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Optical Network Design and Modeling, 2005. Conference on; 02/2005
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ABSTRACT: A fundamental assumption underlying most studies of optical burst switched (OBS) networks is that full wavelength conversion is available throughout the network. In practice however, economic and technical considerations are likely to dictate a more limited and sparse deployment of wavelength converters in the optical network. Therefore, we expect wavelength assignment policies to be an important component of OBS networks. In this paper, we explain why wavelength selection schemes developed for wavelength routed networks are not appropriate for OBS. We then develop a suite of adaptive and non-adaptive policies for OBS switches. We also apply traffic engineering techniques to reduce wavelength contention through traffic isolation. Our performance study indicates that, in the absence of full conversion capabilities, intelligent choices in assigning wavelengths to bursts at the source can have a profound effect on the burst drop probability in an OBS network.
Broadband Networks, 2004. BroadNets 2004. Proceedings. First International Conference on; 11/2004
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ABSTRACT: This paper studies the important fault management issue with focus on the fast restoration mechanisms for optical burst switched (OBS) networks. In order to reduce the burst losses during the restoration process, effective fast restoration schemes are necessary. This is illustrated via two basic fast restoration schemes, the distributed deflection scheme and the local deflection scheme, compared with the slow global routing update mechanism. A novel priority-based QoS restoration scheme is also proposed to provide differentiated restoration services. Through detailed descriptive analysis and a comprehensive simulation study, these fast restoration schemes demonstrate fast restoration process, low fault management overheads, and excellent burst loss performance. As far as we know, this is the first comprehensive study on the restoration mechanisms for OBS networks.
Broadband Networks, 2004. BroadNets 2004. Proceedings. First International Conference on; 11/2004
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1st International Conference on Broadband Networks (BROADNETS 2004), 25-29 October 2004, San Jose, CA, USA; 01/2004
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ABSTRACT: Survivability is a critical network design issue for opti-cal networks since even a single failure for a short duration may result in huge data loss due to the large capacity of optical fibers. However, few studies have been done on this issue for optical burst switching (OBS) networks. In this pa-per, we extend our early work on the fast restoration tech-nique for OBS networks and present a novel fast restoration mechanism based on distributed deflection routing. Com-pared to other survivability schemes, the proposed mecha-nism has the advantage of fast and low-overhead fault man-agement process and demonstrates excellent burst blocking performance by balancing the deflected traffic load during the restoration process.
