Energy-Efficient Secure Offloading for NOMA-Enabled Machine-type Mobile-Edge Computing

Mobile edge computing (MEC) has emerged as a crucial paradigm for enhancing the capabilities in machine-type communication, which relies on sufficient spectrum resources to efficiently process the offloading tasks. However, the rise in the number of IoT devices and the expansion of machine-type communication traffic can cause spectrum shortages. Non-orthogonal multiple access (NOMA) allows multiple users to share the same bandwidth simultaneously, which can be applied to improve spectrum efficiency. Furthermore, the growing connectivity of devices and transmission of sensitive data in IoT networks give rise to significant concerns regarding both security threats and energy efficiency. In this paper, a NOMA-enabled MEC system is studied. In the presence of an eavesdropper, the secrecy rate is further adopted to measure the security performance of offloading. We aim to maximize secrecy computation efficiency in a NOMA-enabled MEC system. The simulation results demonstrate the improvement of secrecy computation efficiency by applying NOMA in mobile edge computing systems.