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F.Z. Khan, M.F. Hayat, G. Franzl:
"Service differentiation via preemptive wavelength conversion in optical burst switched networks";
Talk: 7th International Conference on Frontiers of Information Technology (FIT2009), Abbottabad, Pakistan; 12-16-2009 - 12-18-2009; in: "Proceedings of 7th International Conference on Frontiers of Information Technology (FIT2009)", ACM digital library, (2009), ISBN: 978-1-60558-642-7; Paper ID 410, 6 pages.

To avoid optical buffering, wavelength conversion has been widely investigated to handle potential burst collisions in the optical domain. The objective of this study is to propose a new scheme to achieve proportional quality-of-service in optical burst switched networks that use wavelength conversion for contention resolution. In OBS, wavelength converters may be available to each channel, may be shared per link, or shared per node, according to the node architecture. Due to the cost of wavelength converters, sharing is commonly preferred. With shared converters all except one of the contending burst switching demands are assigned available converters from the pool to change their outgoing wavelength, solving contention. We propose a flexible preemption based mechanism to achieve service differentiation among different classes based on accessibility to converters in the pool. An analytical model is presented to prove that the proposed mechanism effectively provides service differentiation for multi-class traffic in terms of blocking probability.

To avoid optical buffering, wavelength conversion has been widely investigated to handle potential burst collisions in the optical domain. The objective of this study is to propose a new scheme to achieve proportional quality-of-service in optical burst switched networks that use wavelength conversion for contention resolution. In OBS, wavelength converters may be available to each channel, may be shared per link, or shared per node, according to the node architecture. Due to the cost of wavelength converters, sharing is commonly preferred. With shared converters all except one of the contending burst switching demands are assigned available converters from the pool to change their outgoing wavelength, solving contention. We propose a flexible preemption based mechanism to achieve service differentiation among different classes based on accessibility to converters in the pool. An analytical model is presented to prove that the proposed mechanism effectively provides service differentiation for multi-class traffic in terms of blocking probability.

Optical Burst Switching, Quality of Service, Contention Resolution, Preemption Schemes, Tunable Wavelength Converters

Project Head Slavisa Aleksic:
BONE: Aufbau von zukünftigen optischen Netzen in Europa