Physical-Layer Security Enhancement via Relay-Aided D2D Communications Underlaying Cellular Networks

Jules M Moualeu,Telex M N Ngatched

doi:10.1109/ojcoms.2020.2983538

Abstract

In this paper, we propose a relay-assisted device-to-device (D2D) communication as an underlay in a cellular network, where two sequential best relay nodes based on different selection criteria are chosen. Novel analytical expressions of the secrecy outage probability (SOP) and the probability of nonzero secrecy capacity (PNSC) are derived to evaluate the secrecy performance of the cellular network. In addition, we derive a simple and explicit approximation of the SOP in the high signal-to-noise ratio (SNR) to gain some insights on how various system parameters affect the aforementioned secrecy performance. Also, for the sake of comparison, the analytical SOP expression when only the cellular network exists, i.e., without the interference of the D2D communication, is obtained. Furthermore, to assess the usefulness of the cooperation between the D2D communication and the cellular network, we derive an analytical expression for the mutual outage probability (MOP) which represents the true outage probability across both the cellular and D2D networks. An asymptotic analysis of the MOP in the high SNR regime is obtained and the diversity order is derived. Finally, our proposed mathematical framework is compared with Monte-Carlo simulations to verify the accuracy of the derivations.

Highlights

F UELED by the proliferation and popularity of various intelligent and high-end devices, the tremendous growth of bandwidth-intensive multimedia applications and services, and the rapid increase in the number of base stations (BSs), mobile wireless communication has experienced an unprecedented growth in data traffic over the past decade
We assume that the secrecy rate RS = 1bit/s/Hz and the transmission rate RT = 1 bit/s/Hz, γh = γ, and M = N − 1 denotes the number of relay nodes that have not been selected for the D2D communication and that are available for selection of the second best relay to confound the cellular eavesdropper, with N denoting the total number of relay nodes in the D2D network
It can be observed that the analytical secrecy outage probability (SOP) (eqns. (16) and (17)) and the simulated SOP are in good agreement over the entire signal-to-noise ratio (SNR) regime, validating the accuracy of our mathematical derivations

Summary

Introduction

F UELED by the proliferation and popularity of various intelligent and high-end devices, the tremendous growth of bandwidth-intensive multimedia applications and services, and the rapid increase in the number of base stations (BSs), mobile wireless communication has experienced an unprecedented growth in data traffic over the past decade. A flurry of initiatives has been undertaken by industry and academia to research enabling technologies to satisfy the increasing demand for local traffic load and provide better user experience in cellular networks. Device-to-device (D2D) communication [3] has been proposed as an important supplement for existing and future cellular systems [4]. Due to the proximity of user equipment (UE), D2D communication in cellular spectrum supported by a cellular infrastructure can potentially improve user experience by reducing latency and power consumption, increasing peak data rate, and creating new

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Conclusion