Service Differentiation in Optical Burst Switching Networks

At the beginning of the new millenium several trends can be observed in the field of communications networks. First, bandwidth requirement in networks seems to grow without limits. IP (Internet Protocol) based data networks play a central role. This is not only due to the fact that data traffic has surpassed voice traffic but even more due to the exponential growth rate of IP traffic volumes. Second, more and more users and applications request QoS (Quality of Service) mechanisms from today’s communication networks. Third, optical technology continues to provide an exponential growth at higher rate than IP traffic growth in fiber transmission capacities. In this paper, we will elaborate on these trends and show how they motivate optical burst switching(OBS) as a new switching paradigm for future transport networks. We start with an overview of the evolution of photonic and IP networks, and classify OBS with respect to switching paradigms. Section 2 surveys the definition and design parameters of OBS. In Section 3, different proposed reservation mechanisms are introduced and compared in a scenario where no classes are distinguished. Section 4 describes an analysis for the burst loss probabilities with JET for arbitrary offset values. Finally, in Section 5 a detailed discussion of the performance in a two-class OBS node is presented.

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