A Sub-domain Routing Method for Wide-Area Quantum Key Distribution Networks

Abstract

The invention discloses a sub-domain routing method for a 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, so that the problems of complex routing management, high node load pressure and the like are caused. Aiming at the problems, the invention provides a sub-domain architecture suitable for the wide-area quantum key distribution network and a related routing algorithm. Firstly, the sub-domain architecture of the wide-area quantum key distribution network based on a software defined optical network is provided. On the basis, an intra-domain routing algorithm based on key resource equalization and an inter-domain routing algorithm based on M random paths are respectively provided. The proposed sub-domain architecture and the routing algorithm provide an integral sub-domain routing method for the wide-area quantum key distribution network, on one hand, the routing management can be facilitated, the load pressure of quantum key nodes is reduced, the unified regulation and control of resources are achieved, and on the other hand, the blocking rate of key distribution services can be reduced through an optimized routing mechanism, the in-domain key resources are utilized in a balanced mode, and the network service quality is improved.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a domain-divided routing method for a wide-area quantum key distribution network. The party mainly provides a feasible sub-domain routing method for the wide-area quantum key distribution network, which can not only facilitate the management of routing, reduce the load pressure on the quantum key relay node (Quantum Key Relay Node, QKRN), and realize the unified control of resources , and can reduce the blocking rate of the key distribution service, laying the foundation for the realization of efficient quantum secure communication services. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) technology relies on the three basic principles of quantum mechanics to achieve theoretically unconditionally secure secure communication, and the quantum key distribution network can achieve multi-user, high-speed, long-distance, networked encryption ...

AI Technical Summary

Problems solved by technology

[0005] First, the node load pressure is too large, and the routing management is complicated

In the entire wide-area quantum key distribution network, the number of nodes and links is huge, and the connection relationship is complex, resulting in more complex routing management, and each node must store a huge network topology information, which in turn causes a single node load Too much pressure

[0006] Second, the broadcast mechanism of link state information will lead to the consumption of more quantum key resources

Since the quantum key relay node obtains the link information of the entire network through the broadcast mechanism of link state information, and the transmission of these information between nodes needs to consume key resources

Especially in the wide-area quantum key distribution network, the broadcast mechanism of link state information will consume more key resources, which also causes a decline in the utilization of key resources

[0007] Third, the routing update convergence speed is slow

There are many nodes and links in the wide-area quantum key distribution network, and the connection relationship is more complicated. With the expansion of the network scale, the update speed of the routing information will be greatly slowed down, which will cause problems such as slow routing convergence. The path selection may be biased and the quality of the result may be poor because the routing information is not updated in time

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