The Design And Implementation Of A High-speed Rail Mobile Communication Network

Since the completion of the first high-speed railway Qinshen Passenger Dedicated Line in 2002,China's high-speed railways have achieved rapid development during the past ten years.At the same time,after several major speed increases,the operation speed of high-speed rails has reached 350km/h,greatly shortening.Travel time.The continuous development of high-speed rail technology also puts forward higher requirements for mobile communication technologies.The traditional communication coverage model cannot meet the needs of high-speed rail mobile communication users.To do a high-speed rail network coverage of mobile communications has become a problem that operators need to solve urgently.This article takes the LTE network coverage of high-speed railway as the research object.According to the features of the high speed railway communication network,a detailed high-speed railway LTE network planning and construction plan is formulated,and combined with the actual situation of Chengpu High-speed Railway and the optimization case of Xicheng High-speed Rail,it is designed for Chengpu High Speed Rail.A complete and feasible network construction plan.The fast moving characteristics of high-speed railways will aggravate the Doppler shift effect and affect the demodulation of base stations and terminals.The rapid movement of user terminals will also cause frequent cell handovers,affecting the call quality of users and even causing dropped calls and disconnection.High-speed trains are fully enclosed.The special materials of carriages and car bodies make the high-speed trains have large penetration losses,and put forward higher requirements for the transmission power and receiving sensitivity of base stations and terminals;the high-speed rail lines have diverse scenes and increase the difficulty of network deployment.This article takes the high-speed railway LTE network coverage as the research object,develops a detailed high-speed railway LTE network planning and construction plan according to the characteristics of the high-speed railway LTE network,and formulates a detailed network coverage plan for the Xicheng High Speed Rail in conjunction with the actual situation of the Xicheng High Speed Rail,and finally conducts network testing.And refer to the test results to optimize the adjustment work.The first part analyzes the network coverage characteristics of high-speed railway scenes,including the Doppler frequency shift effect,frequent cell switching caused by high-speed movement,and high penetration loss of trains.The second part summarizes and analyzes the mainstream planning and design of high-speed rail,and discusses the network coverage model,frequency selection,link budget,capacity estimation,station configuration,site setting,antenna setting,neighboring area setting,and tracking area setting.The coverage scheme of high-speed railway LTE system is analyzed,and the characteristics of different high-speed railways are analyzed,and coverage scenarios are formulated.The third part analyzes the line conditions of Xicheng High Speed Rail and combines the analysis result of the previous section to formulate a reasonable network coverage plan for Xicheng High Speed Rail TD-LTE network.At the same time,analyze the possible interference of F-band of Xicheng High Speed Rail TD-LTE system,and discuss the causes of interference and methods of avoiding interference.Finally,analyze the supporting construction principles and programs of Xicheng High Speed Rail,including the supporting of the tower,the supporting of the equipment room and the matching of the power supply.In the fourth part,taking the test and optimization of high-speed railways as an example,the high-speed railway LTE system test and optimization methods are analyzed.Aiming at the problems of weak coverage,poor quality,low rate and low CSFB call success rate in the Westing High Speed Rail network test,a detailed analysis was made and a targeted solution was proposed.At the end of the paper,the main work of the full text and future research directions are summarized.