Study on preventive congestion control for variable bit rate video traffic

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Study on preventive congestion control for variable bit rate video traffic


Author: Leung, Chi-kwan
Title: Study on preventive congestion control for variable bit rate video traffic
Degree: M.Sc.
Year: 1999
Subject: Asynchronous transfer mode
Integrated services digital networks
Broadband communication systems
Telecommunication -- Traffic
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic Engineering
Pages: iv, 60 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: Asynchronous Transfer Mode (ATM) network supports a diverse mix of traffic sources with different characteristics, different quality of services and at very high speed. In order to provide efficient support, the congestion control of ATM network becomes a crucial issue. Among various type of traffic sources, Variable Bit Rate (VBR) Video, such as Video Conferencing, Video-On-Demand (VOD), is expected to occupy a large portion of network traffic in ATM network. The time-sensitive and unpredictable bursty nature of the VBR Video makes the reactive congestion control, which is a hot topic for Available Bit Rate (ABR) services, may not applicable to VBR Video. On the other hand, the preventive congestion control, which prevents the occurrence of congestion, is more suitable for VBR Video Traffic. Preventive congestion control schemes involve two procedures: connection admission control (CAC) and usage parameter control (UPC). CAC consists of negotiating a new connection request with the users; deciding on admission or rejection of the new connection; allocating the appropriate network resources. Given that a call is admitted, the network protects itself through UPC, which regulate the amount of traffic entering the network. In this project, various congestion control schemes, including the connection admission control (CAC) algorithms and usage parameter control (UPC), proposed in the literature are reviewed. We then based on some existing works to select a congestion control scheme using Equivalent Capacity algorithm and Leaky Bucket mechanism as CAC and UPC respectively. Our simulation results show that, when using VBR video traffic, the performance of the Equivalent Capacity is stable and normally the data lost ratio for the Leaky Bucket can achieve up to 0.9%. We also found that in some situations, the channel bandwidth as agreed by Equivalent Capacity may not be applied directly as the leak rate in the Leaky Bucket, otherwise, data lost ratio will increase dramatically.

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