draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06.txt   draft-ietf-xrblock-rtcp-xr-burst-gap-discard-07.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 R. Huang Intended status: Standards Track R. Huang
Expires: April 14, 2013 Q. Wu, Ed. Expires: June 3, 2013 Q. Wu, Ed.
Huawei Huawei
October 11, 2012 November 30, 2012
RTP Control Protocol(RTCP) Extended Report (XR) Block for Discard Count RTP Control Protocol(RTCP) Extended Report (XR) Block for Burst/Gap
metric Reporting Discard metric Reporting
draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06.txt draft-ietf-xrblock-rtcp-xr-burst-gap-discard-07.txt
Abstract Abstract
This document defines an RTCP XR Report Block that allows the This document defines an RTP Control Protocol(RTCP) Extended Report
reporting of Burst and Gap Discard metrics for use in a range of RTP (XR) Block that allows the reporting of Burst and Gap Discard metrics
applications. for use in a 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
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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
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Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
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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 April 14, 2013. This Internet-Draft will expire on June 3, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the Copyright (c) 2012 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
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include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Burst and Gap Discard Report Block . . . . . . . . . . . . 3 1.1. Burst and Gap Discard Report Block . . . . . . . . . . . . 3
1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3 1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3
1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3 1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3
1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 3 1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 4 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5
3. Burst/Gap Discard Block . . . . . . . . . . . . . . . . . . . 5 3. Burst/Gap Discard Block . . . . . . . . . . . . . . . . . . . 6
3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 5 3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 6
3.2. Definition of Fields in Burst/Gap Discard Report Block . . 5 3.2. Definition of Fields in Burst/Gap Discard Report Block . . 6
3.3. Derived metrics based on reported metrics . . . . . . . . 7 3.3. Derived metrics based on reported metrics . . . . . . . . 8
4. Considerations for Voice-over-IP applications . . . . . . . . 8 4. Considerations for Voice-over-IP applications . . . . . . . . 9
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 9 5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 9 5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 10
5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 9 5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 10 6.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 11
6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 10 6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 11
6.3. Contact information for registrations . . . . . . . . . . 10 6.3. Contact information for registrations . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11 7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 12 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 13
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 13 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1. Normative References . . . . . . . . . . . . . . . . . . . 14 10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
10.2. Informative References . . . . . . . . . . . . . . . . . . 14 10.2. Informative References . . . . . . . . . . . . . . . . . . 15
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 15 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 16
A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 . . . . . 15 A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-07 . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16 A.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction 1. Introduction
1.1. Burst and Gap Discard Report Block 1.1. Burst and Gap Discard Report 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. The new block type [RFC3611] for use in a range of RTP applications. The new block type
supports the reporting of the proportion of packets discarded by the supports the reporting of the proportion of packets discarded by the
receiver due to jitter. The discards during discard bursts are receiver due to jitter. The discards during discard bursts are
reported, together with the number of bursts. This block is intended reported, together with the number of bursts. This block is intended
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However the metric in [DISCARD] may be used independently of the However the metric in [DISCARD] may be used independently of the
metrics in this block. metrics in this block.
This block provides information on transient IP problems. Burst/Gap This block provides information on transient IP problems. Burst/Gap
metrics are typically used in Cumulative reports however MAY be used metrics are typically used in Cumulative reports however MAY be used
in Interval reports. The burstiness of packet discard affects user in Interval reports. The burstiness of packet discard affects user
experience, may influence any sender strategies to mitigate the experience, may influence any sender strategies to mitigate the
problem, and may also have diagnostic value. problem, and may also have diagnostic value.
The metric belongs to the class of transport-related end system The metric belongs to the class of transport-related end system
metrics defined in [MONARCH]. metrics defined in [RFC6792].
The definitions of Burst, Gap, Loss and Discard are consistent with The definitions of Burst, Gap, Loss and Discard are consistent with
definitions in [RFC3611]. To accommodate the range of jitter buffer definitions in [RFC3611]. To accommodate the range of jitter buffer
algorithms and packet discard logic that may be used by implementors, algorithms and packet discard logic that may be used by implementors,
the method used to distinguish between bursts and gaps may be an the method used to distinguish between bursts and gaps may be an
equivalent method to that defined in[RFC3611]. equivalent method to that defined in[RFC3611].
1.2. RTCP and RTCP XR Reports 1.2. RTCP and RTCP XR Reports
The use of RTCP for reporting is defined in [RFC3550]. [RFC3611] The use of RTCP for reporting is defined in [RFC3550]. [RFC3611]
defined an extensible structure for reporting using an RTCP Extended defined an extensible structure for reporting using an RTCP Extended
Report (XR). This document defines a new Extended Report block for Report (XR). This document defines a new Extended Report block for
use with [RFC3550] and [RFC3611]. use with [RFC3550] and [RFC3611].
1.3. Performance Metrics Framework 1.3. Performance Metrics Framework
The Performance Metrics Framework [RFC6390] provides guidance on the The Performance Metrics Framework [RFC6390] provides guidance on the
definition and specification of performance metrics. Metrics definition and specification of performance metrics. The RTP
described in this draft either reference external definitions or Monitoring Architectures [RFC6792] provides guideline for reporting
define metrics generally in accordance with the guidelines in block format using RTCP XR. The Metrics Block described in this
[RFC6390]. document are in accordance with the guidelines in [RFC6390] and
[RFC6792].
1.4. Applicability 1.4. Applicability
These metrics are applicable to a range of RTP applications which These metrics are applicable to a range of RTP applications which
don't use stream repair means. don't use stream repair means.
2. Terminology 2. Terminology
2.1. Standards Language 2.1. Standards Language
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A Burst/Gap Discard Report Block is identified by the constant A Burst/Gap Discard Report Block is identified by the constant
NBGD. NBGD.
[Note to RFC Editor: please replace NBGD with the IANA provided [Note to RFC Editor: please replace NBGD with the IANA provided
RTCP XR block type for this block.] RTCP XR block type for this block.]
Interval Metric flag (I): 2 bits Interval Metric flag (I): 2 bits
This field is used to indicate whether the Burst/Gap Discard This field is used to indicate whether the Burst/Gap Discard
metrics are Sampled, Interval or Cumulative metrics, that is, metrics are Sampled, Interval or Cumulative metrics:
whether the reported values applies to the most recent measurement
interval duration between successive metrics reports (I=10) (the I=10: Interval Duration - the reported value applies to the
Interval Duration) or to the accumulation period characteristic of most recent measurement interval duration between successive
cumulative measurements (I=11) (the Cumulative Duration) or is a metrics reports.
sampled instantaneous value (I=01) (Sampled Value). In this
document, Burst/Gap Discard Metric is not measured at a particular I=11: Cumulative Duration - the reported value applies to the
time instant but over one or several reporting intervals. accumulation period characteristic of cumulative measurements.
Therefore Burst/Gap Discard Metric MUST NOT be chosen as Sampled
Metric. I=01: Sampled Value - the reported value is a sampled
instantaneous value.
In this document, Burst/Gap Discard Metric is not measured at a
particular time instant but over one or several reporting
intervals. Therefore Burst/Gap Discard Metric MUST NOT be chosen
as Sampled Metric.
Reserved (resv): 6 bits Reserved (resv): 6 bits
These bits are reserved. They SHOULD be set to zero by senders These bits are reserved. They SHOULD be set to zero by senders
and MUST be ignored by receivers. and MUST be ignored by receivers.
block length: 16 bits block length: 16 bits
The length of this report block in 32-bit words, minus one. For The length of this report block in 32-bit words, minus one. For
the Burst/Gap discard block, the block length is equal to 3. the Burst/Gap discard block, the block length is equal to 3.
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measurement is unavailable, the value 0xFFFFFF SHOULD be reported. measurement is unavailable, the value 0xFFFFFF SHOULD be reported.
Reserved (resv): 8 bits Reserved (resv): 8 bits
These bits are reserved. They SHOULD be set to zero by senders These bits are reserved. They SHOULD be set to zero by senders
and MUST be ignored by receivers. and MUST be ignored by receivers.
3.3. Derived metrics based on reported metrics 3.3. Derived metrics based on reported metrics
The metrics described here are intended to be used in conjunction The metrics described here are intended to be used in conjunction
with information from the Measurement Information block [MEASID], with information from the Measurement Information block [RFC6776],
discard block [DISCARD] (which MUST be present in the same RTCP discard block [DISCARD] (which MUST be present in the same RTCP
packet as the Burst/Gap Discard block). packet as the Burst/Gap Discard block).
These metrics provides the following information relevant to These metrics provides the following information relevant to
statistical parameters, including: statistical parameters, including:
o The fraction of packets discarded during bursts (burst discard o The fraction of packets discarded during bursts (burst discard
rate in [SUMSTAT]) rate in [SUMSTAT])
o The fraction of packets discarded during gaps (gap discard rate in o The fraction of packets discarded during gaps (gap discard rate in
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in [RFC3611] by providing an additional value of "xr-format" to in [RFC3611] by providing an additional value of "xr-format" to
signal the use of the report block defined in this document. signal the use of the report block defined in this document.
xr-format =/ xr-bgd-block xr-format =/ xr-bgd-block
xr-bgd-block = "brst-gap-dscrd" xr-bgd-block = "brst-gap-dscrd"
5.2. Offer/Answer Usage 5.2. Offer/Answer Usage
When SDP is used in offer-answer context, the SDP Offer/Answer usage When SDP is used in offer-answer context, the SDP Offer/Answer usage
defined in [RFC3611] applies. defined in [RFC3611] for unilateral "rtcp-xr" attribute parameters
applies. For detailed usage in Offer/Answer for unilateral
parameter, refer to section 5.2 of [RFC3611].
6. IANA Considerations 6. IANA Considerations
New block types for RTCP XR are subject to IANA registration. For New block types for RTCP XR are subject to IANA registration. For
general guidelines on IANA considerations for RTCP XR, refer to general guidelines on IANA considerations for RTCP XR, refer to
[RFC3611]. [RFC3611].
6.1. New RTCP XR Block Type value 6.1. New RTCP XR Block Type value
This document assigns the block type value NBGD in the IANA "RTCP XR This document assigns the block type value NBGD in the IANA "RTCP XR
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Geoff Hunt wrote the initial draft of this document. Geoff Hunt wrote the initial draft of this document.
9. Acknowledgments 9. Acknowledgments
The authors gratefully acknowledge reviews and feedback provided by The authors gratefully acknowledge reviews and feedback provided by
Bruce Adams, Philip Arden, Amit Arora, Bob Biskner, Kevin Connor, Bruce Adams, Philip Arden, Amit Arora, Bob Biskner, Kevin Connor,
Claus Dahm, Randy Ethier, Roni Even, Jim Frauenthal, Albert Higashi, Claus Dahm, Randy Ethier, Roni Even, Jim Frauenthal, Albert Higashi,
Tom Hock, Shane Holthaus, Paul Jones, Rajesh Kumar, Keith Lantz, Tom Hock, Shane Holthaus, Paul Jones, Rajesh Kumar, Keith Lantz,
Mohamed Mostafa, Amy Pendleton, Colin Perkins, Mike Ramalho, Ravi Mohamed Mostafa, Amy Pendleton, Colin Perkins, Mike Ramalho, Ravi
Raviraj, Albrecht Schwarz, Tom Taylor, and Hideaki Yamada. Raviraj, Albrecht Schwarz, Tom Taylor, and Hideaki Yamada, Paul
Kyzivat.
10. References 10. References
10.1. Normative References 10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", March 1997. Requirement Levels", March 1997.
[RFC3550] Schulzrinne, H., "RTP: A Transport Protocol for Real-Time [RFC3550] Schulzrinne, H., "RTP: A Transport Protocol for Real-Time
Applications", RFC 3550, July 2003. Applications", RFC 3550, July 2003.
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[RFC5725] Begen, A., Hsu, D., and M. Lague, "Post-Repair Loss RLE [RFC5725] Begen, A., Hsu, D., and M. Lague, "Post-Repair Loss RLE
Report Block Type for RTP Control Protocol (RTCP) Extended Report Block Type for RTP Control Protocol (RTCP) Extended
Reports (XRs)", RFC 5725, February 2020. Reports (XRs)", RFC 5725, February 2020.
10.2. Informative References 10.2. Informative References
[DISCARD] Hunt, G., "RTCP XR Report Block for Discard Count metric [DISCARD] Hunt, G., "RTCP XR Report Block for Discard Count metric
Reporting", ID draft-ietf-xrblock-rtcp-xr-discard-06, Reporting", ID draft-ietf-xrblock-rtcp-xr-discard-06,
October 2012. October 2012.
[MEASID] Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block",
ID draft-ietf-xrblock-rtcp-xr-meas-identity-10,
August 2012.
[MONARCH] Hunt, G., "Monitoring Architectures for RTP",
ID draft-ietf-avtcore-monarch-22, September 2012.
[PSES] "URL", http://www.its.bldrdoc.gov/projects/devglossary/ [PSES] "URL", http://www.its.bldrdoc.gov/projects/devglossary/
_severely_errored_second.html, October 2011. _severely_errored_second.html, October 2011.
[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.
[RFC6776] Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block", RFC 6776, October 2012.
[RFC6792] Hunt, G., "Monitoring Architectures for RTP", RFC 6792,
November 2012.
[SUMSTAT] Zorn, G., "RTCP XR for Summary Statistics Metrics [SUMSTAT] Zorn, G., "RTCP XR for Summary Statistics Metrics
Reporting", ID draft-zorn-xrblock-rtcp-xr-al-stat-06, Reporting", ID draft-zorn-xrblock-rtcp-xr-al-stat-06,
July 2012. July 2012.
Appendix A. Change Log Appendix A. 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.
A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-07
The following are the major changes compared to previous version:
o SDP update based on SDP Directorate Review.
A.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o Outdated reference update. o Outdated reference update.
o Editorial changes based on comments that applied to PDV and Delay o Editorial changes based on comments that applied to PDV and Delay
drafts. drafts.
Authors' Addresses Authors' Addresses
 End of changes. 15 change blocks. 
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