基於分布式模型的TSN之時間感知資料流保留機制

Abstract

在過去十多年，許多乙太網路協議被提出以解決實時通信的挑戰。然而，因為工業自動化及工業4.0的發展，乙太網路面臨新的挑戰:靈活性。即時敏感網路(TSN)具有確定性通信及分離控制和數據傳輸架構的特性，使得它可以動態配置網路。目前已有些方法被提出來解決集中式TSN的(重新)配置問題，但由於其計算非常複雜，不適合用於分布式TSN。在本文中，我們提出了一種基於時隙(time-slot)的資料流保留機制，該機制通過消除低優先度資料流的影響來提供分布式TSN的低延遲保證。實驗結果顯示，與頻寬保留機制相比，我們基於時隙(time-slot)的保留機制可以提高可排程性，並具有穩定的端到端延遲。

Due to the requirements of real-time communication, many Ethernet protocol had been proposed to deal with this challenge in the past decades. However, the evolution of Industrial Automation and Industry 4.0 faces a new challenge, which is flexibility. Time-Sensitive Networking (TSN) features its deterministic communication and the separated control plane and data plane architecture, which can configure networks dynamically. Several prior works have addressed the (re)configuration problem for centralized TSN, but it is not suitable for distributed TSN because of the complex calculations. In this paper, we propose a time-slot based stream reservation mechanism, which provides distributed TSN low delay guarantees by eliminating the influence of lower priority streams. Experimental results show that compares to bandwidth reservation, our time-slot based reservation mechanism can enhance schedulability and have a stable end-to-end delay range.