Transport parameters for 0-RTT connections
draft-kuhn-quic-0rtt-bdp-07

Document Type Active Internet-Draft (individual)
Authors Nicolas Kuhn  , Stephan Emile  , Gorry Fairhurst  , Tom Jones 
Last updated 2020-05-18
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Internet Engineering Task Force                                  N. Kuhn
Internet-Draft                                                      CNES
Intended status: Informational                                E. Stephan
Expires: November 19, 2020                                        Orange
                                                            G. Fairhurst
                                                                T. Jones
                                                  University of Aberdeen
                                                            May 18, 2020

               Transport parameters for 0-RTT connections
                      draft-kuhn-quic-0rtt-bdp-07

Abstract

   0-RTT mechanisms reduce the time it takes for the first bytes of
   application data to be processed in a transport connection and can
   greatly reduce connection latency during setup.  The 0-RTT transport
   features described by quic-transport help clients establish secure
   connections with a minimal number of round-trips.

   This document describes a generic method to exchange path parameters
   relating to transport.  The additional transport parameters can help
   a connection that continues after an interruption or restarts by
   sharing connection properties.  They can be used to increase the
   performance for a path with large RTT.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on November 19, 2020.

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Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  BDP metadata parameters . . . . . . . . . . . . . . . . . . .   4
   4.  Extension activation  . . . . . . . . . . . . . . . . . . . .   5
   5.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  Informative References  . . . . . . . . . . . . . . . . . . .   6
   Appendix A.  Example of server solution . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Each transport connection typically starts without knowledge of the
   path between the endpoints.  Transport protocols use implicit signals
   from the network to discover the properties of the path.  This
   information is used to adapt the transport mechanisms to the network
   path.  For example, an Internet transport endpoint is unable to
   determine a safe rate at which to start or continue their
   transmission, and uses slow-start to determine a safe rate.  This
   applies to the 1-RTT mode of QUIC.

   QUIC supports the sending of data in two different modes, after the
   transport handshake has completed, 1-RTT mode, and sending data along
   with handshake packets, 0-RTT mode.  Using 0-RTT data an application
   is able to send transport parameters with the handshake packets,
   making it possible to reduce the latency of the connection setup.

   In 0-RTT mode, a QUIC server must store a copy of a number of flow
   control related transport parameters, or receives an integrity-

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   protected copy of these values in the ticket the client includes in
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