Chinese Journal on Internet of Things ›› 2020, Vol. 4 ›› Issue (1): 92-103.doi: 10.11959/j.issn.2096-3750.2020.00151

Special Issue: 6G

• Topic:IoT and 6G • Previous Articles     Next Articles

Massive access technology in 6G cellular Internet of things network

Feiyan TIAN,Xiaoming CHEN,Caijun ZHONG,Zhaoyang ZHANG   

  1. College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China
  • Revised:2020-02-16 Online:2020-03-30 Published:2020-03-28
  • Supported by:
    National Key R&D Program of China(2018YFB1801104);Natural Science Foundation of China(61725104);Natural Science Foundation of China(61871344);Natural Science Foundation of China(61922071)


To realize Internet of everything (IoE),the 6G cellular Internet of things (IoT) network need to provide wireless access with low power,massive connectivity and wide coverage.Through the analysis and research on the massive access technology in 6G cellular IoT network,especially in combination with the sporadic characteristics of IoT applications,a new access framework based on the grant-free random access protocol was designed to facilitate efficient massive access with limited spectrum resources.The proposed framework consisted of two phases.One was joint activity detection and channel estimation.The other was data transmission,which was divided into two categories,uplink data transmission and downlink data transmission,according to the different directions of data transmission.Due to the uncertainty of channel state information at the base station under the massive grant-free random access and considering the low power demand of 6G IoT devices,two robust uplink and downlink access algorithms were designed by maximizing the system energy efficiency.Extensive simulation results validate the effectiveness and robustness of the proposed algorithm.

Key words: 6G, cellular Internet of things, massive access, energy efficiency, low power, massive connectivity, wide coverage

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