Energy Efficiency Maximization for UAV-Assisted Emergency Communication Networks
| Autor: | Haibin Niu, Dongjun Ma, Liming Hou, Xinyu Zhao |
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| Rok vydání: | 2021 |
| Předmět: |
Technology
Mathematical optimization Optimization problem Article Subject Computer Networks and Communications Computer science ComputerApplications_COMPUTERSINOTHERSYSTEMS TK5101-6720 Maximization Energy consumption Computer Science::Robotics Fractional programming Bandwidth allocation Computer Science::Systems and Control Convex optimization Telecommunication Electrical and Electronic Engineering Coordinate descent Information Systems Efficient energy use |
| Zdroj: | Wireless Communications and Mobile Computing, Vol 2021 (2021) |
| ISSN: | 1530-8677 1530-8669 |
| DOI: | 10.1155/2021/7595347 |
| Popis: | Using unmanned aerial vehicles (UAVs) in emergency communications is a promising technology because of their flexible deployment, low cost, and high mobility. However, due to the limited energy of the onboard battery, the service duration of the UAV is greatly limited. In this paper, we study an emerging energy-efficient UAV emergency network, where a UAV works as an aerial base station to serve a group of users with different statistical quality-of-service (QoS) constraints in the downlink. In particular, the energy efficiency of the UAV is defined as the sum effective capacity of the downlink users divided by the energy consumption of the UAV, which includes the energy consumed by communication and the energy consumed by hovering. Then, we formulate an optimization problem to maximize the energy efficiency of the UAV by jointly optimizing the UAV’s altitude, downlink transmit power, and bandwidth allocation while meeting a statistical delay QoS requirement for each user. The formulated optimization problem is a nonlinear nonconvex optimization problem of fractional programming, which is difficult to solve. In order to deal with the nonconvex optimization problem, the following two steps are used. First, we transform the fractional objective function into a tractable subtractive function. Second, we decompose the original optimization problem into three subproblems, and then, we propose an efficient iterative algorithm to obtain the energy efficiency maximization value by using the Dinkelbach method, the block coordinate descent, and the successive convex optimization technique. Extensive simulation results show that our proposed algorithm has significant energy savings compared with a benchmark scheme. |
| Databáze: | OpenAIRE |
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