## 1 Introduction: The Development of the Mining Industry and the CBTC System  
With the rapid development of mining science and technology, the underground mines all over the world are gradually stepping into the intelligent stage. Although the intelligitization is the ultimate goal of mine development, underground mine faces many challenges in the process of developing toward the intelligitization, especially underground transportation. Frankly speaking, in the past 20 years, many researchers have devoted themselves to the research of intelligent underground mines, including the research of intelligent underground mine transportation [1]. In the year 2020, [PERSON] et al. [1] committed to the research of underground intelligent mine autonomous driverless vehicles, and they made a great breakthrough on the function of Velocity-Free Localization of the underground vehicles. In the same year, [PERSON] and [PERSON] [2] published their research progress of safety monitoring in the underground coal mine, and [PERSON] and [PERSON] [3] achieved the application of Internet of Things technology in the underground mine. Earlier before in 1999, [PERSON] and [PERSON] [4] proposed intelligent control of the underground mine refrigeration system. As early as in 2008, [PERSON] and [PERSON] [5] put forward the intelligent system in underground mine production. While in 2013, [PERSON] [6] made great achievements in the research of underground ventilation monitoring system in coal mine. For underground mines, with the continuous development of mining transportation industry, rail transport has gradually been replaced by trackless transport. However, there is no doubt that the monitoring and control of trackless transportation in intelligent underground mines is not as convenient as that of rail transportation. Therefore, in recent years, some mining enterprises have started to try to run rail transportation in intelligent underground mines, and they achieved good results, especially in China, whose mining industry development is relatively behind. Although rail transportation of the intelligent underground mine is not as flexible as trackless transportation, rail transportation has low operating costs and is widely used. For the above-ground Urban Rail Transit, the CBTC (Communication-based Train Control) system is a common signal control system in the Urban Rail Transit System [7]. Admittedly, the CBTC system is not perfect either, but with the maturity and development of Internet of Things technology, the combination of CBTC system and Internet of Things technology will develop the CBTC system, which has become an academic consensus [8]. The CBTC system has a long history, being first used in practice and having been improved based on IEEE standards [9; 10]. In 2003, [PERSON] [11] noted that the CBTC system was gradually beginning to be piloted worldwide. In 2005, New York began planning to implement the CBTC system according to the report of [PERSON] and [PERSON] [12]. Around 2010, even some Chinese researchers [13; 14] have achieved quite good results in the research of the CBTC system. By the 2010s, the CBTC system had developed rapidly. [PERSON] et al. [15] and [PERSON] et al. [16] put forward some suggestions for optimizing some functions of the CBTC system around 2014. In 2016, [PERSON], [PERSON], and [PERSON] [17] improved the functionality of the WLAN in the CBTC system. Around the year 2017, [PERSON] et al. [7] evaluated the wireless communication network performance of the CBTC system and suggested that the system could be further optimized; [PERSON] and [PERSON] [8] did a survey on the CBTC system, and the survey showed that many researchers believe that the combination of CBTC system and Internet of Things technology could develop the CBTC system. Specially, in the research of [PERSON] et al.