Performance issues of bandwidth management in ATM networks

TitlePerformance issues of bandwidth management in ATM networks
Publication TypeJournal Article
Year of Publication2003
AuthorsBouras, C, Kapoulas, V, Panagopoulos, A, Sevasti, A, Chantzi, C, Sampraku, I
JournalInternational Journal of Communication Systems, Wiley InterScience, Volume 16, Issue 2
Pagination 151 - 169

In our days, efficient management of the available network resources becomes a critical issue, both from a
functional point of view (so that users can be provided with the bandwidth they need), and an economical
point of view (so that carriers can satisfactorily and efficiently serve as many customers as possible and at
the same time increase their revenue). In this paper we consider a bandwidth control scheme (i.e. managed
bandwidth service) for an ATM network infrastructure which is applied to the Greek research and
technology network (GRNET). We present some methods that we have tested (in a simulation setting) in
order to increase the efficiency of the system and the utilization of the available bandwidth. More
specifically, we consider a bandwidth-resizing algorithm for virtual paths, in order to keep the allocated
bandwidth very close to the bandwidth actually used. This leads to an increased number of accepted
requests and better network utilization. We, also, use the simulation results in order to get an estimation of
the effective bandwidth for VBR paths that can be used in call admission. Finally, we consider a semioffline
scheme where requests are gathered and considered for acceptance in regular intervals. Simulation
results show an increase in the utilization of resources. As a further improvement, we allow connections to
be allocated a little before or after the time initially requested. This leads to further improvement in
network utilization. All the improvement schemes were tested with the ATM-TN simulator and the results
look promising.