摘要
针对交换式以太网用于工业实时通信时不能确保数据按时送达问题,在通信站点和交换机端引入IEEE802.1p优先级服务机制,通过设置实时优先级字段来区分其不同的紧急程度的实时数据帧,并采用非抢占式固定优先级调度算法改善实时数据帧的传输时延.通过将调度分析法和网络演算法相结合,提出了一种混合的实时数据帧传输时延上界计算方法.比较研究表明该方法得到的结果比网络演算法更准确.
To overcome the drawback that the switched Ethernet does not guarantee the timely delivery of real-time data in industrial communication,IEEE802.1p queuing feature was introduced into both Ethernet switches and communication nodes to give real-time data the priority to access network. In addition,real-time priority field was introduced into real-time data frames to differentiate their emergency degree,and non-preemptive fixed priority scheduling method was applied to improve the end-to-end delay of real-time data. By combining worst-case response time analysis method and network calculus approach,a hybrid method to optimize upper bound of end-to-end delay of real-time data was also proposed. A comparison study showed the advantage of the method.
出处
《微电子学与计算机》
CSCD
北大核心
2010年第5期148-152,共5页
Microelectronics & Computer
基金
国家自然科学基金项目(60873003
60873195)
关键词
交换式工业以太网
非抢占式固定优先级调度
最大时延
最坏响应时间
switched industrial ethernet
non-preemptive fixed priority scheduling
maximum time delay
worst-case response time
