摘要
针对现有基于时钟脉冲的时间同步精度测量方法存在测量系统构成复杂、测量规模受仪器采集接口数量限制、测量数据无法支持实时网络管理控制等问题,基于时间敏感网络(TSN)集中式管控架构,提出了一种轻量级可扩展的时间同步精度测量方法Virtual Scoping(VS),能够在网络控制平面虚拟化示波器的功能。该方法定义了可用于精确测量同步精度的参数DriftTime,该参数由同步报文发送时间戳、驻留时延、链路时延等协议状态数据计算。最后在网络控制平面实现V-Scope工具并部署在基于OpenTSN开源项目搭建的原型系统进行实验。实验结果表明,V-Scope工具与专业测试仪的测量结果具有一致性。此外,以精度优化为例对VS方法在支持网络管理控制功能的可行性和优越性进行探讨和论证,设计实现了一种基于V-Scope的频差补偿算法,最高可将原型系统同步精度提升32.3%。
Aiming at the problems of existing time synchronization accuracy measurement methods based on clock pulse,such as complex measurement system composition,limited measurement scale by the number of instrument acquisition interfaces,and inability of measurement data to support real-time network management and control,a lightweight and scalable time synchronization accuracy measurement method called Virtual Scoping(VS)was proposed based on the centralized management and control architecture of time-sensitive networking(TSN).Ability to virtualize oscilloscope functions in the network control plane.Firstly,the parameter DriftTime was defined by the method,which could be used to accurately estimate synchronization accuracy.This parameter was calculated from protocol status data such as synchronization message transmission timestamps,residence delay,and link delay.Finally,the V-Scope tool was implemented in the network control plane and deployed in a prototype system built on the OpenTSN open-source project for experimentation.The results demonstrate that V-Scope exhibits only nanosecond-level errors compared to measurements obtained from professional testing equipment.Additionally,the feasibility and advantages of the VS method in supporting network management functions are discussed.As an example of accuracy optimization,a frequency offset compensation algorithm based on V-Scope is designed and implemented,which improves the synchronization accuracy of the prototype system by 32.3%.
作者
孙寅涵
孙志刚
付文文
李文超
黄容
SUN Yinhan;SUN Zhigang;FU Wenwen;LI Wenchao;HUANG Rong(College of Computer,National University of Defense Technology,Changsha 410073,China)
出处
《通信学报》
EI
CSCD
北大核心
2024年第9期1-13,共13页
Journal on Communications
基金
全国重点实验室基金资助项目(No.2023-KJWPDL-14)。
关键词
时间敏感网络
时间同步
同步精度测量
网络管理控制
time-sensitive networking
time synchronization
synchronization accuracy measurement
network management and control
