| Quantum Key Distribution(QKD)technology can achieve theoretically unconditional secure communication by virtue of three basic principles of quantum mechanics,and quantum key distribution network can realize multi-user,high-r-ate,long-distance,networked key distribution,which is the only way for quantum key distribution technology to become practical.With the successful construction of the small-scale QKD experimental network,in order to further expand the coverage and network scale of the quantum key distribution network,it is necessary to conduct resear-ch on the wide-area quantum key distribution network.The wide-area quantum key distribution network has the characteristics of large number of nodes,large scale,and complex connection relationship,which leads to problems such as complicated routing management and large load pressure of nodes.Aiming at these problems,this thesis proposes a multi-domain architecture model and related routing algorithms suitable for wide-area quantum key distribution networks.The specific research contents are as follows:Firstly,we propose a multi-domain architecture model of wide-area quantum key distribution network based on software defined optical network(SDON)technology.Aiming at the problems of wide routing management and large load pressure of nodes in wide-area quantum key distribution network,based on the multi-domain idea and the advantages of SDON technology,we propose a multi-domain ar-chitecture model of wide-area quantum key distribution network based on SDON technology.The multi-domain architecture model modularizes the network functions in a layered manner,it is divided into application layer,control layer,key layer and data layer from top to bottom,and the quantum key relay node model in the key layer is designed.At the same time,the security policy process is designed for the security requirements of the services.Based on the multi-domain architecture model,not only facilitates the management of routing and relieves the load pressure of nodes,but also realizes unified control of resources and programmable control of security policies,which can lay a foundation for efficient quantum secure communication services.Secondly,we propose a key resource balancing based intra-domain routing algorithm.The existing key distribution routing algorithm has a single routing indicator,which may result in unbalanced key resource utilization and high blockin g probability of key distribution services.Aiming at this deficiency,this thesis proposes a key resource balancing based intra-domain routing algorithm.The algorithm completes the selection of the optimal path by considering the three selection indicators of the local key remaining amount,the degree of the node,and the number of routing hops.Compared with the existing key distribution routing algorithm,the proposed scheme can effectively balance the key resources and reduce the blocking probability of the key distribution service.It also lays a foundation for the research of inter-domain routing algorithms.Thirdly,we propose a M random path(MRP)based inter-domain routing algorithm.The random single routing of the traditional inter-domain routing algorithm will lead to a high blocking probability of the key distribution service.In response to this deficiency,this thesis proposes a MRP based inter-domain routing algorithm.The algorithm randomly selects the M boundary node pairs in the source domain and the destination domain to obtain the corresponding key routing domain sequence,and calculates the path separately by using the intra-domain routing algorithm.Finally,an optimal path is selected according to the routing hop count as the routing indicator.The solution can reduce the blocking probability of the key distribution service and improve the service quality of the network.The superiority of the proposed scheme is verified by the simulation comparison with the traditional inter-domain routing algorithm. |
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