wdiff rfc6958.original rfc6958.txt

Audio/Video Transport Working Group
Internet Engineering Task Force (IETF) A. Clark
Internet-Draft
Request for Comments: 6958 Telchemy
Intended status:
Category: Standards Track S. Zhang
Expires: October 17, 2013
ISSN: 2070-1721 J. Zhao
STTRI
Q. Wu, Ed.
Huawei
April 15,
May 2013

RTP Control Protocol (RTCP) Extended Report (XR) Block for
Burst/Gap Loss metric Metric Reporting
draft-ietf-xrblock-rtcp-xr-burst-gap-loss-12.txt

Abstract

This document defines an RTP Control Protocol (RTCP) Extended Report
(XR) Block that allows the reporting of Burst burst and Gap Loss gap loss metrics
for use in a range of RTP applications.

Status of this This Memo

This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents an Internet Standards Track document.

This document is a product of the Internet Engineering Task Force
(IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list It represents the consensus of current Internet-
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Internet-Drafts are draft documents valid the IETF community. It has
received public review and has been approved for a maximum publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of six months RFC 5741.

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material or to cite them other than as "work in progress."

This Internet-Draft will expire on October 17, 2013.
http://www.rfc-editor.org/info/rfc6958.

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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2
1.1. Burst and Gap Burst/Gap Loss Report Metrics Block . . . . . . . . . . . . . 3 . 2
1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3
1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3
1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 4 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5 3
3. Burst/Gap Loss Metrics Block . . . . . . . . . . . . . . . . . . . . . 6 4
3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 6 5
3.2. Definition of Fields in Burst/Gap Loss Report Metrics Block . . . 6 5
3.3. Derived metrics based Metrics Based on reported metrics Reported Metrics . . . . . . . . 9 8
4. Considerations for Voice-over-IP applications Applications . . . . . . . . 11 8
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 12 9
5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 12 9
5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 12 9
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 9
6.1. New RTCP XR Block Type value . Value . . . . . . . . . . . . . . 13 9
6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 13 9
6.3. Contact information Information for registrations Registrations . . . . . . . . . . 13 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 14 10
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 15 10
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 16 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17 11
10.1. Normative References . . . . . . . . . . . . . . . . . . . 17 11
10.2. Informative References . . . . . . . . . . . . . . . . . . 17 11
Appendix A. Metrics represented using RFC6390 Represented Using the Template . . . . . 18
Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 23
B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-11 . . . . . . . 23
B.2. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-10 . . . . . . . 23
B.3. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-09 . . . . . . . 23
B.4. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-08 . . . . . . . 23
B.5. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-07 . . . . . . . 23
B.6. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-06 . . . . . . . 23
B.7. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04 . . . . . . . 24
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 25 from RFC 6390 13

1. Introduction

1.1. Burst and Gap Burst/Gap Loss Report Metrics Block

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
supports the reporting of the proportion of packets lost by the
network. The losses during loss bursts are reported, together with
the number of bursts and additional data data, allowing the calculation of
statistical parameters (mean and variance) of the distribution of
burst lengths. Some uses of these metrics depend on the availability
of the metric "cumulative number of packets lost" from RTCP
[RFC3550].

This block provides information on transient IP problems. Burst/Gap Burst/gap
metrics are typically used in Cumulative reports, however reports; however, they also
may be used in Interval reports. The burstiness of packet loss
affects user experience, may influence any sender strategies to
mitigate the problem, and may also have diagnostic value.

The metric belongs to the class of transport-related end system
metrics defined in [RFC6792].

The definitions of Burst, Gap, Loss "burst", "gap", "loss", and Discard "discard" are
consistent with definitions in [RFC3611]. To accommodate the range
of jitter buffer algorithms and packet discard logic that may be used
by implementors, the method used to distinguish between bursts and
gaps may be an equivalent method to that defined in [RFC3611]. The
method used should produce the same result as that defined in
[RFC3611] for conditions of burst packet loss, loss but may produce
different results for conditions of time varying time-varying jitter.

1.2. RTCP and RTCP XR Reports

The use of RTCP for reporting is defined in [RFC3550]. [RFC3611]
defined
defines an extensible structure for reporting by using an RTCP
Extended Report (XR). This document defines a new Extended Report
block for use with [RFC3550] and [RFC3611].

1.3. Performance Metrics Framework

The Performance Metrics Framework [RFC6390] provides guidance on the
definition and specification of performance metrics. The "Guidelines
for Use of the RTP Monitoring Architectures Framework" [RFC6792] provides guideline
guidelines for reporting block format using RTCP XR. The Metrics
Block described in this document are is in accordance with the guidelines
in [RFC6390] and [RFC6792].

1.4. Applicability

These metrics are applicable to a range of RTP applications which that
contain jitter buffers and don't use stream repair means, e.g.,
Forward Error Correction (FEC) [RFC5109] and/or retransmission
[RFC4588].

2. Terminology

2.1. Standards Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].

In addition, the following terms are defined:

Received, Lost Lost, and Discarded

A packet shall be regarded as lost if it fails to arrive within an
implementation-specific time window. A packet that arrives within
this time window but is too early or late to be played out or
thrown away before playout due to packet duplication or redundancy
shall be regarded as discarded. A packet shall be classified as
one of received (or OK), discarded discarded, or lost. The metric
"cumulative number of packets lost" defined in [RFC3550] reports a
count of packets lost from the media stream (single SSRC
Synchronization Source (SSRC) within a single RTP session). Similarly
Similarly, the metric "number of packets discarded" defined in
[DISCARD] reports a count of packets discarded from the media
stream (single SSRC within single RTP session) arriving at the
receiver. Another metric The post-repair Loss RLE metric, which is defined in
[RFC5725] is available
[RFC5725], can be used to report on the number of packets which that are
not recovered by any repair techniques which may be that are in use.

Bursts and Gaps

The terms Burst "burst" and Gap "gap" are used in a manner consistent with
that of RTCP XR [RFC3611]. RTCP XR views a an RTP stream as being
divided into bursts, which are periods during which when the loss rate is high
enough to cause noticeable quality degradation (generally over 5
percent loss rate), rate) and gaps, which are periods during which when lost packets
are infrequent and hence quality is generally acceptable.

3. Burst/Gap Loss Metrics Block

Metrics in this block report on Burst/Gap Loss burst/gap loss in the stream arriving
at the RTP system. The measurement of these metrics are is made at the
receiving end of the RTP stream. Instances Each instance of this Metrics Block
refer
refers by Synchronization source (SSRC) SSRC to the a separate auxiliary Measurement Information block [RFC6776] Block
[RFC6776], which describes the measurement periods in use(see RFC6776 section use (see RFC
6776, Section 4.2).

This Metrics Block relies on the measurement period in the
Measurement Information block Block indicating the span of the report.
Senders MUST send this block in the same compound RTCP packet as the
measurement information block.
Measurement Information Block. Receivers MUST verify that the
measurement period is received in the same compound RTCP packet as
this Metrics Block. If not, this Metrics Block MUST be discarded.

3.1. Report Block Structure

The structure of the Burst/Gap Loss metrics block Metrics Block is as follows.

0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BT=NBGL BT=20 | I |C| resv. | block length Block Length = 5 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+
| Threshold | Sum of Burst Durations (ms) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Packets Lost in Bursts | Total... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ...Packets expected Expected in bursts Bursts | Number of bursts Bursts | Sum of|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ...Squares of Burst Durations (ms-squared) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 1: Report Block Structure

3.2. Definition of Fields in Burst/Gap Loss Report Metrics Block

Block type Type (BT): 8 bits

A Burst/Gap Loss Report Metrics Block is identified by the constant NBGL.

[Note to RFC Editor: please replace NBGL with the IANA provided
RTCP XR block type for this block.] 20.

Interval Metric flag (I): 2 bits

This field is used to indicate whether the Burst/Gap Loss burst/gap loss metrics
are Sampled, Interval Interval, or Cumulative metrics:

I=10: Interval Duration - the reported value applies to the
most recent measurement interval duration between successive
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 Metrics burst/gap loss metrics can only be measured over
definite intervals, intervals and cannot be sampled. Also, the value I=00 is
reserved for future use. Senders MUST NOT use the values I=00 or
I=01. If a block is received with I=00 or I=01, the receiver MUST
discard the block.

Loss and Discard Combination flag (C): 1 bit

The 'C' flag is used to indicate whether the loss/discard report
is combined with the burst gap burst/gap loss report in the same compound
RTCP packet. The value is set to '1' if the loss/discard report
and the burst gap loss report are combined. Otherwise, the value
is set to '0'. If the 'C' flag is set to 1 '1' but the burst gap burst/gap
discard was not sent, the receiver MUST discard the burst gap burst/gap
loss.

Reserved (resv): (resv.): 5 bits

These bits are reserved. They MUST be set to zero by senders and
ignored by receivers (See RFC6709 section (see [RFC6709], Section 4.2).

block length:

Block Length: 16 bits

The length of this report block in 32-bit words, minus one. For
the Burst/Gap Loss block, Metrics Block, the block length is equal to 5.
The block MUST be discarded if the block length is set to a
different value.

SSRC of source: Source: 32 bits

As defined in Section 4.1 of [RFC3611].

Threshold: 8 bits

The Threshold is equivalent to Gmin in [RFC3611], i.e. i.e., the number
of successive packets that must be received prior to and following
a lost packet in order for this lost packet to be regarded as part
of a gap. Note that the threshold is calculated in accordance
with the Gmin Calculation defined in section Section 4.7.2 of RFC3611. RFC 3611.

Sum of Burst Durations (ms): 24 bits

The total duration of bursts of lost packets in the period of the
report (Interval or Cumulative).

The measured value is an unsigned value. If the measured value
exceeds 0xFFFFFD, the value 0xFFFFFE MUST be reported to indicate
an over-range measurement. If the measurement is unavailable, the
value 0xFFFFFF MUST be reported.

Packets lost Lost in bursts: Bursts: 24 bits

The total number of packets lost during loss bursts.

Total packets expected Packets Expected in bursts: Bursts: 24 bits

The total number of packets expected during loss bursts (that is,
the sum of received packets and lost packets).

Number of bursts: Bursts: 16 bits

The number of bursts in the period of the report (Interval or
Cumulative).

The measured value is an unsigned value. If the measured value
exceeds 0xFFFD, the value 0xFFFE MUST be reported to indicate an
over-range measurement. If the measurement is unavailable, the
value 0xFFFF MUST be reported.

Sum of Squares of Burst Durations (ms-squared): 36 bits

The sum of the squares of burst durations (where individual burst
durations are expressed in ms) over in the period of the report
(Interval or Cumulative). The units for this quantity are
milliseconds-squared.

The measured value is an unsigned value. If the measured value
exceeds 0xFFFFFFFFD, the value 0xFFFFFFFFE MUST be reported to
indicate an over-range measurement. If the measurement is
unavailable, the value 0xFFFFFFFFF MUST be reported.

3.3. Derived metrics based Metrics Based on reported metrics Reported Metrics

The metrics described here are intended to be used as described in
this section, in conjunction with information from the Measurement
Information block Block [RFC6776] and also with the metric "cumulative
number of packets lost" provided in standard RTCP [RFC3550].

These metrics provide information relevant to statistical parameters,
including:

o The the fraction of packets lost during bursts (i.e., Burst Loss Rate
in [SUMSTAT]), which can be calculated using the metric " Packets "Packets
Loss in Bursts " Bursts" and the metric " Total "Total Packets expected Expected in Bursts
" Bursts"
provided in the Burst/Gap Loss metrics block. Metrics Block.

o The the fraction of packets lost during gaps (i.e., Gap Loss Rate in
[SUMSTAT]), which can be calculated using the metric " Packets "Packets Loss
in Bursts " Bursts" and the metric " Total "Total Packets expected Expected in Bursts
" Bursts"
provided in the Burst/Gap Loss metrics block. Metrics Block.

o burst duration mean [SUMSTAT], which can be calculated using the
metric " Packets "Packets Loss in Bursts " Bursts" and the metric " Total "Total Packets
expected
Expected in Bursts " Bursts" provided in the Burst/Gap Loss metrics block. Metrics Block.

o burst duration variance [SUMSTAT], which can be calculated using
the metric " Packets "Packets Loss in Bursts " Bursts" and the metric " Total "Total Packets expected
Expected in Bursts " Bursts" provided in the Burst/Gap Loss
metrics block. Metrics Block.

The details on calculation of these parameters in the metrics are
described in [SUMSTAT].

4. Considerations for Voice-over-IP applications Applications

This Metrics Block is applicable to a broad range of RTP
applications. Where the metric is used with a Voice-overIP Voice-over-IP (VoIP)
application and the stream repair means is not available, the
following considerations apply.

RTCP XR views a call as being divided into bursts, which are periods
during which
when the loss rate is high enough to cause noticeable call quality
degradation (generally over 5 percent loss rate), and gaps, which are
periods during which when lost packets are infrequent and hence call quality is
generally acceptable.

If Voice Activity Detection is used, the Burst and Gap Duration Durations
shall be determined as if silence packets had been sent, i.e. i.e., a
period of silence in excess of Gmin packets will terminate a burst
condition.

The recommended value for the threshold Gmin in [RFC3611] results in
a Burst being causes a period of time
burst during which the call quality is degraded to a similar extent to
as it would be during a typical Pulse-Code Modulation(PCM) Pulse Code Modulation (PCM) Severely
Errored Second.

5. SDP Signaling

[RFC3611] defines the use of SDP (Session the Session Description Protocol) Protocol (SDP)
[RFC4566] for signaling the use of XR blocks. XR blocks MAY be used
without prior signaling.

5.1. SDP rtcp-xr-attrib Attribute Extension

This section augments the SDP [RFC4566] attribute "rtcp-xr" defined
in [RFC3611] by providing an additional value of "xr-format" to
signal the use of the report block defined in this document. The
ABNF [RFC5234] syntax is below.

xr-format =/ xr-bgl-block

xr-bgl-block = "burst-gap-loss"

5.2. Offer/Answer Usage

When SDP is used in offer-answer the offer/answer context, the SDP Offer/Answer
usage defined in [RFC3611] for unilateral "rtcp-xr" attribute
parameters applies. For detailed usage in Offer/Answer of offer/answer for
unilateral
parameter, parameters, refer to section Section 5.2 of [RFC3611].

6. IANA Considerations

New block types for RTCP XR are subject to IANA registration. For
general guidelines on IANA considerations for RTCP XR, refer to
[RFC3611].

6.1. New RTCP XR Block Type value Value

This document assigns the block type value NBGL 20 in the IANA " RTP "RTP
Control Protocol Extended Reports (RTCP XR) Block Type Registry " Registry" to
the "Burst/Gap Loss Metrics Block".

[Note to RFC Editor: please replace NBGL with the IANA provided RTCP
XR block type for this block.]

6.2. New RTCP XR SDP Parameter

This document also registers a new parameter "burst-gap-loss" in the
" RTP
"RTP Control Protocol Extended Reports (RTCP XR) Session Description
Protocol (SDP) Parameters Registry".

6.3. Contact information Information for registrations Registrations

The contact information for the registrations is:

Qin Wu (sunseawq@huawei.com)

101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China

7. Security Considerations

This block does not provide per-packet statistics, so the risk to
confidentiality documented in Section 7, paragraph 3 of [RFC3611]
does not apply. However However, the gaps indicated within this block could
be used to detect the timing of other events on the path between the
sender and receiver. For example, a competing multimedia stream
might cause a loss burst for the duration of the stream, allowing the
receiver of this block to know when the competing stream was active.
This risk is not a significant threat since the only information
leaked is the timing of the loss, not the cause. Besides this, it is
believed that this proposed RTCP XR report block introduces no other
new security considerations beyond those described in [RFC3611].

8. Contributors

Geoff Hunt wrote the initial draft of this document.

9. Acknowledgments

The authors gratefully acknowledge reviews and feedback provided by
Bruce Adams, Philip Arden, Amit Arora, Bob Biskner, Kevin Connor,
Claus Dahm, Randy Ethier, Roni Even, Jim Frauenthal, Albert Higashi,
Tom Hock, Shane Holthaus, Paul Jones, Rajesh Kumar, Keith Lantz,
Mohamed Mostafa, Amy Pendleton, Colin Perkins, Mike Ramalho, Ravi
Raviraj, Albrecht Schwarz, Tom Taylor, Hideaki Yamada, Adam Roach,
Dan Romascanu,Chris Romascanu, Chris Lonvick, Alfred C.,Morton C. Morton Jr., Pete Resnick, Ted
Lemon, Stephen Farrell, Richard Barnes, and Benoit Claise.

10. References

10.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V.
Jacobson, "RTP: A Transport Protocol for Real-Time
Applications", STD 64, RFC 3550, July 2003.

[RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control
Protocol Extended Reports (RTCP XR)", RFC 3611, November
2003.

[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006.

[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.

[RFC5725] Begen, A., Hsu, D., and M. Lague, "Post-Repair Loss RLE
Report Block Type for RTP Control Protocol (RTCP) Extended
Reports (XRs)", RFC 5725, February 2020. 2010.

10.2. Informative References

[DISCARD] Clark, A., Huang, R., and Q. Wu, Q., "RTCP XR Ed., "RTP Control
Protocol (RTCP) Extended Report (XR) Block for Discard
Count metric Reporting", ID draft-ietf-xrblock-rtcp-xr-discard-11,
December 2012. Work in Progress, April 2013.

[RFC4588] Rey, J., Leon, D., , Miyazaki, A., Varsa, V., and R.
Hakenberg, "RTP Retransmission Payload Format", RFC 4588,
July 2006.

[RFC5109] Li, A., "RTP Payload Format for Generic Forward Error
Correction", RFC 5109, December 2007.

[RFC6390] Clark, A. and B. Claise, "Framework "Guidelines for Considering New
Performance Metric Development", BCP 170, RFC 6390, July
October 2011.

[RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design
Considerations for Protocol Extensions", RFC 6709,
September 2012.

[RFC6776] Clark, A. and Q. Wu, Q., "Measurement Identity and information Information
Reporting
using SDES item Using a Source Description (SDES) Item and XR an
RTCP Extended Report (XR) Block", RFC 6776, October 2012.

[RFC6792] Wu, Q., Hunt, G., "Monitoring Architectures and P. Arden, "Guidelines for RTP", Use of the
RTP Monitoring Framework", RFC 6792, November 2012.

[SUMSTAT] Zorn, G., "RTCP XR Schott, R., Wu, Q., Ed., and R. Huang, "RTP
Control Protocol (RTCP) Extended Report (XR) Blocks for
Summary Statistics Metrics Reporting", ID draft-ietf-xrblock-rtcp-xr-summary-stat-11, Work in Progress,
March 2013.

Appendix A. Metrics represented using RFC6390 Represented Using the Template from RFC EDITOR NOTE: please change XXXX 6390

The six metrics defined in [RFCXXXX] by this document are described below using
the new template from Section 5.4.4 of RFC
number, when assigned. 6390.

a. Threshold Metric

* Metric Name: Threshold in RTP

* Metric Description: The Threshold is equivalent to Gmin in
[RFC3611], i.e. i.e., the number of successive RTP packets that
must be received prior to and following a lost RTP packet in
order for this lost RTP packet to be regarded as part of a
gap.

* Method of Measurement or Calculation: See section Section 3.2,
Threshold definition [RFCXXXX]. definition.

* Units of Measurement: See section Section 3.2, Threshold definition
[RFCXXXX]. definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611. RFC 3611.

b. Sum of Burst Durations Metric

* Metric Name: Sum of Burst Durations in RTP

* Metric Description: The total duration of bursts of lost RTP
packets in the period of the report.

* Method of Measurement or Calculation: See section Section 3.2, Sum of
Burst Durations definition [RFCXXXX]. definition.

* Units of Measurement: See section Section 3.2, Sum of Burst Durations
definition [RFCXXXX].
definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611. RFC 3611.

c. Packets lost Lost in bursts Bursts Metric

* Metric Name: RTP Packets lost in bursts

* Metric Description: The total number of RTP packets lost
during loss bursts.

* Method of Measurement or Calculation: See section Section 3.2, Packets
lost
Lost in bursts definition [RFCXXXX]. Bursts definition.

* Units of Measurement: See section Section 3.2, Packets lost in bursts
definition [RFCXXXX].
definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611. RFC 3611.

d. Total packets expected Packets Expected in bursts Bursts Metric

* Metric Name: Total RTP packets expected in bursts

* Metric Description: The total number of RTP packets expected
during loss bursts (that is, the sum of received RTP packets
and lost RTP packets).

* Method of Measurement or Calculation: See section Section 3.2, Total
packets expected in bursts definition [RFCXXXX]. definition.

* Units of Measurement: See section Section 3.2, Total packets expected
in bursts definition [RFCXXXX]. definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611. RFC 3611.

e. Number of bursts Bursts Metric

* Metric Name: Number of bursts in RTP

* Metric Description: The total duration of bursts of lost RTP
packets in the period of the report.

* Method of Measurement or Calculation: See section Section 3.2, Number
of bursts definition [RFCXXXX]. definition.

* Units of Measurement: See section Section 3.2, Number of bursts
definition [RFCXXXX].
definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611. RFC 3611.

f. Sum of Squares of Burst Durations Metric

* Metric Name: Sum of Squares of Burst Durations in RTP

* Metric Description: The sum of the squares of burst durations
(where individual burst durations are expressed in ms) over in
the period of the report.

* Method of Measurement or Calculation: See section Section 3.2, Sum of
Squares of Burst Durations definition [RFCXXXX]. definition.

* Units of Measurement: See section Section 3.2, Sum of Squares of Burst
Durations definition [RFCXXXX]. definition.

* Measurement Point(s) with Potential Measurement Domain: See
section
Section 3, 1st paragraph [RFCXXXX]. paragraph.

* Measurement Timing: See section Section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section Section 3.2 [RFCXXXX] for Interval Metric flag.

* Use and applications: Applications: See section 1.4 [RFCXXXX]. Section 1.4.

* Reporting model: Model: See RFC3611.

Appendix B. Change Log

Note to the RFC-Editor: please remove this section prior to
publication as an RFC.

B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-loss-11