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The Scientific World Journal
Volume 2015, Article ID 159245, 6 pages
Research Article

Analysis of Hybrid Buffering and Retransmission in OBS Networks

1ECE Department, Faculty of Engineering, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore 641108, India
2ECE Department, SVS College of Engineering, Coimbatore 642109, India

Received 27 March 2015; Revised 22 July 2015; Accepted 27 July 2015

Academic Editor: Augusto Beléndez

Copyright © 2015 D. Veera Vanitha and M. Sabrigiriraj. 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.


Burst contention is a major problem in the Optical Burst Switching (OBS) networks. Due to inadequate contention resolution techniques, the burst loss is prominent in OBS. In order to resolve contention fiber delay lines, wavelength converters, deflection routing, burst segmentation, and retransmission are used. Each one has its own limitations. In this paper, a new hybrid scheme is proposed which combines buffering and retransmission, which increases the mean number of bursts processed in the system. In this hybrid method, retransmission with controllable arrival and uncontrollable arrival is analyzed. Normally all the bursts reach the first hop and few of them go for second hop to reach destination. After all the bursts reach the destination the server may go for maintenance activity or wait for the arrival of next burst. We model it as a batch arrival single server retrial queue with buffer. Numerical results are analyzed to show the mean number of bursts processed in the system with uncontrollable arrival and controllable arrivals.