The IEEE 802.15.4a standard provides a framework for low-data-rate communication systems,typically sensor networks.In this paper,we established a realistic environment for the time delay characteristic of industrial n...The IEEE 802.15.4a standard provides a framework for low-data-rate communication systems,typically sensor networks.In this paper,we established a realistic environment for the time delay characteristic of industrial network based on IEEE 802.15.4a.Several sets of practical experiments are conducted to study its various features,including the effects of 1） numeral wireless nodes,2） numeral data packets,3） data transmissions with different upper-layer protocols,4） physical distance between nodes,and 5） adding and reducing the number of the wireless nodes.The results show that IEEE 802.15.4a is suitable for some industrial applications that have more relaxed throughput requirements and time-delay.Some issues that could degrade the network performance are also discussed.展开更多
介绍了EPA(Ethernet for plant automation)标准的确定性通信调度方法,分析了EPA实时性能指标,重点研究了在网络拓扑给定的情况下,递交时间、时钟同步精度、网络吞吐量、非实时通信带宽和冗余恢复时间等实时性能指标的测试方法,并开发了...介绍了EPA(Ethernet for plant automation)标准的确定性通信调度方法,分析了EPA实时性能指标,重点研究了在网络拓扑给定的情况下,递交时间、时钟同步精度、网络吞吐量、非实时通信带宽和冗余恢复时间等实时性能指标的测试方法,并开发了EPA实时性能测试平台并进行了测试应用,给出了EPA系统的测试评判。展开更多
基金supported by National High Technology Research and Development Program of China (863 Program)(No. 2007AA04Z174,No. 2006AA04030405)National Natural Science Foundation of China (No. 61074032,No. 60834002)
文摘The IEEE 802.15.4a standard provides a framework for low-data-rate communication systems,typically sensor networks.In this paper,we established a realistic environment for the time delay characteristic of industrial network based on IEEE 802.15.4a.Several sets of practical experiments are conducted to study its various features,including the effects of 1） numeral wireless nodes,2） numeral data packets,3） data transmissions with different upper-layer protocols,4） physical distance between nodes,and 5） adding and reducing the number of the wireless nodes.The results show that IEEE 802.15.4a is suitable for some industrial applications that have more relaxed throughput requirements and time-delay.Some issues that could degrade the network performance are also discussed.
文摘介绍了EPA(Ethernet for plant automation)标准的确定性通信调度方法,分析了EPA实时性能指标,重点研究了在网络拓扑给定的情况下,递交时间、时钟同步精度、网络吞吐量、非实时通信带宽和冗余恢复时间等实时性能指标的测试方法,并开发了EPA实时性能测试平台并进行了测试应用,给出了EPA系统的测试评判。
