Exchange of crucial and confidential information leads to the unprecedented attention on the security problem in wireless networks. Even though the security has been studied in a number of works, the joint optimization of the physical layer security and the end-to-end delay management, which requires a meticulous cross-layer design, has seldom been evaluated. In this paper, by combining the tools from stochastic geometry and queueing theory, we analyze the tradeoff between the delay and the security performance in large wireless networks. We further propose a simple transmission mechanism which splits a message into two packets and evaluate its effect on the mean delay and the secrecy outage probability. Our numerical results reveal that the security performance is better for larger path loss exponent when the density of legitimate nodes is large, and it is reverse when the density is small. Moreover, it is observed that by introducing the simple mechanism of message split, the security performance is greatly improved in the backlogged scenario and slightly improved in the dynamic scenario when the density of legitimate transmitters is large. In summary, this paper provides an understanding and a rule-of-thumb for the practical design of wireless networks where both the delay and the security are key concerns. Delay, physical layer security, Poisson point process, queueing theory, stochastic geometry. degree in communication and information engineering from the Huazhong University of Science and Technology (HUST), China, in 2003. He has been with HUST since 2005. Prior to that, he was a Researcher with Ajou University, South Korea, and with the Politecnico di Torino, Italy, from 2004 to 2005. He is currently a Full Professor with the School of Electronic Information and Communications, HUST. He is also an Adjunct Professor with the Faculty of Engineering and Information Technology, University of Technology Sydney, Australia. He is the Director of the China International Joint Research Center of Green Communications and Networking. He has authored or co-authored about 180 papers in refereed journals and conference proceedings. He has been granted about 15 patents in China. His research interests are mobile communications, traffic modeling in wireless networks, green communications, and interference modeling in wireless communications. He was a recipient of the Best Paper Awards from the IEEE GLOBECOM 2010. He has been actively involved in organizing over 10 international conferences since 2005. He served as the General Chair of the 2015 IEEE International Conference on Green Computing and Communications. He serves as an Editor for the IEEE WIRELESS COMMUNI-CATIONS and the IEEE TRANSACTION ON GREEN COMMUNICATIONS AND NETWORKING. Tao Han (M'13) received the bachelor's degree in information engineering, the master's degree in communication and information system, and the Ph.D. degree in information and communication engineering from the Huazhong University
In REF , the tradeoff between delay and physical layer security in wireless networks is evaluated when the spatio-temporal fluctuation of traffic is considered.
Tradeoff Between Delay and Physical Layer Security in Wireless Networks
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Computer Science Mathematics