| Summary: | The mine wireless communication system has the advantages of wide communication coverage, convenient connection, good mobility, easy to establish, simple setup and maintenance, etc. It plays an irreplaceable role in in the construction of mine intelligence. The whole mine wireless communication system mainly include WiFi(IEEE 802.11b/g/n/ac), 3G, 4G, 5G and WiFi6(IEEE 802.11ax) system. 3G system is gradually replaced. 4G and WiFi system are gradually reduced. 5G and WiFi6 system are at the initial stage, and will gradually become the mainstream. The 4G, 5G and WiFi/WiFi6 systems are analyzed from the aspects of technical points, main functions and applications. And the advantages and disadvantages of each system are pointed out in this paper. ① The main disadvantage of the mine 4G wireless communication system is that the bandwidth and real-time indicators cannot meet the needs of application scenarios such as high-definition intelligent video and remote control. ② The problems of 5G in practical use are listed as following points. In the case of multiple systems and multiple antennas, there is a security problem of wireless transmission signals. 5G base stations are mainly explosion-proof and intrinsically safe types, which are large in quality and volume. There are problems of inconvenient to use and limited in use. 5G terminal ecology is lacked. The communication modules are expensive and power consumption is high. It does not have the conditions for large-scale industrial applications. There are few practical application cases, and the application scenarios need to be further explored. ③ WiFi6 wireless communication system has high latency, relatively low mobility and reliability. The mobile phone terminal is not mature enough, which affects the quality of voice calls. Based on the above analysis, it is pointed out that the demand of intelligent mine for wireless communication system is the demand of large bandwidth, low latency, high reliability, multi-access, multi-system, multi-interface, and position information. Finally, this study points out the development trend of mine wireless communication system. The trend includes system fusion (wireless communication and wired communication fusion, wireless communication internal fusion, wireless communication system and other system fusion). It also includes communication and positioning integration, equipment intrinsic safety, terminal module low power consumption and protocol interface standardization.
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