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Wireless Powered Cooperation-Assisted Mobile Edge Computing

Hu, X; Wong, KK; Yang, K; (2018) Wireless Powered Cooperation-Assisted Mobile Edge Computing. IEEE Transactions on Wireless Communications , 17 (4) , Article IEEE Transactions on Wireless Communications. 10.1109/TWC.2018.2794345. Green open access

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This paper studies a mobile edge computing (MEC) system in which two mobile devices are energized by the wireless power transfer (WPT) from an access point (AP) and they can offload part or all of their computation-intensive latency-critical tasks to the AP connected with an MEC server or an edge cloud. This harvest-then-offload protocol operates in an optimized timedivision manner. To overcome the doubly near-far effect for the farther mobile device, cooperative communications in the form of relaying via the nearer mobile device is considered for offloading. Our aim is to minimize the AP & #x2019;s total transmit energy subject to the constraints of the computational tasks. We illustrate that the optimization is equivalent to a min-max problem, which can be optimally solved by a two-phase method. The first phase obtains the optimal offloading decisions by solving a sum-energy-saving maximization problem for given a transmit power. In the second phase, the optimal minimum energy transmit power is obtained by a bisection search method. Numerical results demonstrate that the optimized MEC system utilizing cooperation has significant performance improvement over systems without cooperation.

Type: Article
Title: Wireless Powered Cooperation-Assisted Mobile Edge Computing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TWC.2018.2794345
Publisher version: https://doi.org/10.1109/TWC.2018.2794345
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
Keywords: Wireless communication, Mobile handsets, Resource management, Mobile communication, Cloud computing, Computational modeling
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10043332
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