Analysis of combined voice/data/video operation in cable and DSL access networks: graceful degradation under overload

Gagan L. Choudhury

doi:10.1117/12.434311

24 July 2001 Analysis of combined voice/data/video operation in cable and DSL access networks: graceful degradation under overload

Gagan L. Choudhury

Author Affiliations +

Proceedings Volume 4523, Internet Performance and Control of Network Systems II; (2001) https://doi.org/10.1117/12.434311
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

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.

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Gagan L. Choudhury "Analysis of combined voice/data/video operation in cable and DSL access networks: graceful degradation under overload", Proc. SPIE 4523, Internet Performance and Control of Network Systems II, (24 July 2001); https://doi.org/10.1117/12.434311

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