多信道多跳网络的时间同步方案  

A Time Synchronization Scheme for Multi-Channel Multi-Hop Network

作　　者：张春玲 白杰 章灵芝 ZHANG Chunling;BAI Jie;ZHANG Lingzhi(Research Institute,State Grid Information&Telecommunication Group Co.,Ltd.,Beijing 100031,China)

机构地区：[1]国网信通产业集团信通研究院,北京100031

出　　处：《电力信息与通信技术》2022年第3期98-103,共6页Electric Power Information and Communication Technology

摘　　要：文章提出一种适用于电力物联网感知层本地通信的时间同步方案。该方案不需要系统通过广播带有时间戳的信标帧进行同步,而是利用MAC层的数据确认帧进行同步,仅在整个同步周期内没有数据发送的情况下,才单播发送时间同步定制包进行同步,大大减少了网络的同步开销。同时,数据确认帧的发送不需要信道访问,降低了信道访问随机时延的影响,保证了同步精度。仿真结果表明,在采用基于8个历史值的线性回归算法时,同步精度可以达到几十微秒,能够满足电力物联网中各种业务的时间同步精度要求。This paper proposes a time synchronization scheme for local communication in the perception layer of power Internet of things.The scheme does not need to broadcast beacon frame with time stamp for synchronization.Instead,it utilizes data acknowledgment frame of MAC layer,and only when there is no data transmission in a whole synchronization period,it unicasts the specified packet for synchronization which greatly reduces synchronization overhead.Data acknowledgment frame does not need channel access which reduces the impact of random channel access delay and ensures synchronization accuracy.Simulation results show that synchronization accuracy can reach tens of microseconds when the linear regression algorithm with 8 historical values is adopted,which can meet the time synchronization accuracy requirements of applications in power Internet of things.

关 键 词：时间同步 确认帧 时钟偏移 时钟频率漂移 线性回归 

分 类 号：TM74[电气工程—电力系统及自动化]