Research On The Coverage Of The Wireless Network Under High-Speed Mobile Environment

The railway speed in China has been accelerated for six times during the past decade andthe speed of the main railway lines has been raised to200km per hour. During the "11thfive-year plan" period, China will further build19,800kilometers of railway lines, amongwhich5,457kilometers will reach a speed of over300km per hour.With the construction and development of the high-speed rail in our country, railtransport is more and more important as a kind of transport in socio-economic status. Theoperators are also more and more attention to the wireless coverage of the high-speed railwaynetwork. At present, the main coverage method for high-speed rail is to use the repeaters.However, such method is slightly weaker in the correction of Doppler shift and interferencecontrol. The coverage of high-speed railway method discussed in this article is based ondistributed base station. Comparing with the method of using the repeaters, the method in thisarticle is better in the network quality and the handover success rate.Firstly, this article analyzes the wireless environment of the high-speed railway. And thisarticle also analyzes the Doppler shift, the loss of the train, the communication flow and theperformance of the antenna with a high speed. From the analysis of above, it summed up thedifficulties faced by the wireless communication terminal in a high-speed mobile environmentand theoretical solutions. Secondly, over the comparative analysis of the methods of thehigh-speed railway public network and high-speed railway private network, and with thecombination of the equipment, antenna system selection method, it summed up constructionmethod of the actual private network of high-speed railway. This method includes the designof the antenna, the design of the handover and the design of the parameters. Finally, thisarticle analyzes the feasibility by using the computer simulation and the drive test, and alsogives some suggestions for the optimization of the network. The suggestions for theoptimization of the network will help the operators to improve the network coverage andimprove the network quality. By comparing with the traditional coverage method, this article also discusses the advantages of the method. This method is better in the network quality, theoptimization and the maintenance and also the upgrade.