中文摘要：

进入信息时代,人们对通信有了更高要求。低轨卫星通信系统的应用,使通信信号能够实现全球覆盖,完善了全球个人通信网,推动了移动通信的发展。针对低轨卫星通信的特点,对链路层的设计进行分析。在此基础上,结合现有的卫星通信技术策略,分析我国自主研发的福星低轨卫星通信系统协议栈,从随机接入、切换和资源分配三个方面,介绍福星通信系统协议的链路层架构及其设计方法,为低轨卫星通信协议的应用提供参考。

英文摘要：

with the entering of information age,people have even higher requirements for communication.The application of LEO satellite communication system enables communication signals to achieve global coverage,improves the global personal communications network,and promotes the development of mobile communications.In light of the characteristics of LEO satellite communication,the design of link layer is analyzed.Based on this and in combination with the existing technical strategy of satellite communication,Fuxing low orbit satellite communication system protocol stack,independently researched and developed by China,is analyzed,and the link layer architecture and design method of Fuxing communication system protocol are described from three aspects of random access,handoff and resource allocation,thus to provide certain reference for the application of LEO satellite communication protocol.