draft-ietf-xrblock-rtcp-xr-loss-conceal-04.txt   draft-ietf-xrblock-rtcp-xr-loss-conceal-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 G. Zorn, Ed. Intended status: Standards Track G. Zorn, Ed.
Expires: July 28, 2013 Network Zen Expires: September 26, 2013 Network Zen
C. Bi C. Bi
STTRI STTRI
Q. Wu, Ed. Q. Wu, Ed.
Huawei Huawei
January 24, 2013 March 25, 2013
RTCP XR Report Block for Concealment metrics Reporting on Audio RTCP XR Report Block for Concealment metrics Reporting on Audio
Applications Applications
draft-ietf-xrblock-rtcp-xr-loss-conceal-04.txt draft-ietf-xrblock-rtcp-xr-loss-conceal-05.txt
Abstract Abstract
This document defines two RTCP XR Report Blocks that allows the This document defines two RTCP XR Report Blocks that allows the
reporting of loss concealment metrics for audio applications of RTP. reporting of loss concealment metrics for audio applications of RTP.
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.
skipping to change at page 1, line 37 skipping to change at page 1, line 37
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 July 28, 2013. This Internet-Draft will expire on September 26, 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 23 skipping to change at page 2, line 23
1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 4 1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 4
1.3. Performance Metrics Framework . . . . . . . . . . . . . . 4 1.3. Performance Metrics Framework . . . . . . . . . . . . . . 4
1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 4 1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5
3. Loss Concealment Block . . . . . . . . . . . . . . . . . . . . 6 3. Loss Concealment Block . . . . . . . . . . . . . . . . . . . . 6
3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 6 3.1. Report Block Structure . . . . . . . . . . . . . . . . . . 6
3.2. Definition of Fields in Loss Concealment Report Block . . 6 3.2. Definition of Fields in Loss Concealment Report Block . . 6
4. Concealment Seconds Block . . . . . . . . . . . . . . . . . . 10 4. Concealment Seconds Block . . . . . . . . . . . . . . . . . . 10
4.1. Report Block Structure . . . . . . . . . . . . . . . . . . 10 4.1. Report Block Structure . . . . . . . . . . . . . . . . . . 10
4.2. Definition of Fields in Concealed Seconds Metrics Block . 10 4.2. Definition of Fields in Concealed Seconds Metrics Block . 11
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 15 5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 15 5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 15
5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 15 5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 15
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 16 6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 16
6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 16 6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 16
6.3. Contact information for registrations . . . . . . . . . . 16 6.3. Contact information for registrations . . . . . . . . . . 16
7. Security Considerations . . . . . . . . . . . . . . . . . . . 17 7. Security Considerations . . . . . . . . . . . . . . . . . . . 17
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 18 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 18
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10.1. Normative References . . . . . . . . . . . . . . . . . . . 20 10.1. Normative References . . . . . . . . . . . . . . . . . . . 20
10.2. Informative References . . . . . . . . . . . . . . . . . . 20 10.2. Informative References . . . . . . . . . . . . . . . . . . 20
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 21 Appendix A. Metrics represented using RFC6390 Template . . . . . 21
A.1. draft-ietf-xrblock-rtcp-xr-loss-conceal-04 . . . . . . . . 21 Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 28
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22 B.1. draft-ietf-xrblock-rtcp-xr-loss-conceal-05 . . . . . . . . 28
B.2. draft-ietf-xrblock-rtcp-xr-loss-conceal-04 . . . . . . . . 28
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 29
1. Introduction 1. Introduction
1.1. Loss Concealment and Concealment Seconds Metrics Reporting Block 1.1. Loss Concealment and Concealment Seconds Metrics Reporting Block
At any instant, the audio output at a receiver may be classified as At any instant, the audio output at a receiver may be classified as
either 'normal' or 'concealed'. 'Normal' refers to playout of audio either 'normal' or 'concealed'. 'Normal' refers to playout of audio
payload received from the remote end, and also includes locally payload received from the remote end, and also includes locally
generated signals such as announcements, tones and comfort noise. generated signals such as announcements, tones and comfort noise.
Concealment refers to playout of locally-generated signals used to Concealment refers to playout of locally-generated signals used to
mask the impact of network impairments or to reduce the audibility of mask the impact of network impairments or to reduce the audibility of
jitter buffer adaptations. jitter buffer adaptations.
This draft defines two new concealment related block types to augment This draft defines two new concealment related block types to augment
those defined in [RFC3611] for use in a range of RTP applications. those defined in [RFC3611] for use in a range of RTP applications.
These two block types extend packet loss concealment mechanism
defined in section 4.7.6 of RFC3611.
The first block type provides metrics for actions taken by the The first block type provides metrics for actions taken by the
receiver to mitigate the effect of packet loss and packet discard. receiver to mitigate the effect of packet loss and packet discard.
Specifically, the first metric (On-Time Playout Duration) reports the Specifically, the first metric (On-Time Playout Duration) reports the
duration of normal playout of data which the receiver obtained from duration of normal playout of data which the receiver obtained from
the sender's stream. A second metric (Loss Concealment Duration) the sender's stream. A second metric (Loss Concealment Duration)
reports the total time during which the receiver played out media reports the total time during which the receiver played out media
data which was manufactured locally, because the sender's data for data which was manufactured locally, because the sender's data for
these periods was not available due to packet loss or discard. A these periods was not available due to packet loss or discard. A
similar metric (Buffer Adjustment Concealment Duration) reports the similar metric (Buffer Adjustment Concealment Duration) reports the
skipping to change at page 3, line 40 skipping to change at page 3, line 42
is unavailable due to adaptation of an adaptive de-jitter buffer. is unavailable due to adaptation of an adaptive de-jitter buffer.
Further metrics (Playout Interrupt Count and Mean Playout Interrupt Further metrics (Playout Interrupt Count and Mean Playout Interrupt
Size) report the number of times normal playout was interrupted, and Size) report the number of times normal playout was interrupted, and
the mean duration of these interruptions. the mean duration of these interruptions.
Loss Concealment Duration and Buffer Adjustment Concealment Duration Loss Concealment Duration and Buffer Adjustment Concealment Duration
are reported separately because buffer adjustment is typically are reported separately because buffer adjustment is typically
arranged to occur in silence periods so may have very little impact arranged to occur in silence periods so may have very little impact
on user experience, whilst loss concealment may occur at any time. on user experience, whilst loss concealment may occur at any time.
The second block type provides metrics for concealment. The second block type provides metrics for concealment seconds, which
Specifically, the first metric (Unimpaired Seconds) reports the are measured at the receiving end of the RTP stream. Specifically,
number of whole seconds occupied only with normal playout of data the first metric (Unimpaired Seconds) reports the number of whole
which the receiver obtained from the sender's stream. The second seconds occupied only with normal playout of data which the receiver
metric (Concealed Seconds) reports the number of whole seconds during obtained from the sender's stream. The second metric (Concealed
which the receiver played out any locally-generated media data. A Seconds) reports the number of whole seconds during which the
third metric (Severely Concealed Seconds) reports the number of whole receiver played out any locally-generated media data. A third metric
seconds during which the receiver played out locally-generated data (Severely Concealed Seconds) reports the number of whole seconds
for more than SCS Threshold (ms). during which the receiver played out locally-generated data for more
than SCS Threshold (ms).
These metrics belongs to the class of transport-related terminal These metrics belongs to the class of transport-related terminal
metrics defined in [RFC6792]. metrics defined in [RFC6792].
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 that
MUST be used as defined in [RFC3550] and [RFC3611]. MUST be used as defined in [RFC3550] and [RFC3611].
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2. Terminology 2. Terminology
2.1. Standards Language 2.1. Standards Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC2119 [RFC2119]. document are to be interpreted as described in RFC2119 [RFC2119].
3. Loss Concealment Block 3. Loss Concealment Block
The metrics block described here are intended to be used as described
in this section, in conjunction with information from the Measurement
Information block [RFC6776]. Instances of this Metrics Block refer
by Synchronization source (SSRC) to the separate auxiliary
Measurement Information block [RFC6776] which describes measurement
periods in use (see [RFC6776] section 4.2). This Metrics Block
relies on the measurement period in the Measurement Information block
indicating the span of the report and SHOULD be sent in the same
compound RTCP packet as the measurement information block. If the
measurement period is not received in the same compound RTCP packet
as this Metrics Block, this metrics block MUST be discarded.
3.1. Report Block Structure 3.1. Report Block Structure
Loss Concealment metrics block Loss Concealment 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=NLC | I |plc| rsv. | block length=5 | | BT=NLC | I |plc| rsv. | block length=5 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source | | SSRC of Source |
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in use at the receiver, according to the following code: in use at the receiver, according to the following code:
bits 014-015 bits 014-015
0 = silence insertion 0 = silence insertion
1 = simple replay, no attenuation 1 = simple replay, no attenuation
2 = simple replay, with attenuation 2 = simple replay, with attenuation
3 = enhanced 3 = enhancement
Other values reserved Other values reserved
Note that the enhancment method (plc =3 )for packet loss
concealment offers an improved audio quality and or a better
robustness against packet losses [G.711] and is equivalent to
enhanced in section 4.7.1 of [RFC3611],
Reserved (resv): 4 bits Reserved (resv): 4 bits
These bits are reserved. They MUST be set to zero by senders and These bits are reserved. They MUST be set to zero by senders and
ignored by receivers (See [RFC6709] section 4.2). ignored by receivers (See [RFC6709] section 4.2).
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 Loss Concealment block, the block length is equal to 5. the Loss Concealment block, the block length is equal to 5.
skipping to change at page 10, line 7 skipping to change at page 10, line 7
The mean duration, in ms, of interruptions to normal playout which The mean duration, in ms, of interruptions to normal playout which
occurred during the reporting period. occurred during the reporting period.
If the measured value exceeds 0xFFFD, the value 0xFFFE MUST be If the measured value exceeds 0xFFFD, the value 0xFFFE MUST be
reported to indicate an over-range measurement. If the reported to indicate an over-range measurement. If the
measurement is unavailable, the value 0xFFFF MUST be reported. measurement is unavailable, the value 0xFFFF MUST be reported.
4. Concealment Seconds Block 4. Concealment Seconds Block
This sub-block provides a description of potentially audible This sub-block described here are intended to be used as described in
impairments due to lost and discarded packets at the endpoint, this section, in conjunction with information from the Measurement
expressed on a time basis analogous to a traditional PSTN T1/E1 Information block [RFC6776] and provides a description of potentially
errored seconds metric. audible impairments due to lost and discarded packets at the
endpoint, expressed on a time basis analogous to a traditional PSTN
T1/E1 errored seconds metric. Instances of this Metrics Block refer
by Synchronization source (SSRC) to the separate auxiliary
Measurement Information block [RFC6776] which describes measurement
periods in use (see [RFC6776] section 4.2). This Metrics Block
relies on the measurement period in the Measurement Information block
indicating the span of the report and SHOULD be sent in the same
compound RTCP packet as the measurement information block. If the
measurement period is not received in the same compound RTCP packet
as this Metrics Block, this metrics block MUST be discarded.
The following metrics are based on successive one second intervals as The following metrics are based on successive one second intervals as
declared by a local clock. This local clock does NOT need to be declared by a local clock. This local clock does NOT need to be
synchronized to any external time reference. The starting time of synchronized to any external time reference. The starting time of
this clock is unspecified. Note that this implies that the same loss this clock is unspecified. Note that this implies that the same loss
pattern could result in slightly different count values, depending on pattern could result in slightly different count values, depending on
where the losses occur relative to the particular one-second where the losses occur relative to the particular one-second
demarcation points. For example, two loss events occurring 50ms demarcation points. For example, two loss events occurring 50ms
apart could result in either one concealed second or two, depending apart could result in either one concealed second or two, depending
on the particular 1000 ms boundaries used. on the particular 1000 ms boundaries used.
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source | | SSRC of Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Unimpaired Seconds | | Unimpaired Seconds |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Concealed Seconds | | Concealed Seconds |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Severely Concealed Seconds | RESERVED | SCS Threshold | | Severely Concealed Seconds | RESERVED | SCS Threshold |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Report Block Structure Figure 2: Report Block Structure
4.2. Definition of Fields in Concealed Seconds Metrics Block 4.2. Definition of Fields in Concealed Seconds Metrics Block
Block type (BT): 8 bits Block type (BT): 8 bits
A Concealed Seconds Metrics Report Block is identified by the A Concealed Seconds Metrics Report Block is identified by the
constant NCS. constant NCS.
[Note to RFC Editor: please replace NCS with the IANA provided [Note to RFC Editor: please replace NCS with the IANA provided
RTCP XR block type for this block.] RTCP XR block type for this block.]
Interval Metric flag (I): 2 bit Interval Metric flag (I): 2 bit
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in use at the receiver, according to the following code: in use at the receiver, according to the following code:
bits 014-015 bits 014-015
0 = silence insertion 0 = silence insertion
1 = simple replay, no attenuation 1 = simple replay, no attenuation
2 = simple replay, with attenuation 2 = simple replay, with attenuation
3 = enhanced 3 = enhancement
Other values reserved Other values reserved
Note that the enhancement method (plc =3) for packet loss
concealment offers an improved audio quality and or a better
robustness against packet losses [G.711] and is equivalent to
enhanced in section 4.7.1 of [RFC3611],
Reserved (resv): 4 bits Reserved (resv): 4 bits
These bits are reserved. They MUST be set to zero by senders and These bits are reserved. They MUST be set to zero by senders and
ignored by receivers (See [RFC6709] section 4.2). ignored by receivers (See [RFC6709] section 4.2).
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 Concealment Seconds block, the block length is equal to 4. the Concealment Seconds block, the block length is equal to 4.
skipping to change at page 20, line 21 skipping to change at page 20, line 21
[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.
[RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control [RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control
Protocol Extended Reports (RTCP XR)", November 2003. Protocol Extended Reports (RTCP XR)", November 2003.
[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", July 2006. Description Protocol", July 2006.
[RFC6776] Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block", RFC 6776, August 2012.
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.
[RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design [RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design
Considerations for Protocol Extensions", RFC 6709, Considerations for Protocol Extensions", RFC 6709,
September 2012. September 2012.
[RFC6792] Hunt, G., "Monitoring Architectures for RTP", RFC 6792, [RFC6792] Hunt, G., "Monitoring Architectures for RTP", RFC 6792,
November 2012. November 2012.
[VAD] "http://en.wikipedia.org/wiki/Voice_activity_detection". [VAD] "http://en.wikipedia.org/wiki/Voice_activity_detection".
Appendix A. Change Log Appendix A. Metrics represented using RFC6390 Template
RFC EDITOR NOTE: please change XXXX in [RFCXXXX] by the new RFC
number, when assigned.
a. On-time Playout Duration Metric
* Metric Name: On-time Playout Duration
* Metric Description: 'On-time' playout is the uninterrupted,
in-sequence playout of valid decoded audio information
originating from the remote endpoint. On-time playout
Duration is playout duration of any signal other than those
used for concealment
* Method of Measurement or Calculation: See section 3. 2, On-
time Playout Duration definition [RFCXXXX].
* Units of Measurement: See section 3.2, On-time Playout
Duration definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 3rd paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
b. Loss Concealment Duration Metric
* Metric Name: Loss Concealment Duration
* Metric Description: The duration of audio playout
corresponding to Loss-type concealment.
* Method of Measurement or Calculation: See section 3.2, Loss
Concealment Duration definition [RFCXXXX].
* Units of Measurement: See section 3.2, Loss Concealment
Duration definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 3rd paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for
measurement timing and section 3. 2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
c. Buffer Adjustment Concealment Duration Metric
* Metric Name: Buffer Adjustment Concealment Duration
* Metric Description: The duration of audio playout
corresponding to Buffer Adjustment-type concealment.
* Method of Measurement or Calculation: See section 3. 2, Buffer
Adjustment Concealment Duration definition [RFCXXXX].
* Units of Measurement: See section 3.2, Buffer Adjustment
Concealment Duration definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 3rd paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
d. Playout Interrupt Count Metric
* Metric Name: Playout Interrupt Count
* Metric Description: The number of interruptions to normal
playout which occurred during the reporting period.
* Method of Measurement or Calculation: See section 3. 2,
Playout Interrupt Count definition [RFCXXXX].
* Units of Measurement: See section 3.2, Playout Interrupt Count
definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 3rd paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
e. Mean Playout Interrupt Size Metric
* Metric Name: Mean Playout Interrupt Size
* Metric Description: The mean duration of interruptions to
normal playout which occurred during the reporting period.
* Method of Measurement or Calculation: See section 3. 2,
Playout Interrupt Count definition [RFCXXXX].
* Units of Measurement: See section 3.2, Playout Interrupt Count
definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 3rd paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
f. Unimpaired Seconds Metric
* Metric Name: Unimpaired Seconds
* Metric Description: A count of the number of unimpaired
Seconds that have occurred.
* Method of Measurement or Calculation: See section 4. 2,
Unimpaired Seconds definition [RFCXXXX].
* Units of Measurement: See section 4.2, Unimpaired Seconds
definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 5th paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 paragraph [RFCXXXX] for
Interval Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
g. Concealed Seconds Metric
* Metric Name: Concealed Seconds
* Metric Description: A count of the number of Concealed Seconds
that have occurred.
* Method of Measurement or Calculation: See section 4. 2,
Concealed Seconds definition [RFCXXXX].
* Units of Measurement: See section 4.2, Concealed Seconds
definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 5th paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
h. Severely Concealed Seconds Metric
* Metric Name: Severely Concealed Seconds
* Metric Description: A count of the number of Severely
Concealed Seconds that have occurred.
* Method of Measurement or Calculation: See section 4. 2,
Severely Concealed Seconds definition [RFCXXXX].
* Units of Measurement: See section 4.2, Severely Concealed
Seconds definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 5th paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
i. SCS Threshold Metric
* Metric Name: SCS Threshold
* Metric Description: The amount of time corresponding to lost
or discarded frames that must occur within a one second period
in order for the second to be classified as a Severely
Concealed Second.
* Method of Measurement or Calculation: See section 4. 2, SCS
Threshold definition [RFCXXXX].
* Units of Measurement: See section 4.2, SCS Threshold
definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See
section 1.1, 5th paragraph [RFCXXXX].
* Measurement Timing: See section 4, 1st paragraph [RFCXXXX] for
measurement timing and section 4.2 [RFCXXXX] for Interval
Metric flag.
* Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611.
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.
A.1. draft-ietf-xrblock-rtcp-xr-loss-conceal-04 B.1. draft-ietf-xrblock-rtcp-xr-loss-conceal-05
The following are the major changes to previous version :
o Add text to clarify the definition of enhanced method.
o Add appendix to apply RFC6390 template to the metrics.
B.2. draft-ietf-xrblock-rtcp-xr-loss-conceal-04
The following are the major changes to previous version : The following are the major changes to previous version :
o Merge Concealment Seconds draft into this draft (i.e.,Loss o Merge Concealment Seconds draft into this draft (i.e.,Loss
Concealment draft). Concealment draft).
o Updated references. o Updated references.
Authors' Addresses Authors' Addresses
 End of changes. 19 change blocks. 
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