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10 October 1997 Providing guaranteed quality of service for variable-bit-rate video at a multiplexor
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Proceedings Volume 3231, Performance and Control of Network Systems; (1997)
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States
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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Abdelnaser Adas and Amarnath Mukherjee "Providing guaranteed quality of service for variable-bit-rate video at a multiplexor", Proc. SPIE 3231, Performance and Control of Network Systems, (10 October 1997);

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