Dynamic RWA scheme using fuzzy logic control (FLC RWA) on IP with GMPLS over DWDM networks

The tremendous capacity of WDM networks with IP should be optimized to carry traffic for Internet applications. Moreover, a new technique called generalized MPLS (GMPLS) is developed for combining all network technologies including ATM, SONET/SDH, TDM, and DWDM. The standard of GMPLS is established by IETF. In the framework of GMPLS, a virtual path must be set up before packets are delivered. The routing and wavelength assignment (RWA) algorithm efficiently manages optical network resources and the RWA problem is separated from the optical topology. This paper proposes a dynamic FLC RWA scheme using fuzzy logic control on IP with GMPLS over DWDM 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 fuzzy limit is a key part in the proposed algorithm. The simulation of scenarios in this paper has two steps. In the first step, the appropriate Fuzzy Limits are evaluated based on simulation results pertaining to six network statuses. The second step is to compare the FLC RWA algorithm with periodic measurement of traffic (PMT) in ATM networks in six network situations to show that the proposed FLC RWA algorithm can provide better network transmission.