Application Of TD-LTE Mobile Communication Technology In Lanzhou Urban Rail Transit

This thesis is the application of TD-LTE mobile communication technology in Lanzhou Urban Rail Transit.Firstly,it is through the current development of LTE technology and the application of LTE technology in urban rail transit domestic and foreign,introduce the system and function of TD-LTE mobile communication technology.Through the comparison and selection of several mainstream wireless communication technologies used in the current urban rail transit communication system,from the aspects of service load,reliability,and mobility,LTE was finally adopted as the PIS vehicle-to-ground wireless communication system solution for Lanzhou Rail Transit Line 1.The design content of this project mainly includes system scheme composition,source survey and layout,equipment and material selection,construction drawing design and project quantity statistics.In Lanzhou Rail Transit Line 1,the Passenger Information System vehicle-to-ground wireless communication system adopts the TD-LTE wireless communication technology network.Combined with the line condition of Lanzhou Line 1 and the user requirements of wireless communication of PIS,the corresponding LTE wireless communication system solution is proposed.The LTE baseband control unit BBU and RRU are installed in the stations,the control center and the metro depot to construct the entire PIS vehicle-to-ground Wireless communication network.This thesis details the business requirements and solutions for the Lanzhou Rail Transit Line 1 vehicle-to-ground wireless communication system.The analysis of the actual line test results from Lanzhou University Station to Donggang Station on Lanzhou Rail Transit Line 1 proves that PIS-LTE wireless communication system is designed to meet the system's business needs and has good performance.During the design process,I also faced some difficulties,such as the problem of signal interference between systems.Bandwidth isolation requirements for signals from other frequency bands are proposed through calculations.Among them,the China mobile DCS1800 frequency band is adjacent to the LTE system frequency band,and it is difficult to solve the problem of signal interference by means of bandwidth isolation.After discussion,the DCS1800 frequency band was not introduced into the subway range to ensure the system runs reliably.Finally,combined with the existing LTE integrated bearer case,from the aspects of reliability,concurrency,maintainability,etc.,the development prospects of the future TD-LTE wireless communication technology in the rail transportation industry are discussed.