Communications Project

Document Type:Master's Thesis
Name:Elvin Lattis Taylor, Jr.
Title:Modeling and Simulation of a Video-on-Demand Network Implementing Adaptive Source-Level Control and Relative Rate Marking Flow Control for the Available Bit Rate Service
Degree:Master of Science
Department:The Bradley Department of Electrical and Computer Engineering
Committee Chair: Dr. Scott F. Midkiff
Committee Members:Dr. Nathaniel J. Davis, IV
Dr. Charles J. Parry
Keywords:Video-on-Demand, Traffic Management, High-speed Networking
Date of defense:December 18, 1997
Availability:Release the entire work immediately worldwide.


The Available Bit Rate (ABR) service class for the Asynchronous Transfer Mode (ATM) protocol was originally designed to manage data traffic. ABR flow control makes no guarantees concerning cell transfer delay or cell delay variation. A closed-loop feedback mechanism is used for traffic management. To use this class of service for video transport, the video source will accept feedback from the network and adapt its source rate based on this status information. The objective of this research is to assess the ability of the ATM ABR service class to deliver Moving Picture Experts Group version 1 (MPEG-1) video. Three approaches to source-level control are compared: (i) arbitrary loss or no control method, (ii) selective discard of MPEG B-pictures, and (iii) selective discard of MPEG B- and P-pictures. Performance is evaluated based on end-to-end delay, congested queue occupancy levels, network utilization, and jitter. A description of the investigation, assumptions, limitations, and results of the simulation study are included.

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