基于QoS的NCS网关调度研究

Research on Scheduling of Gateway in NCS Based on QoS

NCS网络控制系统是指控制回路通过网络进行闭合的反馈控制系统,网络的引进给控制系统的信息传输带来了延迟、信息丢失等问题,降低了控制系统的性能。针对这些问题,着重研究了将不同的子网络分为不同的D ifferentiated Service域(DS域),对数据流使用QoS中的DS字节标签。按照不同服务等级,提出预留网络带宽、出口链路速率加权优先级分配等数据包流优化调度。通过MATLAB中的SIMUEVENTS对所提出的网关数据包流的优化调度策略进行仿真,并将仿真结果与基于传统以太网的NCS进行比较。

The network control system is referring to a feedback control system in which the control loops are closed through network. The involvement of network in control system brings problems to information transmission, such as time delay and loss of information, thus the performance of control system becomes poor. Aiming at these problems, the sub-networks are divided into differentiated service （DS） domains, and the DS byte tag in QoS is adopted in data stream. Based on different service level, the optimal scheduling of data packet streams, includirtg preserved bandwidth of network and the priority distribution in way-out link, etc. , is proposed. Through SIMUEVENTS in MATLAB, the proposed scheduling strategy is simulated and the simulation result is compared with that of NCS based on traditional Ethernet.