Outage-driven link selection for secure buffer-aided networks  

作　　者：Dawei WANG Tianmi HE Fuhui ZHOU Julian CHENG Ruonan ZHANG Qihui WU 

机构地区：[1]School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China [2]Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Shenzhen 518057,China [3]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [4]College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China [5]Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space,Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China [6]School of Engineering,The University of British Columbia,Kelowna V1V1V7,Canada

出　　处：《Science China(Information Sciences)》2022年第8期193-208,共16页中国科学（信息科学）（英文版）

基　　金：supported in part by National Natural Science Foundation of China (Grant Nos. 61901379, 61941119, 62071223, 62031012);in part by National Key Research and Development Project (Grant No. 2020YFB1807602);in part by Young Elite Scientist Sponsorship Program by CAST;in part by Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (Grant No. 2020D04);in part by Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality (Grant No. JCYJ20190806160218174)。

摘　　要：In this paper, we investigate secure communication in a two-hop wireless network, where multiple buffer-aided relays assist to securely forward data from the sender to the destination threatened by a passive eavesdropper. To satisfy the security and delay requirements, we propose a novel link selection policy without the instantaneous wiretap channel state information. Different from the most current link selection policies,the proposed link selection policy is designed by joint considering the link secrecy outage probability and the buffer states. To evaluate the secrecy performance, we first characterize the system state transition matrix and the stationary state probability, and then derive the closed-form expressions for the secrecy outage probability and the secrecy rate. Moreover, we formulate a framework based on the queuing theory to analyze the end-to-end information delay at the source, the relays, and the queues, and derive the closed-form expression for the information delay. Finally, we conduct simulations to validate our theoretical performance analysis, and verify the performance improvement of the proposed outage-driven secure transmission scheme in terms of secrecy outage probability and information delay.

关 键 词：buffer-aided relay information delay link selection secrecy outage probability 

分 类 号：TN92[电子电信—通信与信息系统] TN918[电子电信—信息与通信工程]