Because of multiple advantages such as high bandwidth, high security, and flexible networking, the free space optical communication (FSO) has attracted more and more attention. However, the narrow beam of laser and the constrained access degree of optical node limit the development of mobile FSO networks, especially in the aspect of handover. In this paper, we propose a fuzzy logic control-based handover decision (FLC-HD) algorithm to ensure real-time and reliable communication. First, according to the predictive position and the motion information of mobile nodes obtained by the error correction extend Kalman filter algorithm, we obtain the received signal strength and the relative motion angles at next transmission. Second, we put forward the concept of threshold to ensure the completion of handover operations before the current link breaking. Third, the fuzzy logic control method is designed to select the optimal access point (AP) with three critical parameters, i.e., the received signal strength, the relative motion angles, and the access degrees of nodes. Simulation results show that the FLC-HD algorithm can improve the handover efficiency and relieve the ping-pong effect in mobile FSO networks.

由于高带宽，高安全性和灵活的网络连接等多种优势，自由空间光通信（FSO）引起了越来越多的关注。然而，激光的窄光束和光节点的受限接入程度限制了移动FSO网络的发展，特别是在切换方面。在本文中，我们提出了一种基于模糊逻辑控制的切换决策（FLC-HD）算法，以确保实时，可靠的通信。首先，根据通过纠错扩展卡尔曼滤波算法获得的移动节点的预测位置和运动信息，获得下一次传输的接收信号强度和相对运动角度。其次，我们提出了阈值的概念，以确保在当前链路断开之前完成切换操作。第三，设计模糊逻辑控制方法来选择具有三个关键参数的最优接入点（AP），即接收信号强度，相对运动角度和节点的接入程度。仿真结果表明，FLC-HD算法可以提高移动FSO网络的切换效率，减轻乒乓效应。