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作者： Xiaolong Yang Keping Long Qianbin Chen Yujun Kuang Yun Li Sheng Huang Special Research Centre for Optical Internet and Wireless Information Networks (COIWIN) Chongqing University of Posts & Telecommunications 400065 Chongqing China

＜正＞The burst contention has a strong impact on the performance of optical burst switching （OBS） network, and currently, various contention resolution schemes have been proposed. Among them, the deflection routing is more attractive due to its looser requirement for optical buffer in capability and quantity. However, due to their unreasonable deflection controls, its conventional versions （i.e., directly drop, unconditional deflection, and limited deflection） possibly have less effect on resolving contentions when the traffic load increases. Therefore, this paper proposes the tunable-parameter deflection routing （TPDR） algorithm, which consists of the definition of a tunable-parameter （i.e., deflection probability） to control the deflecting of contending bursts, and the nonlinear programming to search the optimum deflection path in terms of the burst loss probability （BLP） and the path length. The simulation results show that it can improve the overall BLP and the BLP of each individual priority, and alleviate the offset-time deficit on QoS guarantee.

关键词： Optical Burst Switching (OBS) Contention deflection routing deflection Probability QoS

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A Burst Segmentation-deflection routing Contention Resolution Mechanism Based on Priority in Optical Burst Switching Networks

A Burst Segmentation-deflection routing Contention Resolutio...

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中国光学学会2011年学术大会

作者： Aihong Guan,Boyun Wang College of Information Science and Engineering,Henan University of Technology,Zhengzhou,Henan 450001,People’s Republic of China

In order to guarantee quality of service（QoS） of different priority bursts and effectively reduce the packet loss probability（PLP）,a burst segmentation-deflection routing contention resolution mechanism based on priority in optical burst switching networks is proposed in this *** the core node,contention is resolved through incorporating prioritized burst segmentation with deflection routing *** burst segmentation scheme allows the head of contending bursts or the tail of original bursts to be *** segmented burst is scheduled on the optimum deflection path by deflection routing *** analytical model is proposed to evaluate the contention resolution scheme through calculating PLP and the normalized end-to-end *** show that high-priority bursts have significantly lower PLP and delay than *** the contention resolution scheme which incorporate burst segmentation with deflection routing tends to perform better than the scheme only with burst segmentation or deflection routing.

关键词： Optical communications Optical burst switching(OBS) Contention resolution Burst segmentation deflection routing Quality of Service(QoS)

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