draft-ietf-xrblock-rtcp-xr-summary-stat-00.txt   draft-ietf-xrblock-rtcp-xr-summary-stat-01.txt 
Network Working Group G. Zorn Network Working Group G. Zorn
Internet-Draft Network Zen Internet-Draft Network Zen
Intended status: Standards Track R. Schott Intended status: Standards Track R. Schott
Expires: January 31, 2013 Deutsche Telekom Expires: April 18, 2013 Deutsche Telekom
Q. Wu Q. Wu
R. Huang R. Huang
Huawei Huawei
July 30, 2012 October 15, 2012
RTCP XR for Summary Statistics Metrics Reporting RTP Control Protocol (RTCP) Extended Report (XR) Block for Summary
draft-ietf-xrblock-rtcp-xr-summary-stat-00 Statistics Metrics Reporting
draft-ietf-xrblock-rtcp-xr-summary-stat-01
Abstract Abstract
This document defines three RTCP XR Report Blocks and associated SDP This document defines three RTP Control Protcol (RTCP) Extended
parameters that allows the reporting of loss, duplication and discard Report (XR) Blocks and associated SDP parameters that allows the
summary statistics metrics for use in a range of RTP applications. reporting of loss, duplication and discard summary statistics metrics
for use in a range of RTP applications.
Status of this Memo Status of this Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 31, 2013. This Internet-Draft will expire on April 18, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 2, line 12 skipping to change at page 2, line 14
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3
3. Transport Layer Metrics . . . . . . . . . . . . . . . . . . . 4 3. Transport Related End System Metrics . . . . . . . . . . . . . 4
3.1. Burst/Gap Loss Summary Statistics Block . . . . . . . . . 4 3.1. Burst/Gap Loss Summary Statistics Block . . . . . . . . . 4
3.1.1. Report Block Structure . . . . . . . . . . . . . . . . 4 3.1.1. Report Block Structure . . . . . . . . . . . . . . . . 4
3.1.2. Definition of Fields in Loss Summary Statistics 3.1.2. Definition of Fields in Loss Summary Statistics
Block . . . . . . . . . . . . . . . . . . . . . . . . 4 Block . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Burst/Gap Discard Summary Statistics Block . . . . . . . . 6 3.2. Burst/Gap Discard Summary Statistics Block . . . . . . . . 6
3.2.1. Report Block Structure . . . . . . . . . . . . . . . . 6 3.2.1. Report Block Structure . . . . . . . . . . . . . . . . 6
3.2.2. Definition of Fields in Discard Summary Statistics 3.2.2. Definition of Fields in Discard Summary Statistics
Block . . . . . . . . . . . . . . . . . . . . . . . . 7 Block . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Application Layer Metrics . . . . . . . . . . . . . . . . . . 8 4. Application Level Metrics . . . . . . . . . . . . . . . . . . 8
4.1. Frame Impairment Statistics Summary Block . . . . . . . . 8 4.1. Frame Impairment Statistics Summary Block . . . . . . . . 8
4.1.1. Report Block Structure . . . . . . . . . . . . . . . . 9 4.1.1. Report Block Structure . . . . . . . . . . . . . . . . 9
4.1.2. Definition of Fields in Frame Impairment Summary 4.1.2. Definition of Fields in Frame Impairment Summary
Statistics Block . . . . . . . . . . . . . . . . . . . 9 Statistics Block . . . . . . . . . . . . . . . . . . . 9
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 11 5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 11
5.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 11 6.1. New RTCP XR Block Type values . . . . . . . . . . . . . . 11
6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 12 6.2. New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 12
6.3. Contact information for registrations . . . . . . . . . . 12 6.3. Contact information for registrations . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12 7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . . 12 9.1. Normative References . . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . . 13 9.2. Informative References . . . . . . . . . . . . . . . . . . 13
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 13 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13 A.1. draft-ietf-xrblock-rtcp-xr-summary-stat-01 . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction 1. Introduction
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.
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 layer metrics mean and variance and belong to the class of transport related end
defined in [MONARCH]. These two blocks are intended to be used in system metrics defined in [MONARCH]. These two blocks are intended
conjunction with information from the Burst Gap Loss metric block or to be used in conjunction with information from the Burst Gap Loss
burst gap discard metric block, and on which these two block metric block or Burst Gap Discard metric block, and on which these
therefore depends. However the metrics in the Burst Gap Loss block two block therefore depends. However the metrics in the Burst Gap
or burst gap discard block may be used independently of the metrics Loss block or Burst Gap Discard metric block may be used
defined in the first two blocks. independently of the metrics defined in the first two blocks.These
two blocks reflect transient IP problem that affect user experience
and can be used to influence sender strategies to mitigate the
problem.
To form an accurate assessment of user quality of experience, it is To form an accurate assessment of user quality of experience, it is
therefore necessary to know not just overall rates of packet loss/ therefore necessary to know not just overall rates of packet loss/
discard, but also which frame type were affected. The third block discard, but also which frame type were affected. The third block
supports the reporting of detailed statistics for each frame type, supports the reporting of detailed statistics for each frame type,
including the number of received, lost and discarded of each frame including the number of received, lost and discarded of each frame
type in the Group of Pictures and additional data allowing the type in the Group of Pictures (GOP) and additional data allowing the
calculation of statistical parameters (e.g.,the proportion of each calculation of statistical parameters (e.g.,the proportion of each
frame type impaired by packet loss and discard). The metrics defined frame type impaired by packet loss and discard). The metrics defined
in this block belong to the class of application layer metrics in this block belong to the class of application layer metrics
defined in [MONARCH]. defined in [MONARCH].
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 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 compose of Picture types used in the different video algorithms compose of
the key-frame and the Derivation frame. Key-frame is also called the key-frame and the Derived frame. Key-frame is also called a
a reference frame and used as a reference for predicting other reference frame and used as a reference for predicting other
pictures. It is coded without prediction from other pictures. pictures. It is coded without prediction from other pictures.
The Derivation frame is derived from Key-frame using prediction The Derived frame is derived from Key-frame using prediction from
from the reference frame. the reference frame.
3. Transport Layer Metrics 3. Transport Related End System Metrics
3.1. Burst/Gap Loss Summary Statistics Block 3.1. Burst/Gap Loss Summary Statistics 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 [MEASIDENT] (which MUST be present in the same RTCP Information block [MEASIDENT] (which MUST be present in the same RTCP
packet as the Burst/Gap Loss block) and also with the metric packet as the Burst/Gap Loss block) and also with the metric
"cumulative number of packets lost" provided in standard RTCP "cumulative number of packets lost" provided in standard RTCP
[RFC3550]. [RFC3550].
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including burst loss rate, gap loss rate, burst duration mean, burst including burst loss rate, gap loss rate, burst duration mean, burst
duration variance and are calculated using burst gap loss metrics duration variance and are calculated using burst gap loss metrics
defined in [BGLOSS] and other information which is sent together with defined in [BGLOSS] and other information which is sent together with
this report block. this report block.
3.1.1. Report Block Structure 3.1.1. 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=BGLSS | I | rsv. | block length | | BT=BGLSS | I | Reserved | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source | | SSRC of Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Burst Loss Rate | Gap Loss Rate | | Burst Loss Rate | Gap Loss Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Burst duration Mean | Burst duration Variance | | Burst duration Mean | Burst duration Variance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3.1.2. Definition of Fields in Loss Summary Statistics Block 3.1.2. Definition of Fields in Loss Summary Statistics Block
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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 including burst discard rate, gap discard rate and are calculated
using burst gap loss metrics defined in [BGDISCARD] and other using burst gap loss metrics defined in [BGDISCARD] and other
information which is sent together with this report block. information which is sent together with this report block.
3.2.1. Report Block Structure 3.2.1. 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=BGDSS | I | Rsv. | block length | | BT=BGDSS | I | Reserved | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of Source | | SSRC of Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Burst Discard Rate | Gap Discard Rate | | Burst Discard Rate | Gap Discard Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3.2.2. Definition of Fields in Discard Summary Statistics Block 3.2.2. Definition of Fields in Discard Summary Statistics Block
Block Type (BT): 8 bits Block Type (BT): 8 bits
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constant <BGDSS>. constant <BGDSS>.
Reserved: 8 bits Reserved: 8 bits
This field is reserved for future definition. In the absence of This field is reserved for future definition. In the absence of
such a definition, the bits in this field MUST be set to zero and such a definition, the bits in this field MUST be set to zero and
MUST be ignored by the receiver. MUST be ignored by the receiver.
Interval Metric flag (I): 2 bits Interval Metric flag (I): 2 bits
This field is used to indicate whether the metrics block is an This field is used to indicate whether the Burst/Gap Discard
Interval or a Cumulative report, Summary Statistics metrics are Sampled, Interval or Cumulative
metrics, that is, whether the reported values applies to the most
recent measurement interval duration between successive metrics
reports (I=10) (the Interval Duration) or to the accumulation
period characteristic of cumulative measurements (I=11) (the
Cumulative Duration) or is a sampled instantaneous value (I=01)
(Sampled Value).
Reserved: 6 bits Reserved: 6 bits
This field is used to indicate whether the Burst/Gap Discard This field is used to indicate whether the Burst/Gap Discard
Summary Statistics metrics are Sampled, Interval or Cumulative Summary Statistics metrics are Sampled, Interval or Cumulative
metrics, that is, whether the reported values applies to the most metrics, that is, whether the reported values applies to the most
recent measurement interval duration between successive metrics recent measurement interval duration between successive metrics
reports (I=10) (the Interval Duration) or to the accumulation reports (I=10) (the Interval Duration) or to the accumulation
period characteristic of cumulative measurements (I=11) (the period characteristic of cumulative measurements (I=11) (the
Cumulative Duration) or is a sampled instantaneous value (I=01) Cumulative Duration) or is a sampled instantaneous value (I=01)
(Sampled Value). (Sampled Value).
block length: 16 bits Block Length: 16 bits
The constant 2, in accordance with the definition of this field in The constant 2, 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].
Burst Discard Rate: 16 bits Burst Discard Rate: 16 bits
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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 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 Block [DISCARD] and Packets Expected is calculated as the Discard Count Block [DISCARD] and Packets Expected is calculated
difference between "extended last sequence number" and "extended as the difference between "extended last sequence number" and
first sequence number" (Interval or Cumulative) provided in the "extended first sequence number" (Interval or Cumulative) provided
Measurement Information block [MEASIDENT]. in the Measurement Information block [MEASIDENT]. In order for
Burst/Gap Discard Summary Statistics Block to be meaningful either
1. a single instance of the Discard Count block with DT=3 or 2.
exactly 2 instances of the Discard Count block with DT=1 and DT=2,
respectively MUST be included in the same RTCP compound packet.
In this case,if Discard Count (DT=3) Block is received, "the
number of packet discarded"is be filled with the number of packets
discarded due to both early and late arrival(DT=3); if Discard
Count (DT=3) is not received, "the number of packet discarded" is
calculated as the sum of packet discards due to early arrival
(DT=1)and packet discards due to late arrival(DT=2).
4. Application Layer Metrics 4. Application Level Metrics
4.1. Frame Impairment Statistics Summary Block 4.1. Frame Impairment Statistics Summary 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 recorded about umber of frames received, lost frames Information is recorded about umber of frames received, lost frames
,duplicated frames, lost partial frames. Such information can be ,duplicated frames, lost partial frames. Such information can be
useful for network management and video quality monitoring. useful for network management and video quality monitoring.
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| rsv. | block length | | BT=FISS |I| 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| dicarded_frames | | Discarded_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| dup_frames | | Dup_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| lost_full_frames | | Lost_full_frames |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| lost_partial_frames | | Lost_partial_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>.
Picture type indicator (T): 1 bit Picture type indicator (I): 1 bit
Picture types used in the different video algorithms compose of Picture types used in the different video algorithms compose of
key-frame and derivation frame. This field is used to indicate key-frame and derivation frame. This field is used to indicate
the frame type to be reported. Bits set to 0 if the lost_frames the frame type to be reported. Bits set to 0 if the lost_frames
field or dup_frames field contain a key_frame report or reference field or dup_frames field contain a key_frame report or reference
frame report, 1 if the lost_frames field and dup_frames field frame report, 1 if the lost_frames field and dup_frames field
contain other derivation frame report. Note that if both the key contain other derivation frame report. Note that if both the key
frame report and derivation frame are sent, they should be sent in frame report and derivation frame are sent, they should be sent in
the same RTCP compound packet using two XR Blocks. the same RTCP compound packet using two XR Blocks.
Rsv.: 7 bits Reserved: 7 bits
This field is reserved for future definition. In the absence of This field is reserved for future definition. In the absence of
such a definition, the bits in this field MUST be set to zero and such a definition, the bits in this field MUST be set to zero and
MUST be ignored by the receiver. MUST be ignored by the receiver.
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:32bits Number of frames received:32bits
A count of the number of frames received, estimated if necessary. A count of the number of frames received, estimated if necessary.
If no frames have been received then this count shall be set to If no frames have been received then this count shall be set to
Zero. Zero.
lost_full_frames: 32 bits Number of discarded frames (discarded_frames): 32 bits
If one frame is completely lost, this frame is regarded as one
lost full_frame. The lost_full_frames is equivalent to the number
of lost_full_frames in the above sequence number interval.
discarded_frames: 32 bits
Number of frames discarded in the above sequence number interval. Number of frames discarded in the above sequence number interval.
dup_frames: 32 bits Number of duplicated frames (dup_frames): 32 bits
Number of duplicated frames in the above sequence number interval. Number of duplicated frames in the above sequence number interval.
lost_partial_frames: 32 bits Number of full frames lost (lost_full_frames): 32 bits
If one frame is completely lost, this frame is regarded as one
lost full_frame. The lost_full_frames is equivalent to the number
of full frames lost in the above sequence number interval.
Number of partial frames lost (lost_partial_frames): 32 bits
If one frame is partially lost, this frame is regarded as one lost If one frame is partially lost, this frame is regarded as one lost
fractional frame. The lost_partial_frames is equivalent to the fractional frame. The lost_partial_frames is equivalent to the
number of lost_partial_frames in the above sequence number number of partial_frames lost in the above sequence number
interval. interval.
5. SDP Signaling 5. SDP Signaling
[RFC3611] defines the use of SDP (Session Description Protocol) [RFC3611] defines the use of SDP (Session Description Protocol)
[RFC4566] for signaling the use of XR blocks. XR blocks MAY be used [RFC4566] for signaling the use of XR blocks. XR blocks MAY be used
without prior signaling. without prior signaling.
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 [RFC3611] by providing three additional value of "xr-format" to in [RFC3611] by providing three additional value of "xr-format" to
signal the use of the report block defined in this document. signal the use of the report block defined in this document.
rtcp-xr-attrib = "a=rtcp-xr:" xr-format = / burst-gap-loss-stat
[xr-format *(SP xr-format)] CRLF / burst-gap-discard-stat
xr-format = / frame-impairment-stat
/ burst-gap-loss-stat Burst-gap-loss-stat ="burst gap loss summary statistics"
/ burst-gap-discard-stat Burst-gap-discard-stat="burst gap discard summary statistics"
/ frame-impairment-stat Frame-impairment-stat="frame impairment summary statistics"
Refer to Section 5.1 of RFC 3611 [RFC3611] for a detailed description 5.2. Offer/Answer Usage
and the full syntax of the "rtcp-xr" attribute.
When SDP is used in offer-answer context, the SDP Offer/Answer usage
defined in [RFC3611] applies.
6. IANA Considerations 6. IANA Considerations
New block types for RTCP XR are subject to IANA registration. For New block types for RTCP XR are subject to IANA registration. For
general guidelines on IANA considerations for RTCP XR, refer general guidelines on IANA considerations for RTCP XR, refer
to[RFC3611] . to[RFC3611] .
6.1. New RTCP XR Block Type values 6.1. New RTCP XR Block Type values
This document assigns three new block type value in the RTCP XR Block This document assigns three new block type value in the RTCP XR Block
Type Registry: Type Registry:
Name: BGLSS Name: BGLSS
Long Name: Burst/Gap Loss Summsary Statistics Block Long Name: Burst/Gap Loss Summsary Statistics Block
Value <BGLSS> Value <BGLSS>
Reference: Section 5.1 Reference: Section 3.1
Name: BGDSS Name: BGDSS
Long Name: Burst/Gap Discard Summary Statistics Block Long Name: Burst/Gap Discard Summary Statistics Block
Value <BGDSS> Value <BGDSS>
Reference: Section 5.2 Reference: Section 3.2
Name: FISS Name: FISS
Long Name: Frame Impairment Statistics Summary Long Name: Frame Impairment Statistics Summary
Value <FISS> Value <FISS>
Reference: Section 6.1 Reference: Section 4.1
6.2. New RTCP XR SDP Parameters 6.2. New RTCP XR SDP Parameters
This document also registers three new SDP [RFC4566] parameters for This document also registers three new SDP [RFC4566] parameters for
the "rtcp-xr" attribute in the RTCP XR SDP Parameters Registry: the "rtcp-xr" attribute in the RTCP XR SDP Parameters Registry:
* " burst-gap-loss-stat " * " burst-gap-loss-stat "
* " burst-gap-discard-stat " * " burst-gap-discard-stat "
* " frame-impairment-stat " * " frame-impairment-stat "
skipping to change at page 13, line 13 skipping to change at page 13, line 28
November 2003. November 2003.
[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006. Description Protocol", RFC 4566, July 2006.
9.2. Informative References 9.2. Informative References
[BGDISCARD] [BGDISCARD]
Hunt, G., "RTCP XR Report Block for Burst Gap Discard Hunt, G., "RTCP XR Report Block for Burst Gap Discard
metric Reporting", metric Reporting",
ID draft-ietf-xrblock-rtcp-xr-burst-gap-discard-02, ID draft-ietf-xrblock-rtcp-xr-burst-gap-discard-09,
January 2012. October 2012.
[BGLOSS] Hunt, G., "RTCP XR Report Block for Burst Gap Loss metric [BGLOSS] Hunt, G., "RTCP XR Report Block for Burst Gap Loss metric
Reporting", Reporting",
ID draft-ietf-xrblock-rtcp-xr-burst-gap-loss-01, ID draft-ietf-xrblock-rtcp-xr-burst-gap-loss-04,
January 2012. October 2012.
[DISCARD] Hunt, G., "RTCP XR Report Block for Discard metric [DISCARD] Hunt, G., "RTCP XR Report Block for Discard metric
Reporting", ID draft-ietf-xrblock-rtcp-xr-discard-01, Reporting", ID draft-ietf-xrblock-rtcp-xr-discard-09,
December 2011. October 2012.
[MEASIDENT] [MEASIDENT]
Wu, Q., "Measurement Identity and information Reporting Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block", using SDES item and XR Block",
ID draft-ietf-xrblock-rtcp-xr-meas-identity-02, ID draft-ietf-xrblock-rtcp-xr-meas-identity-10,
January 2012. August 2012.
[MONARCH] Wu, Q., "Monitoring Architecture for RTP", [MONARCH] Wu, Q., "Monitoring Architecture for RTP",
ID draft-ietf-avtcore-monarch-10, February 2012. ID draft-ietf-avtcore-monarch-22, September 2012.
[RFC6390] Clark, A., "Framework for Performance Metric Development", [RFC6390] Clark, A., "Framework for Performance Metric Development",
RFC 6390, January 2011. RFC 6390, January 2011.
Appendix A. Change Log Appendix A. Change Log
This document is separated from Note to the RFC-Editor: please remove this section prior to
draft-wu-xrblock-rtcp-xr-quality-monitoring-01 with a few editorial publication as an RFC.
changes and focuses on loss,duplication, discard, and summary
statistics metrics. A.1. draft-ietf-xrblock-rtcp-xr-summary-stat-01
The following are the major changes compared to 00:
o Outdated Reference update
o Add text to clarify the selection of discard count based on
discard count metric block.
o Revise Interval metric flag defintion for consistency.
o SDP text restructure
o Other editorial changes based on comments on the list.
Authors' Addresses Authors' Addresses
Glen Zorn Glen Zorn
Network Zen Network Zen
77/440 Soi Phoomjit, Rama IV Road 77/440 Soi Phoomjit, Rama IV Road
Phra Khanong, Khlong Toie Phra Khanong, Khlong Toie
Bangkok 10110 Bangkok 10110
Thailand Thailand
 End of changes. 47 change blocks. 
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