An Efficient Scheduling Algorithm for Adjustable Time Slots in Time-Triggered Ethernet

Meichen Liu, Hongxi Yin, He Li, Xiuyang Ji
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Abstract

When a network scale for the traditional Ethernet is continuously expanded, an increase of the number of network hops will result in an augment of waiting delay uncertainty for a service transmission, which makes the network inefficiency and difficult to guarantee service quality. The time-triggered Ethernet adopts the global time synchronization and time triggering mechanism to ensure the service quality of high-priority services such as spaceflight tracking telemetry and control, network security, and vital signs monitoring, which possesses broad applications in aerospace, medical aid, and vehicle network. Currently, the time-triggered Ethernet triggers a time-triggered stream by employing an offline generated scheduling schedule, and is difficult to adapt to dynamic changes of a network, which leads to the network rigidity and inefficiency. Therefore, this paper proposes an algorithm for generating time-triggered schedules that can adjust time slots, flexibly. The time-triggered Ethernet prototype system is designed by utilizing the TrueTime, and the process of generating the scheduling table to trigger the time-triggered stream is simulated. Compared with the existing traditional algorithm, our algorithm can adjust the time slots according to the ratio of time-triggered streams to traditional traffic in the network, which can improve the time utilization rate by 30%.
时间触发以太网中一种有效的可调时隙调度算法
当传统以太网的网络规模不断扩大时,随着网络跳数的增加,业务传输的等待时延不确定性也会增大,从而导致网络效率低下,服务质量难以保证。时间触发以太网采用全局时间同步和时间触发机制,保证了航天跟踪遥测控制、网络安全、生命体征监测等高优先级业务的服务质量,在航空航天、医疗救护、车载网络等领域具有广泛的应用前景。目前,时间触发型以太网通过离线生成的调度调度来触发时间触发流,难以适应网络的动态变化,导致网络的刚性和低效率。因此,本文提出了一种可灵活调整时隙的时间触发调度算法。利用TrueTime软件设计了时间触发以太网原型系统,并对生成调度表触发时间触发流的过程进行了仿真。与现有的传统算法相比,我们的算法可以根据网络中时间触发流与传统流量的比例来调整时隙,提高了30%的时间利用率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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