Physical Impairment Aware Virtual Optical Network Construction Algorithm with Service Differentiation in Elastic Optical Networks

摘要

Background: Elastic optical networks can support high data bit rates efficiently with itsflexible wavelength grid, and with virtual optical networks, network resources can be managed simply.However, the signal may be deteriorated by the physical impairments. Therefore, service differentiationtechniques have to consider the physical impairments.Objective: We propose a novel virtual optical network construction algorithm that provides servicedifferentiation. Moreover, the effect of physical impairments is considered before constructing a virtualoptical network. The goal of the proposed algorithm is to provide service differentiation interms of the rejection rate of virtual optical network requests. Here, we consider the on-line scenariowhere the traffic is not known in advance.Method: In the proposed method, each virtual optical network comprises two nodes and a lightpathbetween the two nodes. In our proposed method, service differentiation is provided by giving a higher(lower) acceptance rate for high (low) priority users. This method consists of four mechanisms;signaling mechanism, physical impairment estimation mechanism, resource check mechanism, andretransmission mechanism.Numerical Results: We evaluate by simulation the performance of the proposed method in NSFNETand European topologies. Analysis of the rejection rate as function of network load, impact of thenetwork load on the number of retransmissions, and impact of network topology were discussed.Numerical results show that our method not only provides service differentiation but also reduces theoverall rejection rate.Conclusion: We can conclude that our method is efficient compared to the conventional methodsconsidering the scenario and topologies analyzed.