Transmission Control Protocol (TCP) controlling congestion by peer-to-peer is challenging to handle communication with numerous concurrent TCP flows and heavy traffic loads. Therefore, TCP requires the active queue management (AQM) to assist in avoiding buffer bloat in intermediate devices. Thus, Some AQM controllers, such as Red, Codel, and Pie, have been proposed to control congestion better. However, these controllers are unable to overcome the drawbacks, including micro-burst streams, unfair competition of flows with different workloads, as well as sluggishly responding to congestion in heavy traffic, which degrade the performance of data transmission. To address these problems, in this paper, we proposed a queueing-delay-based AQM controller for TCP/AQM systems, namely PID-R. PID-R adopts two-level control components, i.e., the Proportional-Integral-Derivative (PID) algorithm and the recursive least squares (RLS) filter, and combines the advantages of the two parts. Meanwhile, we also constructed a new TCP/PID-R fluid model derived from TCP/AQM classical model. According to the model, PID-R parameters are determined to keep the TCP/PID-R system steady. The comprehensive simulation reveals that PID-R outperforms the state-of-the-art AQM controllers.

中文翻译：

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用于 TCP/AQM 系统的强大 PID 和 RLS 控制器


通过点对点控制拥塞的传输控制协议 (TCP) 对于处理具有大量并发 TCP 流和繁重流量负载的通信具有挑战性。因此，TCP 需要主动队列管理 (AQM) 来帮助避免中间设备中的缓冲区膨胀。因此，一些AQM控制器，如Red、Codel和Pie，被提出来更好地控制拥塞。然而，这些控制器无法克服一些缺点，包括微突发流、不同工作负载的流的不公平竞争以及对大流量拥塞的响应迟缓，从而降低了数据传输的性能。为了解决这些问题，本文提出了一种用于 TCP/AQM 系统的基于排队延迟的 AQM 控制器，即 PID-R。 PID-R采用两级控制元件，即比例积分微分（PID）算法和递归最小二乘（RLS）滤波器，并结合了两部分的优点。同时，我们还基于TCP/AQM经典模型构建了新的TCP/PID-R流体模型。根据该模型确定PID-R参数以保持TCP/PID-R系统稳定。综合仿真表明 PID-R 的性能优于最先进的 AQM 控制器。