列车通信网络的可靠性是保证列车安全稳定运行的前提,根据列车通信网络的需求,构建一种并行传输的网络架构,通过改进的并行冗余协议PRP提高基于以太网的列车通信网络的可靠性.对PRP协议的冗余机制进行研究,针对PRP协议存在的问题,结合列车通信并行网络的需求,改进并行冗余协议的数据发送机制以及冗余算法.根据重要性对传输的数据进行分类并采取不同的传输策略:重要数据采用并行传输方式,能够使其故障恢复时间减小为零,保证了网络的可靠性;非重要数据采用交替传输方式,以缓解传输时的网络带宽压力.网络仿真结果验证了采用并行冗余协议的列车通信网络的可靠性.%High-reliability of the train communication network is the prerequisite to ensure the safe and stable operation of the train .According to the communication requirements of train communication network ,this pa-per designed a network architecture using two parallel subnetworks ,the reliability is enhanced by the improve-ment of parallel redundancy protocol (PRP) .The redundancy mechanism of the PRP is analyzed in this paper . Combined with the communication requirements of parallel train communication network ,this paper optimizes the data transmission mechanism and redundancy processing algorithms of PRP .The data is classified by im-portance and transmitted by different strategies .The recovery time of the important data can be reduced to zero using the way of parallel transmission ;alternate transmission of the secondary data can reduce the bandwidth pressure during normal running of the network .The simulation results show that train communication network using parallel redundancy protocol can provide high reliability service of the communication .
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