%0 Conference Paper %B Communication Networks and Distributed Systems Modeling and Simulation Conference (CNDS 2002), Riverwalk North, San Antonio, Texas, USA %D 2002 %T Performance Analysis of a Managed Bandwidth Service for ATM Networks %A Christos Bouras %A Vaggelis Kapoulas %A Alexandros Panagopoulos %A Afroditi Sevasti %A Chrysa Chantzi %A Ioanna Sampraku %X 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. %B Communication Networks and Distributed Systems Modeling and Simulation Conference (CNDS 2002), Riverwalk North, San Antonio, Texas, USA %P 220 - 225 %8 27 - 31 January %G eng