Sender Control of Delayed Acknowledgments in TCP: Problem Statement, Requirements and Analysis of Potential Solutions

Document Type Expired Internet-Draft (individual)
Authors Carles Gomez  , Jon Crowcroft 
Last updated 2020-09-27 (latest revision 2020-03-26)
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TCP Delayed Acknowledgments (ACKs) allow reducing protocol overhead in many scenarios. However, in some cases, Delayed ACKs may significantly degrade network and device performance in terms of link utilization, latency, memory usage and/or energy consumption. This document presents the problem statement regarding sender control of Delayed ACKs in TCP. The document discusses the scenarios and use cases in which sender control of Delayed ACKs offers advantages. Then, requirements for a potential solution are derived. Finally, a number of potential solutions are discussed, based on the requirements, and also considering pros and cons in each case.


Carles Gomez (
Jon Crowcroft (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)