Research On Survivability Technology Of Software Defined Quantum Key Distribution Network

With the continuous development of communication technology and the popularity of Internet applications,information security has received widespread attention in various fields such as military,government,and finance.Countries in the world have gradually increased their investment in network information security.As a supporting technology in the field of quantum communication,quantum key distribution technology has also undergone the development and changes from theoretical research to practical applications.The technical schemes of quantum key distribution network networking have also been gradually promoted to be industrial.Previously,there has always been a lack of secure and effective centralized key resource allocation scheme for resource scheduling,unified management and control in the QKD network.As software-defined technology has been applied in the research of QKD network networking,breakthroughs in the optimization of QKD network structures have emerged,and the survivability issues of QKD network have also received widespread attention.Then,how to realize the protection of the quantum key distribution process,the efficient response and recovery for network failure based on the overall architecture perspective,considering of efficient scheduling of heterogeneous network resources in the meantime,is the point of survivability research in software defined-quantum key distribution Network(SD-QKDN).Based on the survivability requirements of the software-defined quantum key distribution network,this paper research on several aspects,such as networking architecture,key technologies,protection and recovery strategies,to overcome the survivability mechanism for key services in SD-QKDN and the optimal scheduling of heterogeneous resources.The main tasks and innovations are as follows:1.Aiming at the functional composition,centralized management and control mechanism of each layer in SD-QKDN,this paper studies the network architecture and node model of SD-QKDN,the relevant standards of key processes under the SD-QKDN architecture are investigated,and the key technologies such as routing and resource allocation are also in-depth studied.These works have laid the foundation for solving the SD-QKDN survivability problem.2.Aiming at the rapid recovery of services and the need to resist failure risks in SD-QKDN,a time slot resource description model in a time-division multiplexed QKD network is proposed first.Then,,both of the wavelength,time slot and key resource allocation(RWTKA)algorithm are constructed in working path and protection path,with comprehensive consideration of resource optimization and key update.Then,a preset resource protection scheme based on shared backup path protection(SBPP)and the protection mechanism process applied in the SD-QKDN are designed.The simulation result shows that the algorithm can achieve more efficient resource utilization while guaranteeing the key distribution process.For example,in the simulation case,compared with the protection scheme of dedicated protection,the algorithm can increase the success rate of key distribution under the same conditions by 18%,and the utilization rate of the two resources of time slot and key can be boosted 10%and 5%,which means a network protection method that achieves rapid recovery and efficient use of resources has been verified.3.Aiming at key services with higher tolerance to failure delay in SD-QKDN,a dynamic key pool model describing QKD network key resources is proposed first,and a key awareness-based multi-path obstacle avoidance routing scheduling algorithm is constructed.This paper further designs a differentiated recovery strategy based on service path classification and a recovery mechanism process applied in the SD-QKDN architecture.Simulation result shows that the algorithm can achieve higher recovery rate and resource utilization compared with the traditional single-path rerouting recovery scheme.For example,in the simulation case,when the key recovery rate of the algorithm proposed in this paper reaches 90%,the maximum difference between the recovery rate of the algorithm and the single path recovery algorithm is 13%,and the resource utilization gain can reach 7%,which means a network recovery scheme more adapted to the characteristics of quantum key distribution network resources is realized.