Transporting QoS adaptive flows |
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Authors: | Andrew T Campbell Geoff Coulson David Hutchison |
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Affiliation: | (1) Department of Electrical Engineering and Center for Telecommunications Research, Columbia University, New York, NY 10027-6699, USA; http://www.ctr.columbia.edu/˜campbell , US;(2) Department of Computing, Lancaster University, Lancaster LA1 4YR, UK; e-mail:{geoff,dh}@comp.lancs.ac.uk , GB |
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Abstract: | Distributed audio and video applications need to adapt to fluctuations in delivered quality of service (QoS). By trading
off temporal and spatial quality to available bandwidth, or manipulating the playout time of continuous media in response
to variation in delay, audio and video flows can be made to adapt to fluctuating QoS with minimal perceptual distortion. In
this paper, we extend our previous work on a QoS Architecture (QoS-A) by populating the QoS management planes of our architecture
with a framework for the control and management of multilayer coded flows operating in heterogeneous multimedia networking
environments. Two key techniques are proposed: i) an end-to-end rate-shaping scheme which adapts the rate of MPEG-coded flows
to the available network resources while minimizing the distortion observed at the receiver; and ii) an adaptive network service,
which offers “hard” guarantees to the base layer of multilayer coded flows and “fairness” guarantees to the enhancement layers
based on a bandwidth allocation technique called Weighted Fair Sharing. |
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Keywords: | : Scalable flows – Multimedia transport – Dynamic QoS management – end-to-end QoS architecture |
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