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by A. Hafid, G. V. Bochmann
http://www.iro.umontreal.ca/labs/teleinfo/TRs/P982.ps.gz
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Abstract:
Abstract: Emerging high-speed networks and powerful end-systems give rise to a new class of applications, such as video-on-demand and teleconferencing. Such applications are very demanding on Quality of Service (QoS) because of the isochronous nature of media they are using. To provide QoS support in an end-to-end basis, the need for the integration of network, transport and operating services arises. Thus to support the new emerging services, QoS guarantees are required. However, even with service guarantees exceptions may occur because of resources shortage, e.g. short time congestion. Hence, protocols for QoS adaptation must be provided to deal with QoS violation. In this paper we propose adaptation protocols that allow to recover from QoS violation (1) by redistributing the levels of QoS that should be supported, in the future, by the components, (2) by renegotiating a degraded QoS with the applications that accept varying QoS, or (3) by redistributing the levels of QoS that should be supported immediately to meet end-to-end requirements based on the principle that QoS violation at one component may be recovered immediately by the other components participating in the communication. The proposed protocols allow (1) to reduce the probability of QoS violation, and (2) to increase the system availability.
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Bochmann is a professor at the University of Montreal since 1972 and holds the Hewlett-Packard-NSERC-CITI chair of industrial research on communication protocols. He is also one of the scientific directors of the Centre de Recherche Informatique de Montre
– Gregor
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