基于STM32F107的LTE小基站从时钟同步系统的实现

Implementation of LTE small cell slave clock synchronization system based on STM32F107

由于网络环境的复杂化和网络设备的多样化,设备之间存在干扰,时钟同步就显得尤为重要。大到一个宏基站,小到一些交换机、路由器的通信设备,都需要一个统一的时钟。文中主要针对LTE小基站的从时钟同步技术进行了研究。基于国内外对时钟同步的研究现状,硬件同步方式卫星导航系统实现成本昂贵,而软件同步方式NTP网络时间协议精度不够,综合考虑精度、可靠性和成本,IEEE 1588v2时钟同步协议同步精度可达亚微秒级,满足LTE小基站对系统内时钟同步精度的要求。

Due to the complexity of the network environment and the diversification of network devices,there is interference between devices,and clock synchronization is particularly important.As large as a macro base station,as small as some communication devices such as switches and routers,a unified clock is required.The article mainly focuses on the realization of the slave clock synchronization technology of LTE small base stations.Based on the research status of clock synchronization at home and abroad,the hardware synchronization mode satellite navigation system is expensive to implement,while the software synchronization mode NTP network time protocol is not accurate enough,and the overall accuracy is considering reliability and cost,the synchronization accuracy of the IEEE 1588v2 clock synchronization protocol can reach sub⁃micron level,which meets the requirements of LTE small base stations for clock synchronization accuracy in the system.