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Proceedings Paper

Providing guaranteed quality of service for variable-bit-rate video at a multiplexor
Author(s): Abdelnaser Adas; Amarnath Mukherjee
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Paper Abstract

Network support for variable bit-rate video needs to consider (1) properties of workload induced (e.g., significant autocorrelations into far lags and heterogeneous marginal distributions), and (2) application specific bounds on delay-jitter and statistical cell-loss probabilities. The objective of this paper is to present a quality-of-service solution for such traffic at each multiplexing point in a network. Heterogeneity in both offered workload and quality- of-service requirements are addressed. A per-virtual-circuit framing structure and a pseudo earliest-due-date cell dispatcher are introduced to provide guaranteed delay-jitter bounds. Heterogeneous jitter-bounds are supported through software controlled frame-sizes which may be independently set for each virtual-circuit. The framing structure is a generalization of per-link framing introduced by Golestani. The proposed framing structure eliminates correcting for phase mismatches between incoming frames and outgoing frames, necessary in per-link framing. This results in reduction in end-to-end delay bound, buffer requirements, and a simpler implementation. Strong auto-correlations typically seen in video traffic make equivalent bandwidth computations for heterogeneous cell-loss bounds intractable. To address this, the framing strategy is combined with an active cell-discard mechanism with prioritized cell- dropping, the latter utilizing the history of dropped cells and target cell-loss bounds for each virtual circuit. Upper bounds on the equivalent bandwidth needed to support a given workload with a target quality of service are also given. These are validated through numerical and simulation results from variable bit-rate MPEG-I video traces.

Paper Details

Date Published: 10 October 1997
PDF: 13 pages
Proc. SPIE 3231, Performance and Control of Network Systems, (10 October 1997); doi: 10.1117/12.290406
Show Author Affiliations
Abdelnaser Adas, Rockwell International and Georgia Institute of Technology (United States)
Amarnath Mukherjee, Tandem Computers and Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3231:
Performance and Control of Network Systems
Wai Sum Lai; Hisashi Kobayashi, Editor(s)

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