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Proceedings Paper

Efficient video multiplexing for delay-sensitive sources based on leaky-bucket characterization
Author(s): Ayman Ali-Maher Ibrahim; Maher Hamdi; Pierre Rolin
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Paper Abstract

We are concerned about the transmission of delay-sensitive Variable Bit Rate Video (VBR) MPEG-2 sources over the Asynchronous Transfer Mode (ATM) networks. VBR sources allow the use of statistical multiplexing in the network to improve bandwidth utilization. In order to allow for an efficient multiplexing in the network, video sources must be well characterized in order to provide a precise estimation of the network resources needed by the source to achieve quality of service (QoS) requirements. The VBR-rt transfer capability defined by the ATM forum and the ITU-T uses two couples of leaky-bucket parameters as traffic descriptors for the VBR traffic: (the Peak Cell Rate, and CDVT) and, (the Sustainable Cell Rate, the Intrinsic Burst Tolerance). In previous works, we have shown that these traffic descriptors are too conservative and could allow only a very poor network utilization. We have also shown that an efficient multiplexing of VBR video sources could be achieved if the source rate distribution is modeled by a Gamma distribution characterized by the source mean rate and variance. We present in this paper an algorithm that allows the translation of the leaky-bucket parameters into the mean rate and variance needed for efficient video multiplexing. Therefore, for a source controlling its rate to be compliant with the leaky bucket parameters, the corresponding maximum rate variance could be estimated thus allowing a more efficient video multiplexing while maintaining QoS requirements.

Paper Details

Date Published: 22 January 1999
PDF: 12 pages
Proc. SPIE 3528, Multimedia Systems and Applications, (22 January 1999); doi: 10.1117/12.337398
Show Author Affiliations
Ayman Ali-Maher Ibrahim, Ecole Nationale Superieure des Telecommunications (France)
Maher Hamdi, Swiss Federal Institute of Technology (Switzerland)
Pierre Rolin, CNET (France)

Published in SPIE Proceedings Vol. 3528:
Multimedia Systems and Applications
Andrew G. Tescher; Bhaskaran Vasudev; V. Michael Bove; Barbara Derryberry, Editor(s)

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