Security Energy Efficiency Maximization for Untrusted Relay Assisted NOMA-MEC Network With WPT

Abstract

Relay assisted transmission can effectively improve the range of coverage and offloading efficiency of non-orthogonal multiple access-mobile edge computing (NOMA-MEC) system. However, the relay will become untrusted relay when it is attacked by malicious users, resulting in the leakage of information. To solve this problem, this paper uses destination-assisted jamming to prevent the leakage of information during the offloading process. Under the condition of time delay and energy consumption, we jointly optimize the transmission power allocated to relay, central processing unit (CPU) frequency and offloading time to maximize the security energy efficiency of the user (UE). Since it is a non-convex multiobjective optimization problem, it is decomposed into several suboptimal single-objective sub-problems, and the single-objective sub-problems are transformed into convex problems by Taylor approximation method, then be solved by Lagrange dual method. Besides, the multi-objective iterative algorithm (MOIA) is further proposed to achieve joint optimal solution. The simulation results show that the proposed method can effectively improve the security offloading performance and security energy efficiency compared with other relay assisted offloading methods. INDEX TERMS Non-orthogonal multiple access-mobile edge computing; Untrusted relay; Offloading; Destination-assisted jamming; Security energy efficiency.

Entropy-based Reinforcement Learning for computation offloading service in software-defined multi-access edge computing

“…Huang et al [20] proposed a distributed computation offloading algorithm considering both the energy consumption and delays. Moreover, Zhao et al [21] added the energy consumption constraints to the optimization objectives for relay-assisted Non-Orthogonal Multiple Access (NOMA)-MEC network with WPT. However, the preceding work frequently ignores the top limit of the energy consumption of the equipment in the actual scenario.…”

Energy-Efficient Computational Offloading for Secure NOMA-Enabled Mobile Edge Computing Networks

“…Therefore, the related secrecy capacity enhancement techniques in the physical layer security can be applied, such as improving the main channel through relays; or deteriorating the eavesdropper's channel through artificial noise; or enhancing the main capacity through nonorthogonal multiple access technology. [21] studies the use of relay to improve the offloading rate. Since the relay is untrustworthy, the MEC server needs to interfere with it accordingly.…”