A Cooperative Jamming Based Secure Uplink Transmission Scheme for Heterogeneous Networks Supporting D2D Communications

A heterogeneous network supporting D2D communications is a typical framework to cope with data sharing in a cyber physical system. In the network, there exists more interference than traditional cellular networks, which promotes interference cancellation (IC) technologies. Yet, how IC can improve security performance of D2D-enabled networks is still unknown. In addition, how to establish a secure physical transmission link for users in these networks is of great significance. In this paper, with IC or not, we first derive the expressions of the secrecy outage probability in D2D-enabled heterogeneous networks, respectively. Then, according to the transmission constraint and the security constraint, we present two cooperative jamming schemes based on devices in D2D networks for achieving secure uplink of cellular users. In these schemes, we formulate the above secure challenge as an optimization problem with or without fully IC and provide the corresponding optimal solutions to improve the secrecy performance of cellular uplink. Finally, numerical simulation demonstrates that the secure performance of cellular uplink is remarkably enhanced using our cooperative jamming schemes.