| 面向5G网络应用的精确时间同步协议测试与分析 |
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| 引用本文： | 李由由,武建锋,王康.面向5G网络应用的精确时间同步协议测试与分析[J].全球定位系统,2020,45(5):90-96. |
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| 作者姓名： | 李由由 武建锋 王康 |
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| 作者单位： | 中国科学院国家授时中心 ,陕西西安 710600;中国科学院大学 ,北京100049;中国科学院国家授时中心 ,陕西西安 710600 |
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| 摘 要： | 随着5G的普及和基站建设,对基站间时间同步精度提出了更高的要求．目前,精确时间同步协议(PTP)只能达到几十纳秒,且频率分布效果差,将其结合同步以太网(SyncE)技术后可以实现网络上所有时钟的频率与时钟源同步．WR(White Rabbit)技术在PTP+SyncE的基础上加入了全数字双混频鉴相器(DDMTD),对节点间相位差进行调整补偿,消除由相位噪声长时间累积引起的不同步,动态实现了整个网络节点的时钟同步．本文分别介绍了将SyncE与PTP结合的同步方法和WR同步方法的原理及实现过程,最后构建实验平台验证同步过程,测试证明可以分别达到百皮秒和几十皮秒的抖动,同步精度分别能达到纳秒和亚纳秒级别.
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| 关 键 词： | 时间同步 PTP SyncE DDMTD White Rabbit |
Testing and analysis of precise time synchronization protocol for 5G network applications |
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| Affiliation: | 1.National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China2.University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | With the popularity of 5G and the construction of base stations,higher requirements have been placed on the accuracy of time synchronization between base stations.At present,Precision Timing Protocol (PTP) can only reach tens of nanoseconds,and the frequency distribution effect is poor.When combined with SyncE technology,the frequency of all clocks on the network can be synchronized with the clock source.WR (White Rabbit) adds an all-digital dual-mixing phase detector(DDMTD)on the basis of PTP+SyncE can adjust and compensate the phase difference between nodes to eliminate the out-of-synchronization caused by the accumulation of phase noise for a long time,So as to realize the clock synchronization of the entire network node.This article introduces the principle and implementation process of the synchronization method combining SyncE and PTP、the WR synchronization method.At the end,an experimental platform is built,to verify the synchronization process.The test proves that the jitter of 100 picoseconds and tens of picoseconds can be achieved respectively,and the synchronization accuracy can reach the nanosecond and sub-nanosecond levels. |
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