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Identifier uch.csd.msc//1996MST1101
Title Ένα Σύστημα Ελέγχου Ροής της Μεταφοράς www Πληροφορίας σε Δίκτυα TCP/IP
Creator Panteris, Constantinos
Contributor Κ. Κουρκουμπέτης
Abstract WWW enables users to transfer simultaneously different kinds of information (e.g. text, image). Lots of times, users aren't equally interested in all these kinds of the transfered information, without being able to express their preferences. So this results in having data which, although they aren't very important for the user, make network congested and at the same time delay the transfer of data of greater importance. Congestion is an ordinary phenomenon in TCP/IP networks. It comes up from the competition of the connections to increase their transfering rate. The mechanisms implemented to control the congestion (window flow-control, slow-start algorithm) don't use any knowledge about the condition of the network and as a result, many times, they react inaccurately and out of date to conditions of congestion in the network. In this work we try to improve the TCP flow control mechanisms and at the same time enable the user to determine priorities among the different kinds of WWW information he wishes to receive. The flow control system (after receiving the user's preferences from the HTTP protocol) estimates the condition of the network and controls the flow of connections. Basicaly, we aim at reducing the rate of low priority connections drastically (so they don't make the network congested) and increasing - when possible - the transfering rate of high priority connections. In other words, we try to improve the services provided to the user and at the same time prevent non important data (for the user) from leading the network to congestion. We experimented on measuring the performance of different connections and the results were satisfactory. The network traffic was determined according to the priorities set by the user and the performance of high priority connections was significantly improved.
Subject α) Δίκτυα Υπολογιστών και Ψηφιακές Επικοινωνίες, β) Μηχανική Οραση και Ρομποτική
Issue date 1996-11-01
Date available 1997-06-2
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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