A Fuzzy LSP Regulator forPreemptionControl inaDiffServ-AwareMPLS Internet

Abstract This paper describes a proposal for a fuzzylogic LSP regulator for preemption control in a DiffServ-aware MPLS Internet network based on the Russian Dollbandwidth allocation scheme. The fuzzy logic regulator regulates the incoming traffic based on class by eitherrerouting or resizing existing less prioritized traffic orrejecting the admission request. Three DiffServ traffic classtypes were used in the DiffServ-aware MPLSnetworkunderstudy, i.e. premium, assured and best effort traffic. Thefuzzylogic regulator uses the premium traffic utilization value, theassured and best effort traffic amount of borrowedbandwidth information as inputs and the preemption decisionas output. Asimulation study was performed for the fuzzylogic regulator using ns-2. A comparative analysis wasconducted with preemption, no preemption and with fuzzylogic regulator preemption. The results show that the fuzzylogic pre-emption scheme gave better performance in termsofconnection blocking probability andthroughput.Index