A Novel Secrecy Offloading in NOMA Heterogeneous Mobile Edge Computing Network

In this study, we investigate the security offloading scenario in the NOMA heterogeneous mobile edge computing (Het-MEC) network over the Rayleigh fading channel. Specifically, we propose a system model consisting of an edge user and a pair of MEC access points, in which the user offloads its task to these heterogeneous wireless access points in the presence of a passive eavesdropper. Accordingly, we propose a four-phase secure offloading protocol based on NOMA (SONOMA) to ensure system security. Next, we derive the closed-form expression for the system performance metric: the secrecy successful computation probability (SSCP). The numerical results illustrate the effects of essential system parameters such as the average transmit power, power allocation coefficient, bandwidth, CPU frequency, and the task length of SONOMA. The Monte-Carlo simulation has verified the correctness of our study.