Dynamic Fuzzy Controlled RWA Algorithm for IP/GMPLS over WDM Networks

This paper proposes a dynamic RWA scheme using fuzzy logic control on IP/GMPLS over WDM networks to achieve the best quality of network transmission. The proposed algorithm dynamically allocates network resources and reserves partial bandwidth based on the current network status, which includes the request bandwidth, average utilization for each wavelength and its coefficient of variance (C.V.) of data traffic, to determine whether the connection can be set up. Five fuzzy sets for request bandwidth, average rate and C.V. of data traffic are used to divide the variable space: very large (LP), large (SP), normal (ZE), small (SN), and very small (LN). Setting the fuzzylimit is a key part in the proposed algorithm. The simulation ofscenarios in this paper has two steps. In the first step, the adaptivefuzzy limits are evaluated based on average transmission costpertaining to ten network statuses. The second step is to compare theproposed algorithm with periodic measurement of traffic (PMT) in ATMnetworks in six network situations to show that the proposed FC-RWAalgorithm can provide better network transmission.