Research On Service Modeling And Resource Scheduling In High-speed Rail Communication

High-speed railway private network communication not only transmits safe and reliable train control services,but also transmits other abundant services.Greater data throughput and higher communication efficiency are required to provide in the communication system.The most common high-speed railway communication system is still GSM-R(Global System of Mobile communication for Railways),but its performance can not meet the development of high-speed railway.LTE-based high-speed railway communication system is seen as the future development direction and its related technology is worth studying.Accordingly,the research of service modeling and resource scheduling are very important.The main work of this paper is as follows:1?The service characteristics of the railway transit proprietary service is studied by classification according to different principles first.The general process and method of services modeling are analyzed,and according to the research conclusions,the railway transit services are modeled and the service parameters are explained in detail.2?The resource scheduling on the high-speed railway system are researched.The general flow of resource scheduling in LTE system is introduced,and then the characteristics of resource scheduling in high-speed rail scenarios are analyzed.The RAD(Required Activity Detection)algorithm is introduced in detail,and then an improved RAD algorithm based on the current traffic buffer is proposed for t high-speed rail scenarios.3?Based on the 3GPP(the 3rd Generation Partner Project)protocol,the lab team built the LTE-R(Long Term Evolution-Railway)system-level dynamic simulation platform,the proposed services modeling and resources scheduling algorithm are simulated.The simulation results meet the theoretical recommendations of the rail transit services,which reflects the rationality and reliability of the services modeling method proposed in this paper.Compared with the original RAD algorithm,the improved RAD algorithm has significantly improved the key QoS(Quality of Service)indicators such as packet throughput and packet transmission delay.