Asymptotic Analysis of Physical Layer Security versus Reliability in IoT Wireless Transmission

In this paper, we investigate security-reliability tradeoff on physical layer in Internet of Things (IoT) network, when an eavesdropper tries to intercept secure transmission. The best-node scheduling scheme is employed as an auxiliary tool to decrease probability of intercept. The main and also wiretap channels are assumed to be subjected to composite generalized-K fading. Asymptotic expression of security versus reliability, valid in the range of medium to high average main-to-eavesdropper’s signal ratio (MER) values, is derived. The impact of different system parameters such as IoT network dimension, fading/shadowing conditions, path loss and average MER on intercept probability versus outage probability is observed, and then accompanying numerical results are shown.