蜂窝移动网络低成本高精度授时

High-Precision and Low-Cost Timing Method of Mobile Cellular Network

传统的网络授时和卫星授时方法受制于授时精度和部署环境,难以满足移动网络业务对高精度同步的需求。针对这一问题,提出了一种移动终端低成本基带授时模组设计,并基于软件定义了无线电的移动通信基站和展锐模组,实现了原型授时系统。定义了移动网络授时端到端的误差源模型和基于空中接口物理层信号的网络授时技术的原理,并重点阐述了如何基于授时信令精确下发绝对时间及如何基于多种空口物理层信号的时延估计补偿、误差感知、鲁棒的机制和统计补偿等方法在移动网络中实现亚微秒的同步精度。实验结果表明,单次空口授时精度优于10^(-7)s。

Traditional network timing and satellite timing methods are restricted by timing accuracy and deployment environment.It is challenging to meet the demands of mobile network services for high-precision synchronization.To solve this problem,a design based on the low-cost baseband timing module for mobile terminals is proposed.A prototype consisting of software-defined radio-based 5G base station and Zhanrui module is implemented.An end-to-end error source model,principle and implementation of the network timing technology based on the air interface physical layer signal are defined.Issues including the air interface delay compensation method,error perception method and the robust statistical compensation method are discussed so as to achieve sub-microsecond synchronization accuracy in the mobile network.The experimental results show that the single-time timing accuracy is better than 10^(-7) s.