Application Oriented High Precision Delay and Jitter Measurement
draft-yang-ippm-ptp-measurement-00

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IP Performance Measurement                                       H. Yang
Internet-Draft                                                    T. Sun
Intended status: Informational                                    K. Yao
Expires: January 13, 2021                                   China Mobile
                                                           July 12, 2020

    Application Oriented High Precision Delay and Jitter Measurement
                   draft-yang-ippm-ptp-measurement-00

Abstract

   As 5G has arisen and it is still evolving, there become many more
   time sensitive services which require high precision of measurements.
   In addition, in order to better simulate the transmission of packets
   of actual services, the length and priorities of the measurement
   packets SHOULD be customized, especially for some network that is
   inclined to get congested.  This document introduces a new way to
   measure the time delay and jitter between two devices by making
   adjustments based on PTP Sync message and Delay_Req message, which
   could, to a great extent, get close to the messages of actual
   services as well as achieve high precison of measured metrics, so as
   to meet all requirements mentioned above.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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Yang, et al.            Expires January 13, 2021                [Page 1]
Internet-Draft            Network Working Group                July 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Adjustments on PTP Sync Message and Delay_Req Message . . . .   3
     3.1.  Adjustments on PTP Header . . . . . . . . . . . . . . . .   3
     3.2.  Customization of Length and Priority  . . . . . . . . . .   4
       3.2.1.  Length  . . . . . . . . . . . . . . . . . . . . . . .   4
       3.2.2.  Priority  . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Measurement Procedures  . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The precision of some conventional ways used to measure the one-way
   or round-trip delay and jitter, including ICMP (ping command) and
   Iperf, a measurement tool, is highly dependent on
   NTP[RFC5905]precision which is between millisecond and second.  As 5G
   has arisen and it is still continuously evolving, many industrial
   scenarios, such as internet of vehicles, and other time sensitive
   sevices have new requirements for time precision which is in
   microsecond and even in nanosecond.  With the growing support of
   Precision Time Protocol (PTP) [IEEE.1588.2008], in many industrial
   scenarios, such as industrial control network and video transmission
   network, devices can be synchronized in very high precision that is
   in sub-microsecond.

   Although TWAMP has already supported PTP timestamp, as is stated
   in[RFC8186] , the current protocol doesn't allow customizing the
   length and priorities of packets.  Since packets of actual services
   have different length and priorities, which MAY lead to different
   time delay, the measurement packets need to be designed to meet such
   requirements.  This document introduces a new way to measure the time
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