Secure transmission of IRS-UAV buffer-aided relaying system with delay constraint  

作　　者：Dawei WANG Linfeng YUAN Hongbo ZHAO Lingtong MIN Yixin HE 

机构地区：[1]School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China [2]School of Electronic and Information Engineering,Beihang University,Beijing 100191,China [3]College of Information Science and Engineering,Jiaxing University,Jiaxing 314001,China

出　　处：《Chinese Journal of Aeronautics》2025年第3期447-461,共15页中国航空学报(英文版)

基　　金：co-supported by the National Natural Science Foundation of China(Nos.62271399,61901015,GNA22001 and GAA20024);the Zhejiang Provincial Natural Science Foundation of China(No.LQ24F010003).

摘　　要：This paper investigates the secure communication between legitimate users in the presence of eavesdroppers, where the Intelligent Reflective Surface-Unmanned Aerial Vehicle (IRS-UAV) and Buffer-Aided (BA) relaying techniques are utilized to enhance secrecy performance. By jointly optimizing the link selection strategy, the UAV position, and the reflection coefficient of the IRS, we aim to maximize the long-term average secrecy rate. Specifically, we propose a novel buffer in/out stabilization scheme based on the Lyapunov framework, which transforms the long-term average secrecy rate maximization problem into two per-slot drift-plus-penalty minimization problems with different link selection factors. The hybrid Particle Swarm Optimization-Artificial Fish Swarm Algorithm (PSO-AFSA) is adopted to optimize the UAV position, and the IRS reflection coefficient optimization problem is solved by iterative optimization in which auxiliary variables and standard convex optimization algorithms are introduced. Finally, the delay constraint is set to ensure the timeliness of information packets. Simulation results demonstrate that our proposed scheme outperforms the comparison schemes in terms of average secrecy rate. Specifically, the addition of BA improves the average secrecy rate by 1.37 bps/Hz, and the continued optimizations of IRS reflection coefficients and UAV positions improve the average secrecy rate by 2.46 bps/Hz and 3.75 bps/Hz, respectively.

关 键 词：Buffer-aided relaying technique Intelligent reflective surface Unmanned aerial vehicle Delay constraint Average secrecy rate 

分 类 号：TN929.5[电子电信—通信与信息系统]