A burst segmentation-deflection routing contention resolution mechanism in OBS networks |
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Authors: | Guan Ai-hong and Wang Bo-yun |
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Affiliation: | 1. College of Information Science and Engineering, Henan University of Technology, Zhengzhou, 450001, China
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Abstract: | One of the key problems to hinder the realization of optical burst switching (OBS) technology in the core networks is the
losses due to the contention among the bursts at the core nodes. Burst segmentation is an effective contention resolution
technique used to reduce the number of packets lost due to the burst losses. In our work, a burst segmentation-deflection
routing contention resolution mechanism in OBS networks is proposed. When the contention occurs, the bursts are segmented
according to the lowest packet loss probability of networks firstly, and then the segmented burst is deflected on the optimum
routing. An analytical model is proposed to evaluate the contention resolution mechanism. Simulation results show that high-priority
bursts have significantly lower packet loss probability and transmission delay than the low-priority. And the performance
of the burst lengths, in which the number of segments per burst distributes geometrically, is more effective than that of
the deterministically distributed burst lengths. |
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Keywords: | |
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