TD-LTE系统新增GPS时钟源方案研究

Research on the Scheme of GPS Clock Source Added to TD-LTE System

南昌市轨道交通3号线TD-LTE综合无线承载网系统为A/B双网设计,采用单一IEEE 1588V2时钟源架构实现网络时钟同步。为进一步提升TD-LTE系统授时稳定性和冗余性能水平,从现场运营提升要求角度出发,提出GPS时钟源+1588V2时钟源的双时钟系统改造技术思路,有效解决A/B双网BBU时钟相位不同步的问题,为城市轨道交通TD-LTE系统时钟源设备改造优化提供技术参考。

The TD-LTE integrated wireless bearer network system of Nanchang Rail Transit Line 3 is designed as an A/B dual network,using a single IEEE 1588V2 clock source architecture to achieve network clock synchronization.In order to further improve the timing stability and redundancy performance level of the TD-LTE system,and from the perspective of on-site operation improvement requirements,a dual clock system transformation technology idea of GPS clock source+1588V2 clock source is proposed,effectively solving the problem of asynchronous clock phase in A/B dual network BBU,and providing technical reference for the optimization of clock source equipment transformation in urban rail transit TD-LTE system.