Revisiting Acknowledgment Mechanism for Transport Control: Modeling, Analysis, and Implementation
Revisiting Acknowledgment Mechanism for Transport Control: Modeling, Analysis, and Implementation
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DOI：
10.1109/tnet.2021.3101011
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
Tong Li;Kai Zheng;Ke Xu;R. Jadhav;Tao Xiong;Keith Winstein;Kun Tan
中科院分区：
文献类型：
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作者：
Tong Li;Kai Zheng;Ke Xu;R. Jadhav;Tao Xiong;Keith Winstein;Kun Tan
无线介质的共享特性导致了数据传输和反向信令（如确认）之间的争用。当前的TCP确认方式会带来控制开销，这对TCP性能产生不利影响，特别是在无线局域网（WLAN）场景下。在本文中，我们提出了一个新的确认称为TACK（“Tame ACK”），以及它的TCP实现TCP-TACK。TACK寻求最小化ACK频率，这正是传输所需要的。TCP-TACK工作在商用WLAN之上，以ack的形式以最小的控制开销提供高无线传输速率，无需任何硬件修改。评估结果表明，由于数据包和ack之间的争用较少，TCP- tack在WLAN场景中比传统TCP具有显著优势。具体来说，TCP-TACK减少了90%以上的ack，并且在good - put上也获得了高达28%的改进。基于tac的协议是遗留TCP的良好替代品，可以补偿确认开销不可忽略的场景。
The shared nature of the wireless medium induces contention between data transport and backward signaling, such as acknowledgment. The current way of TCP acknowledgment induces control overhead which is counter-productive for TCP performance especially in wireless local area network (WLAN) scenarios. In this paper, we present a new acknowledgment called TACK (“Tame ACK”), as well as its TCP implementation TCP-TACK. TACK seeks to minimize ACK frequency, which is exactly what is required by transport. TCP-TACK works on top of commodity WLAN, delivering high wireless transport goodput with minimal control overhead in the form of ACKs, without any hardware modification. Evaluation results show that TCP-TACK achieves significant advantages over legacy TCP in WLAN scenarios due to less contention between data packets and ACKs. Specifically, TCP-TACK reduces over 90% of ACKs and also obtains an improvement of up to 28% on goodput. A TACK-based protocol is a good replacement of the legacy TCP to compensate for scenarios where the acknowledgment overhead is non-negligible.