Telecommunications Science ›› 2022, Vol. 38 ›› Issue (Z1): 77-92.doi: 10.11959/j.issn.1000-0801.2022110

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A survey of key issues of URLLC in industrial internet of things

Han WANG1, Lei DIAO1, Mengling WANG1, Xin RONG1, Jiamin LI1,2, Xiaohu YOU1,2   

  1. 1 National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
    2 Purple Mountain Laboratories, Nanjing 211111, China
  • Revised:2022-03-09 Online:2022-05-31 Published:2022-05-01
  • Supported by:
    The National Key Research and Development Program(2021YFB2900300);The National Natural Science Foundation of China(61971127);The National Natural Science Foundation of China(61871465);The National Natural Science Foundation of China(61871122)


In the age of 6G internet of things, massive terminal devices are connected intelligently to explore environmental information to improve life quality and create a more intelligent world.With the development of economic society and industry, the number of industrial nodes in the industrial internet of things (IIoT) grows at an significant speed.The real-time transmission and exchange of information between these industrial nodes puts forward higher requirements for communication delay and reliability.Under limited time-frequency resources and strict communication quality requirements, in order to ensure ultra-reliable and low-latency communication (URLLC) of massive terminals in IIoT, it is necessary to analyze the existing key problems from the aspects of low delay, reliability, energy efficiency, spectrum efficiency and scalability.In the scenario of IIoT, combined with the characteristics and requirements of URLLC, the key issues of communication in IIoT were studied, including challenges and opportunities in active user detection, random access, resource allocation and convergence of communication and computation.After summarizing and analyzing the key issues and existing technologies, the future research direction was proposed.

Key words: IIoT, URLLC, random access, resource allocation, convergence of communication and computation

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