GSM-R Railway Mobile Communication Dynamic Detection Research And Implementation Of Key Technologies

With the rapid development of high-speed railways and passenger dedicated lines in China,the GSM-R digital mobile communication system has gradually been established and improved.However,the dynamic detection method of GSM-R railway mobile communication can no longer meet the needs of the current development of high-speed railway,and the frequent cross-zone switching has also affected the stability of railway communication.Establishing a dynamic detection method model of GSM-R and optimizing the algorithm of cross-region switching have become the current research direction.In terms of structure,the model detection method of dynamic detection is simple and comprehensive,and it is functional and operable.In dynamic detection,cross-region switching failures often occur,so how to optimize the cross-region switching algorithm has become the focus of research.In this thesis,the GSM-R railway mobile communication and dynamic detection methods are studied,and the better railway communication stability is achieved by improving the dynamic detection method and optimizing the cross-zone switching algorithm,and its specific work is as follows:(1)Introduced the technical development of dynamic detection of digital mobile communication systems,the current situation of development in European countries such as Germany and the current situation in China,and the different needs of the two for scheduling commands and wireless vehicle numbers lead to different physical functions of GSM-R system dynamic detection.At the same time,the structure of GSM-R Hohhot Co.,Ltd.and the main business it currently holds are also analyzed.(2)The principle of dynamic detection of digital mobile communication system is introduced,and the GSM-R dynamic detection structure and framework of Hohhot Co.,Ltd.are constructed.According to the principle of electromagnetic environment,the test time,place and frequency band selection are determined.The sampling interval of the field strength coverage test is derived by Li’s law,and the actual interval is much smaller than the derived value,and the accuracy of the field strength test for the complex terrain of Inner Mongolia is improved,which makes the situation that the weak field cannot be controlled in the past two years.(3)Combined with the specific applications of China’s railway-to-vehicle joint control and the characteristics of railway communication networks,the dynamic detection model of railway communication is divided into physical layer,service bearing layer and application layer.Thus,in practical applications,in-vehicle equipment and ground equipment are divided.This thesis relies on the project of China Railway Hohhot Bureau Co.,Ltd.to conduct dynamic detection and verification of the newly opened line from Wulanchabu to The Eastern Section of Hohhot of Zhanghu Railway,and verifies the functions through nearly one year,and the results meet the communication requirements of the Railway Corporation for the newly opened line.(4)The interference model is established and eliminated for the radio interference in the detection,and the electromagnetic interference is analyzed according to the performance parameters of the system.During the daily inspection of the new online,it is found that the failure rate of cross-zone switching is high,and this is optimized.This thesis proposes the optimized PBGT switching algorithm,which is compared with the traditional PBGT algorithm,in the actual railway operation process through the train travel direction,the location of the train,the speed of the car and other more diverse information,improve the more reliable algorithm of cross-area switching,because the current railways are using the power budget switching algorithm,this thesis will make full use of the direction of the train and the train wireless number and other basic information points,the use of program software to achieve the update and optimization of the algorithm.The algorithm of selecting optimal cell based on BSC is improved,and the reliability of target cell is improved,the handoff time is reduced,and the handoff quality is improved.The application of this algorithm in practice allows the new on-line problem of frequent cross-zone switching to be solved.