Study On Switching Performance Enhancement Schemes In Heterogeneous Networks Under High-speed Environment

Recently,with the accelerating pace of high-speed railway construction,the scale of the growing,urgent also need to match the mobile Internet,wireless communication technology,mobile data service in rate,continuity and smoothness,high stability,etc,more need to further improve.Speed and high iron closed structure design of the car,will bring penetration loss,frequent switching,doppler effect and so on many issues,traditional in high speed railway network environment to provide a better mobile Internet services has obvious shortage.Heterogeneous network for the above questions put forward solutions from the aspects of network architecture,therefore,this paper designed a heterogeneous vehicle-mounted mobile Internet based on the pattern of relay access architecture,to enhance the quality of network communication in the switching process.The main research contents are as follows:Firstly,to introduce reasons of heterogeneous network and briefly elaborated the development course,and emphatically analyzes the current commonly used broadband wireless access technology and mobile communication technology,integration of heterogeneous network deployment.At this stage a variety of wireless access technology of the respective service area and the user environment is different,heterogeneous network to incorporate various types of wireless network,can make them in a common network platform provides a variety of business;At the same time,the formation of the heterogeneous network can change some information communication network coverage area are independent of each other,each other not repeat the problem such as area,to train users anytime,anywhere access to the wireless network to obtain a service.Then,it studies the application of on-board mobile relay technology in heterogeneous network,and proposes a multi-link soft switching scheme in heterogeneous network.To improve the wireless connection when handoff performance of high speed railway and the real-time quality of service of the business,will train car relay at the same time keep connection with multiple heterogeneous network link,to switch a link in process,through other link to maintain connections,to achieve the goal of seamless switching.The design scheme is compared with the two-layer network scheme applied in the existing high-speed railway,which can better guarantee that the wireless connection is not interrupted in the heterogeneous network.Switching performance analysis and simulation results show that the multilink switch can switch through wireless connection fails to effectively reduce the influence of failure,in order to achieve the enhancement purpose to the high speed railway communication performance.Finally,the application of multi-antenna technology in heterogeneous network is analyzed and designed,and the optimal switching scheme of multi-antenna technology combined with pre-handover strategy is proposed.Caused by a lack of signal power when the handoff,such as large time delay problem is more serious,led to the suspension of communication link in the process of often switch,in order to solve this problem,this article will multi-antenna technology used in the base station by the side of the road to produce diversity gain,and in front of the switch by implementing resources reserve spectrum resources to reduce costs,improve the success rate,in order to achieve the purpose of improving switching performance.Then the theoretical comparison analysis and simulation results verify that the optimal switching scheme of multi-antenna technology combined with the pre-switching strategy is obviously better than the traditional switching scheme in the improvement of switching success rate.