Figure 3: Throughput of particular flows with
implementation of RDM model.
Figure 4: Throughput of particular flows with
implementation of RDM model and Measured Sum
method for VoD traffic.
total packet loss dropped to 15.68%. It is not
necessary to add additional QoS mechanisms,
because we have reached zero losses for the services
with the higher QoS requirements. Admission
control Measured Sum method can be applied also
on VoIP traffic. We have met the QoS requirements
of VoIP by RDM model by dividing of bandwidth
among particular traffic classes.
5 CONCLUSIONS
Internet Protocol networks naturally offer only best-
effort service. Hence, many different QoS
mechanisms for IP networks have been proposed.
We have verified two of these mechanisms for the
multiservice IP network by simulations.
Based on our simulations we have proposed efficient
combination of measurement based admission
control and bandwidth constraint model for QoS
provision for voice, video and data services
transmitted over single IP network.
ACKNOWLEDGEMENTS
This work is a part of research activities conducted
at Department of Telecommunications FEI STU
Bratislava, within the scope of scope of the project
VEGA No. 1/0565/09.
REFERENCES
Ash, J. 2005. RFC 4126 - Max Allocation with
Reservation Bandwidth Constraints Model for
DiffServ-aware MPLS Traffic Engineering, The
Internet Society.
Bohnert, T. 2007. Admission Control for Packet
Newtorks. University of Coimbra, Portugal. Retrieved
December 10, 2008, from
http://tmb.nginet.de/public/ac_lecture.pdf
Chao, J., Gou, X. 2002. Quality of Service in High Speed
Networks, John Wiley & Sons, New York. ISBN 0-
471-00397-2.
Faucheur, F., Lai, W. 2005. RFC 4125 - Maximum
Allocation Bandwidth Constraints Model for DiffServ-
aware MPLS Traffic Engineering, The Internet
Society.
Faucheur, F. 2005. RFC 4127 – Russian Dolls Bandwidth
Constraints Model for DiffServ-aware MPLS Traffic
Engineering, The Internet Society.
Halás, M., Kyrbashov, B., Kováčik, M. 2008. Influence of
encryption on VoIP connection quality. In 9
th
International Conference Research in
Telecommunication Technology 2008, Vyhne, Slovak
Republic, September 10 – 12, 2008, ISBN 978-80-
227-2939-0.
Más, I. 2008. On Admission Control for IP Networks
Based on Probing, Royal Institute of Technology.
Stockholm, ISBN 978-91-7415-012-4.
Medvecký, M. 2007. Performance of BC Models for QoS
provisioning in MPLS. In International Conference
Research in Telecommunication Technology (RTT)
2007. University of Žilina, pp. 245-250, ISBN 978-80-
8070-735-4.
Nevin, A., Jiang, Y., Emstad, P. 2008. Robustness Study
of MBAC Algorithms. In IEEE Symposium on
Computers and Communications (ISCC) 2008. IEEE
Computer Society, pp. 1040 – 1046, ISBN 978-1-
4244-2702-4.
SIGMAP 2009 - International Conference on Signal Processing and Multimedia Applications
188