低空空域VHF动态接入移动性管理

低空空域超短波( VHF)动态接入移动性管理技术是保障低空飞行不间断、跨区域通信的关键。根据低空空管通信网络框架，设计了低空空管二级移动性管理模型；借鉴GSM经典移动性管理模型，引入访问/归属位置寄存器机制，解决了地面通信网有效管理低空飞行器位置信息的问题。详细阐述了登记注册、入网/退网、站内移动性管理和站间移动性管理等流程。最后，分析了移动性管理时延，并给出了系统演示和仿真，为进一步研究打下了基础。

Mobility management of VHF dynamic access in low-altitude airspace

The mobility management of Very High Frequency(VHF) dynamic access in low-altitude airspace is the key to realize uninterrupted and cross regional communication for low attitude flight.According to the low-altitude airspace communication network architecture,a hierarchical mobility management model is designed by Home Location Register/Visitor Location Register(HLR/VLR) mechanism with the successful experiences of Global System for Mobile(GSM),which dresses the issue of aircrafts location management effectively.Registration,logging in/out,inter and intra station mobility management are described in detail.Finally,the delay of mobility management is analyzed and simulation is demonstrated,which lays foundation for further research on mobility management of VHF dynamic access.