@article{Zalesky2007Stabilizing,
author = {A. Zalesky and H. L. Vu and Z. Rosberg and E. W. M.
Wong and M. Zukerman},
title = {Stabilizing deflection routing in optical burst
switched networks},
journal = {IEEE Journal on Selected Areas in Communications},
volume = {25},
number = {6},
pages = {3-19},
month = {Aug.},
year = {2007},
abstract ={This paper studies the blocking performance of optical burst switching (OBS)
networks using a sequential office control (SOC) state-independent deflection
routing policy. We show that unprotected deflection routing may destabilize OBS
resulting in higher blocking probabilities than if bursts were not deflected but
simply blocked. This study was motivated by the well-known destabilizing effect
that alternative routing has on circuit switching in classical telephony
networks. We propose two forms of protection to guard against destabilization:
1) wavelength reservation, which is analogous to trunk reservation in circuit
switching; and, 2) preemptive priority, which is a new form of protection where
bursts that have not been deflected are given preemptive priority over bursts
that have been deflected. Our main contribution is a one-moment reduced-load
approximation to evaluate the blocking performance of OBS networks using
deflection routing protected by either wavelength reservation or preemptive
priority. Our reduced-load approximation relies on the usual assumptions of link
independence and Poisson distributed link arrivals. We quantify the error
admitted in making these two assumptions via simulation. Using our reduced load
approximation, we evaluate the blocking performance of protected and unprotected
deflection routing in several randomly generated networks. The chief conclusion
of our study is that deflection routing in OBS should be given some form of
protection to avoid destabilization resulting from upward load variations, and
in terms of blocking performance, preemptive priority is the best form of
protection for OBS. We use simulation to verify that our conclusions remain
valid for a realistic traffic scenario.}
}