Research On Mobile Communication Networking Strategy In High-speed Railway Scenario

High-speed rail has become a very important means of transportation in today's society.With the large-scale opening of high-speed rail in the country,the number of people who choose to travel by high-speed rail is increasing day by day.In October 2012,Xicheng High-speed Railway was officially started,which lasted five years.In December 2017,it was officially opened to traffic.The Xicheng high-speed rail traversed Qinling Mountains,connecting the two major urban agglomerations in the northwest and southwest China,building a new economic growth pole in Western China,and injecting strong acceleration for the western economic development,which is of great significance to the construction of the western region along the "one belt and one road".The Qinling Mountains stretch for thousands of miles,with numerous tunnels and complex geology.How to build a high-quality mobile communication network to meet the needs of different users of high-speed wireless access at anytime and anywhere is not only the key point of network construction for Telecom operators,but also an important manifestation of the government's broadband strategy in China.Mobile communication network coverage under the high-speed rail scenario has been carried out at home and abroad.From the cuirent situation of networking in various areas,due to the high speed characteristics of high-speed rail,network speed,handover and other indicators are not ideal,it is difficult to compare with large-scale networks,and users 'perception is poor.At the same time,because the wireless environment of each high-speed railway is different and the coverage schemes are quite different,the network coverage of each line will become the focus of operators and Industry Research topics.This paper analyses the principle of TD-LTE technology and the theory of mobile communication network,discusses the content and model of the key points of mobile communication network,and carries out the pros and cons analysis.Based on the current loss model of high-speed rail,combined with the geomorphological characteristics of Shaanxi Province,the factors that may affect the coverage are analyzed,and various problems are analyzed in detail.The corresponding solutions are put forward,and the results of mobile communication networking in high-speed rail scenario are given.The main achievements and innovations of this paper include three aspects.The first aspect is to analyze the characteristics and applicable scenarios of commonly used communication models,compare their advantages and disadvantages,select suitable communication models for high-speed rail scenarios,and carry out calibration work.Aiming at the new structure of domestic mainstream high-speed railway carriage,signal penetration loss test is carried out to determine the typical penetration loss value.Finally,the typical propagation model and path loss value in the high-speed railway scenario are determined.Secondly,aiming at the characteristics of large frequency shift and frequent switching brought by high-speed characteristics in high-speed railway scenario,the switching zone setting is analyzed,and the scheme is given by analyzing its impact on the high-speed railway coverage capacity.Thirdly,according to the above analysis conclusions,combined with the high-speed rail geomorphological characteristics,the paper gives the mobile communication network networking indicators and principles,equipment selection guidance,and networking schemes under common scenarios.The main research object of this paper is TDD-LTE network,and the main application scenario is high-speed rail coverage.At present,outdoor coverage is mainly F-band(1880-1920MHZ),so all kinds of model measurements in this paper are based on F.If D-band is introduced,the application of related models needs to be re-validated.In addition,because LTE and the subsequent 5G network business indicators are quite different,the results of this paper cannot be directly applied in the subsequent 5G stage.The relevant tests should be carried out first,and parameter correction and application should be carried out according to the results.