空天地一体化空口接入协议研究

Research on Air Interface Access Protocol of Space-Air-Ground Integrated Networks

空天地一体化通信可实现网络立体覆盖,但存在大时延、高频偏、高动态问题。针对此问题,首先概述了空天地一体化技术演进趋势;其次,分析了地面移动通信以及卫星通信网络的空口接入协议及存在的不足;最后,基于6G空天地一体化的统一空口协议框架以及卫星可通过星间链路交互信息特征,提出一种低时延的空口接入协议方案,通过减少星间切换空口接入流程,达到用户快速接入网络的目的。

The space-air-ground integrated communication can realize three-dimensional network coverage, but there are problems of large time delay, high frequency offset and high dynamics. To address them, this paper firstly outlines the evolution trends of space-air-ground integrated technologies, and then analyzes the air interface access protocols and the corresponding shortcomings of terrestrial mobile networks and satellite communication networks. Finally, based on the unified air interface protocol framework of 6 G space-air-ground integration and the characteristics of satellites interacting information through inter-satellite links, a low-latency air interface protocol scheme is proposed to realize the fast user access by reducing the inter-satellite switching of the air interface access process.