The Research Of Gmpls-Based Physical Parameters Coordination Mechanism

With the rapid growth of IP business, the integration of IP and optical network has been an inevitable development trend of Next Generation Optical Networks. ASON (Automatic Switching Optical Network) is precisely a result of Optical Transport Network becoming intelligent, which achieves automatic allocation of resources and dynamic connection in Optical Network by bringing into control plane. GMPLS (General Multi-Protocol Label Switch) protocol is the core technology of realizing ASON control plane.The optical signal may face degradation of performance in the long-distance transmission of transparent network. The degradation can be characterized as some physical damage parameters. At present, the existing GMPLS-based control plane only considers the network resources but ignores the physical damage of the transport plane during the connection establishment process, hence usually leading to the successful optical path of the control plane but the connection of the transport plane is failed. Therefore we need a control plane and transport plane coordination mechanism that can consider physical damage.In this thesis, we propose a novel GMPLS-based physical parameters coordination mechanism, which mainly includes physical parameters distribution and physical-parameters-based RWA (Routing and Wavelength Assignment) algorithm. For the physical parameters distribution, two distribution mechanisms have been put forward, which are respectively SPD (Signalling-based Physical parameter Distribution) based on RSVP-TE protocol and APD (Advertisement-based Physical parameter Distribution) based on OSPF-TE protocol. For the RWA, by using BER (Bit Error Ratio) as a main assessment of physical parameters, we propose a BSD-RWA (BER-based Source-node Dynamic RWA) algorithm which can take BER into consideration when computing routes.The simulation of the proposed mechanisms is conducted on the GLASS network simulation platform. The simulation results show that the proposed APD&(BSD-RWA) mechanism and SPD&(BSD-RWA) mechanism applies to40wavelength and80wavelength division multiplexing equipment in the existing network; the established connection can effectively avoid the wavelength channel of high BER value, blocking possibility is generally less than the original mechanism; APD&(BSD-RWA) obtain the best performance which delivers reduction of blocking probability compared to the original mechanism. Both APD&(BSD-RWA) and SPD&(BSD-RWA) improves the success rate of the established connetcion.