Design And Implementation Of Wireless Communication System In Metro

The wireless communication system is one of the most important subsystems in the Metro communication system, it guarantees the subway vehicle can safely, high density, hi gh-efficient operation. The main function of system is between the mobile personnel sub way operation range or mobile personnel and fixed personnel calls and data transmission.Thi s design uses a networking mode full base stationnetwork construction, all stations are resp ectively provided with a2carrier frequency base station. The use of antennapattems on ea ch platform halls and side platform area ofsignal strength coverage, using a leaky coaxial c able to the interval of signal strength coverage, in depots, parking signalfield erection omnid irectional antenna top cover, indoor area of weak field by using reinforcement coverage syst emcorresponding to the room, with a small control centerantenna cover.This paper is based on the TETRA terrestrial radio trunking system, research and desi gn a set of wirelesscommunication system in metro. The main content includes the functio n design, system design, system of wireless coverage system research of handover technolo gy design,more area to system architecture design, system capacityplanning. And on the ba sis of the original system, the design of the system related content development two times, including two times to develop car function and system function, system development and s ystem two times two times development scheduling server function, system two times the d evelopment of dispatching desk function, systemdevelopment two times fixed station carrie r function. In order to improve the design work of the system, studied thewireless commun ication system in metro transfer station in interference, wireless signal interference, differen t linesystem electromagnetic interference and the correspondingmeasures to reduce the inte rference. At the same time for the whole system, the network management function is desi gned. Finally, at the end of the article related testcontent of main equipment in subway wir eless communication system and network management softwareare described.This design finally has carried on the test to the system mainequipment and network management software, the use of1TETRA switches,1sets of original TETRA network m anagement,1sets of two times the development of network management terminal,1two ti mes the development ofnetwork management server,2sets of scheduling server,3sets o f scheduling table,2base stations,1table,1sets offixed stalls Taiwan,4sets of handset an d other equipmentset up the testing environment. The main test of wirelesssystem base sta tion equipment transmitting/receivingfrequency, relative error and related power, call and i nformation transfer function of wireless system of vehicleequipment, call and information tr ansfer function of wirelesssystem of fixed equipment, system network management softwar e startup/shutdown, parameter setting, alarm and other functions.