The Planning And Optimization Of CDMA Network In High-speed Rail Environment

With the continuous advancing of national railway speed increase strategies,the high-speed rail which is represented by multiple units has been integrated into people’s daily life.High-speed rail,due to its advantages like rapid speed and convenience,is being chosen as the best intercity transportation means by more and more people,with passenger flow volume increasing rapidly and meanwhile the telephone traffic showing great potential.Therefore,how to improve the coverage quality of CDMA network along the high-speed rail has become an increasingly important issue,and the particularity of the high-speed rail wireless environment poses great challenges and pressure to the coverage planning and optimization of the high-speed rail network.This paper describes the current situation of the communication network in the high-speed rail scene,in view of the difficulties like high-speed running,large train-body penetration loss,frequent inter-cell handover,and the complicated surroundings along the high-speed rail,formulating a program suitable for the CDMA wireless network in Harbin-Dalian high-speed rail through studies on Doppler shift,the link budget between the base station and the mobile phone,the location distribution of the high-speed rail stations,the research of coverage methods inmultiple high-speed rail scenes as well as the analysis and budget of the high-speed rail linear capacity.On the basis of the above CDMA network planning,this paper continues to study the CDMA wireless network coverage optimization of Harbin-Dalian high-speed rail in Heilongjiang Province.Moreover,based on theparticularity of high-speed rail environment,this paper establishes an effective optimization process and puts forward specific strategies for the coverage optimization,switching optimization,parameter optimization,private and public network fusion optimization and the adoption of the same PN technology.Finally,taking the Harbin-Dalian high-speed rail in Heilongjiang Province as an example,it finds out the solution to particular problems in high-speed rail scene,enhancing the high-speed rail users’ perceptionultimately.