選擇性隔離資料流以提升時效性網路零抖動傳輸的可調度性

Abstract

時效性網路 (TSN) 可以提供乙太網路上的即時通訊，對於工業自動化和車載 通訊等工業情境非常重要。時效性網路可為乙太網路的傳輸提供低延遲、低抖動及可靠度的保證。需要零抖動的資料流常用於需要精確通訊才能運作的工業場景。目前可提供零抖動保證的方法需要將資料流個別隔離到佇列中，限制了整體網路的吞吐量。我們透過時間感知整流器 (Time-Aware Shaper，TAS)，並將流量隔離的約束放寬到僅選定的佇列的方式來傳輸零抖動流量。我們的模型也支援線上排程的情境，確保新資料流的排程不會干擾正在運行的流量。實驗結果顯示我們的方法可以提升了 11% 零抖動資料流的排程。

Time-Sensitive Networking (TSN) enables real-time communication over Ethernet networks, which is vital in industrial scenarios such as industrial automation and in-vehicle communication. TSN can provide low latency, jitter, and reliability guarantees for the Ethernet packets. Traffic that requires zero jitter is commonly used in industrial scenarios, where devices require precise communication to operate. To ensure a zero-jitter guarantee, earlier approaches isolated traffic into dedicated queues, but this came at the expense of overall network throughput. In this paper, we utilize the Time-Aware Shaper (TAS) to synthesize schedules for zero-jitter traffic by relaxing isolation constraints to selected hops only. Our scheduling model also supports online scheduling scenarios, ensuring that newly accepted traffic does not interfere with the transmission of the previously scheduled traffic. Our evaluations show that our Earliest Window First algorithm can compute schedules that support 11% more zero-jitter traffic on average.