Application Of LTE Technology In Urban Rail Transit PIS Vehicle-Ground Wireless System

With the continuous improvement of China’s urbanization rate,the population flow to the city leads to the sharp increase of urban population,and the travel pressure of public transport continues to increase.The construction of urban rail transit is an important means to solve the pressure of public transport.Nowadays,with the rapid development of communication network and information digitization,urban rail transit industry has entered a new era of science and technology.The main research topic of this paper is the application of LTE technology in the vehicle ground wireless communication of urban rail transit PIS(passenger information system).The function design and practical application of PIS in the train ground wireless communication system under the condition of LTE technology are described in detail.The paper focuses on the following three aspects to reflect my work content and the project background,design process and final research conclusion.First of all,the background and significance of the paper are described,and the research status at home and abroad is introduced.This paper analyzes LTE network structure,function,network protocol and main technology,and the demand analysis of urban rail transit PIs train ground wireless communication system.Through the comparison of wllan,LTE and Wi MAX technologies,the feasibility and superiority of LTE technology in urban rail transit vehicle ground wireless communication are verified.Secondly,the paper introduces the structure and function of the PIS system of Lanzhou Urban Rail Transit Line 1,and according to the characteristics of Lanzhou Urban Rail Transit Line 1 PIS system,it gives the networking scheme and network security deployment of the train ground wireless communication system of line 1;it also gives the coverage scheme of station,section and depot of line 1;it uses the wireless network management software of train ground to improve the daily relevant parameters Line monitoring.Finally,the LTE network performance of Lanzhou Urban Rail Transit Line 1 is tested to verify the superiority of LTE technology.At the same time,the key indicators of LTE network optimization,such as SINR,reference level rsrp and uplink and downlink throughput,are tested.Finally,in the process of the LTE network optimization,the handover delay,inter cell handover band length,handover drop and ping-pong handover are tested The problems are analyzed and solutions are given.Theoretical analysis is carried out for the possible interference in line 1,and the solution is given,which is verified by simulation software.