地铁LTE-M1588V2时钟同步方案风险分析

Risk Analysis of Metro LTE-M 1588V2 Clock Synchronization Scheme

基于LTE技术面向轨道交通的无线通信解决方案LTE-M承载信号CBTC、PIS、CCTV、TCMS、语音集群等多种业务,使得该系统成为保证地铁安全稳定运行的重要因素。然而,LTE技术本身对时钟精度要求比较高,采用单独1588V2时钟授时的方式,这样的授时方案是否可行,又会有哪些问题呢?采用何种可靠的授时方案来保证LTE系统的稳定运行将是亟待解决的问题。

Based on LTE technology,the LTE-M wireless communication solution for rail transit carries signals,including CBTC,PIS,CCTV,TCMS,voice trunking and other services,in order to make this system an important factor.This system will ensure the stable operation of the subway.However,LTE technology requires relatively high clock accuracy.A separate 1588V2 clock is used for time service.What are the problems of this time service solution?What kind of timing scheme is adopted to ensure the stable of the LTE system.These problems need to be solved urgently.