Research On Routing Technology Based On PCE In Next Generation Optical Network

With the scale development of Automatically Switched Optical Network (ASON), the network topology becomes more and more complicated, and so does the routing computation, consequently, the original routing technology cannot satisfy the requirements of complicated path computation. To resolve the problem, PCE architecture was proposed by the IETF PCE Work Group. The large number of constraint-based path computation problem can be resolved by deploying independent PCE in ASON, which has more significant advantage than the original routing technology especially in the path calculation of multi-domain optical network.Based on next generation optical network technology development in the context of routing, PCE technology development, and gradually mature and standardized. Currently, IETF PCE Working Group had completed a series of related standards and draft. Routing technology especially PCE technology of the next generation optical network was researched in this paper and the main contents were as follows:(1) According to the developing process of the next generation optical network, PCE module including PCE architecture, computing model, PCE discovery mechanism and strategies and so on were studied systematically and comprehensively.(2) PCE computation protocols(PCEP) and the finite state diagrams were both analyzed, and the implementing schemes of PCE path request and reply modules were proposed, besides, the PCEP extensions in optical networks was studied.(3) Study on PCE in the model of routing and wavelength assignment in the next generation optical network. By contrast with the computing algorithm of the common path of multi-domain optical networks and computing method based on PCE, it was shown that PCE combined the information of various inter-domain network resources and mastered the whole network topology, so that it can calculate the optimal path, thus improving network utilization.