draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11.txt   draft-ietf-xrblock-rtcp-xr-burst-gap-discard-12.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 R. Huang Intended status: Standards Track R. Huang
Expires: October 13, 2013 Q. Wu, Ed. Expires: October 14, 2013 Q. Wu, Ed.
Huawei Huawei
April 11, 2013 April 12, 2013
RTP Control Protocol(RTCP) Extended Report (XR) Block for Burst/Gap RTP Control Protocol(RTCP) Extended Report (XR) Block for Burst/Gap
Discard metric Reporting Discard metric Reporting
draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11.txt draft-ietf-xrblock-rtcp-xr-burst-gap-discard-12.txt
Abstract Abstract
This document defines an RTP Control Protocol(RTCP) Extended Report This document defines an RTP Control Protocol(RTCP) Extended Report
(XR) Block that allows the reporting of Burst and Gap Discard metrics (XR) Block that allows the reporting of Burst and Gap Discard metrics
for use in a range of RTP applications. for use in a range of RTP applications.
Status of this Memo Status of this Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 13, 2013. This Internet-Draft will expire on October 14, 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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6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 12 6.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 12
6.3. Contact information for registrations . . . . . . . . . . 12 6.3. Contact information for registrations . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13 7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10.1. Normative References . . . . . . . . . . . . . . . . . . . 16 10.1. Normative References . . . . . . . . . . . . . . . . . . . 16
10.2. Informative References . . . . . . . . . . . . . . . . . . 16 10.2. Informative References . . . . . . . . . . . . . . . . . . 16
Appendix A. Metrics represented using RFC6390 Template . . . . . 17 Appendix A. Metrics represented using RFC6390 Template . . . . . 17
Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 20 Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 20
B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11 . . . . . 20 B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-12 . . . . . 20
B.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-10 . . . . . 20 B.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11 . . . . . 20
B.3. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-09 . . . . . 20 B.3. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-10 . . . . . 20
B.4. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 . . . . . 20 B.4. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-09 . . . . . 20
B.5. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 . . . . . 20 B.5. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 . . . . . 20
B.6. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction 1. Introduction
1.1. Burst and Gap Discard Report Block 1.1. Burst and Gap Discard Report Block
This document defines a new block type to augment those defined in This document defines a new block type to augment those defined in
[RFC3611] for use in a range of RTP applications. The new block type [RFC3611] for use in a range of RTP applications. The new block type
supports the reporting of the proportion of packets discarded by the supports the reporting of the proportion of packets discarded by the
receiver due to jitter. The discards during discard bursts are receiver due to jitter. The discards during discard bursts are
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which discarded packets are infrequent and hence quality is which discarded packets are infrequent and hence quality is
generally acceptable. generally acceptable.
3. Burst/Gap Discard Block 3. Burst/Gap Discard Block
Metrics in this block report on Burst/Gap Discard in the stream Metrics in this block report on Burst/Gap Discard in the stream
arriving at the RTP system. The measurement of these metrics are arriving at the RTP system. The measurement of these metrics are
made at the receiving end of the RTP stream. Instances of this made at the receiving end of the RTP stream. Instances of this
Metrics Block refer by Synchronization source (SSRC) to the separate Metrics Block refer by Synchronization source (SSRC) to the separate
auxiliary Measurement Information block [RFC6776] which describes auxiliary Measurement Information block [RFC6776] which describes
measurement periods in use (see RFC6776 section 4.2). This Metrics measurement periods in use (see RFC6776 section 4.2).
Block relies on the measurement period in the Measurement Information
block indicating the span of the report and MUST be sent in the same This Metrics Block relies on the measurement period in the
compound RTCP packet as the measurement information block. If the Measurement Information block indicating the span of the report.
measurement period is not received in the same compound RTCP packet Senders MUST send this block in the same compound RTCP packet as the
as this Metrics Block, this Metrics Block MUST be discarded. measurement information block. Receivers MUST verify that the
measurement period is received in the same compound RTCP packet as
this Metrics Block. If not, this Metrics Block MUST be discarded.
3.1. Report Block Structure 3.1. Report Block Structure
Burst/Gap Discard metrics block Burst/Gap Discard metrics block
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=NBGD | I | resv. | block length = 3 | | BT=NBGD | I | resv. | block length = 3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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most recent measurement interval duration between successive most recent measurement interval duration between successive
metrics reports. metrics reports.
I=11: Cumulative Duration - the reported value applies to the I=11: Cumulative Duration - the reported value applies to the
accumulation period characteristic of cumulative measurements. accumulation period characteristic of cumulative measurements.
I=01: Sampled Value - the reported value is a sampled I=01: Sampled Value - the reported value is a sampled
instantaneous value. instantaneous value.
In this document, Burst/Gap Discard Metrics can only be measured In this document, Burst/Gap Discard Metrics can only be measured
over definite intervals, and cannot be sampled. Accordingly, the over definite intervals, and cannot be sampled. Also, the value
value I=01, indicating a sampled value, MUST NOT be sent, and MUST I=00 is reserved for future use. Senders MUST NOT use the values
be discarded when received. In addition, the value I=00 is I=00 or I=01. If a block is received with I=00 or I=01, the
reserved and also MUST NOT be sent, and MUST be discarded when receiver MUST discard the block.
received.
Reserved (resv): 6 bits Reserved (resv): 6 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 Burst/Gap discard block, the block length is equal to 3. The the Burst/Gap discard block, the block length is equal to 3. The
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value 0xFFFFFF MUST be reported. value 0xFFFFFF MUST be reported.
Reserved (resv): 8 bits Reserved (resv): 8 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).
3.3. Derived metrics based on reported metrics 3.3. Derived metrics based on reported metrics
The metrics described here are intended to be used in conjunction The metrics described here are intended to be used in conjunction
with information from the Measurement Information block [RFC6776] with information from the Measurement Information block [RFC6776] and
(which must be present in the same RTCP packet as the Burst/Gap also with the metric "number of packets discarded" provided in the
Discard block) and also with the metric "number of packets discarded" RTCP XR Discard Count Block [DISCARD]. The RTCP XR Discard Count
provided in the RTCP XR Discard Count Block [DISCARD]. The RTCP XR Block should be sent if the Burst/Gap Discard block is sent, but the
Discard Count Block should be sent if the Burst/Gap Discard block is converse does not apply.
sent, but the converse does not apply.
These metrics provide the following information relevant to These metrics provide the following information relevant to
statistical parameters, including: statistical parameters, including:
o The fraction of packets discarded during bursts (burst discard o The fraction of packets discarded during bursts (burst discard
rate in [SUMSTAT]), which can be calculated using the metric " rate in [SUMSTAT]), which can be calculated using the metric "
Packets Discarded in Bursts " and the metric " Total Packets Packets Discarded in Bursts " and the metric " Total Packets
expected in Bursts " provided in the Burst/Gap Discard metrics expected in Bursts " provided in the Burst/Gap Discard metrics
block. block.
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without prior signaling. without prior signaling.
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 [RFC3611] by providing an additional value of "xr-format" to in [RFC3611] by providing an additional value of "xr-format" to
signal the use of the report block defined in this document. signal the use of the report block defined in this document.
xr-format =/ xr-bgd-block xr-format =/ xr-bgd-block
xr-bgd-block = "burst-gap-dscrd" xr-bgd-block = "burst-gap-discard"
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 in Offer/Answer for unilateral applies. For detailed usage in 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
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This document assigns the block type value NBGD in the IANA " RTP This document assigns the block type value NBGD in the IANA " RTP
Control Protocol Extended Reports (RTCP XR) Block Type Registry " to Control Protocol Extended Reports (RTCP XR) Block Type Registry " to
the "Burst/Gap Discard Metrics Block". the "Burst/Gap Discard Metrics Block".
[Note to RFC Editor: please replace NBGD with the IANA provided RTCP [Note to RFC Editor: please replace NBGD with the IANA provided RTCP
XR block type for this block.] XR block type for this block.]
6.2. New RTCP XR SDP Parameter 6.2. New RTCP XR SDP Parameter
This document also registers a new parameter "burst-gap-dscrd" in the This document also registers a new parameter "burst-gap-discard" in
"RTP Control Protocol Extended Reports (RTCP XR) Session Description the "RTP Control Protocol Extended Reports (RTCP XR) Session
Protocol (SDP) Parameters Registry". Description Protocol (SDP) Parameters Registry".
6.3. Contact information for registrations 6.3. Contact information for registrations
The contact information for the registrations is: The contact information for the registrations is:
Qin Wu (sunseawq@huawei.com) Qin Wu (sunseawq@huawei.com)
101 Software Avenue, Yuhua District 101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012 Nanjing, Jiangsu 210012
China China
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* Method of Measurement or Calculation: See section 3.2, * Method of Measurement or Calculation: See section 3.2,
Threshold definition [RFCXXXX]. Threshold definition [RFCXXXX].
* Units of Measurement: See section 3.2, Threshold definition * Units of Measurement: See section 3.2, Threshold definition
[RFCXXXX]. [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 3, 1st paragraph [RFCXXXX]. section 3, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for * Measurement Timing: See section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag. Metric flag.
* Use and applications: See section 1.4 [RFCXXXX]. * Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611. * Reporting model: See RFC3611.
b. Packets discarded in bursts Metric b. Packets discarded in bursts Metric
* Metric Name: RTP Packets discarded in bursts * Metric Name: RTP Packets discarded in bursts
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* Method of Measurement or Calculation: See section 3.2, Packets * Method of Measurement or Calculation: See section 3.2, Packets
discarded in bursts definition [RFCXXXX]. discarded in bursts definition [RFCXXXX].
* Units of Measurement: See section 3.2, Packets discarded in * Units of Measurement: See section 3.2, Packets discarded in
bursts definition [RFCXXXX]. bursts definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 3, 1st paragraph [RFCXXXX]. section 3, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for * Measurement Timing: See section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag. Metric flag.
* Use and applications: See section 1.4 [RFCXXXX]. * Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611. * Reporting model: See RFC3611.
c. Total packets expected in bursts Metric c. Total packets expected in bursts Metric
* Metric Name: Total RTP packets expected in bursts * Metric Name: Total RTP packets expected in bursts
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* Method of Measurement or Calculation: See section 3.2, Total * Method of Measurement or Calculation: See section 3.2, Total
packets expected in bursts definition [RFCXXXX]. packets expected in bursts definition [RFCXXXX].
* Units of Measurement: See section 3.2, Total packets expected * Units of Measurement: See section 3.2, Total packets expected
in bursts definition [RFCXXXX]. in bursts definition [RFCXXXX].
* Measurement Point(s) with Potential Measurement Domain: See * Measurement Point(s) with Potential Measurement Domain: See
section 3, 1st paragraph [RFCXXXX]. section 3, 1st paragraph [RFCXXXX].
* Measurement Timing: See section 3, 1st paragraph [RFCXXXX] for * Measurement Timing: See section 3, 2nd paragraph [RFCXXXX] for
measurement timing and section 3.2 [RFCXXXX] for Interval measurement timing and section 3.2 [RFCXXXX] for Interval
Metric flag. Metric flag.
* Use and applications: See section 1.4 [RFCXXXX]. * Use and applications: See section 1.4 [RFCXXXX].
* Reporting model: See RFC3611. * Reporting model: See RFC3611.
Appendix B. Change Log 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.
B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11 B.1. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-12
The following are the major changes compared to previous version:
o Similar changes to Burst Gap loss draft to get in line with Burst
Gap Loss draft.
B.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-11
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o Similar changes to Burst Gap loss draft to address IESG review o Similar changes to Burst Gap loss draft to address IESG review
comments apply to this document. comments apply to this document.
B.2. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-10 B.3. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-10
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o Move RFC6709 as one informative reference. o Move RFC6709 as one informative reference.
B.3. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-09 B.4. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-09
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o Editorial changes based on comments received in WGLC. o Editorial changes based on comments received in WGLC.
B.4. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 B.5. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o SDP update based on SDP Directorate Review. o SDP update based on SDP Directorate Review.
o Add some texts to get consistent with RFC6798 and Delay draft. o Add some texts to get consistent with RFC6798 and Delay draft.
B.5. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06 B.6. draft-ietf-xrblock-rtcp-xr-burst-gap-discard-06
The following are the major changes compared to previous version: The following are the major changes compared to previous version:
o Outdated reference update. o Outdated reference update.
o Editorial changes based on comments that applied to PDV and Delay o Editorial changes based on comments that applied to PDV and Delay
drafts. drafts.
Authors' Addresses Authors' Addresses
 End of changes. 18 change blocks. 
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