Research On High-speed Rail Wireless Network Cell Handover Technology

The high-speed railway is speeding up.The promotion of speed has provided great convenience for passengers.The increase of speed also caused the problem of frequent switching.Therefore,higher requirements for mobility management of communication system were put forward,especially fast switching control.In the aspect of wireless signal delay and signal difference,it has brought great inconvenience to the user experience of high-speed rail passengers.To sum up,switching interruption time and switching performance are the main factors limiting the switching of high-speed rail wireless network.LTE(Long Term Evolution)technology is a model of integration of mobile communication technology and broadband wireless access technology.However,the current LTE network adopts hard switching method,need to pass in the process of switching eNodeB(Evolved Node B base station)the interface between the data forwarding,produce large time delay switch,at the same time the poor quality of received signal switching area,were difficult to decode correctly.Therefore,which cannot meet the switching demand of modern high-speed railway wireless network.This paper proposes a switching optimization scheme based on CoMP(Coordinated multi-point multi-point transmission)technology and Bi-casting technology,CoMP technology is adopted in the empty port,and the Bi-casting technology is adopted in S1 port,with only one set of signaling binding CoMP and Bi-casting triggering,which greatly reduces the system complexity.At the same time,because the information required for a large number of switches has been stored in the corresponding network element entities in the CoMP and Bi-casting triggering,the switching process is simplified to the service cell renewal process.LTE switching mechanism,the switching delay of the control surface of the scheme is reduced,the interruption rate is reduced and the success rate is improved.The system throughput rate of the user is also improved,and the data interrupt phenomenon is eliminated.Therefore,the network based on the technology of CoMP technology and Bi-casting area switching technology from two aspects of probability and delay of switching performance has a larger increase,can use the Internet to high-speed mobile passengers a better user experience,both calls and data receiving and sending is moresmooth,so the switch mode is more suitable for high speed moving train.