Traffic Identification And Processing Optimization Of Train Control And Service Network

The traditional high-speed train communication(control)network only provides the transmission of control services such as train traction,braking,auxiliary power,door,air conditioning,display and so on.With the development of train’s network technology and the popularization of Internet applications,especially the development and popularization of the mobile Internet service,and the aggravate competition between the transport business,how to provide better service for passengers will be an important direction for the development of high-speed trains in the future.The entertainment behavior of passengers on the journey will become rich and colorful gradually.It will be a novelty and necessary attempt to add the passenger-service in the train network.Previous research on train communication(control)network did not come down to the transmission of passenger services in the network.Since the train control network is integrated with the service network,it is necessary to overcome the problems of the train-control network and train-service network,the diversity of the service network and the pressure brought by the service network of large data,which can guarantee the service quality of the train control business and satisfied the diverse needs of passenger-service and improve the level of train service.The background of this thesis is based on the research of train control and service network(TCSN),the primary coverage of this thesis is the research on the key technical problems of TCSN’s traffic characteristics analysis and classification,business identification,and the simulation of TCSN.There are many kinds of network services in TCSN.In order to manage the messy traffic data packets in the network,this thesis has made a classification,and put the business together which has the same property.This thesis also makes the analysis of the transmission characteristics of every service,and then reasonable network resources will be allocated to them by TCSN.In order to identify the arriving traffic packets quickly,this thesis analyzes and implements a scientific traffic identification method based on the particularity of TCSN services.How to design a reasonable bandwidth-distribution strategy is necessary to TCSN.In this thesis,we have made a suitable service model to solve this problem.Firstly,according to the requirement of service quality,a DSCP has designed for different TCSN business,and the higher value of DSCP,the more network resources can be gotten by this kind of business.In order to get a better flow shaping and scheduling strategy,this thesis has also set up a special service level protocol for TCSN,and designed different network scheduling quotas based on different requirements of different services on bandwidth,time delay and packet loss rate.Finally,in order to verify the rationality of all kinds of design in this thesis,we have designed and realized a TCSN simulation system based on discrete events.And we have analyzed the service’s performance parameters such as time-delay,the rate of packet loss,the ratio of the exceed time delay and the utilization rate of the network in different DSCP values,different SLA values,different users,different bandwidth.