The journey of a thousand miles begins with traffic. Traffic is the lifeblood of the economy, and we have to deal with various means of transportation every day, and traffic safety matters. In an interview with Xie Feibo, Director of the Radio Administration Bureau of the Ministry of Industry and Information Technology, Xie Feibo said that radio technology plays an increasingly important role in ensuring people's travel safety and improving the efficiency of transportation systems. In terms of highway traffic, radio applications including non-parking tolls, radar traffic flow monitoring, traffic and road condition information collection, and car navigation and positioning make car driving smoother and more efficient. In terms of rail transit, radio applications and systems such as wireless train dispatch communication, vehicle number automatic identification system, safety monitoring and protection, and train operation control system guarantee the safe driving of trains including high-speed rail.
Troubleshoot GSM-R frequency band interference and escort high-speed rail
For railway radio dedicated frequencies, especially GSM-R frequency bands, it is necessary to accelerate the improvement of protection standards, specifications and mechanisms.
After rapid development in recent years, China has become a major high-speed rail country with the highest operating mileage in the world. The safe operation of high-speed rail cannot be separated from the escort of the GSM-R, a special mobile communication system for railways. At the beginning of 2010, the Ministry of Industry and Information Technology and the Ministry of Railways jointly issued the "Notice on the Establishment of a Long-term Mechanism for the Protection of Railway Radio Specific Frequency", which set forth requirements for the protection of national railway radio dedicated frequencies.
Xie Feibo pointed out that with the continuous development of railway construction, the frequency usage along the railway is more complicated. Therefore, for railway radio dedicated frequencies, especially the GSM-R frequency band, it is necessary to accelerate the improvement of protection standards, specifications and mechanisms to further ensure the safe use of high-speed rail radio frequencies.
He told reporters that China's high-speed train transportation communications, signals and dispatching commands all use the GSM-R train control system. This system is a comprehensive dedicated digital mobile communication system designed specifically for railway communications. It mainly has wireless train scheduling, marshalling and shunting communications, Voice communication functions such as emergency communication and tunnel communication also provide data transmission channels for automatic train control and detection information, which can achieve seamless communication coverage in the operating speed range of 200 to 500 kilometers per hour, so the normal operation of the GSM-R wireless communication system It is the core and key to ensure the safety of high-speed train transportation.
The reporter found in the interview that there are still some blind spots in the current special frequency protection work of the railway, such as: fixed monitoring equipment has limited reach, and mobile monitoring vehicles are greatly affected by the terrain. What's more, high-speed rail often passes through viaducts, and its electromagnetic environment is inconsistent with automobile lines, and the measured data often cannot reflect the real interference situation. For the existing GSM-R system, whether it is an existing fixed monitoring system or a mobile monitoring system, the above two reasons make the railway dedicated frequency protective monitoring inefficient, and the monitored spectrum data cannot reflect the real use Happening. In addition, railway drivers or dispatchers lack radio expertise, and in many cases, it is impossible to accurately express interference characteristics, which also makes traditional protection methods less predictable and less proactive.
In this regard, the Zhejiang Provincial Economic and Information Commission Management Bureau suggested that in actual monitoring, the radio management agency can coordinate with the relevant railway departments to jointly develop a dedicated receiver or use the existing locomotive radio station of the railway department, from the dedicated antenna of the railway locomotive radio station. Transfer signals or install a monitoring antenna separately, develop special drive test software and install satellite positioning or driving distance recording equipment, regularly simulate and monitor the real-time communication quality of the entire section on the vehicle. This method will improve the working efficiency, initiative and predictability of railway GSM-R frequency protection.
Xie Feibo requested that the radio regulatory agency and the railway department should strengthen coordination and collaboration. The railway department should report the GSM-R base station information in a timely manner, and plan the station and frequency reasonably; the radio management organization should have a thorough grasp of the distribution of base stations and repeaters of the operators along the high-speed railway, the transmission power and frequency, and the distance from the high-speed railway line, etc., and establish a fast Respond and troubleshoot the GSM-R interference mechanism to be prepared.
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