Adding Explicit Passive Measurability of Two-Way Latency to the QUIC Transport Protocol
draft-trammell-quic-spin-03

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QUIC                                                    B. Trammell, Ed.
Internet-Draft                                               P. De Vaere
Intended status: Informational                                ETH Zurich
Expires: November 15, 2018                                       R. Even
                                                                  Huawei
                                                             G. Fioccola
                                                          Telecom Italia
                                                              T. Fossati
                                                                   Nokia
                                                                M. Ihlar
                                                                Ericsson
                                                               A. Morton
                                                               AT&T Labs
                                                              E. Stephan
                                                                  Orange
                                                            May 14, 2018

  Adding Explicit Passive Measurability of Two-Way Latency to the QUIC
                           Transport Protocol
                      draft-trammell-quic-spin-03

Abstract

   This document describes the addition of a "spin bit", intended for
   explicit measurability of end-to-end RTT, to the QUIC transport
   protocol.  It proposes a detailed mechanism for the spin bit, as well
   as an additional mechanism, called the valid edge counter, to
   increase the fidelity of the latency signal in less than ideal
   network conditions.  It describes how to use the latency spin signal
   to measure end-to-end latency, discusses corner cases and their
   workarounds in the measurement, describes experimental evaluation of
   the mechanism done to date, and examines the utility and privacy
   implications of the spin bit.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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Trammell, et al.        Expires November 15, 2018               [Page 1]
Internet-Draft                  Spin Bits                       May 2018

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 15, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  About This Document . . . . . . . . . . . . . . . . . . .   4
   2.  The Spin Bit Mechanism  . . . . . . . . . . . . . . . . . . .   4
   3.  Using the Spin Bit for Passive RTT Measurement  . . . . . . .   5
     3.1.  Limitations and Workarounds . . . . . . . . . . . . . . .   5
     3.2.  Illustration  . . . . . . . . . . . . . . . . . . . . . .   6
   4.  The Valid Edge Counter  . . . . . . . . . . . . . . . . . . .   8
     4.1.  Proposed Short Header Format Including Spin Bit and VEC .   8
     4.2.  Setting the Valid Edge Counter (VEC)  . . . . . . . . . .   9
     4.3.  Use of the VEC by a passive observer  . . . . . . . . . .  10
   5.  Privacy and Security Considerations . . . . . . . . . . . . .  10
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Experimental Evaluation  . . . . . . . . . . . . . .  15
   Appendix B.  Use Cases for Passive RTT Measurement  . . . . . . .  16
     B.1.  Inter-domain Troubleshooting  . . . . . . . . . . . . . .  17
     B.2.  Two-Point Intradomain Measurement . . . . . . . . . . . .  18
     B.3.  Bufferbloat Mitigation in Cellular Networks . . . . . . .  19
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