Research And Simulated Implementation Of Integrated Flexible QoS Routing Mechanisms In IP/DWDM Optical Internet

Expanding Internet services are driving the need for evermore bandwidth in the network backbone. Dense Wavelength Division Multiplexing (DWDM) technology can exploit enormous transport capacity, meeting such a demand for bandwidth. While DWDM has been traditionally used just to increase the transport capacity in point-to-point networks, which leads the networks to weak scalability, expensive cost, complex operation and low efficiency. New emerging applications require the networks to support fast and flexible provisioning, multiple levels of Quality of Service (QoS), optical rerouting and fast restoration. Furthermore, the architectural complexity of the networks has to be reduced in order to save costs and ease their management. In this context, the IP/DWDM optical Internet which runs IP directly over the DWDM layer to eliminate one or more of intermediate layers (e.g., SONET/SDH, ATM) is expected to be the right solution.Routing problem is one of the key technologies in networks. In consideration of unicast, homogeneous and heterogeneous multicast, integrated flexible QoS routing mechanisms in IP/DWDM optical Internet are proposed in this paper. Based on the Generalized Multiprotocol Label Switching (GMPLS) framework, the proposed routing mechanisms can combine different flows dynamically, introducing grooming function to increase the resource utilization. In order to support flexible QoS, fuzzy method is adopted, and to consider both network service providers and users, microeconomics and game theory are used to achieve "double win". Due to their NP-complete nature, Quantum Genetic Algorithm and Bacterial Colony Chemotaxis Algorithm are uesed respectively. And wavelength assignment algorithms are embedded. Hence, routing and wavelength assignment can be solved integratedly.To evaluate the performance of the proposed routing mechanisms, simulation software has been designed and developed. Lots of simulation studies have been done, and the results have shown that the proposed routing mechanisms can solve the routing problems in IP/DWDM optical Internet efficiently and effectively.