Service differentiation by preemptive wavelength conversion in optical burst switched networks

  • Authors:

  • Farrukh Zeeshan Khan;Muhammad Faisal Hayat;Gerald Franzl

  • Affiliations:

  • Vienna University of Technology, Vienna, Austria;Vienna University of Technology, Vienna, Austria;Vienna University of Technology, Vienna, Austria

  • Venue:
  • Proceedings of the 7th International Conference on Frontiers of Information Technology
  • Year:
  • 2009

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Abstract

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 multiclass traffic in terms of blocking probability.