Abstract
Nowadays, most communication based train control systems (CBTC) use Wireless Local Networks (WLAN) technology for information transmission. However, because of the high running speed of the train in urban rail transit, WLAN technology cannot fully satisfy the information transmission under the condition of train operation at a high speed. Long term evolution (LTE) technology has a high transmission speed, which can better meet the real-time requirements of train and ground information transmission. Therefore, LTE technology has become an emphasis on the research of communication technology in today’s urban rail transit. Although there is a lot of research on the application of LTE technology in urban rail transit, there is little research on the reliability of LTE based train ground communication systems using experimental data. In this paper, the reliability of train ground communication is firstly defined. Then the train ground communication environment was established in the laboratory, and the performance parameters of train ground communication based on LTE technology were obtained in the test. Finally, the reliability is calculated and analyzed according to the experimental results, and a storage method of train data in actual operation is proposed, which can be used to analyze the reliability of train information transmission. The results show that the reliability of train ground communication based on LTE technology meets CBTC requirements.
Highlights
In the process of national economic development, rail transit played a signi cant role
The reliability evaluation of the communication based train control systems (CBTC) system based on Long term evolution (LTE) technology is carried out. e main content of this paper is as follows: (1) We describe the framework and analyze the requirements of CBTC systems
We can see that even under an unfavorable con guration which are at 1.4 MHz bandwidth and low RSRP, the train ground communication system still has high reliability, indicating that LTE technology can complete the communication of train and ground and meet the requirements of the urban rail transit system
Summary
In the process of national economic development, rail transit played a signi cant role. Safe and e cient rail transit has laid a solid foundation for high-tra c passenger transport and high-speed freight transport. With the acceleration of China’s urbanization process, people have put forward higher requirements for urban rail transit, and its reliability is the most important. Urban rail transit possesses the characteristics of high speed and high tracing density. Urban rail transit adopts CBTC systems as train control systems. E CBTC system can trace the train operation closely according to the situation of the forerunning train and the forward route. The minimum train tracking interval can reach the 90 s or less [1, 2], which can e ectively shorten the train tracking interval and signi cantly improve transport e ciency [3]
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