draft-ietf-xrblock-rtcp-xr-jb-09.txt   draft-ietf-xrblock-rtcp-xr-jb-10.txt 
Audio/Video Transport Working Group A. Clark Audio/Video Transport Working Group A. Clark
Internet-Draft Telchemy Internet-Draft Telchemy
Intended status: Standards Track V. Singh Intended status: Standards Track V. Singh
Expires: September 17, 2013 Aalto University Expires: October 4, 2013 Aalto University
Q. Wu Q. Wu
Huawei Huawei
March 16, 2013 April 2, 2013
RTP Control Protocol (RTCP) Extended Report (XR) Block for Jitter Buffer RTP Control Protocol (RTCP) Extended Report (XR) Block for Jitter Buffer
Metric Reporting Metric Reporting
draft-ietf-xrblock-rtcp-xr-jb-09.txt draft-ietf-xrblock-rtcp-xr-jb-10.txt
Abstract Abstract
This document defines an RTP Control Protocol (RTCP) Extended Report This document defines an RTP Control Protocol (RTCP) Extended Report
(XR) Block that allows the reporting of Jitter Buffer metrics for a (XR) Block that allows the reporting of Jitter Buffer metrics for a
range of RTP applications. range of RTP applications.
Status of this Memo Status of this Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
skipping to change at page 1, line 36 skipping to change at page 1, line 36
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 17, 2013. This Internet-Draft will expire on October 4, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 2, line 38 skipping to change at page 2, line 38
6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 11 6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 11
6.3. Contact information for registrations . . . . . . . . . . 11 6.3. Contact information for registrations . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12 7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 13 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 13
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1. Normative References . . . . . . . . . . . . . . . . . . . 15 10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
10.2. Informative References . . . . . . . . . . . . . . . . . . 15 10.2. Informative References . . . . . . . . . . . . . . . . . . 15
Appendix A. Metrics represented using RFC6390 Template . . . . . 16 Appendix A. Metrics represented using RFC6390 Template . . . . . 16
Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 19 Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 19
B.1. draft-ietf-xrblock-rtcp-xr-jb-09 . . . . . . . . . . . . . 19 B.1. draft-ietf-xrblock-rtcp-xr-jb-10 . . . . . . . . . . . . . 19
B.2. draft-ietf-xrblock-rtcp-xr-jb-08 . . . . . . . . . . . . . 19 B.2. draft-ietf-xrblock-rtcp-xr-jb-09 . . . . . . . . . . . . . 19
B.3. draft-ietf-xrblock-rtcp-xr-jb-07 . . . . . . . . . . . . . 19 B.3. draft-ietf-xrblock-rtcp-xr-jb-08 . . . . . . . . . . . . . 19
B.4. draft-ietf-xrblock-rtcp-xr-jb-05 . . . . . . . . . . . . . 19 B.4. draft-ietf-xrblock-rtcp-xr-jb-07 . . . . . . . . . . . . . 19
B.5. draft-ietf-xrblock-rtcp-xr-jb-03 . . . . . . . . . . . . . 19 B.5. draft-ietf-xrblock-rtcp-xr-jb-05 . . . . . . . . . . . . . 19
B.6. draft-ietf-xrblock-rtcp-xr-jb-02 . . . . . . . . . . . . . 19 B.6. draft-ietf-xrblock-rtcp-xr-jb-03 . . . . . . . . . . . . . 19
B.7. draft-ietf-xrblock-rtcp-xr-jb-01 . . . . . . . . . . . . . 20 B.7. draft-ietf-xrblock-rtcp-xr-jb-02 . . . . . . . . . . . . . 20
B.8. draft-ietf-xrblock-rtcp-xr-jb-00 . . . . . . . . . . . . . 20 B.8. draft-ietf-xrblock-rtcp-xr-jb-01 . . . . . . . . . . . . . 20
B.9. draft-ietf-xrblock-rtcp-xr-jb-00 . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction 1. Introduction
1.1. Jitter Buffer Metrics Block 1.1. Jitter Buffer Metrics Block
This document defines a new block type to augment those defined in This document defines a new block type to augment those defined in
[RFC3611], for use in a range of RTP applications. [RFC3611], for use in a range of RTP applications.
The new block type provides information on jitter buffer The new block type provides information on jitter buffer
skipping to change at page 5, line 24 skipping to change at page 5, line 24
playout time. playout time.
Overall user perceived delay = network round trip delay + local Overall user perceived delay = network round trip delay + local
(jitter buffer (nominal) delay + encoder serialization delay) + (jitter buffer (nominal) delay + encoder serialization delay) +
remote (jitter buffer (nominal) delay + encoder serialization delay) remote (jitter buffer (nominal) delay + encoder serialization delay)
The jitter buffer can be considered as a time window with early edge The jitter buffer can be considered as a time window with early edge
aligned with the delay corresponding to the earliest arriving packet aligned with the delay corresponding to the earliest arriving packet
and late edge representing the maximum permissible delay before a and late edge representing the maximum permissible delay before a
late arriving packet would be discarded. The delay applied to late arriving packet would be discarded. The delay applied to
packets that arrive at their expected time is known as the Nominal packets that arrive on time or at their expected arrival time is
Delay and this is equivalent to the late edge. known as the Nominal Delay and this is equivalent to the time
difference/ buffer size difference between the on-time packets
insertion point and the point at which packets are read out.
The reference for the expected arrival time may, for example, be the The reference for the expected arrival time may, for example, be the
first packet in the session or the running average delay. If all first packet in the session or the running average delay. If all
packets arrived at their expected arrival time then then every packet packets arrived at their expected arrival time then then every packet
would be held in the jitter buffer exactly the Nominal Delay. would be held in the jitter buffer exactly the Nominal Delay.
The Jitter Buffer maximum delay is the delay that is applied to an The Jitter Buffer maximum delay is the delay that is applied to an
earliest arriving packet that is not discarded and corresponds to the earliest arriving packet that is not discarded and corresponds to the
early edge of the jitter buffer time window. early edge of the jitter buffer time window.
skipping to change at page 6, line 21 skipping to change at page 6, line 24
(v). Go back to (ii) (v). Go back to (ii)
Note that this idealized implementation assumes that the sender's RTP Note that this idealized implementation assumes that the sender's RTP
clock is synchronized to the clock in the receiver which is used to clock is synchronized to the clock in the receiver which is used to
timestamp packet arrivals. If there is no such inherent timestamp packet arrivals. If there is no such inherent
synchronization, the system may need to use an adaptive jitter buffer synchronization, the system may need to use an adaptive jitter buffer
or other techniques to ensure reliable reception. or other techniques to ensure reliable reception.
3.2. Fixed Jitter Buffer 3.2. Fixed Jitter Buffer
The fixed jitter buffers have a fixed size and the packets leaving A fixed jitter buffer lacks provision to track network condition and
the jitter buffer have a constant delay. has a fixed size and packets leaving the jitter buffer have a
constant delay. For fixed jitter buffer implementation, the nominal
delay is set to a constant value corresponding to the packets that
arrive at their expected arrival time while the maximum delay is set
to a constant value corresponding to the fixed size of the jitter
buffer.
3.3. Adaptive Jitter Buffer 3.3. Adaptive Jitter Buffer
An adaptive jitter buffer have variable size and variable delay. It An adaptive jitter buffer can adapt to the change in the network's
allows the nominal delay to be set to a low value initially, to delay and has variable size or variable delay. It allows the nominal
minimize user perceived delay, however can automatically extend the delay to be set to a low value initially, to minimize user perceived
late edge (and possibly also retract the early edge) of buffer window delay, however can automatically extend the late edge (and possibly
if a significant proportion of packets are arriving late (and hence also retract the early edge) of buffer window if a significant
being discarded). proportion of packets are arriving late (and hence being discarded).
4. Jitter Buffer Metrics Block 4. Jitter Buffer Metrics Block
This block describes the configuration and operating parameters of This block describes the configuration and operating parameters of
the jitter buffer in the receiver of the RTP end system or RTP mixer the jitter buffer in the receiver of the RTP end system or RTP mixer
which sends the report. Instances of this Metrics Block refer by which sends the report. Instances of this Metrics Block refer by
SSRC to the separate auxiliary Measurement Information block SSRC to the separate auxiliary Measurement Information block
[RFC6776] which describes the measurement interval in use. This [RFC6776] which describes the measurement interval in use. This
Metrics Block relies on the measurement interval in the Measurement Metrics Block relies on the measurement interval in the Measurement
Information block indicating the span of the report and should be Information block indicating the span of the report and should be
skipping to change at page 16, line 7 skipping to change at page 16, line 7
10.2. Informative References 10.2. Informative References
[RFC6390] Clark, A. and B. Claise, "Framework for Performance Metric [RFC6390] Clark, A. and B. Claise, "Framework for Performance Metric
Development", RFC 6390, October 2011. Development", RFC 6390, October 2011.
[RFC6792] Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures [RFC6792] Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures
for RTP", RFC 6792, November 2012. for RTP", RFC 6792, November 2012.
Appendix A. Metrics represented using RFC6390 Template Appendix A. Metrics represented using RFC6390 Template
RFC EDITOR NOTE: please change XXXX in [RFCXXXX] by the new RFC
number, when assigned.
a. jitter buffer nominal delay Metric a. jitter buffer nominal delay Metric
* Metric Name: jitter buffer nominal delay * Metric Name: jitter buffer nominal delay
* Metric Description: The "expected arrival time" is the time * Metric Description: The "expected arrival time" is the time
that a RTP packet would arrive if there was no delay that a RTP packet would arrive if there was no delay
variation. The delay applied to packets that arrive at their variation. The delay applied to packets that arrive at their
expected time is known as the Nominal Delay. expected time is known as the Nominal Delay.
* Method of Measurement or Calculation: See section 4.2, jitter * Method of Measurement or Calculation: See section 4.2, jitter
buffer nominal delay definition for measurement or calculation buffer nominal delay definition [RFCXXXX].
method.
* Units of Measurement: See section 4.2, jitter buffer nominal * Units of Measurement: See section 4.2, jitter buffer nominal
delay definition for units of measurement. delay definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 4, 1st paragraph for measurement point. section 4, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph for * Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 paragraph for Interval measurement timing and section 4.2 paragraph [RFCXXXX] for
Metric flag. Interval Metric flag.
* Use and applications: See section 1.4 for use and * Use and applications: See section 1.4 [RFCXXXX].
applications.
* Reporting model: See RFC3611 for reporting model. * Reporting model: See RFC3611.
b. jitter buffer maximum delay Metric b. jitter buffer maximum delay Metric
* Metric Name: jitter buffer maximum delay * Metric Name: jitter buffer maximum delay
* Metric Description: It is the current maximum jitter buffer * Metric Description: It is the current maximum jitter buffer
delay for RTP traffic which corresponds to the earliest delay for RTP traffic which corresponds to the earliest
arriving packet that would not be discarded. arriving packet that would not be discarded.
* Method of Measurement or Calculation: See section 4.2, jitter * Method of Measurement or Calculation: See section 4.2, jitter
buffer maximum delay definition and section 3, the last buffer maximum delay definition and section 3, the last
paragraph for measurement or calculation method. paragraph [RFCXXXX].
* Units of Measurement: See section 4.2, jitter buffer maximum * Units of Measurement: See section 4.2, jitter buffer maximum
delay definition for units of measurement. delay definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 4, 1st paragraph for measurement point. section 4, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph for * Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 paragraph for Interval measurement timing and section 4.2 paragraph [RFCXXXX] for
Metric flag. Interval Metric flag.
* Use and applications: See section 1.4 for use and * Use and applications: See section 1.4 [RFCXXXX].
applications.
* Reporting model: See RFC3611 for reporting model. * Reporting model: See RFC3611.
c. jitter buffer high water mark Metric c. jitter buffer high water mark Metric
* Metric Name: jitter buffer high water mark * Metric Name: jitter buffer high water mark
* Metric Description: It is the highest value of the jitter * Metric Description: It is the highest value of the jitter
buffer nominal delay for RTP traffic which occurred at any buffer nominal delay for RTP traffic which occurred at any
time during the reporting interval. time during the reporting interval.
* Method of Measurement or Calculation: See section 4.2, jitter * Method of Measurement or Calculation: See section 4.2, jitter
buffer high water mark definition for measurement or buffer high water mark definition [RFCXXXX].
calculation method.
* Units of Measurement: See section 4.2, jitter buffer nominal * Units of Measurement: See section 4.2, jitter buffer nominal
delay definition for units of measurement. delay definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 4, 1st paragraph for measurement point. section 4, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph for * Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 paragraph for Interval measurement timing and section 4.2 paragraph [RFCXXXX] for
Metric flag. Interval Metric flag.
* Use and applications: See section 1.4 for use and * Use and applications: See section 1.4 [RFCXXXX].
applications.
* Reporting model: See RFC3611 for reporting model. * Reporting model: See RFC3611.
d. jitter buffer low water mark Metric d. jitter buffer low water mark Metric
* Metric Name: jitter buffer low water mark * Metric Name: jitter buffer low water mark
* Metric Description: It is the lowest value of the jitter * Metric Description: It is the lowest value of the jitter
buffer nominal delay for RTP traffic which occurred at any buffer nominal delay for RTP traffic which occurred at any
time during the reporting interval. time during the reporting interval.
* Method of Measurement or Calculation: See section 4.2, jitter * Method of Measurement or Calculation: See section 4.2, jitter
buffer low water mark definition for measurement or buffer low water mark definition [RFCXXXX].
calculation method.
* Units of Measurement: See section 4.2, jitter buffer low water * Units of Measurement: See section 4.2, jitter buffer low water
mark definition for units of measurement. mark definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 4, 1st paragraph for measurement point. section 4, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph for * Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 paragraph for Interval measurement timing and section 4.2 paragraph [RFCXXXX] for
Metric flag. Interval Metric flag.
* Use and applications: See section 1.4 for use and * Use and applications: See section 1.4 [RFCXXXX].
applications.
* Reporting model: See RFC3611 for reporting model. * Reporting model: See RFC3611.
Appendix B. Change Log Appendix B. Change Log
Note to the RFC-Editor: please remove this section prior to Note to the RFC-Editor: please remove this section prior to
publication as an RFC. publication as an RFC.
B.1. draft-ietf-xrblock-rtcp-xr-jb-09 B.1. draft-ietf-xrblock-rtcp-xr-jb-10
The following are the major changes to previous version :
o Add some text to section 3.2 to clarify how fixed jitter buffer is
used.
o Other Editorial changes.
B.2. draft-ietf-xrblock-rtcp-xr-jb-09
The following are the major changes to previous version : The following are the major changes to previous version :
o Incorporate proposed changes by Kevin and proposed text by Alan to o Incorporate proposed changes by Kevin and proposed text by Alan to
address interoperability report issue. address interoperability report issue.
o Add new appendix to format metrics using RFC6390 template. o Add new appendix to format metrics using RFC6390 template.
B.2. draft-ietf-xrblock-rtcp-xr-jb-08 B.3. draft-ietf-xrblock-rtcp-xr-jb-08
The following are the major changes to previous version : The following are the major changes to previous version :
o Rewrote descriptive text and definitions for clarification. o Rewrote descriptive text and definitions for clarification.
B.3. draft-ietf-xrblock-rtcp-xr-jb-07 B.4. draft-ietf-xrblock-rtcp-xr-jb-07
The following are the major changes to previous version : The following are the major changes to previous version :
o Add one new section to discuss jitter buffer operation. o Add one new section to discuss jitter buffer operation.
B.4. draft-ietf-xrblock-rtcp-xr-jb-05 B.5. draft-ietf-xrblock-rtcp-xr-jb-05
The following are the major changes to previous version : The following are the major changes to previous version :
o Some editorial change changes based on the discussion with Glen o Some editorial change changes based on the discussion with Glen
and Kevin on the list. and Kevin on the list.
B.5. draft-ietf-xrblock-rtcp-xr-jb-03 B.6. draft-ietf-xrblock-rtcp-xr-jb-03
The following are the major changes to previous version : The following are the major changes to previous version :
o Reduce the "jb cfg" to 1-bit based on discussion in the WGLC. o Reduce the "jb cfg" to 1-bit based on discussion in the WGLC.
o Other editorial change changes aligning with PDV,Delay draft. o Other editorial change changes aligning with PDV,Delay draft.
B.6. draft-ietf-xrblock-rtcp-xr-jb-02 B.7. draft-ietf-xrblock-rtcp-xr-jb-02
The following are the major changes to previous version : The following are the major changes to previous version :
o Add some explanation text in the SDP offer/answer section. o Add some explanation text in the SDP offer/answer section.
o Add some text in applicability section to explain the use to o Add some text in applicability section to explain the use to
report jitter buffer metrics. report jitter buffer metrics.
o Other editorial change changes aligning with PDV,Delay draft. o Other editorial change changes aligning with PDV,Delay draft.
B.7. draft-ietf-xrblock-rtcp-xr-jb-01 B.8. draft-ietf-xrblock-rtcp-xr-jb-01
The following are the major changes to previous version : The following are the major changes to previous version :
o Outdated reference update o Outdated reference update
o Add one Editor notes to ask clarification on the use of reporting o Add one Editor notes to ask clarification on the use of reporting
jitter buffer metrics. jitter buffer metrics.
o Other Editorial changes. o Other Editorial changes.
B.8. draft-ietf-xrblock-rtcp-xr-jb-00 B.9. draft-ietf-xrblock-rtcp-xr-jb-00
The following are the major changes to previous version : The following are the major changes to previous version :
o Boilerplate updates. o Boilerplate updates.
o references updates o references updates
o allocate 32 bit field in report block for SSRC o allocate 32 bit field in report block for SSRC
o Other editorial changes to get alignment with MONARCH draft. o Other editorial changes to get alignment with MONARCH draft.
 End of changes. 41 change blocks. 
69 lines changed or deleted 82 lines changed or added

This html diff was produced by rfcdiff 1.41. The latest version is available from http://tools.ietf.org/tools/rfcdiff/