关键词: 多功能车辆总线, 非周期数据, 时间片轮询算法, 实时调度

Abstract:

According to the train communication network and multifunction vehicle bus network realtime transport protocols, the authors presented a dynamic priority roundRobin algorithm. Multifunction vehicle bus (MVB) is used widely in train communication networks to realize interconnection among different devices. It must meet the realtime performance while multifunction vehicle bus is used to transmit data according to the ICE613751. In the multifunction vehicle bus network, the delay among transmission equipments mainly includes waiting to be sent delay and transmitting the data packet delay and so on. Based on the priority of nonperiodic data to achieve arbitration scheduling, the algorithm can improve the realtime performance of multifunction vehicle bus network to transmit the nonperiodic data by means of optimizing the complexity of algorithm and reducing waiting delay and blocking delay. The simulation analysis shows that the algorithm can improve the realtime performance and fairness performance of MVB transmission. At the same time, the algorithm also meets the requirements of the ICE61375-1.

Key words: multifunction vehicle bus (MVB), nonperiodic data, round Robin algorithm, realtime performance