基于交换式以太网的TCN设计与实时性能分析

Design and real-time performance analysis on Switched Ethernet based Train Communication Network

针对传统列车通信网络(TCN)难以满足下一代列车通信网络大容量、实时性的数据传输需求,本文提出基于交换式以太网的列车通信网络(EB-TCN)解决方案,建立了EB-TCN拓扑结构和通信协议栈模型。为了保证EB-TCN的实时性,在通信协议栈中加入实时虚拟层,通过集中式主从调度机制调度底层以太网资源。最后对骨干层和车辆控制层的实时性进行理论分析。新方案较大地提高网络带宽同时,能保证网络的确定性和实时性,能很好地满足传统TCN传输数据的要求,能够成为TCN网络的替代方案。

Since traditional train communication network（TCN） was difficult to meet the need of real-time, large-capacity data transmission of the next generation TCN, this paper presented a solution of Ethernet Based- Train Communication Network（EB-TCN）, given EB-TCN network topology and communication protocol stack. In order to ensure real-time requirement of EB-TCN, the paper added real-time virtual layer in the communication protocol stack and schedules underlying Ethernet resource by using centralized master-slave scheduling mechanism. Finally, the paper theoretically analyzed real-time performance of the backbone layer and the vehicle control layer. The conclusion was that this new program could improve the network bandwidth, ensure determinism and real-time, satisfy the traditional requirements of network communication. EB-TCN could be alternative to the TCN.