Minimizing losses in max-min fair-share OBS networks

Preemption is one of the most effective ways to achieve fair bandwidth allocation in OBS networks. Preemption allows ingress edge switches to transmit the traffic of flows over their fairly allocated bandwidth but core switches drop over-used traffic when there is contention. This paper proposes a rate-fairness preemption combined with deflection routing (RFP-DR) scheme to provide service isolation and protection among flows according to the max-min fair bandwidth allocation and minimize total loss probability in OBS networks. Our deflection routing (DR) technique aims to decrease loss probability while preserving the definition of max-min fairness. In addition, our DR can also be applied to rate control approaches. Our simulation results prove that our proposed combination of RFP and DR works well in terms of preserving max-min fair-share and minimizing loss.