Research On Security Handover Mechanism Of Space Air Ground Integrated Information Network

The air-space-ground integrated network is a three-layer heterogeneous network composed of space-based,space-based and ground-based,which can meet the emerging needs of ubiquitous high-speed wireless communication services,and is an important direction for the development of the sixth-generation mobile communication technology in the future.Due to the high mobility of mid-orbit and low-orbit satellites and drones in the air-space-ground integrated network,frequent user handovers,and quick and safe completion of handovers are essential to ensure the seamless global coverage of the air-space-ground integrated network.In the design of the secure handover strategy,the existing research mainly focuses on improving the authentication security during the handover process and reducing the signaling and calculation overhead.It does not consider how to optimize the overall network handover delay and throughput and other performance,under the premise of meeting certain security requirements.To this end,this paper,based on the software-defined air-space-ground integrated network architecture,makes full use of the advantages of software-defined network centralized resource management and control,and studies the secure handover strategy that optimizes performance parameters such as handover delay,throughput,and service duration.This paper firstly combines the software-defined air-space-ground integrated network architecture to design a cross-domain secure handover process based on pre-authentication.Further comprehensive consideration of handover performance and handover security,an optimization problem with the goal of minimizing the total handover delay of all users is established,and a heuristic handover point selection algorithm is proposed to reduce the handover as much as possible under the premise of satisfying secure time delay.The simulation results show that,compared with the baseline algorithm,the algorithm proposed in this paper reduces the handover delay by 16.92%.Secondly,this article focuses on the cross-domain handover scenario with limited bandwidth resources in the software-defined air-space-ground integrated network.Under the constraint of satisfying the requirement of safe handover delay,this paper jointly considers the system throughput,business priority and service duration,and establishes an optimization problem with the goal of maximizing users and utility.Then this paper proposes a joint optimization strategy for switching point selection and channel allocation based on branch and bound method and interior point method.The simulation results show that compared with the baseline algorithm,the algorithm can obtain 76.2%user and utility improvement.