Quality Evaluation And Comparison Of Construction Modes Of Wireless Communication Network Based On High-speed Railway Scenario

China is a vast country with uneven distribution of resources and population.The flow of people,logistics and information needs to be redistributed and flowed rapidly by various means.As an important form of land transportation,high-speed railway,with its high operating speed and efficiency,high security level and carrying capacity,low level of energy consumption,provides a carrier for the exchange of resources and personnel all over the country,and greatly promotes the rapid development of modern social economy.At present,the operating mileage of high-speed railway in China has reached 25,000 kilometers,covering more than 90% of the resident population.More than 4,000 EMUs are operated in China every day,and more than 4 million passengers are transported.High-speed railway has not only changed people's travel modes and space-time concepts,but also triggered changes in people's production,lifestyle and economic transformation and development.The continuous iterative development of high-speed railway technology brings comfortable and fast travel experience to passengers,but also poses more challenges to the wireless communication network along the high-speed railway.The traditional network coverage mode can not meet the needs of wireless communication users in high-speed environment.This paper evaluates the quality of existing high-speed rail wireless networks by using relevant evaluation methods,and makes a comparative study of the construction schemes of high-speed rail wireless networks,which provides decision-making reference for network optimization and planning scientifically and rationally.Specific research contents are as follows:(1)Starting from the difficulties of wireless coverage of high-speed rail,the effects of Doppler shift,shielding of train carriages and frequent handover on users' use are emphatically analyzed.(2)According to the characteristics of high-speed railway wireless coverage,the quality evaluation model of high-speed railway wireless network is established with access index,maintenance index,perception index and network health as the core,which serves as the basis for the evaluation of high-speed railway wireless network.(3)Taking Jiangxi section of Shanghai-Kunming high-speed railway as an example,the weight of each index of the evaluation model is calculated by analytic hierarchy process,and then the membership grade of Jiangxi section of ShanghaiKunming high-speed railway under this evaluation model is obtained by the method of fuzzy comprehensive evaluation.(4)Comparing the planning schemes of high-speed railway wireless network from five aspects: network coverage effect,investment cost,impact on the existing network,implementation complexity,and maintenance convenience in the later period,and applying them in the planning and construction of Chang-Gan high-speed railway network.To sum up,this paper conducts multi-angle and multi-index evaluation research on the quality of high-speed railway wireless network,and constructs a comprehensive evaluation system based on user's wireless network usage perception by using analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method,which provides a theoretical reference for the quality evaluation of highspeed railway wireless network.At the same time,the application of relevant research methods to the planning and construction of high-speed rail wireless network has realistic reference significance for improving the rationality of the coverage planning of high-speed rail wireless network,improving the quality of the network and ensuring the business perception of high-speed rail users.