Design, modeling and optimization using hybrid virtual topology for QoS provision over all-optical switched networks

Abstract

All-optical switched networks (AOSN), mainly optical label switching (OLS), guaranteed fast data transfer QoS support and network resource supervision. However, the emergence of new applications and services, having variable and various requirements, are produced new demands, notably in terms of QoS support and resource control. To meet these demands, a hybrid virtual topology (HVT), with multiple core node architectures employing wavelength converters (WC), fiber delay line (FDL), and deflection path (DP), is proposed. This HVT enables various node architectures to manage the availability and usage of the components, covering fixed, limited, and full range converters (FXWC, LRWC, and FRWC) also FDL. An advanced DP improves signaling and switching to supervise the potential HVT and AOSN resources while assuring QoS support. A lightpath cost is formulated to determine the potential lightpaths utilized to build the HVT guaranteeing AOSN resources and advanced traffic management. The obtained results of the conducted simulation and comparative study show that the optimized (O-HVT) approach performed better than the enhanced (E-HVT) and initial (I-HVT) approaches. Moreover, the O-HVT method optimizes AOSN resources, mainly core node architecture range, while providing QoS support for high load traffic with variable demands.