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

As the operation mode of urban rail transit turns to the direction of service-oriented development,PIS(Passenger Information System)System is the driving force.At present,WLAN(Wake on Local Area Network)technology is adopted in many urban PIS systems as vehicle-based information and communication technology,However,when the train runs at high speed,there will be a large control information overhead,frequent inter-zone switching,more interval equipment,etc.,which puts forward a higher demand for the selection of vehicleground wireless technology.LTE(Long Term Evolution,the Long Term Evolution)technology as a kind of real-time,security,and anti-jamming wireless access technology,can in the high speed train running,ensure enough bandwidth wireless transmission meet the requirements of PIS system,excellent service quality guarantee system and network reliability,a wireless device switch mechanism compared with other mechanism is more comprehensive.It is a key technology of efficient new vehicle-ground wireless communication transmission.In this paper,vehicle-to-ground wireless communication of PIS system based on LTE technology is taken as the research object and detailed analysis is carried out.Firstly,the paper analyzes the load carrying demand of vehicle-ground wireless communication broadband,conducts statistics on bandwidth,compares and selects service load carrying schemes,and proposes that PIS is used for comprehensive load carrying.This paper analyzes the alternative technologies of vehicle-ground wireless communication,and proposes that LTE technology is suitable for vehicle-ground wireless communication system.Focus on the research of LTE technology principle and two key technologies,and get the advantages of LTE technology in application.From the theoretical perspective,the promoting effect and functions of LTE technology on vehicle-to-ground wireless communication system are analyzed to better meet the requirements of two-way video transmission.Secondly,relevant application research and network design are carried out for the integrated carrier of vehicle-ground wireless communication based on LTE technology by PIS system.Analysis of PIS system structure and function of LTE train-ground wireless system from general design,web design,interface design and other aspects,and detailed analysis of LTE in the car to the specific design scheme in wireless communication system,and put forwards the suggestion of resource sharing,reduce construction cost and operation cost saving investment,optimize human resources allocation in maintenance department.Finally in Changchun urban rail transit project,for example,starting from the actual engineering project environment,analysis of Changchun urban rail transit project train-ground communication system,car technical parameter requirements of wireless devices,wireless switch cover design,system design,etc.,through the site information,test results and other data,validated LTE PIS in Changchun city rail transit application of wireless communication system can meet various performance indicators standards,to LTE was applied to the car to the construction of the wireless communication system and the cover design,etc.To provide scientific reference.This is used as the verification purpose to carry out the verification scheme,so as to ensure that LTE technology can play a good effect in the actual application process.The study in this paper provides a certain application reference for LTE technology in vehicle-ground wireless communication of urban rail transit PIS system.