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YUAN Liang, CHEN Zhenping. Overview of time synchronization technology for underground coal mine IoTs perception layer[J]. Industry and Mine Automation, 2021, 47(11): 1-8. doi: 10.13272/j.issn.1671-251x.17845
Citation: YUAN Liang, CHEN Zhenping. Overview of time synchronization technology for underground coal mine IoTs perception layer[J]. Industry and Mine Automation, 2021, 47(11): 1-8. doi: 10.13272/j.issn.1671-251x.17845
shu

Overview of time synchronization technology for underground coal mine IoTs perception layer

doi: 10.13272/j.issn.1671-251x.17845

  • 1. School of Energy and Safety, Anhui University of Science and Technology, Huainan 232001, China;

  • 2. School of Electronic and Information Engineering, Suzhou University of Science & Technology, Suzhou 215009, China

  • Received Date: 2021-09-26
  • Rev Recd Date: 2021-11-02
  • Publish Date: 2021-11-20
    Abstract
  • Time synchronization is the basis and prerequisite for precise information perception in intelligent mines.Many characteristics of underground space in coal mines, such as narrow and long terrain and uneven surface of the roadway, can cause large cumulative effect of synchronization error and poor reliability of signal transmission, which brings great challenges to the research of time synchronization technology among wireless nodes.Two basic time synchronization methods, hierarchical time synchronization and distributed time synchronization method, are introduced in this paper.The special requirements of time synchronization methods for underground coal mine IoTs are analyzed.In addition to the convergence and synchronization precision, the energy efficiency, the topology robustness and the scalability of the synchronization algorithm need to be considered as well.The method should have less communication volume, longer synchronization period and certain topology robustness.Moreover, the method should be able to reduce the cumulative effect of synchronization error caused by large network diameter, and adapt to impact of network scale changes.The current research status of time synchronization of underground coal mine IoTs perception layer is analyzed, and it is concluded that the current research results mainly focus on network structure, synchronization precision and synchronization energy consumption.The research direction of time synchronization technology for underground coal mine IOTs perception layer is prospected, and it is pointed out that the focuses of future research is to design a time synchronization method with certain robustness to topology and time delay in the context of the particularity of underground communication environment and space environment in coal mine: ① It is suggested to improve the robustness of time synchronization method to topology from the perspective of topology dynamic maintenance.② It is advised to improve the convergence speed of consistent time synchronization method from the perspective of communication topology virtual construction.③ It is proposed to improve the robustness of time synchronization method to transmission delay from the perspective of timestamp processing and matrix completion.

     

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