Study On The Key Technology Of Handover In High-speed Railway

With the fast development of high-speed railway, as well as the increasing demand for high-speed transmission and high volume, the deployment of the next generation wireless communication network in railway in high-speed railway and relay technology have become more and more widely popular. International Union of Railways have identified that the next generation wireless communication network in railway will be based on LTE. However, the technical standards for LTE-R are still in the research and mobile communications in high-speed railway are still facing lots of problems. For different communication environment, handover schemes are proposed in this article. Furthermore, the corresponding theoretical analysis and performance simulation are carried out.The research based on LTE network, and take high-speed railway environment into consideration Firstly, we analyze the demand of high-speed railway to communication system, discuss the feasibility of the evolution, GSM-R to LTE-R, and compare them. Besides, we introduce the related background of LTE, with emphasis on its handover technology. Furthermore, considering the special needs of high speed railway, we propose the handover schemes in different scene.In the scene of a railway station, the introduction of the vehicle relay brings a great improvement on the communication system performance. Meanwhile, compared with traditional handover scheme, the proposed scheme further improves the performance of frequent handover and handover failure rate. In the scene of running, the new system architecture and handover scheme are proposed by the introduction of multi-antenna technology and bi-casting. Through the introduction of train index, wireless resource would be allocated ahead, which simplifies the handover procedure. The proposed scheme improves the handover failure rate and communication interruption rate when the trains run at high speed. It verifies the effectiveness of the handover algorithm to improve system performance through numerical calculation and simulation analysis.