draft-ietf-xrblock-rtcp-xr-summary-stat-06.txt   draft-ietf-xrblock-rtcp-xr-summary-stat-07.txt 
Network Working Group G. Zorn, Ed. Network Working Group G. Zorn, Ed.
Internet-Draft Network Zen Internet-Draft Network Zen
Intended status: Standards Track R. Schott Intended status: Standards Track R. Schott
Expires: July 20, 2013 Deutsche Telekom Expires: August 8, 2013 Deutsche Telekom
Q. Wu Q. Wu
R. Huang R. Huang
Huawei Huawei
January 16, 2013 February 4, 2013
RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Summary RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Summary
Statistics Metrics Reporting Statistics Metrics Reporting
draft-ietf-xrblock-rtcp-xr-summary-stat-06 draft-ietf-xrblock-rtcp-xr-summary-stat-07
Abstract Abstract
This document defines three RTP Control Protocol (RTCP) Extended This document defines three RTP Control Protocol (RTCP) Extended
Report (XR) Blocks that allow the reporting of loss, duplication and Report (XR) Blocks that allow the reporting of loss, duplication and
discard summary statistics metrics in a range of RTP applications. discard summary statistics metrics 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 July 20, 2013. This Internet-Draft will expire on August 8, 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
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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. Transport Related End System Metrics . . . . . . . . . . . . . 4 3. Transport Related End System Metrics . . . . . . . . . . . . . 4
3.1. Burst/Gap Loss Summary Statistics Metrics Block . . . . . 4 3.1. Burst/Gap Loss Summary Statistics Metrics Block . . . . . 4
3.1.1. Report Block Structure . . . . . . . . . . . . . . . . 5 3.1.1. Report Block Structure . . . . . . . . . . . . . . . . 5
3.1.2. Definition of Fields in Loss Summary Statistics 3.1.2. Definition of Fields in Loss Summary Statistics
Block . . . . . . . . . . . . . . . . . . . . . . . . 5 Block . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Burst/Gap Discard Summary Statistics Metrics Block . . . . 7 3.2. Burst/Gap Discard Summary Statistics Metrics Block . . . . 7
3.2.1. Report Block Structure . . . . . . . . . . . . . . . . 7 3.2.1. Report Block Structure . . . . . . . . . . . . . . . . 8
3.2.2. Definition of Fields in Burst/Gap Discard Summary 3.2.2. Definition of Fields in Burst/Gap Discard Summary
Statistics Block . . . . . . . . . . . . . . . . . . . 8 Statistics Block . . . . . . . . . . . . . . . . . . . 8
4. Application Level Metrics . . . . . . . . . . . . . . . . . . 9 4. Application Level Metrics . . . . . . . . . . . . . . . . . . 10
4.1. Frame Impairment Statistics Summary Metrics Block . . . . 9 4.1. Frame Impairment Statistics Summary Metrics Block . . . . 10
4.1.1. Report Block Structure . . . . . . . . . . . . . . . . 10 4.1.1. Report Block Structure . . . . . . . . . . . . . . . . 10
4.1.2. Definition of Fields in Frame Impairment Summary 4.1.2. Definition of Fields in Frame Impairment Summary
Statistics Block . . . . . . . . . . . . . . . . . . . 10 Statistics Block . . . . . . . . . . . . . . . . . . . 10
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 12 5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 12 5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 12
5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 12 5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 13
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 12 6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 13
6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 13 6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 13
6.3. Contact information for registrations . . . . . . . . . . 13 6.3. Contact information for registrations . . . . . . . . . . 14
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13 7. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9.1. Normative References . . . . . . . . . . . . . . . . . . . 14 9.1. Normative References . . . . . . . . . . . . . . . . . . . 14
9.2. Informative References . . . . . . . . . . . . . . . . . . 14 9.2. Informative References . . . . . . . . . . . . . . . . . . 15
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 15 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 15
A.1. draft-ietf-xrblock-rtcp-xr-summary-stat-06 . . . . . . . . 15 A.1. draft-ietf-xrblock-rtcp-xr-summary-stat-07 . . . . . . . . 15
A.2. draft-ietf-xrblock-rtcp-xr-summary-stat-05 . . . . . . . . 15 A.2. draft-ietf-xrblock-rtcp-xr-summary-stat-06 . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15 A.3. draft-ietf-xrblock-rtcp-xr-summary-stat-05 . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction 1. Introduction
1.1. Summary Statistics Metrics 1.1. Summary Statistics Metrics
This draft defines three new block types to augment those defined in This draft defines three new block types to augment those defined in
[RFC3611] for use in a range of RTP applications. [RFC3611] for use in a range of RTP applications.
o Burst/Gap Loss Summary Statistics Metrics Block
o Burst/Gap Discard Summary Statistics Metrics Block
o Frame Impairment Statistics Summary Metrics Block
The first two block types support the reporting of burst gap loss/ The first two block types support the reporting of burst gap loss/
discard summary statistics including packet loss/discard proportion, discard summary statistics including packet loss/discard proportion,
mean and variance and belong to the class of transport-related end mean and variance and belong to the class of transport-related end
system metrics defined in [RFC6792]. These two blocks are intended system metrics defined in [RFC6792]. These two blocks are intended
to be used in conjunction with information from the Burst Gap Loss to be used in conjunction with information from the Burst Gap Loss
Metrics Block or Burst Gap Discard Metrics Block, and on which these Metrics Block [BGLOSS] or Burst Gap Discard Metrics Block
two block therefore depend. The metrics in the Burst Gap Loss block [BGDISCARD], and on which these two blocks therefore depend. The
or Burst Gap Discard Metrics Block can be used independently of the metrics in the Burst Gap Loss Metrics block or Burst Gap Discard
metrics defined in the first two blocks. Metrics Block are consistent with the definitions of Burst, Gap, Loss
and Discard in RTCP XR [RFC3611].
The third block supports the reporting of detailed statistics for The third block supports the reporting of detailed video statistics
each frame type, including the number of frames received, lost and for each frame type, including the number of frames received, lost
discarded of each frame type in the Group of Pictures (GOP) and and discarded of each frame type in the Group of Pictures (GOP) and
additional data allowing the calculation of statistical parameters additional data allowing the calculation of statistical parameters
(e.g.,the proportion of each frame type impaired by packet loss and (e.g.,the proportion of each frame type impaired by packet loss and
discard). The metrics defined in this block belong to the class of discard). The metrics defined in this block belong to the class of
application layer metrics defined in [RFC6792]. application layer 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 document defines a new Extended Report block for Report (XR). This document defines a new Extended Report block for
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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 RFC 2119 [RFC2119]. document are to be interpreted as described in RFC 2119 [RFC2119].
In addition, the following terms are defined: In addition, the following terms are defined:
Picture Type Picture Type
Picture Types used in the different video algorithms are composed Picture Types used in the different video algorithms are composed
of the Key frame and Derived frames. The Key frame is also called of the Key frame and Derived frames. The Key frame is
a reference frame and used as a reference for predicting other independently coded without prediction from other pictures and
pictures. It is coded without prediction from other pictures. used as a reference frame for predicting other pictures. Derived
Derived frames are derived from a Key frame using a prediction frames are predicatively coded and derived from a Key frame using
algorithm. a prediction algorithm.
3. Transport Related End System Metrics 3. Transport Related End System Metrics
3.1. Burst/Gap Loss Summary Statistics Metrics Block 3.1. Burst/Gap Loss Summary Statistics Metrics Block
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 [RFC6776] (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
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SSRC of Source: 32 bits SSRC of Source: 32 bits
As defined in Section 4.1 of RFC3611 [RFC3611]. As defined in Section 4.1 of RFC3611 [RFC3611].
Burst Loss Rate: 16 bits Burst Loss Rate: 16 bits
The fraction of packets lost during bursts since the beginning of The fraction of packets lost during bursts since the beginning of
reception, expressed as a fixed point number with the binary point reception, expressed as a fixed point number with the binary point
at the left edge of the field. This value is calculated by at the left edge of the field. This value is calculated by
dividing Packets Loss in Bursts by Total Packets expected in dividing Packets Loss in Bursts by Total Packets expected in
Bursts as follows: Bursts, multiplying the result of the division by 7FFF, with the
maximum value 7FFF, and taking the integer part as follows:
Packets Loss in Bursts / Total Packets expected in Bursts Packets Loss in Bursts / Total Packets expected in Bursts
If the measurement is unavailable, the value 0x8000 MUST be
reported.
Gap Loss Rate: 16 bits Gap Loss Rate: 16 bits
The fraction of packets lost during gaps since the beginning of The fraction of packets lost during gaps since the beginning of
reception expressed as a fixed point number with the binary point reception expressed as a fixed point number with the binary point
at the left edge of the field. This value is calculated by at the left edge of the field. This value is calculated by
dividing the difference between number of packets lost and Packets dividing the difference between number of packets lost and Packets
lost in Bursts by the difference between Packets Expected and lost in Bursts by the difference between Packets Expected and
Total Packets expected in Bursts as follows: Total Packets expected in Bursts, multiplying the result of the
division by 7FFF, with the maximum value 7FFF, and taking the
integer part as follows:
(number of packets lost - Packets Lost in Bursts) / (Packets (number of packets lost - Packets Lost in Bursts) / (Packets
Expected - Total Packets expected in Bursts) Expected - Total Packets expected in Bursts)
where "number of packets lost" is obtained from standard RTCP where "number of packets lost" is obtained from standard RTCP
[RFC3550] and Packets Expected is calculated as the difference [RFC3550] and Packets Expected is calculated as the difference
between "extended last sequence number" and "extended first between "extended last sequence number" and "extended first
sequence number" (Interval or Cumulative) provided in the sequence number" (Interval or Cumulative) provided in the
Measurement Identity and Information block [RFC6776]. Measurement Identity and Information block [RFC6776].
If the measurement is unavailable, the value 0x8000 MUST be
reported.
Note that if the metric is to be calculated on an Interval basis, Note that if the metric is to be calculated on an Interval basis,
a difference must be taken between the current and preceding a difference must be taken between the current and preceding
values of "cumulative number of packets lost" in RTCP, to obtain values of "cumulative number of packets lost" in RTCP, to obtain
the "number of packets lost" for the reporting interval. the "number of packets lost" for the reporting interval.
Burst Duration Mean:16bits Burst Duration Mean:16bits
The mean burst duration is obtained as the quotient: The mean burst duration is obtained as the quotient:
mean = Sum of Burst Durations / Number of Bursts mean = Sum of Burst Durations / Number of Bursts
where "Sum of Burst Durations" and "Number of Bursts" is obtained where "Sum of Burst Durations" and "Number of Bursts" is obtained
from the RTCP XR Burst/Gap Loss Block [BGLOSS]. from the RTCP XR Burst/Gap Loss Block [BGLOSS].
If the measurement is unavailable, the value 0xFFFF MUST be
reported.
Burst Duration Variance:16bits Burst Duration Variance:16bits
The variance of the burst duration is obtained using the standard The variance of the burst duration is obtained using the standard
result: result:
var = ( Sum of Squares of Burst Durations - Number of Bursts * var = ( Sum of Squares of Burst Durations - Number of Bursts *
mean^2 ) / (Number of Bursts - 1) mean^2 ) / (Number of Bursts - 1)
where "Sum of Squares of Burst Durations" and "Number of Bursts"is where "Sum of Squares of Burst Durations" and "Number of Bursts"is
obtained from the RTCP XR Burst/Gap Loss Block [BGLOSS]. obtained from the RTCP XR Burst/Gap Loss Block [BGLOSS].
If the measurement is unavailable, the value 0xFFFF MUST be
reported.
3.2. Burst/Gap Discard Summary Statistics Metrics Block 3.2. Burst/Gap Discard Summary Statistics Metrics Block
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
Identity block [RFC6776] (which MUST be present in the same RTCP Identity block [RFC6776] (which MUST be present in the same RTCP
packet as the Burst/Gap Discard Summary Statistics block) . packet as the Burst/Gap Discard Summary Statistics block) .
These metrics provide information relevant to statistical parameters, These metrics provide information relevant to statistical parameters,
including burst discard rate, gap discard rate and are calculated at including burst discard rate, gap discard rate and are calculated at
the receiving end of the RTP stream using burst gap discard metrics the receiving end of the RTP stream using burst gap discard metrics
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SSRC of Source: 32 bits SSRC of Source: 32 bits
As defined in Section 4.1 of RFC3611 [RFC3611]. As defined in Section 4.1 of RFC3611 [RFC3611].
Burst Discard Rate: 16 bits Burst Discard Rate: 16 bits
The fraction of packets discarded during bursts since the The fraction of packets discarded during bursts since the
beginning of reception, expressed as a fixed point number with the beginning of reception, expressed as a fixed point number with the
binary point at the left edge of the field. This value is binary point at the left edge of the field. This value is
calculated by dividing Packets Discarded in Bursts by Total calculated by dividing Packets Discarded in Bursts by Total
Packets expected in Bursts as follows: Packets expected in Bursts, multiplying the result of the division
by 7FFF, with the maximum value 7FFF, and taking the integer part
as follows:
Packets Discarded in Bursts / Total Packets expected in Bursts Packets Discarded in Bursts / Total Packets expected in Bursts
If the measurement is unavailable, the value 0x8000 MUST be
reported.
Gap Discard Rate: 16 bits Gap Discard Rate: 16 bits
The fraction of packets discarded during gaps since the beginning The fraction of packets discarded during gaps since the beginning
of reception expressed as a fixed point number with the binary of reception expressed as a fixed point number with the binary
point at the left edge of the field. This value is calculated by point at the left edge of the field. This value is calculated by
dividing the difference between number of packets discarded and dividing the difference between number of packets discarded and
Packets Discarded in Bursts by the difference between Packets Packets Discarded in Bursts by the difference between Packets
Expected and Total Packets expected in Bursts as follows: Expected and Total Packets expected in Bursts, multiplying the
result of the division by 7FFF, with the maximum value 7FFF, and
taking the integer part as follows:
(number of packets discarded - Packets Discarded in Bursts) / (number of packets discarded - Packets Discarded in Bursts) /
(Packets Expected - Total Packets expected in Bursts) (Packets Expected - Total Packets expected in Bursts)
where "number of packets discarded" is obtained from the RTCP XR where "number of packets discarded" is obtained from the RTCP XR
Discard Count Block [DISCARD] and filled with the sum of packets Discard Count Block [DISCARD] and filled with the sum of packets
discarded due to early arrival (DT=1) and packets discarded due to discarded due to early arrival (DT=1) and packets discarded due to
late arrival(DT=2) and Packets Expected is calculated as the late arrival(DT=2) and Packets Expected is calculated as the
difference between "extended last sequence number" and "extended difference between "extended last sequence number" and "extended
first sequence number" (Interval or Cumulative) provided in the first sequence number" (Interval or Cumulative) provided in the
Measurement Information block [RFC6776]. In order for the Burst/ Measurement Information block [RFC6776]. In order for the Burst/
Gap Discard Summary Statistics Block to be meaningful, 2 instances Gap Discard Summary Statistics Block to be meaningful, 2 instances
of the Discard Count block with DT=1 and DT=2 MUST be included in of the Discard Count block with DT=1 and DT=2 MUST be included in
the same RTCP XR packet as the Burst/Gap Discard Summary the same RTCP XR packet as the Burst/Gap Discard Summary
Statistics Block. Statistics Block.
If the measurement is unavailable, the value 0x8000 MUST be
reported.
4. Application Level Metrics 4. Application Level Metrics
4.1. Frame Impairment Statistics Summary Metrics Block 4.1. Frame Impairment Statistics Summary Metrics Block
This block reports statistics on which frame type were affected This block reports statistics on which frame type were affected
beyond the information carried in the Statistics Summary Report Block beyond the information carried in the Statistics Summary Report Block
RTCP packet specified in the section 4.6 of RFC 3611 [RFC3611]. RTCP packet specified in the section 4.6 of RFC 3611 [RFC3611].
Information is measured at the receiving end of the RTP stream and Information is measured at the receiving end of the RTP stream and
recorded about the number of frames received, lost frames, duplicated recorded about the number of frames received, lost frames, duplicated
frames and lost partial frames. Such information can be useful for frames and lost partial frames. Such information can be useful for
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4.1.1. Report Block Structure 4.1.1. Report Block Structure
0 1 2 3 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 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=FISS |T| Reserved | block length | | BT=FISS |T| Reserved | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source | | SSRC of Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Begin_seq | End_seq | | begin_seq | end_seq |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of frames received | | Number of frames received |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Discarded_frames | | Discarded_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dup_frames | | Dup_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Lost_full_frames | | Full_lost_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Lost_partial_frames | | Partial_lost_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4.1.2. Definition of Fields in Frame Impairment Summary Statistics 4.1.2. Definition of Fields in Frame Impairment Summary Statistics
Block Block
Block type (BT): 8 bits Block type (BT): 8 bits
Frame Impairment Statistics Summary Block is identified by the Frame Impairment Statistics Summary Block is identified by the
constant <FISS>. constant <FISS>.
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Block Length: 16 bits Block Length: 16 bits
The constant 7, in accordance with the definition of this field in The constant 7, in accordance with the definition of this field in
Section 3 of RFC 3611 [RFC3611]. Section 3 of RFC 3611 [RFC3611].
SSRC of Source: 32 bits SSRC of Source: 32 bits
As defined in Section 4.1 of RFC3611 [RFC3611]. As defined in Section 4.1 of RFC3611 [RFC3611].
Begin_seq: 16 bits begin_seq: 16 bits
As defined in Section 4.1 of RFC 3611 [RFC3611]. As defined in Section 4.1 of RFC 3611 [RFC3611].
end_seq: 16 bits end_seq: 16 bits
As defined in Section 4.1 of RFC 3611 [RFC3611]. As defined in Section 4.1 of RFC 3611 [RFC3611].
Number of frames received:32 bits Number of frames received:32 bits
A count of the number of frames received in the above sequence A count of the number of frames received in the above sequence
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Number of discarded frames (discarded_frames): 32 bits Number of discarded frames (discarded_frames): 32 bits
Number of frames discarded in the above sequence number interval. Number of frames discarded in the above sequence number interval.
Number of duplicate frames (dup_frames): 32 bits Number of duplicate frames (dup_frames): 32 bits
Number of duplicate frames received in the above sequence number Number of duplicate frames received in the above sequence number
interval. interval.
Number of full frames lost (lost_full_frames): 32 bits Number of full lost frames (full_lost_frames): 32 bits
If one frame is completely lost, this frame is regarded as one A frame is either split across multiple packets or carried in only
lost full frame. The lost_full_frames is equivalent to the number one packet.If the whole frame or all the packets of the frame is
of full frames lost in the above sequence number interval. lost, this frame is regarded as one full lost frame. The
full_lost-frames can be inferred from packet(s) that comprise the
frame. The full lost_ frames is equivalent to the number of full
lost frames in the above sequence number interval.
Number of partial frames lost (lost_partial_frames): 32 bits Number of partial lost frames (partial_lost_frames): 32 bits
If one frame is partially lost, this frame is regarded as one lost When a frame is split across multiple packets and some packets of
fractional frame. The value of the lost_partial_frames field is the frame are lost, this frame is regarded as one partially lost
equivalent to the number of partial frames lost in the above frame. The partial_lost-frames can be inferred from packets that
comprise the frame. The value of the partial_lost_frames field is
equivalent to the number of partial lost frames in the above
sequence number interval. sequence number interval.
5. SDP Signaling 5. SDP Signaling
RFC 3611 defines the use of SDP (Session Description Protocol) RFC 3611 defines the use of SDP (Session Description Protocol)
[RFC4566] for signaling the use of XR blocks. However XR blocks MAY [RFC4566] for signaling the use of XR blocks. However XR blocks MAY
be used without prior signaling (see section 5 of RFC3611). be used without prior signaling (see section 5 of RFC3611).
5.1. SDP rtcp-xr-attrib Attribute Extension 5.1. 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 Section 5.1 of RFC 3611 by providing three additional values of in Section 5.1 of RFC 3611 by providing three additional values of
"xr-format" to signal the use of the report block defined in this "xr-format" to signal the use of the report block defined in this
document. document.
xr-format = / burst-gap-loss-stat xr-format = / xr-bglss-block
/ burst-gap-discard-stat / xr-bgdss-block
/ frame-impairment-stat / xr-fiss-block
Burst-gap-loss-stat ="burst gap loss summary statistics" xr-bglss-block=" burst-gap-loss-stat "
Burst-gap-discard-stat="burst gap discard summary statistics" xr-bgdss-block =" burst-gap-discard-stat "
Frame-impairment-stat="frame impairment summary statistics" xr-fiss-block=" frame-impairment-stat "
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] for unilateral "rtcp-xr" attribute parameters defined in [RFC3611] for unilateral "rtcp-xr" attribute parameters
applies. For detailed usage of Offer/Answer for unilateral applies. For detailed usage of Offer/Answer for unilateral
parameter, refer to section 5.2 of [RFC3611]. parameter, refer to section 5.2 of [RFC3611].
6. IANA Considerations 6. IANA Considerations
skipping to change at page 13, line 48 skipping to change at page 14, line 23
7. Security Considerations 7. Security Considerations
The new RTCP XR report blocks proposed in this document introduces no The new RTCP XR report blocks proposed in this document introduces no
new security considerations beyond those described in RFC 3611. new security considerations beyond those described in RFC 3611.
8. Acknowledgements 8. Acknowledgements
The authors would like to thank Bill Ver Steeg, David R Oran, Ali The authors would like to thank Bill Ver Steeg, David R Oran, Ali
Begen, Colin Perkins, Roni Even, Youqing Yang, Wenxiao Yu, Yinliang Begen, Colin Perkins, Roni Even, Youqing Yang, Wenxiao Yu, Yinliang
Hu, Jing Zhao, Ray van Brandenburg, Claire Bi, Dan Romascanu for Hu, Jing Zhao, Ray van Brandenburg, Claire Bi, Dan Romascanu , Morton
their valuable comments and suggestions on this document. Jr., Alfred for their valuable comments and suggestions on this
document.
9. References 9. References
9.1. Normative References 9.1. Normative References
[BGDISCARD] [BGDISCARD]
Clark, A., Huang, R., and W. Wu, "RTP Control Clark, A., Huang, R., and W. Wu, "RTP Control
Protocol(RTCP) Extended Report (XR) Block for Burst/Gap Protocol(RTCP) Extended Report (XR) Block for Burst/Gap
Discard metric Reporting", Discard metric Reporting",
draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 (work in draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 (work in
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September 2012. September 2012.
[RFC6792] Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures [RFC6792] Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures
for RTP", RFC 6792, November 2012. for RTP", RFC 6792, November 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-summary-stat-06 A.1. draft-ietf-xrblock-rtcp-xr-summary-stat-07
The following are the major changes compared to 05:
o Add comments raised in PM-DIR review by Al.
A.2. draft-ietf-xrblock-rtcp-xr-summary-stat-06
The following are the major changes compared to 05: The following are the major changes compared to 05:
o Move RFC6709 to informative reference. o Move RFC6709 to informative reference.
A.2. draft-ietf-xrblock-rtcp-xr-summary-stat-05 A.3. draft-ietf-xrblock-rtcp-xr-summary-stat-05
The following are the major changes compared to 04: The following are the major changes compared to 04:
o Editorial changes to get in line with Delay and Burst Gap related o Editorial changes to get in line with Delay and Burst Gap related
drafts. drafts.
Authors' Addresses Authors' Addresses
Glen Zorn (editor) Glen Zorn (editor)
Network Zen Network Zen
227/358 Thanon Sanphawut 227/358 Thanon Sanphawut
 End of changes. 36 change blocks. 
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