Research On Protection Algorithm Supporting Differentiated Service Level In Multiple-domain Optical Networks

Automatic Switch Optical Network(ASON) is usually divided into several routing domainsto strengthen the management of the optical network，improving the performance of routing，supporting the reliability and scalability demand of different service levels，etc. Thus routinginformation of each routing domain only diffuses in each domain， and inter-domains onlyexchanging the converged topological information. In this scenario, all the nodes cannot obtainthe detail topological information of the entire network which makes it difficult to providedifferentiated reliable connections，improving the connection reliability for higher grade service，reducing the failure recovery time for higher grade service, etc. This thesis studied thesurvivability mechanism in multiple-domain optical network with theoretical analysis andnumerical simulation method.This thesis firstly makes a brief introduction on the multiple-domain optical networkprotection technologies, analyzing the key technologies of multiple-domain optical networkprotection. For intra-domain protection scenario，an improved shared path protection algorithm isproposed which introduced the concept of Link load threshold for different quality grades ofservices; For inter-domain protection scenario，an improve protection algorithm by introducingthe weighted coefficient to improve the service level for higher grader service is presented.Theoretical analysis and numerical simulation results show that this improved algorithm can notonly meet the reliability requirements of the different levels of services，but also decrease therecovery time for high-level service simultaneously based on meeting the high resourceutilization of shared path protection algorithm.