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Title: Alternative control strategies for ensuring quality of service in private ATM networks
Author: Lam, H.-Y. K.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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Existing private networks support voice and data services only. Next-generation networks, however, will need to support a much wider set of services such as desktop videophony and videoconferencing. The bandwidth management techniques used with existing networks are too rigid to support these new services in an efficient way. Hence, to meet this need, a new type of integrated services network has been proposed. This is based on the asynchronous transfer mode (ATM) of operation and provides a much more flexible transmission and switching system for the newer services involving compressed video and other media types. Using the ATM mode of operation, all information is first converted into a standard format comprising multiple fixed-length units known as cells. The cells relating to different calls are then switched in a uniform way and, for transmission purposes, are statistically multiplexed together thus providing a much more flexible bandwidth management scheme. Because of its mode of operation, however, ATM can lead to cell-loss and cell delay variation which, for services involving video, can lead to a degradation in the quality of service of such calls. The objective of the research reported in this thesis therefore has been to investigate alternative control algorithms for use in such networks which ensure the desired quality of service for various call types is maintained. A number of investigations have been carried out which collectively contribute to existing research in this area. These include: (i) a detailed study to quantify the bandwidth allocation that is required for individual types of traffic based on their performance requirements; (ii) an investigation into rate-based flow control mechanisms in order to prevent any misbehaved users creating network congestion. (iii) a detailed comparison of a number of the priority control algorithms that have been proposed; (iv) the development of a new dynamic priority control scheme for use in such networks.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available