Abstract
Simultaneous wireless information and power transfer (SWIPT) has sparked a wave of interest in research, while unmanned aerial vehicles (UAVs) can offer a high level of service for Internet of Things (IoT) due to its deployment flexibly. In this paper, we employ multiple UAVs as transmitters to realize information-transmitting and energy-transferring for ground IoT devices simultaneously to expand the capacity and coverage of the network, where each UAV is associated with multiple ground devices. This paper investigates joint optimization of three-dimensional (3D) locations, user association and power allocation of the UAVs with the aim of maximizing the minimum data rate among multiple dispersed users on the ground while guaranteeing the energy requirement of each user. Meanwhile, the proposed optimization problem contains the transmit power budget of each UAV and constraints on user association. The feasibility analysis ensures that the problem can be solvable. To address the combinatorial optimization problem, non-convex problems are decomposed into two subproblems. Then they are transformed into a series of convex problems alternately via successive convex optimization technique. Subsequently, we develop a multi-variable iterative algorithm to settle the overall problem. Next, the convergence performance of the proposed algorithm is confirmed. In conclusion, simulation results operated under various parameter configurations substantiate the proposed algorithm can achieve a higher data rate compared with other benchmark schemes.
Highlights
VOLUME 7, 2019 in [39], we investigate the power allocation and trajectory optimization problem for unmanned aerial vehicles (UAVs)-assisted simultaneous wireless information and power transfer (SWIPT) with power splitting in Internet of Things (IoT), where there is a single UAV and the UAV flies at a fixed height
In this paper, we extend from a single UAV to multiple UAV, which leads to the discussion about the 3D location deployment and user association
Power of UAV is almost allocated to their matching nodes, in which the closer the node is to the UAV, the less power the UAV will transmit to it
Summary
Some related work on UAV-assisted SWIPT are presented in [29], [30] Those authors investigate the UAV-assisted SWIPT systems, where each node on the ground does not really receive information and harvest energy simultaneously. CONTRIBUTIONS In this paper, we consider a multi-UAV-assisted SWIPT in IoT, in which the efficient 3D locations of UAVs are analyzed to exploit high flexibility of the UAVs. The situation where there are multiple UAVs and multiple ground nodes has led to our studies on the user association. The ground nodes receive information and harvest energy simultaneously, so the transmit power of the UAVs and power splitting ratio of each node are needed to be co-optimized. We present a formulated problem framework of joint optimization of 3D location, user association and power allocation for multi-UAV-assisted SWIPT with power splitting. M=1 where σ 2 is the noise power spectrum density
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