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draft-ietf-quic-recovery.html
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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 16 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="2021-01-12" class="published">12 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="2021-07-16">16 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 16 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="ulEmpty toc compact">
<li class="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact">
<li class="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact">
<li class="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact" 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="ulEmpty toc compact">
<li class="ulEmpty toc compact" 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="ulEmpty toc compact" 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>