Research On The WCDMA Network Optimization Of Changzhou Section In Beijing-shanghai High-speed Railway

With the rapid development of economic society,China Railway has stepped into the "high-speed railway era." Because of its security,high speed and comfortable experience,high-speed railway has become the first choice for today's travel.While the train is in the high-speed running state,the wireless network will be a new challenge as the mobile communication signal Doppler shift frequency and the closed compartment which has a greater penetration loss.In order to protect the normal communication quality of the passengers and enhance the user perception,it is necessary to optimize the wireless network structure of high-speed railway.The first part of this thesis introduces some basic knowledge of the structure optimization of high-speed rail wireless network.It introduces the characteristics of wireless electromagnetic wave propagation in high-speed environment and analyzes the model of wireless electromagnetic wave propagation.It also discusses three kinds of networking modes: public network,private network,public network and private network.The advantages and disadvantages of these three networking methods were compared in detail.Then,based on the theory of wireless network structure optimization,this thesis makes a deep analysis on the combination mode of private network,and gives the solution to a layout of high-speed wireless network and the link between antenna.The propagation model and traffic model are deduced,and some suggestions are given for constructing the network in different scenarios.According to these theoretical bases,the practical problems encountered in the Changzhou section of the Beijing-Shanghai high-speed railway are optimized and improved.Some problems has been solved,traffic test and index analysis has been done for the optimized structure,and so does the real-network optimization.Based on the wireless network of Changzhou section of Beijing-Shanghai high-speed railway,the optimization of the structure has been realized: optimization of station spacing,optimization of vertical distance from base station to antenna-feed setting.The content of this thesis has a strong guiding significance for practical work.