基于流优先级的车载以太网调度策略实现

Realization of Vehicle Ethernet Scheduling Strategy Based on Flow Priority

在车载通信系统中,控制类任务对实时性要求严苛,信息娱乐类任务则对带宽要求较高。若这两类任务产生的数据同时在以太网上传输,则网络会产生拥塞,导致控制数据传输延迟不确定。依据任务的时间敏感程度,中央网关将相应IP地址和网络端口的数据流调度到特定队列;终端协议栈针对不同类任务,采用基于优先级的发送策略。在搭建的模拟车载网络中进行实验,结果证实了该方案的有效性。该方案的实施在一定程度上改善了时间敏感数据流的实时性,从而证实了TSN标准的有效性和必要性。

In the vehicular communication system,control tasks have strict requirements on real-time performance,while infotainment tasks have higher requirements on bandwidth.If the data generated by these two types of tasks are transmitted on the Ethernet at the same time,the network will generate congestion,resulting in uncertain control data transmission delay.According to the time sensitivity of the task,the central gateway schedules the data flow of the corresponding IP address and network port to a specific queue.The terminal protocol stack adopts a priority-based sending strategy for different types of tasks.Experiments were carried out in the simulated vehicle network,and the results verified the effectiveness of the strategy.The implementation of this scheme has improved the real-time performance of time sensitive data streams,thus proving the effectiveness and necessity of TSN standard.