Congestion control (CC) has a significant influence on the performance of transmission control protocol (TCP) connections. Over the last three decades, many researchers have extensively studied and proposed a multitude of enhancements to standard TCP CC. However, this topic still inspires both academic and industrial research communities due to the change in Internet application requirements and the evolution of Internet technologies. The standard TCP CC infers network congestion based on packet loss events which leads to long queuing delay when bottleneck buffer size is large. A promising solution to this problem is to use the delay signal (RTT or one-way delay measurements) to infer congestion earlier and react to the congestion before the queuing delay reaches a high value. In this survey paper, we describe the delay signal and the algorithms that completely or partially utilize this type of signal. Additionally, we illustrate standard CC and modern active queue management (AQM) principles and discus the interaction between AQM and the delay signal.

中文翻译：

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基于延迟和混合 TCP 拥塞控制算法的综述

拥塞控制 (CC) 对传输控制协议 (TCP) 连接的性能有重大影响。在过去的三十年中，许多研究人员对标准 TCP CC 进行了广泛的研究并提出了大量的增强功能。然而，由于互联网应用需求的变化和互联网技术的演进，这个话题仍然对学术界和工业研究界有启发。标准 TCP CC 根据丢包事件推断网络拥塞，当瓶颈缓冲区大小较大时，这会导致较长的排队延迟。这个问题的一个有前途的解决方案是使用延迟信号（RTT 或单向延迟测量）来更早地推断拥塞并在排队延迟达到高值之前对拥塞做出反应。在这份调查报告中，我们描述了延迟信号和完全或部分利用这种信号的算法。此外，我们还说明了标准 CC 和现代主动队列管理 (AQM) 原则，并讨论了 AQM 与延迟信号之间的相互作用。