Traffic Modeling And Performance Monitoring Of Ethernet Based Train Communication Network

In recent years,our country’s high-speed rail industry has developed rapidly.The Chinese standard EMU of Fuxing with independent intellectual property rights marks that our country’s EMU manufacturing industry has reached the international leading level.As the level of train intelligence continues to increase,the number of terminals and devices connected to the train communication network is gradually increasing,so the types of data transmitted and the amount of data are also increasing.The traditional busbased train network has been widely used because of its advantages of good real-time performance and high stability,but its transmission rate is low,and the scalability is poor.The future train communication network needs to have large throughput and flexible networking abilities.Obviously the traditional train communication network can’t meet this requirement.Therefore the International Electrotechnical Commission IEC promulgated a new train communication network standard.The train communication network was designed based on Ethernet technology for the first time in the standard.Although Ethernet has obvious advantages,its reliability and real-time defects will affect the real-time control performance of trains,thereby posing a threat to train operation safety.Therefore,it is necessary to study the performance of the Ethernet-based train communication network to verify the feasibility of upgrading the train communication network from the traditional bus-based train network to the Ethernet-based train network,and to ensure the stability and stability of the deployment of Ethernet in the train communication network reliability.The main contents of this paper are:(1)In order to evaluate the communication quality of the Ethernet-based train communication network,a test system was built on the intelligent EMU to collect the train-level and vehicle-level network bearing service data of the train communication network,and the data was analyzed.According to the analysis results,the Ethernet-based The train communication network performance is evaluated(2)According to the characteristics of the process data in the train communication network TRDP protocol,the train communication network service carrying capacity is modeled and analyzed,and the built model is used to evaluate the probability of network congestion.(3)Build a real-time train communication network monitoring system based on the TRDP protocol of the train real-time data protocol to monitor network performance,focus on the push mode of the process data,design and develop a TRDP-based sender data simulation generator to simulate the train communication network.At the same time,design the interference injection module of the TRDP data transmission system to simulate the delay jitter and packet loss during the data transmission process,and optimize the authenticity of the transmitted data.Finally,a test platform is built to verify the performance of the monitoring system,which is divided into non-interference and interference tests.According to the analysis results of the receiving end,the correctness and usability of the data simulation generator at the sending end is proved.