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Wireless powered cooperation-assisted mobile edge computing

Hu, X and Wong, KK and Yang, K (2018) 'Wireless powered cooperation-assisted mobile edge computing.' IEEE Transactions on Wireless Communications, 17 (4). pp. 2375-2388. ISSN 1536-1276

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Abstract

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 time-division 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'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 an energy 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.

Item Type: Article
Uncontrolled Keywords: Mobile edge computing; user cooperation; wireless power transfer; energy consumption; resource management
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Science and Health
Faculty of Science and Health > Computer Science and Electronic Engineering, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 26 Jun 2018 14:28
Last Modified: 23 Sep 2022 19:23
URI: http://repository.essex.ac.uk/id/eprint/22254

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