Routing Optimization Of Optical Transport Network Based On Services

With the rapid growth of type and quantity of modern communication network services, transmission of information has a great influence on people’s production activities and daily life. Routing optimization method aimed at improving the reliability of communication network have earned widespread attention. Services of electric power communication network are very important for The safe and stable operation of the grid,and that failure in electric power communication network would causes severe loss.it is significant meaningful to research the routing optimization of electric power optical transport network.Optical transport network (OTN) technical standards, the development and key technologys are introduced in the paper.And that the characteristics of services of electric power optical transmission network are analyzed,including reliability requirements, quality of service(QoS)and so on. On the basis of former analysis,two methods for routing optimization are proposed, the introduction of survivability technology and design of virtual topology.For the dynamic services, the shared protection algorithm for differentiated services is proposed.The number of O/E/O conversion is regarded as delay index.For different services,link costs are set differently. Several times of O/E/O conversion is tolerable for services that are insensitive for time delay,avoiding occupying paths with short delay.As a result,block rate of services with strict requirements for delay is reduced.Besides, Utilization of protection resource,of which is taken advantage preferentially when computing backup path,is improved. Simulations show the advantage of this method.For the static services, the routing optimization algorithm based on co-evolution and chaos genetic algorithm(CCGA) in power communication network is proposed, which takes routings of services as decision variables, and solves multi-objective optimization problem by making use of cooperation between sub-populations. To avoid local convergence, the chaos mutation is introduced. By means of optimazing the routings of services, average risk is lowered and risk balance is enhanced. Effects of greed attack on original network and optimized network show that the vulnerability is improved greatly。...