Parallel lightpath provisioning under wavelength continuity constraint in multi-domain optical networks based on hierarchical path computation element  

作　　者：SUN Jian WANG ZongWei CHEN Zhen PENG YunFeng 

机构地区：[1]School of Communication and Information Engineering,University of Electronic Science and Technology of China [2]School of Computer and Communication Engineering,University of Science and Technology Beijing

出　　处：《Science China(Information Sciences)》2013年第3期156-164,共9页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No. 61071101);National High-tech R&D Program of China (863 Program) (Grant No. 2009AA01Z254)

摘　　要：Inter-domain path provision under a wavelength continuity constraint （WCC）, including path com- putation and resource reservation procedures, is a major challenge in multi-domain wavelength division multi- plexing （WDM） optical networks, because of the requirement for confidentiality between the domains. Based on the hierarchical path computation dement （PCE） architecture, this work proposed a path establishment scheme under a WCC to provide a fast inter-domain path establishment solution and decrease the influence of the WCC. The hierarchical PCE architecture consists of a single parent PCE serving as the arbitrator and multiple child PCEs responsible for the child domains. By cooperation between the parent PCE and the child PCEs, both inter-domain path computation and inter-domain wavelength reservation can be processed in parallel to accelerate and optimize WCC lightpath provisioning and thus to reduce the blocking probability. The effective- ness of this solution has been evaluated through simulations. The simulation results show that the proposed solution can achieve lower computation and reservation delays and thus lead to lower blocking probabilities on the multi-domain WCC paths.Inter-domain path provision under a wavelength continuity constraint （WCC）, including path com- putation and resource reservation procedures, is a major challenge in multi-domain wavelength division multi- plexing （WDM） optical networks, because of the requirement for confidentiality between the domains. Based on the hierarchical path computation dement （PCE） architecture, this work proposed a path establishment scheme under a WCC to provide a fast inter-domain path establishment solution and decrease the influence of the WCC. The hierarchical PCE architecture consists of a single parent PCE serving as the arbitrator and multiple child PCEs responsible for the child domains. By cooperation between the parent PCE and the child PCEs, both inter-domain path computation and inter-domain wavelength reservation can be processed in parallel to accelerate and optimize WCC lightpath provisioning and thus to reduce the blocking probability. The effective- ness of this solution has been evaluated through simulations. The simulation results show that the proposed solution can achieve lower computation and reservation delays and thus lead to lower blocking probabilities on the multi-domain WCC paths.

关 键 词：multi-domain optical networks path computation resource reservation WCC hierarchical PCE 

分 类 号：TN929.1[电子电信—通信与信息系统]