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Proceedings Paper

Analysis of combined voice/data/video operation in cable and DSL access networks: graceful degradation under overload
Author(s): Gagan L. Choudhury
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Paper Abstract

We develop exact models to analyze the performance of several types and grades of data, voice and video sessions over a cable or DSL based access network. Each session is characterized by a minimum guaranteed data-rate and a maximum allowed data-rate. Sessions would normally transmit at the maximum rate but under congestion some or all sessions would see graceful rate degradation. For each class the blocking probability and the average data-rate attained by a session are computed. In addition, a system-wide probability of rate degradation is also computed. A bufferless model with product-form structure and insensitivity to session holding time distribution except through mean (heavy-tailed distributions are allowed), and a buffered model with standard Markov chain structure are developed. The models are also generalized to allow rate degradation of real-time streaming traffic (e.g., switch from G.711 to G.728 encoding or turn on silence suppression) whenever the total bandwidth usage exceeds a certain threshold. Whenever a model is sensitive to session holding time distribution, that sensitivity is studied through simulations.

Paper Details

Date Published: 24 July 2001
PDF: 12 pages
Proc. SPIE 4523, Internet Performance and Control of Network Systems II, (24 July 2001); doi: 10.1117/12.434311
Show Author Affiliations
Gagan L. Choudhury, AT&T Labs. (United States)


Published in SPIE Proceedings Vol. 4523:
Internet Performance and Control of Network Systems II
Robert D. van der Mei; Frank Huebner-Szabo de Bucs, Editor(s)

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