The Optical Network Routing Algorithm Research Based On PCE

With the development of the optical network communication,the multi-domain optical network topology is becoming more and more complex,and the transfer requirement of large capacity communication is increasing.The traditional optical network architecture becomes unable to meet the needs of calculating the optical paths in optical network.Therefore,how to guarantee quality of service routing optimization,improve the multi-layer multi-domain optical network architecture has become an important research focus in the future development of optical networks.PCE(Path Computation Element)was,proposed by the Internet Engineering Task Force(IETF)and has gained wide attention due to its efficiency and flexibility for computing the constrained routing paths.However,for the distributed multi-layer and multi-domain network control,the traditional PCE-based optical network architecture is not an ideal solution.Therefore,this paper research the architecture of PCE based on the new,and suitable for the research of optical network routing algorithm of this architecture.In this paper,the main research works are as follows:First,this paper first presents a new optical network architecture based on PCE by adding a PCE-Agent to intelligently control PCEs in the conventional multi-domain optical network.Then,a PA-BRPC(PCE-Agent Backward Recursive PCE-based Computation Algorithm)routing algorithm is proposed by extending the BRPC(Backward Recursive PCE-based Computation Algorithm)algorithm in the PCE-Agent based multi-domain optical network architecture.The experimental results show that,compared with the traditional BRPC algorithm,our PA-BRPC algorithm based on the improved PCE-Agent architecture obtains better performance in terms of the utilization rate of the optical network resources in optical network.Furthermore,how to achieve the Quality of Service(QoS)and multi-cast routing on the PCE multi-domain optical networks remains a challenge to be solved.For this problem,this paper based on the newly proposed PCE-Agent optical network architecture,realize its support for QoS multicast service and proposed a multiple QoS constrained multicast routing algorithm.In the multicast path selection process,find the number of available wavelengths,bandwidth,delay and energy consumption in the path to the QoS requirements.The experimental results show that,the algorithm improves the light utilization rate of cyber source,more effective to prevent further aggravate congestion situation in optical network.