AI 中文总结
针对具有拓扑层次、无环路径和多路径路由的网络，提出基于Katz中心性的AQM部署策略，可提升网络稳定性并保障低延迟运行，经仿真验证有效。
AI 中文摘要
过长的队列延迟是对延迟敏感的网络应用的重要阻碍。尽管主动队列管理（AQM）策略的有效部署被认为是必要的解决方案，但目前的部署仍较为稀少。本文研究一类特定网络中的AQM部署，这类网络中的路由器/交换机具有拓扑层次结构，形成无环路径并采用多路径路由。我们的方法基于一个成熟的前提：AQM部署会影响承载TCP流的网络中的分组转发动态，从而在稳定性与网络性能之间建立直接联系。我们使用流体模型对网络中的TCP和队列动态进行建模，结合一种简单的基于阈值的队列策略，构建网络的闭环模型。稳定性分析显示，当TCP流的平均往返时间（RTT）增加时，网络易受不稳定影响；但当在合适的路由器中部署基于阈值的AQM时，网络能在不丧失稳定性的情况下容忍大得多的RTT。我们随后定义一种基于Katz中心性的指标，以选择部署AQM的最合适路由器，并论证这样做能确保最大的稳定效果。最后，分组级仿真证实，所提出的部署策略可确保网络的低延迟运行。
英文摘要
Excessive queueing delays constitute a significant impediment to latency-sensitive network applications. Although effective deployment of Active Queue Management (AQM) strategies has been proposed as a necessary solution, deployment remains sparse. This paper studies AQM deployment in a specific class of networks where routers/switches have a topological hierarchy, form acyclic paths, and adopt multipath routing. Our approach rests on the well-established premise that AQM deployment impacts packet-forwarding dynamics in networks carrying TCP flows, thus establishing a direct link between stability and network performance. We use fluid models for TCP and queue dynamics in the network, along with a simple threshold-based queue policy to outline a closed-loop model for the network. Stability analyses reveal that while the network is vulnerable to instability as the average round-trip time (RTT) of the TCP flows increases, it tolerates a much larger RTT without losing stability when the threshold-based AQM is deployed in an appropriate router. We then define a Katz centrality-based metric to choose the most appropriate router for AQM deployment, and argue that doing so ensures the greatest stabilising effect. Finally, packet-level simulations corroborate that the proposed deployment strategy ensures low-latency operation of the network.
