Due to the advantages of high mobility, flexibility and fast reconfiguration, the interest of applying unmanned aerial vehicles (UAVs) to wireless communications is growing rapidly in the past decade. A multiple UAVs relaying wireless network is considered in this paper, where buffer-aided UAVs form a multi-hop aerial relaying network to provide the reliable wireless communication services for ground terminals where the direct communication link is unavailable. Considering the buffer constraints, the link selection constraints, the transmit power constraints and the UAV mobility constraints, we maximize the average throughput. Nevertheless, the formulated optimization problem is intractable because it involves mixed-integer non-convex programming. To track this problem, an iterative algorithm is proposed which can efficient obtain a suboptimal to the original problem. Numerical results validate that this algorithm is convergent and efficient. Furthermore, it is shown that the proposed design can greatly enhance the system performance as compared to benchmark schemes.

由于高移动性，灵活性和快速重新配置的优势，在过去的十年中，将无人飞行器（UAV）应用于无线通信的兴趣迅速增长。本文考虑了多个UAV中继无线网络，其中由缓冲区辅助的UAV形成多跳空中中继网络，以为没有直接通信链路的地面终端提供可靠的无线通信服务。考虑到缓冲区约束，链路选择约束，发射功率约束和UAV移动性约束，我们使平均吞吐量最大化。但是，公式化的优化问题是棘手的，因为它涉及混合整数非凸编程。为了追踪这个问题，提出了一种迭代算法，可以有效地获得原始问题的次优值。数值结果验证了该算法的收敛性和有效性。此外，表明与基准方案相比，所提出的设计可以大大提高系统性能。