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draft-ietf-quic-recovery.html
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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">June 2020</td>
</tr></thead>
<tfoot><tr>
<td class="left">Iyengar & Swett</td>
<td class="center">Expires 5 December 2020</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-latest</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2020-06-03" class="published">3 June 2020</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="2020-12-05">5 December 2020</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 5 December 2020.<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) 2020 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"><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>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1">
<p id="section-toc.1-1.3.2.1.1"><a href="#section-3.1" class="xref">3.1</a>. <a href="#name-relevant-differences-betwee" class="xref">Relevant Differences Between QUIC and TCP</a><a href="#section-toc.1-1.3.2.1.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.1">
<p id="section-toc.1-1.3.2.1.2.1.1" class="keepWithNext"><a href="#section-3.1.1" class="xref">3.1.1</a>. <a href="#name-separate-packet-number-spac" class="xref">Separate Packet Number Spaces</a><a href="#section-toc.1-1.3.2.1.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.2">
<p id="section-toc.1-1.3.2.1.2.2.1"><a href="#section-3.1.2" class="xref">3.1.2</a>. <a href="#name-monotonically-increasing-pa" class="xref">Monotonically Increasing Packet Numbers</a><a href="#section-toc.1-1.3.2.1.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.3">
<p id="section-toc.1-1.3.2.1.2.3.1"><a href="#section-3.1.3" class="xref">3.1.3</a>. <a href="#name-clearer-loss-epoch" class="xref">Clearer Loss Epoch</a><a href="#section-toc.1-1.3.2.1.2.3.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.4">
<p id="section-toc.1-1.3.2.1.2.4.1"><a href="#section-3.1.4" class="xref">3.1.4</a>. <a href="#name-no-reneging" class="xref">No Reneging</a><a href="#section-toc.1-1.3.2.1.2.4.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.5">
<p id="section-toc.1-1.3.2.1.2.5.1"><a href="#section-3.1.5" class="xref">3.1.5</a>. <a href="#name-more-ack-ranges" class="xref">More ACK Ranges</a><a href="#section-toc.1-1.3.2.1.2.5.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.6">
<p id="section-toc.1-1.3.2.1.2.6.1"><a href="#section-3.1.6" class="xref">3.1.6</a>. <a href="#name-explicit-correction-for-del" class="xref">Explicit Correction For Delayed Acknowledgements</a><a href="#section-toc.1-1.3.2.1.2.6.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.7">
<p id="section-toc.1-1.3.2.1.2.7.1"><a href="#section-3.1.7" class="xref">3.1.7</a>. <a href="#name-probe-timeout-replaces-rto-" class="xref">Probe Timeout Replaces RTO and TLP</a><a href="#section-toc.1-1.3.2.1.2.7.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.3.2.1.2.8">
<p id="section-toc.1-1.3.2.1.2.8.1"><a href="#section-3.1.8" class="xref">3.1.8</a>. <a href="#name-the-minimum-congestion-wind" class="xref">The Minimum Congestion Window is Two Packets</a><a href="#section-toc.1-1.3.2.1.2.8.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
</ul>
</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-estimating-the-round-trip-t" class="xref">Estimating the Round-Trip Time</a><a href="#section-toc.1-1.4.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc 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-generating-rtt-samples" class="xref">Generating RTT samples</a><a href="#section-toc.1-1.4.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc 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-estimating-min_rtt" class="xref">Estimating min_rtt</a><a href="#section-toc.1-1.4.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc 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-estimating-smoothed_rtt-and" class="xref">Estimating smoothed_rtt and rttvar</a><a href="#section-toc.1-1.4.2.3.1" 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-loss-detection" class="xref">Loss Detection</a><a href="#section-toc.1-1.5.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc 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-acknowledgement-based-detec" class="xref">Acknowledgement-based Detection</a><a href="#section-toc.1-1.5.2.1.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.1.2.1">
<p id="section-toc.1-1.5.2.1.2.1.1"><a href="#section-5.1.1" class="xref">5.1.1</a>. <a href="#name-packet-threshold" class="xref">Packet Threshold</a><a href="#section-toc.1-1.5.2.1.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.1.2.2">
<p id="section-toc.1-1.5.2.1.2.2.1"><a href="#section-5.1.2" class="xref">5.1.2</a>. <a href="#name-time-threshold" class="xref">Time Threshold</a><a href="#section-toc.1-1.5.2.1.2.2.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="compact toc 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-probe-timeout" class="xref">Probe Timeout</a><a href="#section-toc.1-1.5.2.2.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.2.2.1">
<p id="section-toc.1-1.5.2.2.2.1.1"><a href="#section-5.2.1" class="xref">5.2.1</a>. <a href="#name-computing-pto" class="xref">Computing PTO</a><a href="#section-toc.1-1.5.2.2.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.2.2.2">
<p id="section-toc.1-1.5.2.2.2.2.1"><a href="#section-5.2.2" class="xref">5.2.2</a>. <a href="#name-handshakes-and-new-paths" class="xref">Handshakes and New Paths</a><a href="#section-toc.1-1.5.2.2.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.2.2.3">
<p id="section-toc.1-1.5.2.2.2.3.1"><a href="#section-5.2.3" class="xref">5.2.3</a>. <a href="#name-speeding-up-handshake-compl" class="xref">Speeding Up Handshake Completion</a><a href="#section-toc.1-1.5.2.2.2.3.1" class="pilcrow">¶</a></p>
</li>
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.2.2.4">
<p id="section-toc.1-1.5.2.2.2.4.1"><a href="#section-5.2.4" class="xref">5.2.4</a>. <a href="#name-sending-probe-packets" class="xref">Sending Probe Packets</a><a href="#section-toc.1-1.5.2.2.2.4.1" class="pilcrow">¶</a></p>
</li>