Joint Deployment and Task Scheduling Optimization for Large-Scale Mobile Users in Multi-UAV Enabled Mobile Edge Computing

Wang, Yong, Ru, Zhi-Yang, Wang, Kezhi and Huang, Pei-Qiu (2019) Joint Deployment and Task Scheduling Optimization for Large-Scale Mobile Users in Multi-UAV Enabled Mobile Edge Computing. IEEE Transactions on Cybernetics. ISSN 2168-2267 (In Press)

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Official URL: https://doi.org/10.1109/tcyb.2019.2935466

Abstract

This article establishes a new multiunmanned aerial vehicle (multi-UAV)-enabled mobile edge computing (MEC) system, where a number of unmanned aerial vehicles (UAVs) are deployed as flying edge clouds for large-scale mobile users. In this system, we need to optimize the deployment of UAVs, by considering their number and locations. At the same time, to provide good services for all mobile users, it is necessary to optimize task scheduling. Specifically, for each mobile user, we need to determine whether its task is executed locally or on a UAV (i.e., offloading decision), and how many resources should be allocated (i.e., resource allocation). This article presents a two-layer optimization method for jointly optimizing the deployment of UAVs and task scheduling, with the aim of minimizing system energy consumption. By analyzing this system, we obtain the following property: the number of UAVs should be as small as possible under the condition that all tasks can be completed. Based on this property, in the upper layer, we propose a differential evolution algorithm with an elimination operator to optimize the deployment of UAVs, in which each individual represents a UAV's location and the entire population represents an entire deployment of UAVs. During the evolution, we first determine the maximum number of UAVs. Subsequently, the elimination operator gradually reduces the number of UAVs until at least one task cannot be executed under delay constraints. This process achieves an adaptive adjustment of the number of UAVs. In the lower layer, based on the given deployment of UAVs, we transform the task scheduling into a 0-1 integer programming problem. Due to the large-scale characteristic of this 0-1 integer programming problem, we propose an efficient greedy algorithm to obtain the near-optimal solution with much less time. The effectiveness of the proposed two-layer optimization method and the established multi-UAV-enabled MEC system is demonstrated on ten instances with up to 1000 mobile users.

Item Type: Article
Uncontrolled Keywords: Multi-unmanned aerial vehicle, mobile edge computing, deployment, task scheduling, two-layer optimization, differential evolution
Subjects: G400 Computer Science
G500 Information Systems
Department: Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User: Elena Carlaw
Date Deposited: 13 Aug 2019 08:36
Last Modified: 11 Oct 2019 13:31
URI: http://nrl.northumbria.ac.uk/id/eprint/40323

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