Packet video transport in ATM networks with single-bit feedback |
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Authors: | Hemant Kanakia Partho P Mishra |
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Affiliation: | (1) AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ, USA, US |
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Abstract: | The promise of a broadband integrated service digital network has led to the design of mechanisms for efficient transport
of real-time compressed video in packet switching networks. We examine feedback control for video transport in ATM networks
where the available feedback is a single bit of information carried in the cell header. We investigate the performance of
three single-bit schemes for source rate adaptation. Two were originally for congestion control of bursty data traffic and
are modified to control video traffic. The third scheme conveys more information about
the state of queue(s) at the bottleneck. The simulation results show that all three schemes for feedback control of VBR video
streams work remarkably well. During severe network congestion, the signal quality degrades gracefully, but not uniformly
across all connections. Based on insights from the initial simulations, we propose a scheme to improve the fairness of service
and demonstrate its effectiveness. |
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Keywords: | :ATM networks feedback control – Video traffic real-time compressed – Video VBR – Video traffic fairness |
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