Research On Resource Allocation Technology In Quantum Key Ditribution Satellite Networks

With the development of terrestrial quantum key distribution network,the need of constructing global quantum network arises for the security of data transmission.However,fiber-based quantum communication is limited by distance and loss optical transmission in ultra-long distance.In contrast,free space quantum key distribution has the advantages of low transmission loss and wide coverage,which is an effective way to achieve global quantum communication.Since the coverage of single quantum satellite is limited,it is necessary to build a constellation-based quantum satellite network,meanwhile how to leverage satellite resources to distributing keys is also an urgent problem.To solve the central problem of "how to leverage quantum satellite resources for key distribution",this paper designs the networking architecture of quantum satellite networks firstly.The routing and resource allocation schemes are proposed for "trusted-node-based networks" and"quantum-repeater-based networks" repectively.This paper mainly contains three parts:Firstly,in order to realize the networking of the quantum satellites,a double-layer quantum satellite network structure composed of high-orbiting and low-orbiting satellites is proposed,which can fully combine the advantages of different orbits and overcome their shortages.It provides an important basis for the following research on resource allocation schemes.Secondly,to resolve the resource allocation problem in trusted-node-based quantum satellite networks,the joint GEO and LEO routing and key allocation scheme(JGL-RKA)is proposed.Based on the double-layer quantum satellite network architecture,this scheme establishes a resource description model for quantum satellite networks and then designs a combined high-low orbit routing and resource allocation algorithm.In addition,this chapter explores the impact of node and service factors on the performance of proposed scheme.The simulation results show that the service successful probability under double-layer satellite network is about 13%higher than that of the single-layer network,and the successful probability is larger than 85%under heavy traffic.Third,to resolve the resource allocation problem in quantum-repeater-based quantum satellite networks,the transmission-quality-guaranteed satellite key distribution scheme(QG-RTA)is proposed.This scheme presents a multi-service satellite key distribution scheme,and designs a routing and timslot allocation algorithm that considers efficiency of repeaters.The simulation results show that the resource allocation algorithm considering repeater efficiency can effectively improve the transmission quality of the key distribution service and maintain a high service successful probability when the topology changes.