from an inbound router to a receiving workstation on the destination campus -- are likely to employ conventional LAN technologies that cannot reliably provide real-time service. We are investigating the problem of congestion control in a campus-area network. We advocate the placement of a set of simple, generic media adaptations into campus routers for the purpose of ameliorating the effects of congestion along the "first/last mile" of a connection. The adaptations and their implementation are designed to complement proposed schemes such as RSVP for real-time communication through the wide-area network. We demonstrate empirically that our router-based congestion control scheme is capable of supporting an effective, best-effort, real-time transmission service across congested campus networks.

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