Table of Contents
Journal of Photonics
Volume 2013, Article ID 515074, 5 pages
Research Article

DQOBSR Protocol with QoS Provisioning for OBS Metro Rings

1Department of Electronics and Communication Engineering, Pondicherry Engineering College, Puducherry, India
2Department of Electronics Engineering, School of Engineering and Technology, Pondicherry University, Puducherry, India

Received 28 April 2013; Revised 10 August 2013; Accepted 11 August 2013

Academic Editor: Haroldo Hattori

Copyright © 2013 M. Thachayani and R. Nakkeeran. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Optical burst switching (OBS) is the switching technology that enables optical internet with current technology. OBS networks are capable of operating with or without optical buffers and wavelength converters. Hence, medium access control (MAC) protocol plays an important role in resolving contention in such networks. Distributed Queue OBS Ring (DQOBSR) is one MAC protocol proposed for OBS ring networks. In this paper, the quality of service (QoS) provisioning scheme for DQOBSR protocol is presented. For the proposed protocol, service differentiation for different classes of traffic in terms of throughput and access delay is verified through simulation. A mathematical model is also presented for the computation of classwise mean access delay. The results obtained using the model are found to be in good agreement with the simulation results.