摘要
以交换式工业以太网网络控制系统为研究对象,针对采用IEEE 802.1p优先权调度的交换机内部排队延迟,提出了调度改进构想,对硬实时数据流和非硬实时数据进行区别处理.构建了一个典型的树形拓扑交换式以太网模型,计算了优先权调度改进后周期性实时数据帧在各个传输环节的最大延迟,同时推导了优先权调动改进方案应满足的基本条件.最后通过OPNET软件进行了仿真验证,结果表明IEEE 802.1p优先权调度协议改进可以提高工业以太网中硬实时数据传输的实时性.
The switched Ethemet control system is chosen as study object. In view of the interior queuing delay in switches using IEEE 802.1p priority scheduling protocol, the scheduling improvement idea is proposed, and hard real-time and non hard real-time data flow are managed respectively. A typical switched Ethernet model with tree topology is designed, the maximum delay of periodic real-time data frame in every transmitted part after priority scheduling is calculated, and the basic conditions in improved priority scheduling protocol are derived. The OPNET software simulation shows that the suitable improvement of IEEE 802.1p priority scheduling protocol can improve the real-time performances of hard real-time data transmission in the industrial Ethernet.
出处
《信息与控制》
CSCD
北大核心
2012年第1期117-122,128,共7页
Information and Control
基金
国家自然科学基金资助项目(61034005)
