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<!DOCTYPE html>
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<title>QUIC Loss Detection and Congestion Control</title>
<meta content="Jana Iyengar" name="author">
<meta content="Ian Swett" name="author">
<meta content="
This document describes loss detection and congestion control mechanisms for
QUIC.
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<body>
<table class="ears">
<thead><tr>
<td class="left">Internet-Draft</td>
<td class="center">QUIC Loss Detection</td>
<td class="right">January 2021</td>
</tr></thead>
<tfoot><tr>
<td class="left">Iyengar & Swett</td>
<td class="center">Expires 10 July 2021</td>
<td class="right">[Page]</td>
</tr></tfoot>
</table>
<div id="external-metadata" class="document-information"></div>
<div id="internal-metadata" class="document-information">
<dl id="identifiers">
<dt class="label-workgroup">Workgroup:</dt>
<dd class="workgroup">QUIC</dd>
<dt class="label-internet-draft">Internet-Draft:</dt>
<dd class="internet-draft">draft-ietf-quic-recovery</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2021-01-06" class="published">6 January 2021</time>
</dd>
<dt class="label-intended-status">Intended Status:</dt>
<dd class="intended-status">Standards Track</dd>
<dt class="label-expires">Expires:</dt>
<dd class="expires"><time datetime="2021-07-10">10 July 2021</time></dd>
<dt class="label-authors">Authors:</dt>
<dd class="authors">
<div class="author">
<div class="author-name">J. Iyengar, <span class="editor">Ed.</span>
</div>
<div class="org">Fastly</div>
</div>
<div class="author">
<div class="author-name">I. Swett, <span class="editor">Ed.</span>
</div>
<div class="org">Google</div>
</div>
</dd>
</dl>
</div>
<h1 id="title">QUIC Loss Detection and Congestion Control</h1>
<section id="section-abstract">
<h2 id="abstract"><a href="#abstract" class="selfRef">Abstract</a></h2>
<p id="section-abstract-1">This document describes loss detection and congestion control mechanisms for
QUIC.<a href="#section-abstract-1" class="pilcrow">¶</a></p>
</section>
<section class="note" id="section-note.1">
<h2 id="name-note-to-readers">
<a href="#name-note-to-readers" class="section-name selfRef">Note to Readers</a>
</h2>
<p id="section-note.1-1">Discussion of this draft takes place on the QUIC working group mailing list
(<a href="mailto:quic@ietf.org">quic@ietf.org</a>), which is archived at
<span><a href="https://mailarchive.ietf.org/arch/search/?email_list=quic">https://mailarchive.ietf.org/arch/search/?email_list=quic</a></span>.<a href="#section-note.1-1" class="pilcrow">¶</a></p>
<p id="section-note.1-2">Working Group information can be found at <span><a href="https://github.com/quicwg">https://github.com/quicwg</a></span>; source
code and issues list for this draft can be found at
<span><a href="https://github.com/quicwg/base-drafts/labels/-recovery">https://github.com/quicwg/base-drafts/labels/-recovery</a></span>.<a href="#section-note.1-2" class="pilcrow">¶</a></p>
</section>
<div id="status-of-memo">
<section id="section-boilerplate.1">
<h2 id="name-status-of-this-memo">
<a href="#name-status-of-this-memo" class="section-name selfRef">Status of This Memo</a>
</h2>
<p id="section-boilerplate.1-1">
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.<a href="#section-boilerplate.1-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-2">
Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF). Note that other groups may also distribute working
documents as Internet-Drafts. The list of current Internet-Drafts is
at <span><a href="https://datatracker.ietf.org/drafts/current/">https://datatracker.ietf.org/drafts/current/</a></span>.<a href="#section-boilerplate.1-2" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-3">
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."<a href="#section-boilerplate.1-3" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-4">
This Internet-Draft will expire on 10 July 2021.<a href="#section-boilerplate.1-4" class="pilcrow">¶</a></p>
</section>
</div>
<div id="copyright">
<section id="section-boilerplate.2">
<h2 id="name-copyright-notice">
<a href="#name-copyright-notice" class="section-name selfRef">Copyright Notice</a>
</h2>
<p id="section-boilerplate.2-1">
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.<a href="#section-boilerplate.2-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.2-2">
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(<span><a href="https://trustee.ietf.org/license-info">https://trustee.ietf.org/license-info</a></span>) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in
Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License.<a href="#section-boilerplate.2-2" class="pilcrow">¶</a></p>
</section>
</div>
<div id="toc">
<section id="section-toc.1">
<a href="#" onclick="scroll(0,0)" class="toplink">▲</a><h2 id="name-table-of-contents">
<a href="#name-table-of-contents" class="section-name selfRef">Table of Contents</a>
</h2>
<nav class="toc"><ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.1">
<p id="section-toc.1-1.1.1" class="keepWithNext"><a href="#section-1" class="xref">1</a>. <a href="#name-introduction" class="xref">Introduction</a><a href="#section-toc.1-1.1.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.2">
<p id="section-toc.1-1.2.1" class="keepWithNext"><a href="#section-2" class="xref">2</a>. <a href="#name-conventions-and-definitions" class="xref">Conventions and Definitions</a><a href="#section-toc.1-1.2.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3">
<p id="section-toc.1-1.3.1" class="keepWithNext"><a href="#section-3" class="xref">3</a>. <a href="#name-design-of-the-quic-transmis" class="xref">Design of the QUIC Transmission Machinery</a><a href="#section-toc.1-1.3.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.4">
<p id="section-toc.1-1.4.1"><a href="#section-4" class="xref">4</a>. <a href="#name-relevant-differences-betwee" class="xref">Relevant Differences Between QUIC and TCP</a><a href="#section-toc.1-1.4.1" class="pilcrow">¶</a></p>
<ul class="toc compact ulEmpty">
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.1">
<p id="section-toc.1-1.4.2.1.1"><a href="#section-4.1" class="xref">4.1</a>. <a href="#name-separate-packet-number-spac" class="xref">Separate Packet Number Spaces</a><a href="#section-toc.1-1.4.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.2">
<p id="section-toc.1-1.4.2.2.1"><a href="#section-4.2" class="xref">4.2</a>. <a href="#name-monotonically-increasing-pa" class="xref">Monotonically Increasing Packet Numbers</a><a href="#section-toc.1-1.4.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.3">
<p id="section-toc.1-1.4.2.3.1"><a href="#section-4.3" class="xref">4.3</a>. <a href="#name-clearer-loss-epoch" class="xref">Clearer Loss Epoch</a><a href="#section-toc.1-1.4.2.3.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.4">
<p id="section-toc.1-1.4.2.4.1"><a href="#section-4.4" class="xref">4.4</a>. <a href="#name-no-reneging" class="xref">No Reneging</a><a href="#section-toc.1-1.4.2.4.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.5">
<p id="section-toc.1-1.4.2.5.1"><a href="#section-4.5" class="xref">4.5</a>. <a href="#name-more-ack-ranges" class="xref">More ACK Ranges</a><a href="#section-toc.1-1.4.2.5.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.6">
<p id="section-toc.1-1.4.2.6.1"><a href="#section-4.6" class="xref">4.6</a>. <a href="#name-explicit-correction-for-del" class="xref">Explicit Correction For Delayed Acknowledgments</a><a href="#section-toc.1-1.4.2.6.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.7">
<p id="section-toc.1-1.4.2.7.1"><a href="#section-4.7" class="xref">4.7</a>. <a href="#name-probe-timeout-replaces-rto-" class="xref">Probe Timeout Replaces RTO and TLP</a><a href="#section-toc.1-1.4.2.7.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.4.2.8">
<p id="section-toc.1-1.4.2.8.1"><a href="#section-4.8" class="xref">4.8</a>. <a href="#name-the-minimum-congestion-wind" class="xref">The Minimum Congestion Window is Two Packets</a><a href="#section-toc.1-1.4.2.8.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.5">
<p id="section-toc.1-1.5.1"><a href="#section-5" class="xref">5</a>. <a href="#name-estimating-the-round-trip-t" class="xref">Estimating the Round-Trip Time</a><a href="#section-toc.1-1.5.1" class="pilcrow">¶</a></p>
<ul class="toc compact ulEmpty">
<li class="toc compact ulEmpty" id="section-toc.1-1.5.2.1">
<p id="section-toc.1-1.5.2.1.1"><a href="#section-5.1" class="xref">5.1</a>. <a href="#name-generating-rtt-samples" class="xref">Generating RTT samples</a><a href="#section-toc.1-1.5.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.5.2.2">
<p id="section-toc.1-1.5.2.2.1"><a href="#section-5.2" class="xref">5.2</a>. <a href="#name-estimating-min_rtt" class="xref">Estimating min_rtt</a><a href="#section-toc.1-1.5.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.5.2.3">
<p id="section-toc.1-1.5.2.3.1"><a href="#section-5.3" class="xref">5.3</a>. <a href="#name-estimating-smoothed_rtt-and" class="xref">Estimating smoothed_rtt and rttvar</a><a href="#section-toc.1-1.5.2.3.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.6">
<p id="section-toc.1-1.6.1"><a href="#section-6" class="xref">6</a>. <a href="#name-loss-detection" class="xref">Loss Detection</a><a href="#section-toc.1-1.6.1" class="pilcrow">¶</a></p>
<ul class="toc compact ulEmpty">
<li class="toc compact ulEmpty" id="section-toc.1-1.6.2.1">
<p id="section-toc.1-1.6.2.1.1"><a href="#section-6.1" class="xref">6.1</a>. <a href="#name-acknowledgment-based-detect" class="xref">Acknowledgment-Based Detection</a><a href="#section-toc.1-1.6.2.1.1" class="pilcrow">¶</a></p>
<ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.6.2.1.2.1">
<p id="section-toc.1-1.6.2.1.2.1.1"><a href="#section-6.1.1" class="xref">6.1.1</a>. <a href="#name-packet-threshold" class="xref">Packet Threshold</a><a href="#section-toc.1-1.6.2.1.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.6.2.1.2.2">
<p id="section-toc.1-1.6.2.1.2.2.1"><a href="#section-6.1.2" class="xref">6.1.2</a>. <a href="#name-time-threshold" class="xref">Time Threshold</a><a href="#section-toc.1-1.6.2.1.2.2.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="toc compact ulEmpty" id="section-toc.1-1.6.2.2">
<p id="section-toc.1-1.6.2.2.1"><a href="#section-6.2" class="xref">6.2</a>. <a href="#name-probe-timeout" class="xref">Probe Timeout</a><a href="#section-toc.1-1.6.2.2.1" class="pilcrow">¶</a></p>
<ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.6.2.2.2.1">
<p id="section-toc.1-1.6.2.2.2.1.1"><a href="#section-6.2.1" class="xref">6.2.1</a>. <a href="#name-computing-pto" class="xref">Computing PTO</a><a href="#section-toc.1-1.6.2.2.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.6.2.2.2.2">
<p id="section-toc.1-1.6.2.2.2.2.1"><a href="#section-6.2.2" class="xref">6.2.2</a>. <a href="#name-handshakes-and-new-paths" class="xref">Handshakes and New Paths</a><a href="#section-toc.1-1.6.2.2.2.2.1" class="pilcrow">¶</a></p>
</li>