Abstract
Slotted optical burst switching (SOBS) has recently caught the attention
of the optical networking community due to performance gains achievable with
synchronous infrastructures. In this paper, we study the loss probabilities
in a slotted optical burst switching node fed with Poisson burst traffic
where the fixed burst size is an integer multiple of the slot length. We
develop a discrete-time Markov chain (DTMC) based framework to obtain the
loss probabilities in systems with and without quality of service (QoS)
differentiation. In particular, we focus on analytical modeling of priority
scheduling and offset-based QoS differentiation mechanisms for SOBS
networks. The latter problem suffers from the curse of dimensionality which
we address by a discrete phase type distribution approximation for the
discrete Poisson distribution leading to an accurate approximation for the
loss probabilities. A hybrid QoS mechanism which jointly utilizes
offset-based differentiation together with priority scheduling is also
analyzed.
© 2009 IEEE
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