Group Coordination Support in Networked Multimedia Systems
California univ santa cruz Department of computer engineering, 1999 - Computer networks - 334 pages
Advances in computer hardware and networking technology have incited the deployment of large-scale group-oriented applications for delivery or interactive development of multimedia content in the Internet. There is a growing number of protocols and techniques for group communication and membership services in the IP-multicast framework, however, group coordination support for telecollaborative tasks such as videoconferencing or distributed interactive simulation has received little attention. In this dissertation, we address network control and coordination functions to orchestrate synchronous multimedia groupwork, establishing a sharing discipline on multimedia resources and guaranteeing consistency of distributed activities with ordered multicasting. We introduce a formal framework for group coordination and a turn-taking abstraction useful for evaluating coordination protocols. Elemental design choices for group coordination architectures and the concept of aggregated processing of coordination information are discussed.
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activity applications architecture assigned assume audio average average path length branching factor centralized collaborative systems communication concurrency control conferencing consistency control messages coordination protocols CSCW delivery denotes depicted distributed distributed interactive simulations efficacy end-to-end Figure floor control mechanism floor control protocols floor holder floor requests floor token group coordination groupware groupwork HGCP hosts implemented integrated interaction Internet IP multicast labels LORAX MBONE membership message cost metagroup middleware multicast group multicast support multicast tree multiple networked multimedia systems node operation ordered multicast packets paradigms policies prefix propagation Prototypical queue real-time receiver set reliable broadcast reliable multicast protocol remote scalability schemes semantics sender sequence number shared resources shared workspace solutions specific station symmetric synchronization taxonomy telecollaboration telepresence timeline timestamp token passing total order transmission turn turn-taking unicast updates user interface WYSIWIS