Research On High-Speed Railway Scenario In TDD-LTE Communicatoin System

Since2005, LTE has been researched as a standard of3GPP. LTE has a better ability, including higher data rate, lower delay, better cover, better frequency efficiency, and larger mobile support. Especially for the mobile ability, LTE has a higher demand. LTE could support the speed of350km/h(even500km/h at some frequency).This article firstly studies the interference between High-speed rail private network and macro cell public network under TDD-LTE system. According to the characteristic of High-speed rail private network, this article takes the semi-dynamic simulation method to study. Then, against the interference result, this article puts forward three interference reduce method based on antenna changing and also offers interference result after reducing. The above study shows great reference value to constructing and planning of telecommunication network of High-speed rail.Through the research we could find out that, when working at the same frequency, the throughput has a better enhance. At scenario A (ISD=1732meters), the throughput of repeater has a better enhance, the lowest throughput enhanced from40%to57%, average throughput loss is5%to7%, which could satisfy the requirement of communication; While at scenario B (ISD=500meters), the loss of repeater is higher, the lowest throughput is below10%, and the average throughput loss is69%to75%, which requires new solutions.