The Research Of Multi-Fault Localization And Flexible Nework Optimization Mechanism In Pce-Based Multi-Domain Large Capacity Optical Transport Networks

The all-optical transport network is responsible for the long-distance, steady and transparent transmission, due to the key position of the all-optical transport network in the entire telecommunication network system. And the viability of all-optical network has already become a crucial measure. There are many intra-domain and inter-domain link failures and these may occur at any time and any position, especially in high-volume, large-scale all-optical transport network,. These complex faults give a big challenge to the viability of the network. In general, the network fault monitoring units detect a link failure and locate the position, then generate information packets and transmit them to the fault management center. This thesis focuses on how to apply a more complete fault protection and recovery mechanism to increase the viability of network.A PCE architecture is standardized by the Path Computation Element Working Group of Internet Engineering Task Force. The architecture is required to apply to inter-domain path computing based on of MPLS and GMPLS traffic engineering Label Switched Path. In particular, PCE architecture has solved the remarkable problem for all operators nowadays, known as the multi-fault localization mechanism for inter-domain link failures. Based on the architecture, the thesis discusses an PCE inter-domain multi-link failure location mechanism and extends PCEP protocol to support the optimization strategies of elastic light wavelength resource allocation. In addition, the thesis designs an universal inter-domain routing flooding method for the multi-domain optical network of large capacity.The main innovation points of the thesis are listed as follows:1. The thesis puts forward a stateful PCE multi-link failures localization mechanism using fuzzy fault set theory, which is broadly implemented in multi-domain optical networks of large capacity. The innovative localization mechanism has high scalability, speed and success rate compared with exsiting LVM protocol.2. The thesis perfects the global optimization method which applies in flexible grid optical network.3. The thesis puts forward an intro-domain routing flooding method, which is not limited to detailed routing implementation protocol, in order to save flooding information package traffic in multi-domain large capacity network.