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Journal of Applied Sciences
Year: 2007  |  Volume: 7  |  Issue: 20  |  Page No.: 3057 - 3062

On the Resource Allocation in Optical Burst Switching Networks

A. Abid, F.M. Abbou and H.T. Ewe    

Abstract: Optical Bursts Switching (OBS) is a flexible yet efficient photonic switching paradigm. However, due to their one-way resource reservation mechanism, OBS networks experience high bursts (thus packets) loss rate. In OBS networks, the contention is resolved either by dropping one of the contending bursts, or more efficiently by dropping from one of the contending bursts only the parts that overlap with the other burst. In both situations, only one data source will suffer the data loss in favor to the other. In this study a simple yet effective network resource allocation algorithm is presented. With this algorithm, the dropped segments are selected evenly from both contending data bursts. Furthermore, the truncated data bursts (forwarded or deflected) are guaranteed to be larger than the minimum burst-length allowed by the network specification. Additionally, the algorithm is demonstrated to be practical if used in a mechanism to provide differentiated services to IP packets over an OBS network. A simulation is used to evaluate the performance of the algorithm.

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