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Exchange of crucial and confidential information leads to the unprecedentedattention on the security problem in wireless networks. Though the security hasbeen studied in a number of works, the joint optimization of the physical layersecurity and the end-to-end delay management, which requires a meticulouscross-layer design, has seldom been evaluated. In this work, by combining thetools from stochastic geometry and queueing theory, we analyze the tradeoffbetween the delay and the security performance in large wireless networks. Wefurther propose a simple transmission mechanism which splits a message into twopackets and evaluate its effect on the mean delay and the secrecy outageprobability. Our numerical results reveal that the security performance isbetter for larger path loss exponent when the density of legitimate nodes islarge, and it is reverse when the density is small. Moreover, it is observedthat by introducing the simple mechanism of message split, the securityperformance is greatly improved in the backlogged scenario and slightlyimproved in the dynamic scenario when the density of legitimate transmitters islarge. In summary, this work provides an understanding and a rule-of-thumb forthe practical design of wireless networks where both the delay and the securityare key concerns.

Tradeoff between Delay and Physical Layer Security in Wireless Networks