Energy-Efficient Secure Computation Offloading in Wireless Powered Mobile Edge Computing Systems

Mengru Wu, Qingyang Song, Lei Guo, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

This paper investigates secure offloading for a wireless powered mobile edge computing (MEC) system. Specifically, an energy-constrained user is first charged by a power beacon (PB) via wireless power transfer (WPT) and then leverages the harvested energy to offload its computation tasks to a MEC server in the presence of multiple eavesdroppers. To enhance the security of computation offloading, we propose a novel physical layer security-assisted scheme, in which the PB can also play the role of a cooperative jammer by transmitting jamming signals to interfere with the eavesdroppers. The objective is to maximize secrecy energy efficiency (SEE) of the MEC system by jointly optimizing the transmit power for WPT, offloading, and jamming, the time allocated for WPT and offloading, and the computation task partition while satisfying the secrecy offloading rate constraint and the energy causality constraint. To deal with the highly non-convex problem, we develop an efficient two-layer algorithm by resorting to variable substitutions, successive convex approximation, and the Dinkelbach method. Simulation results demonstrate that our designed scheme yields a SEE performance enhancement as compared to benchmarks.

Original languageEnglish
Pages (from-to)6907-6912
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Volume72
Issue number5
DOIs
Publication statusPublished - 2023 May 1

Bibliographical note

Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 62025105 and in part by the National Research Foundation of Korea (NRF) funded by Korea Government (MSIT) under Grant 2022R1A5A1027646.

Publisher Copyright:
© 1967-2012 IEEE.

Keywords

  • Mobile edge computing
  • physical layer security
  • secrecy energy efficiency
  • wireless power transfer

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering

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