draft-ietf-xrblock-rtcp-xr-delay-09.txt   draft-ietf-xrblock-rtcp-xr-delay-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 K. Gross Intended status: Standards Track K. Gross
Expires: March 22, 2013 AVA Networks Expires: April 11, 2013 AVA Networks
Q. Wu Q. Wu
Huawei Huawei
September 18, 2012 October 8, 2012
RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay metric RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay metric
Reporting Reporting
draft-ietf-xrblock-rtcp-xr-delay-09.txt draft-ietf-xrblock-rtcp-xr-delay-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 Delay metrics for use in a (XR) Block that allows the reporting of Delay metrics for use in a
range of Real-time Transport Protocol (RTP) applications. range of Real-time Transport Protocol 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
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 March 22, 2013. This Internet-Draft will expire on April 11, 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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1.1. Packet Delay Metrics Block . . . . . . . . . . . . . . . . 3 1.1. Packet Delay Metrics 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 . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 4 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 4
3. Delay Block . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Delay Block . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 5 3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 5
3.2. Definition of Fields in Delay Metrics Report Block . . . . 5 3.2. Definition of Fields in Delay Metrics Report Block . . . . 5
4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 8 4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 8
4.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
5.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 9 5.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 9
5.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 9 5.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 9
5.3. Contact information for registrations . . . . . . . . . . 9 5.3. Contact information for registrations . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 10
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 11 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . . 13 9.1. Normative References . . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . . 13 9.2. Informative References . . . . . . . . . . . . . . . . . . 13
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 14 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 14
A.1. draft-ietf-xrblock-rtcp-xr-delay-09 . . . . . . . . . . . 14 A.1. draft-ietf-xrblock-rtcp-xr-delay-10 . . . . . . . . . . . 14
A.2. draft-ietf-xrblock-rtcp-xr-delay-08 . . . . . . . . . . . 14 A.2. draft-ietf-xrblock-rtcp-xr-delay-09 . . . . . . . . . . . 14
A.3. draft-ietf-xrblock-rtcp-xr-delay-07 . . . . . . . . . . . 14 A.3. draft-ietf-xrblock-rtcp-xr-delay-08 . . . . . . . . . . . 14
A.4. draft-ietf-xrblock-rtcp-xr-delay-06 . . . . . . . . . . . 14 A.4. draft-ietf-xrblock-rtcp-xr-delay-07 . . . . . . . . . . . 14
A.5. draft-ietf-xrblock-rtcp-xr-delay-05 . . . . . . . . . . . 14 A.5. draft-ietf-xrblock-rtcp-xr-delay-06 . . . . . . . . . . . 14
A.6. draft-ietf-xrblock-rtcp-xr-delay-04 . . . . . . . . . . . 14 A.6. draft-ietf-xrblock-rtcp-xr-delay-05 . . . . . . . . . . . 14
A.7. draft-ietf-xrblock-rtcp-xr-delay-03 . . . . . . . . . . . 15 A.7. draft-ietf-xrblock-rtcp-xr-delay-04 . . . . . . . . . . . 15
A.8. draft-ietf-xrblock-rtcp-xr-delay-02 . . . . . . . . . . . 15 A.8. draft-ietf-xrblock-rtcp-xr-delay-03 . . . . . . . . . . . 15
A.9. draft-ietf-xrblock-rtcp-xr-delay-01 . . . . . . . . . . . 15 A.9. draft-ietf-xrblock-rtcp-xr-delay-02 . . . . . . . . . . . 15
A.10. draft-ietf-xrblock-rtcp-xr-delay-00 . . . . . . . . . . . 15 A.10. draft-ietf-xrblock-rtcp-xr-delay-01 . . . . . . . . . . . 15
A.11. draft-ietf-xrblock-rtcp-xr-delay-00 . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction 1. Introduction
1.1. Packet Delay Metrics Block 1.1. Packet Delay Metrics Block
This draft defines a new block type to augment those defined in This draft 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 mean, minimum and maximum values of the supports the reporting of the mean, minimum and maximum values of the
network round-trip delay between RTP interfaces in peer RTP end network round-trip delay between RTP interfaces in peer RTP end
systems as measured, for example, using the RTCP method described in systems as measured, for example, using the RTCP method described in
[RFC3550]. It also supports reporting of the component of the round- [RFC3550]. It also supports reporting of the component of the round-
trip delay internal to the local RTP system. trip delay internal to the local RTP system.
The network metrics belong to the class of packet transport delay The network metrics belong to the class of transport metrics defined
metrics defined in [MONARCH]. in [MONARCH].
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 draft defines a new Extended Report block that Report (XR). This draft defines a new Extended Report block for use
MUST be used as defined in [RFC3550] and [RFC3611]. 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. The RTP definition and specification of performance metrics. The RTP
Monitoring Architectures [MONARCH] provides guideline for reporting Monitoring Architectures [MONARCH] provides guideline for reporting
block format using RTCP XR. The Metrics Block described in this block format using RTCP XR. The Metrics Block described in this
document are in accordance with the guidelines in [RFC6390] and document are in accordance with the guidelines in [RFC6390] and
[MONARCH]. [MONARCH].
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Metrics in this block report on packet delay in the stream arriving Metrics in this block report on packet delay in the stream arriving
at the RTP system. The measurement of these metrics are made either at the RTP system. The measurement of these metrics are made either
at the receiving end of the RTP stream or at the sending end of the at the receiving end of the RTP stream or at the sending end of the
RTP stream. Instances of this Metrics Block refer by Synchronization RTP stream. Instances of this Metrics Block refer by Synchronization
source (SSRC) to the separate auxiliary Measurement Information block source (SSRC) to the separate auxiliary Measurement Information block
[MEASI] which contains measurement intervals. This metric block [MEASI] which contains measurement intervals. This metric block
relies on the measurement interval in the Measurement Information relies on the measurement interval in the Measurement Information
block indicating the span of the report and SHOULD be sent in the block indicating the span of the report and SHOULD be sent in the
same compound RTCP packet as the measurement information block. If same compound RTCP packet as the measurement information block. If
the measurement interval is not received in the same compound RTCP the measurement interval is not received in the same compound RTCP
packet as this metric block, this metric block SHOULD be discarded packet as this metric block, this metric block MUST be discarded.
(See [MONARCH] section 5.4 for more timing details).
3.1. Report Block Structure 3.1. Report Block Structure
Delay metrics block Delay metrics block
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BT=NDEL | I | resv. | block length = 6 | | BT=NDEL | I | resv. | block length = 6 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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If the measurement is unavailable, the value of this field with If the measurement is unavailable, the value of this field with
all bits set to 1 MUST be reported. all bits set to 1 MUST be reported.
4. SDP Signaling 4. SDP Signaling
[RFC3611] defines the use of SDP (Session Description Protocol) [RFC3611] defines the use of SDP (Session Description Protocol)
[RFC4566] for signaling the use of XR blocks. XR blocks MAY be used [RFC4566] for signaling the use of XR blocks. XR blocks MAY be used
without prior signaling. without prior signaling.
4.1. SDP rtcp-xr-attrib Attribute Extension
This section augments the SDP [RFC4566] attribute "rtcp-xr" defined This section augments the SDP [RFC4566] attribute "rtcp-xr" defined
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-delay-block xr-format =/ xr-delay-block
xr-delay-block ="delay" xr-delay-block ="delay"
4.2. Offer/Answer Usage
When SDP is used in offer-answer context, the SDP Offer/Answer usage
defined in [RFC3611] applies.
5. IANA Considerations 5. 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].
5.1. New RTCP XR Block Type value 5.1. New RTCP XR Block Type value
This document assigns the block type value NDEL in the IANA "RTCP XR This document assigns the block type value NDEL in the IANA "RTCP XR
Block Type Registry" to the "Delay Metrics Block". Block Type Registry" to the "Delay Metrics Block".
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Qin Wu (sunseawq@huawei.com) Qin Wu (sunseawq@huawei.com)
101 Software Avenue, Yuhua District 101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012 Nanjing, Jiangsu 210012
China China
6. Security Considerations 6. Security Considerations
It is believed that this proposed RTCP XR report block introduces no It is believed that this proposed RTCP XR report block introduces no
new security considerations beyond those described in [RFC3611]. new security considerations beyond those described in [RFC3611].
This block does not provide per-packet statistics so the risk to This block does not provide per-packet statistics, so the risk to
confidentiality documented in Section 7, paragraph 3 of [RFC3611] confidentiality documented in Section 7, paragraph 3 of [RFC3611]
does not apply. does not apply.
7. Contributors 7. Contributors
Geoff Hunt wrote the initial version of this document. Geoff Hunt wrote the initial version of this document.
8. Acknowledgments 8. Acknowledgments
The authors gratefully acknowledge the comments and contributions The authors gratefully acknowledge the comments and contributions
skipping to change at page 13, line 29 skipping to change at page 13, line 29
Description Protocol", July 2006. Description Protocol", July 2006.
[RFC5905] Mills, D., Martin, J., Burbank, J., and W. Kasch, "Network [RFC5905] Mills, D., Martin, J., Burbank, J., and W. Kasch, "Network
Time Protocol Version 4: Protocol and Algorithms Time Protocol Version 4: Protocol and Algorithms
Specification", RFC 5905, June 2010. Specification", RFC 5905, June 2010.
9.2. Informative References 9.2. Informative References
[MEASI] Hunt, G., "Measurement Identity and information Reporting [MEASI] Hunt, G., "Measurement Identity and information Reporting
using SDES item and XR Block", using SDES item and XR Block",
ID draft-ietf-xrblock-rtcp-xr-meas-identity-09, July 2012. ID draft-ietf-xrblock-rtcp-xr-meas-identity-10,
August 2012.
[MONARCH] Hunt, G., "Monitoring Architectures for RTP", [MONARCH] Hunt, G., "Monitoring Architectures for RTP",
ID draft-ietf-avtcore-monarch-18, August 2012. ID draft-ietf-avtcore-monarch-22, September 2012.
[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.
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-delay-09 A.1. draft-ietf-xrblock-rtcp-xr-delay-10
The following are the major changes to previous version :
o Editorial changes based on SDP directorate Review.
A.2. draft-ietf-xrblock-rtcp-xr-delay-09
The following are the major changes to previous version : The following are the major changes to previous version :
o Editorial changes based on comments that are applied to PDV draft. o Editorial changes based on comments that are applied to PDV draft.
A.2. draft-ietf-xrblock-rtcp-xr-delay-08 A.3. draft-ietf-xrblock-rtcp-xr-delay-08
The following are the major changes to previous version : The following are the major changes to previous version :
o Move Geoff Hunt from author list to Contributors section based on o Move Geoff Hunt from author list to Contributors section based on
his suggestion. his suggestion.
A.3. draft-ietf-xrblock-rtcp-xr-delay-07 A.4. draft-ietf-xrblock-rtcp-xr-delay-07
The following are the major changes to previous version : The following are the major changes to previous version :
o Editorial changes. o Editorial changes.
o Reference updates. o Reference updates.
A.4. draft-ietf-xrblock-rtcp-xr-delay-06 A.5. draft-ietf-xrblock-rtcp-xr-delay-06
The following are the major changes to previous version : The following are the major changes to previous version :
o Editorial changes. o Editorial changes.
A.5. draft-ietf-xrblock-rtcp-xr-delay-05 A.6. draft-ietf-xrblock-rtcp-xr-delay-05
The following are the major changes to previous version : The following are the major changes to previous version :
o One typo fixed. o One typo fixed.
A.6. draft-ietf-xrblock-rtcp-xr-delay-04 A.7. draft-ietf-xrblock-rtcp-xr-delay-04
The following are the major changes to previous version : The following are the major changes to previous version :
o Revise the definition of sampled metric to get alignment with o Revise the definition of sampled metric to get alignment with
MONARCH. MONARCH.
o Clarify sending the metric block in the same RTCP compound packet o Clarify sending the metric block in the same RTCP compound packet
as the measurement information block. as the measurement information block.
A.7. draft-ietf-xrblock-rtcp-xr-delay-03 A.8. draft-ietf-xrblock-rtcp-xr-delay-03
The following are the major changes to previous version : The following are the major changes to previous version :
o Allocate 64 bit for end system delay and represent it using 64 bit o Allocate 64 bit for end system delay and represent it using 64 bit
NTP-Timestamp. NTP-Timestamp.
o Other editorial changes. o Other editorial changes.
A.8. draft-ietf-xrblock-rtcp-xr-delay-02 A.9. draft-ietf-xrblock-rtcp-xr-delay-02
The following are the major changes to previous version : The following are the major changes to previous version :
o Allocate 32bits for each metrics and change unit for each metric o Allocate 32bits for each metrics and change unit for each metric
from ms to 1/65536 seconds. from ms to 1/65536 seconds.
A.9. draft-ietf-xrblock-rtcp-xr-delay-01 A.10. draft-ietf-xrblock-rtcp-xr-delay-01
The following are the major changes to previous version : The following are the major changes to previous version :
o Updated references. o Updated references.
o Allocate one more bit for Interval metric flag to indicate sampled o Allocate one more bit for Interval metric flag to indicate sampled
metric can be used. metric can be used.
o add a few clarification text for failure mode. o add a few clarification text for failure mode.
A.10. draft-ietf-xrblock-rtcp-xr-delay-00 A.11. draft-ietf-xrblock-rtcp-xr-delay-00
The following are the major changes to previous version : The following are the major changes to previous version :
o Changed BNF for SDP following Christian Groves' and Tom Taylor's o Changed BNF for SDP following Christian Groves' and Tom Taylor's
comments (4th and 5th May 2009). comments (4th and 5th May 2009).
o Updated references. o Updated references.
Authors' Addresses Authors' Addresses
 End of changes. 25 change blocks. 
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