draft-ietf-xrblock-rtcp-xr-meas-identity-04.txt   draft-ietf-xrblock-rtcp-xr-meas-identity-05.txt 
Audio/Video Transport Working Group G. Hunt Audio/Video Transport Working Group G. Hunt
Internet-Draft Unaffiliated Internet-Draft Unaffiliated
Intended status: Standards Track A. Clark Intended status: Standards Track A. Clark
Expires: October 12, 2012 Telchemy Expires: October 15, 2012 Telchemy
Q. Wu Q. Wu
Huawei Huawei
April 10, 2012 April 13, 2012
Measurement Identity and information Reporting using SDES item and XR Measurement Identity and information Reporting using SDES item and XR
Block Block
draft-ietf-xrblock-rtcp-xr-meas-identity-04.txt draft-ietf-xrblock-rtcp-xr-meas-identity-05.txt
Abstract Abstract
This document defines an RTCP SDES item and an RTCP XR Block carrying This document defines an RTP Control Protocol (RTCP) Source
parameters that identify and describe a measurement period, to which Description (SDES) item and an RTCP Extended Report (XR) Block
one or more other RTCP XR Report Blocks may refer. carrying parameters that identify and describe a measurement period,
to which one or more other RTCP XR Report Blocks may refer.
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 October 12, 2012. This Internet-Draft will expire on October 15, 2012.
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
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1.2. Performance Metrics Framework . . . . . . . . . . . . . . 4 1.2. Performance Metrics Framework . . . . . . . . . . . . . . 4
1.3. Applicability . . . . . . . . . . . . . . . . . . . . . . 4 1.3. Applicability . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 5
3. Measurement Identity SDES Item . . . . . . . . . . . . . . . . 6 3. Measurement Identity SDES Item . . . . . . . . . . . . . . . . 6
3.1. APSI: Application Specific Identifier SDES Item . . . . . 6 3.1. APSI: Application Specific Identifier SDES Item . . . . . 6
4. Measurement Information XR Block . . . . . . . . . . . . . . . 7 4. Measurement Information XR Block . . . . . . . . . . . . . . . 7
4.1. Report Block Structure . . . . . . . . . . . . . . . . . . 7 4.1. Report Block Structure . . . . . . . . . . . . . . . . . . 7
4.2. Definition of Fields in Measurement Information Report 4.2. Definition of Fields in Measurement Information Report
Block . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Block . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5.1. New RTCP SDES Type value . . . . . . . . . . . . . . . . . 9 5.1. New RTCP SDES Type value . . . . . . . . . . . . . . . . . 10
5.2. New RTCP XR Block Type value . . . . . . . . . . . . . . . 9 5.2. New RTCP XR Block Type value . . . . . . . . . . . . . . . 10
5.3. Contact information for registrations . . . . . . . . . . 9 5.3. Contact information for registrations . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . . 11 7.1. Normative References . . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . . 11 7.2. Informative References . . . . . . . . . . . . . . . . . . 12
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 12 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 13
A.1. draft-ietf-xrblock-xr-rtcp-meas-identity-00 . . . . . . . 12 A.1. draft-ietf-xrblock-xr-rtcp-meas-identity-00 . . . . . . . 13
A.2. draft-ietf-xrblock-xr-rtcp-meas-identity-01 . . . . . . . 12 A.2. draft-ietf-xrblock-xr-rtcp-meas-identity-01 . . . . . . . 13
A.3. draft-ietf-xrblock-xr-rtcp-meas-identity-02 . . . . . . . 12 A.3. draft-ietf-xrblock-xr-rtcp-meas-identity-02 . . . . . . . 13
A.4. draft-ietf-xrblock-xr-rtcp-meas-identity-03 . . . . . . . 13 A.4. draft-ietf-xrblock-xr-rtcp-meas-identity-03 . . . . . . . 14
A.5. draft-ietf-xrblock-xr-rtcp-meas-identity-04 . . . . . . . 13 A.5. draft-ietf-xrblock-xr-rtcp-meas-identity-04 . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14 A.6. draft-ietf-xrblock-xr-rtcp-meas-identity-05 . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction 1. Introduction
This draft defines one new RTCP SDES item and one new XR Report Block This document defines one new RTP Control Protocol (RTCP) Source
carrying parameters that identify and describe a measurement period, Description (SDES) [RFC3550] item, and one new Extended Report (XR)
to which one or more other RTCP XR Report Blocks may refer. Report Block carrying parameters that identify and describe a
measurement period, to which one or more other RTCP XR Report Blocks
may refer.
The SDES item provides a field for an application specific auxiliary The SDES item provides a field for an application specific auxiliary
identifier. This identifier may be used to correlate data in XR identifier. This identifier may be used to correlate data in XR
Blocks within an RTP session with data from a non-RTP session. Blocks within an RTP session with data from a non-RTP session.
A RTCP Measurement Identity SDES packet MAY be associated with a set A RTCP Measurement Identity SDES packet may be associated with a set
of RTCP XR metrics blocks which share the same application specific of RTCP XR metrics blocks which share the same application specific
measurement identifier. measurement identifier.
The XR Report Block does not contain any measurement results The XR Report Block does not contain any measurement results
(metrics). Rather, it provide information relevant to a measurement (metrics). Instead, it provides information relevant to a
reported in one or more other block types, including: measurement reported in one or more other block types, including:
o the sequence number of the first packet of the RTP session, o the sequence number of the first packet of the RTP session,
o the extended sequence numbers of the first packet of the current o the extended sequence numbers of the first packet of the current
measurement interval, and the last packet included in the measurement interval, and the last packet included in the
measurement, measurement,
o the duration of the most recent measurement interval and o the duration of the most recent measurement interval and
o the duration of the interval applicable to cumulative measurements o the duration of the interval applicable to cumulative measurements
(which may be the duration of the RTP session to date). (which may be the duration of the RTP session to date).
The method for calculation of the extended RTP sequence number is The method for calculation of the extended RTP sequence number is
provide in [RFC3550]. provide in Real-time Transport Protocol (RTP) [RFC3550].
The RTCP XR Report Block containing the measurement information is The RTCP XR Report Block containing the measurement information is
intended to provide a single copy of the information necessary to intended to provide a single copy of the information necessary to
relate measurement data in the RTCP XR blocks to the stream, and relate measurement data in the RTCP XR blocks to the stream, and
measurement period, to which they refer. Commonly, multiple other measurement period, to which they refer. Commonly, multiple other
small metric blocks contain measurement data for the same stream and small metric blocks contain measurement data for the same stream and
period, and it would be a large overhead if all of these metric period, and it would be a large overhead if all of these metric
blocks carried duplicated data for measurement identification. blocks carried duplicated data for measurement identification.
The RTCP XR Report Block MAY be associated with a set of RTCP XR The RTCP XR Report Block may be associated with a set of RTCP XR
metrics blocks which share the same information relevant to a metrics blocks which share the same information relevant to a
reported measurement. There MAY be several such sets in an RTCP reported measurement. There may be several such sets in an RTCP
packet, in which each set share the same information relevant to a packet, in which each set share the same information relevant to a
reported measurement. There MAY also be RTCP XR blocks in the packet reported measurement. There may also be RTCP XR blocks in the packet
which are not associated with a Measurement Information block, for which are not associated with a Measurement Information block, for
example blocks which were defined before the Measurement Identity and example blocks which were defined before the Measurement Identity and
information mechanism was introduced by this document. information mechanism was introduced by this document.
1.1. RTCP and RTCP XR Reports 1.1. 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 defines an extensible structure for reporting using an RTCP Extended
Report (XR). This draft defines a new Extended Report block that Report (XR). This document 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].
1.2. Performance Metrics Framework 1.2. Performance Metrics Framework
The Performance Metrics Framework [RFC6390] provides guidance on the The Performance Metrics Framework [RFC6390] provides guidance on the
definition and specification of performance metrics. The RTP definition and specification of performance metrics. The RTP
Monitoring Architectures[MONARCH] provides guideline for reporting Monitoring Architectures[MONARCH] provides guideline for reporting
block format using RTCP XR . The SDES item and XR Block described in block format using RTCP XR. The SDES item and XR Block described in
this draft are in accordance with [RFC6390] and [MONARCH]. this document are in accordance with [RFC6390] and [MONARCH].
1.3. Applicability 1.3. Applicability
The RTCP SDES item and the RTCP XR block defined in this document The RTCP SDES item and the RTCP XR block defined in this document
provides information relevant to the measurements for members of a provides information relevant to the measurements for members of a
family of RTCP XR metrics blocks which are designed to use it. To family of RTCP XR metrics blocks which are designed to use it. To
use the mechanism defined here, the RTCP XR block containing use the mechanism defined here, the RTCP XR block containing
measurement information is not required to be in the same RTCP packet measurement information is not required to be in the same RTCP packet
as the SDES item containing measurement identity. as the SDES item containing measurement identity.
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].
3. Measurement Identity SDES Item 3. Measurement Identity SDES Item
This section defines the format of the Measurement Identity SDES This section defines the format of the Measurement Identity SDES
item. The SDES item is carried in the RTCP SDES packet. The packet item. The SDES item is carried in the RTCP SDES packet. The packet
format for the RTCP SDES is defined in Section 6.5 of [RFC3550]. format for the RTCP SDES is defined in Section 6.5 of [RFC3550].
Each SDES packet is composed of a header with fixed-length fields for Each SDES packet is composed of a header with fixed-length fields for
version, source count, packet type (PT), and length, followed by zero version, source count, packet type (PT), and length, followed by zero
of more SDES items. In the SDES packet, the PT field is set to SDES of more SDES items. In the SDES packet, the PT field is set to SDES
(202). (202).
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First sequence number: 16 bits First sequence number: 16 bits
The RTP sequence number of the first received RTP packet of the The RTP sequence number of the first received RTP packet of the
session, used to determine the number of packets contributing to session, used to determine the number of packets contributing to
cumulative measurements. cumulative measurements.
Extended first sequence number of interval: 32 bits Extended first sequence number of interval: 32 bits
The extended RTP sequence number of the first received RTP packet The extended RTP sequence number of the first received RTP packet
of the current measurement interval. of the current measurement interval. In accordance with
[RFC3550], the extended sequence number is expressed as the low 16
bits value containing the sequence number received in an RTP data
packet and the most significant 16 bits value containing the
corresponding count of sequence number cycles.
Extended last sequence number: 32 bits Extended last sequence number: 32 bits
The extended RTP sequence number of the last received RTP packet The extended RTP sequence number of the last received RTP packet
which contributed to this measurement. which contributed to this measurement. In accordance with
[RFC3550], the extended sequence number is expressed as the low 16
bits value containing the sequence number received in an RTP data
packet and the most significant 16 bits value containing the
corresponding count of sequence number cycles.
Measurement Duration (Cumulative) : 32 bits Measurement Duration (Cumulative) : 32 bits
The duration, expressed in units of 1/65536 seconds, of the The duration, expressed in units of 1/65536 seconds, of the
reporting interval applicable to Cumulative reports which use this reporting interval applicable to Cumulative reports which use this
Measurement Information block. The value of this field can be Measurement Information block. The value of this field can be
calculated by the receiver of the RTP media stream, for example, calculated by the receiver of the RTP media stream, for example,
based on received RTP media packets or using RTCP method described based on received RTP media packets or using RTCP method described
in [RFC3550]. in [RFC3550].
skipping to change at page 10, line 10 skipping to change at page 11, line 10
101 Software Avenue, Yuhua District 101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012 Nanjing, Jiangsu 210012
China China
6. Security Considerations 6. Security Considerations
RTCP reports can contain sensitive information, including information RTCP reports can contain sensitive information, including information
about the nature and duration of a session established between two or about the nature and duration of a session established between two or
more endpoints. Therefore, the use of security mechanisms with RTP, more endpoints. Therefore, the use of security mechanisms with RTP,
as documented in Section 9 of [RFC3550] should apply. as documented in Section 9 of [RFC3550] SHOULD apply.
7. References 7. References
7.1. Normative References 7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", March 1997. Requirement Levels", March 1997.
[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.
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o The Editorial changes. o The Editorial changes.
A.5. draft-ietf-xrblock-xr-rtcp-meas-identity-04 A.5. draft-ietf-xrblock-xr-rtcp-meas-identity-04
The following are the major changes to The following are the major changes to
draft-ietf-xrblock-xr-rtcp-meas-identity-03: draft-ietf-xrblock-xr-rtcp-meas-identity-03:
o Change unit of measurement duration from ms to 1/65536 seconds. o Change unit of measurement duration from ms to 1/65536 seconds.
A.6. draft-ietf-xrblock-xr-rtcp-meas-identity-05
The following are the major changes to
draft-ietf-xrblock-xr-rtcp-meas-identity-04:
o Clarify the definition of extended sequence number.
Authors' Addresses Authors' Addresses
Geoff Hunt Geoff Hunt
Unaffiliated Unaffiliated
Email: r.geoff.hunt@gmail.com Email: r.geoff.hunt@gmail.com
Alan Clark Alan Clark
Telchemy Incorporated Telchemy Incorporated
2905 Premiere Parkway, Suite 280 2905 Premiere Parkway, Suite 280
 End of changes. 20 change blocks. 
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