Dynamically Optimizing End-to-End Latency for Time-Triggered Networks
Dynamically Optimizing End-to-End Latency for Time-Triggered Networks
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DOI：
10.1145/3341558.3342203
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
Zonghui Li;Hai Wan;Boxu Zhao;Yangdong Deng;M. Gu
中科院分区：
文献类型：
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作者：
Zonghui Li;Hai Wan;Boxu Zhao;Yangdong Deng;M. Gu
在时间触发（TT）网络中，用于工业控制的帧（所谓的TT帧）被静态地调度为在精确的发送点处被发送。同时，剩余的帧，所谓的BE帧，用尽力（BE）策略转发。TT帧通过调度最坏的情况来满足特定于应用程序的端到端延迟要求。此外，计划中的发送点往往使他们无法尽快交货。然而，BE帧被尽快传输，但不能保证有限的延迟，甚至导致帧丢失，由于排队，拥塞等，在本文中，我们提出了一个BE辅助TT通信协议（最佳TT协议），以动态优化端到端的延迟TT帧的机会主义地利用BE传输。给定TT帧，BEST TT协议生成用BE策略传输的克隆副本。无论是TT帧还是其副本，到达终端设备的第一个帧最终被传送，而另一个帧被忽略。因此，该协议确保最终递送的帧的延迟不会比TT帧的延迟差。我们实现了行业实力的TT交换机的协议，并提出了三个测试方案，以证明其优化与以前的国家的最先进的TT传输。
In time-triggered (TT) networks, frames for industrial control, so-called TT frames, are statically scheduled to be transmitted at precise sending points. Meanwhile, the remaining frames, so-called BE frames, are forwarded with best-effort (BE) strategies. TT frames meet application-specific end-to-end latency requirements by scheduling the worst cases. Furthermore, the planned sending points tend to prevent them from delivering as soon as possible. However, BE frames are transmitted as soon as possible but not assure bounded latency even lead to loss of frames due to queuing, congestion, etc. In this paper, we propose a BE assisted TT communication protocol (BEST TT protocol) to dynamically optimize end-to-end latency of TT frames by opportunistically taking advantage of BE transmission. Given a TT frame, the BEST TT protocol generates a cloned copy that is transmitted with the BE strategies. Whichever the TT frame or its copy, the first frame arriving at the end device is finally delivered and the other frame is ignored. So, the protocol ensures that the latency of the final delivered frame is not worse than that of the TT frame. We implement the protocol in an industry-strength TT switch and present three test scenarios to demonstrate its optimization compared with the previous state-of-art TT transmission.