期刊
IEEE INTERNET OF THINGS JOURNAL
卷 8, 期 10, 页码 8570-8584出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2020.3046788
关键词
Task analysis; Unmanned aerial vehicles; Trajectory; Resource management; Energy consumption; NOMA; Internet of Things; Computation offloading; local computation; mobile-edge computing (MEC); resource allocation; trajectory optimization
资金
- National Natural Science Foundation of China [61701230, 62071230, 62002164]
The article examines a UAV-assisted mobile-edge computing system, optimizing UAV trajectory and computation resource allocation to minimize energy consumption and achieve significant energy savings.
Unmanned aerial vehicles (UAVs) have been introduced into wireless communication systems to provide high-quality services and enhanced coverage due to their high mobility. In this article, we study a UAV-assisted mobile-edge computing (MEC) system in which a moving UAV equipped with computing resources is employed to help user devices (UDs) compute their tasks. The computing tasks of each UD can be divided into two parts: one portion is processed locally and the remaining portion is offloaded to the UAV for computing. Offloading is enabled by uplink and downlink communications between UDs and the UAV. On this basis, two types of access modes are considered, namely, nonorthogonal and orthogonal multiple access. For both access modes, we formulate new optimization problems to minimize the weighted-sum energy consumption of the UAV and UDs by jointly optimizing the UAV trajectory and computation resource allocation, under the constraint on the number of computation bits. These problems are nonconvex optimization problems that are difficult to solve directly. Accordingly, we develop alternating iterative algorithms to solve them based on the block alternating descent method. Specifically, the UAV trajectory and computation resource allocation are alteratively optimized in each iteration. Extensive simulation results demonstrate the significant energy savings of our proposed joint design over the benchmarks.
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