Design and simulation analysis of an integrated network for rail systems

Pao Yue-kong Library Electronic Theses Database

Design and simulation analysis of an integrated network for rail systems


Author: Lau, Po-hon
Title: Design and simulation analysis of an integrated network for rail systems
Degree: M.Sc.
Year: 2000
Subject: Railroads -- Data processing
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic and Information Engineering
Pages: ix, 80, [35] leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: In railway, information transport is needed for train traffic control, passenger information, ticket distribution and validation, train and line maintenance, and administration in order to provide safe, accident-free operation as well as facilitating the punctual and reliable management of train movements. To meet these requirements and provide a cost-effective network infrastructure, it is envisaged that an integrated network is needed to provide such information transport services to the modem railway signalling, control and communications systems, rather than to build dedicated networks for individual rail systems which are costly and difficult to manage and maintain. As such, this project is to investigate and discuss various aspects of network planning, design and performance evaluation for today's railway integrated network. This project presents a realistic model for rail systems traffic that takes into account of both the operational and network constraints. A combination of star-mesh network configuration based on ATM technology is proposed. Having defined the network infrastructure, topology, technologies, and specified the behaviour of traffic models, the second part of the project is to simulate the network model with data traffic from rail systems under four different scenarios. The first scenario represents a healthy network under normal operation environment. The second scenario is to simulate where two ATM backbone switches are failure at core locations. The third scenario is to simulate when two routers are failure at two different stations and the fourth scenario is to simulate the network under heavy traffic loads. The purpose of these simulations is to ensure and verify that a robust high resilient network has been designed such that failure of any network equipment would not affect the overall network performance. Results of the network simulation are then tabled in various performance metrics such as delay, utilisation, and throughput. The simulation is proved to be useful to facilitate the understanding of the network behaviour in a probabilistic data traffic environment which is not possible for an analytical computation. The results clearly indicate that the proposed network design is fully complied with the specified operational and functional requirements by all rail systems.

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