@conference {2780, title = {Performance Analysis of a Managed Bandwidth Service for ATM Networks}, booktitle = {Communication Networks and Distributed Systems Modeling and Simulation Conference (CNDS 2002), Riverwalk North, San Antonio, Texas, USA}, year = {2002}, month = {27 - 31 January}, pages = { 220 - 225}, abstract = {In this paper we are considering methods to improve the performance of a bandwidth control scheme (i.e. Managed Bandwidth Service) for an ATM network infrastructure (with application to the Greek Research and Technology Network - GRNET). These methods try to increase the efficiency of the system and the utilisation of the available bandwidth. More specifically, we consider: a) a bandwidth-resizing algorithm for virtual paths in order to (constantly) keep the allocated bandwidth very close to the bandwidth actually used, b) a simple method to estimate the effective bandwidth for VBR paths that can be used in call admission, and c) a semi-offline call admission scheme where requests are gathered and considered for acceptance in regular intervals (with a further improvement, of allowing connections to be allocated a little before or after the time initially requested). All these methods were tested in a simulation setting (with the ATM-TN simulator), and results indicate that they lead to an increased number of accepted requests and better network utilisation.}, author = {Christos Bouras and Vaggelis Kapoulas and Alexandros Panagopoulos and Afroditi Sevasti and Chrysa Chantzi and Ioanna Sampraku} }