Performance Evaluation of RWA Algorithms in ASON Resiliency Mechanisms for Better Resource Utilization and Service Performance Quality

This research work proposes a solution to employ a Routing and Wavelength Assignment (RWA) algorithm that can utilize network resources efficiently with better service performance quality in dynamic Automatically Switched Optical Network (ASON) service provisioning. It conducts blocking probability and network availability comparison simulations for the widely used adaptive RWA algorithms of Shared Risk Group (SRG)-Disjoint Aware First-Fit Routing, Alternate Routing, Least Congested Routing and Load Sharing Routing algorithms coordinated with First-Fit wavelength assignment algorithm, in 1+1 Dedicated Path Protection (DPP) and Restoration. The simulations are conducted on Net2Plan simulation tool using ethio telecom’s Addis Ababa Metro Backbone Optical Transport Network (OTN) as reference topology. The results show that, for both Protection and Restoration, the Alternate Routing and Least Congested Routing algorithms are competently better in blocking probability performance. The network availability of the Alternate Routing is found to be better in both protection and restoration schemes.