draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04.txt   draft-ietf-xrblock-rtcp-xr-burst-gap-loss-05.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 S. Zhang, Ed. Intended status: Standards Track S. Zhang, Ed.
Expires: April 14, 2013 J. Zhao Expires: June 3, 2013 J. Zhao
STTRI STTRI
Q. Wu Q. Wu
Huawei Huawei
October 11, 2012 November 30, 2012
RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap
Loss metric Reporting Loss metric Reporting
draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04.txt draft-ietf-xrblock-rtcp-xr-burst-gap-loss-05.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 Burst and Gap Loss metrics (XR) Block that allows the reporting of Burst and Gap Loss metrics
for use in a range of RTP 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
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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 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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6.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 12 6.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 12
6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 12 6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 12
6.3. Contact information for registrations . . . . . . . . . . 12 6.3. Contact information for registrations . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13 7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10.1. Normative References . . . . . . . . . . . . . . . . . . . 16 10.1. Normative References . . . . . . . . . . . . . . . . . . . 16
10.2. Informative References . . . . . . . . . . . . . . . . . . 16 10.2. Informative References . . . . . . . . . . . . . . . . . . 16
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 17 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 17
A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04 . . . . . . . 17 A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-05 . . . . . . . 17
A.2. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04 . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18
1. Introduction 1. Introduction
1.1. Burst and Gap Loss Report Block 1.1. Burst and Gap Loss Report 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 proportion of packets lost by the supports the reporting of the proportion of packets lost by the
network. The losses during loss bursts are reported, together with network. The losses during loss bursts are reported, together with
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of the metric "cumulative number of packets lost" from RTCP of the metric "cumulative number of packets lost" from RTCP
[RFC3550]. [RFC3550].
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 loss affects user in Interval reports. The burstiness of packet loss 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]. The method used equivalent method to that defined in [RFC3611]. The method used
SHOULD produce the same result as that defined in [RFC3611] for SHOULD produce the same result as that defined in [RFC3611] for
conditions of burst packet loss, but MAY produce different results conditions of burst packet loss, but MAY produce different results
for conditions of time varying jitter. for conditions of time varying jitter.
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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Block type (BT): 8 bits Block type (BT): 8 bits
A Burst/Gap Loss Report Block is identified by the constant NBGL. A Burst/Gap Loss Report Block is identified by the constant NBGL.
[Note to RFC Editor: please replace NBGL with the IANA provided [Note to RFC Editor: please replace NBGL 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 Loss metrics This field is used to indicate whether the Burst/Gap Loss metrics
are Sampled, Interval or Cumulative metrics, that is, whether the are Sampled, Interval or Cumulative metrics:
reported values applies to the most recent measurement interval
duration between successive metrics reports (I=10) (the Interval
Duration) or to the accumulation period characteristic of
cumulative measurements (I=11) (the Cumulative Duration) or is a
sampled instantaneous value (I=01) (Sampled Value). In this
document, Burst/Gap Loss Metric is not measured at a particular
time instant but over one or several reporting intervals.
Therefore Burst/Gap Loss Metric MUST not be chosen as Sampled I=10: Interval Duration - the reported value applies to the
Metric. In this document, Burst/Gap Loss Metric is not measured most recent measurement interval duration between successive
at a particular time instant but over one or several reporting metrics reports.
I=11: Cumulative Duration - the reported value applies to the
accumulation period characteristic of cumulative measurements.
I=01: Sampled Value - the reported value is a sampled
instantaneous value.
In this document, Burst/Gap Loss Metric is not measured at a
particular time instant but over one or several reporting
intervals. Therefore Burst/Gap Loss Metric MUST NOT be chosen as intervals. Therefore Burst/Gap Loss Metric MUST NOT be chosen as
Sampled Metric. Sampled Metric.
Loss and Discard Combination flag (C): 1 bit Loss and Discard Combination flag (C): 1 bit
The 'C' flag is used to indicate whether combining loss/discard The 'C' flag is used to indicate whether combining loss/discard
report is needed. This field MUST be set to '1' if the burst gap report is needed. This field MUST be set to '1' if the burst gap
loss report is present in conjunction with the burst gap discard loss report is present in conjunction with the burst gap discard
report in the same compound RTCP packet and MUST be set to '0' report in the same compound RTCP packet and MUST be set to '0'
otherwise. If the burst gap discard is not sent with the burst otherwise. If the burst gap discard is not sent with the burst
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If the measured value exceeds 0xFFFFFFFFD, the value 0xFFFFFFFFE If the measured value exceeds 0xFFFFFFFFD, the value 0xFFFFFFFFE
SHOULD be reported to indicate an over-range measurement. If the SHOULD be reported to indicate an over-range measurement. If the
measurement is unavailable, the value 0xFFFFFFFFF SHOULD be measurement is unavailable, the value 0xFFFFFFFFF SHOULD be
reported. reported.
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 as described in The metrics described here are intended to be used as described in
this section, in conjunction with information from the Measurement this section, in conjunction with information from the Measurement
Information block [MEASID] (which MUST be present in the same RTCP Information block [RFC6776] (which MUST be present in the same RTCP
packet as the Burst/Gap Loss block) and also with the metric packet as the Burst/Gap Loss block) and also with the metric
"cumulative number of packets lost" provided in standard RTCP "cumulative number of packets lost" provided in standard RTCP
[RFC3550]. [RFC3550].
These metrics provides information relevant to statistical These metrics provides information relevant to statistical
parameters, including: parameters, including:
o The fraction of packets lost during bursts (i.e., Burst Loss Rate o The fraction of packets lost during bursts (i.e., Burst Loss Rate
in [SUMSTAT]) in [SUMSTAT])
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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-bgl-block xr-format =/ xr-bgl-block
xr-bgl-block = "brst-gap-loss" xr-bgl-block = "brst-gap-loss"
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 NDEL in the IANA "RTCP XR This document assigns the block type value NDEL in the IANA "RTCP XR
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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 metric [DISCARD] Hunt, G., "RTCP XR Report Block for Discard 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, July 2011. Development", RFC 6390, July 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-loss-04 A.1. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-05
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-loss-04
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. 14 change blocks. 
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