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Versions: 00 01 02 03 04 05 06 07 08 09 10 RFC 6776

Audio/Video Transport Working Group                              G. Hunt
Internet-Draft                                              Unaffiliated
Intended status: Standards Track                                A. Clark
Expires: January 14, 2013                                       Telchemy
                                                                   Q. Wu
                                                                  Huawei
                                                           July 13, 2012


 Measurement Identity and information Reporting using SDES item and XR
                                 Block
            draft-ietf-xrblock-rtcp-xr-meas-identity-09.txt

Abstract

   This document defines an RTP Control Protocol (RTCP) Source
   Description (SDES) item and an RTCP Extended Report (XR) Block
   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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 14, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must



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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . .  4
     1.2.  Performance Metrics Framework  . . . . . . . . . . . . . .  4
     1.3.  Applicability  . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.1.  Standards Language . . . . . . . . . . . . . . . . . . . .  5
   3.  Measurement Identity SDES Item . . . . . . . . . . . . . . . .  6
     3.1.  APSI: Application Specific Identifier SDES Item  . . . . .  6
   4.  Measurement Information XR Block . . . . . . . . . . . . . . .  7
     4.1.  Report Block Structure . . . . . . . . . . . . . . . . . .  7
     4.2.  Definition of Fields in Measurement Information Report
           Block  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
     5.1.  New RTCP SDES Type value . . . . . . . . . . . . . . . . . 10
     5.2.  New RTCP XR Block Type value . . . . . . . . . . . . . . . 10
     5.3.  Contact information for registrations  . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  Change Log  . . . . . . . . . . . . . . . . . . . . . 13
     A.1.  draft-ietf-xrblock-xr-rtcp-meas-identity-09  . . . . . . . 13
     A.2.  draft-ietf-xrblock-xr-rtcp-meas-identity-08  . . . . . . . 13
     A.3.  draft-ietf-xrblock-xr-rtcp-meas-identity-07  . . . . . . . 13
     A.4.  draft-ietf-xrblock-xr-rtcp-meas-identity-06  . . . . . . . 13
     A.5.  draft-ietf-xrblock-xr-rtcp-meas-identity-05  . . . . . . . 13
     A.6.  draft-ietf-xrblock-xr-rtcp-meas-identity-04  . . . . . . . 14
     A.7.  draft-ietf-xrblock-xr-rtcp-meas-identity-03  . . . . . . . 14
     A.8.  draft-ietf-xrblock-xr-rtcp-meas-identity-02  . . . . . . . 14
     A.9.  draft-ietf-xrblock-xr-rtcp-meas-identity-01  . . . . . . . 14
     A.10. draft-ietf-xrblock-xr-rtcp-meas-identity-00  . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16












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1.  Introduction

   This document defines one new RTP Control Protocol (RTCP) Source
   Description (SDES) [RFC3550] item, and one new Extended Report (XR)
   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
   identifier.  This identifier may be used to correlate data in XR
   Blocks within an RTP session with data from a non-RTP session.

   A RTCP Measurement Identity SDES packet may be associated with a set
   of RTCP XR metrics blocks which share the same application specific
   measurement identifier.

   The XR Report Block does not contain any measurement results
   (metrics).  Instead, it provides information relevant to a
   measurement reported in one or more other block types, including:

   o  the sequence number of the first packet of the RTP session,

   o  the extended sequence numbers of the first packet of the current
      measurement interval, and the last packet included in the
      measurement,

   o  the duration of the most recent measurement interval and

   o  the duration of the interval applicable to cumulative measurements
      (which may be the duration of the RTP session to date).

   The method for calculation of the extended RTP sequence number is
   provide in Real-time Transport Protocol (RTP) [RFC3550].

   The RTCP XR Report Block containing the measurement information is
   intended to provide a single copy of the information necessary to
   relate measurement data in the RTCP XR blocks to the stream, and
   measurement period, to which they refer.  Commonly, multiple other
   small metric blocks contain measurement data for the same stream and
   period, and it would be a large overhead if all of these metric
   blocks carried duplicated data for measurement identification.

   The RTCP XR Report Block may be associated with a set of RTCP XR
   metrics blocks which share the same information relevant to a
   reported measurement.  There may be several such sets in an RTCP
   packet, in which each set share the same information relevant to a
   reported measurement.  There may also be RTCP XR blocks in the packet
   which are not associated with a Measurement Information block, for



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   example blocks which were defined before the Measurement Identity and
   information mechanism was introduced by this document.

1.1.  RTCP and RTCP XR Reports

   The use of RTCP for reporting is defined in [RFC3550].  [RFC3611]
   defines an extensible structure for reporting using an RTCP Extended
   Report (XR).  This document defines a new Extended Report block.  The
   use of Extended Report blocks is defined by [RFC3611].

1.2.  Performance Metrics Framework

   The Performance Metrics Framework [RFC6390] provides guidance on the
   definition and specification of performance metrics.  The RTP
   Monitoring Architectures[MONARCH] provides guideline for reporting
   block format using RTCP XR.  The SDES item and XR Block described in
   this document are in accordance with [RFC6390] and [MONARCH].

1.3.  Applicability

   The RTCP SDES item and the RTCP XR block defined in this document
   provides information relevant to the measurements for members of a
   family of RTCP XR metrics blocks which are designed to use it.  To
   use the mechanism defined here, the RTCP XR block containing
   measurement information is not required to be in the same RTCP packet
   as the SDES item containing measurement identity.

























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2.  Terminology

2.1.  Standards Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].












































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3.  Measurement Identity SDES Item

   This section defines the format of the Measurement Identity SDES
   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].
   Each SDES packet is composed of a header with fixed-length fields for
   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
   (202).

3.1.  APSI: Application Specific Identifier SDES Item

       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    APSI=TBD   |     length    |application specific identifier
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   ....
      +-+-+-+-+-+-+-+-+

   Application specific identifier is an additional identifier which is
   useful in the context of a specific application, e.g. an MPEG-2
   transport identifier [MPEG2].  This item MUST be ignored by
   applications that are not configured to make use of it.  The
   identifier is variable length.  Its length is described by the length
   field.  The value of the length field does not include the two octet
   SDES item header.
























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4.  Measurement Information XR Block

4.1.  Report Block Structure

   0               1               2               3
    0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     BT=NMI    |    Reserved   |      block length = 7         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    SSRC of stream source                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Reserved           |    first sequence number      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           extended first sequence number of interval          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                 extended last sequence number                 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |              Measurement Duration (Interval)                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Measurement Duration (Cumulative) - Seconds (bit 0-31)    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Measurement Duration (Cumulative) - Fraction (bit 0-31)   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                          Report Block Structure

4.2.  Definition of Fields in Measurement Information Report Block

   Block type (BT): 8 bits

      A Measurement Information Report Block is identified by the
      constant NMI.

      [Note to RFC Editor: please replace NMI with the IANA provided
      RTCP XR block type for this block.]


   Reserved.: 8 bits

      These bits are reserved.  They MUST be set to zero by senders and
      ignored by receivers.


   Block Length: 16 bits

      The length of this report block in 32-bit words minus one.  For
      the Measurement Information block, the block length is equal to 7.




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   SSRC of source: 32 bits

      As defined in Section 4.1 of [RFC3611].


   Reserved: 16 bits

      These bits are reserved.  They MUST be set to zero by senders and
      ignored by receivers.


   First sequence number: 16 bits

      The RTP sequence number of the first received RTP packet of the
      session, used to determine the number of packets contributing to
      cumulative measurements.


   Extended first sequence number of interval: 32 bits

      The extended RTP sequence number of the first received RTP packet
      of the current measurement interval.  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.  For additional information on extended sequence numbers
      see "extended highest sequence number received" definition in RFC
      3550 section 6.4.1 and RFC 3550 Appendix A.1.


   Extended last sequence number: 32 bits

      The extended RTP sequence number of the last received RTP packet
      which contributed to this measurement.  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.  For additional information on extended
      sequence numbers see "extended highest sequence number received"
      definition in RFC 3550 section 6.4.1 and RFC 3550 Appendix A.1.


   Measurement Duration (Interval): 32 bits

      The duration, expressed in units of 1/65536 seconds, of the
      reporting interval applicable to Interval reports which use this
      Measurement Information block .  The value of this field can be
      calculated by the receiver of the RTP media stream, for example,



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      based on received RTP media packets or using RTCP method described
      in [RFC3550].


   Measurement Duration (Cumulative): 64 bits

      The duration of the reporting interval applicable to Cumulative
      reports which use this Measurement Information block.  The value
      of this field is represented using a 64-bit NTP-format timestamp
      as defined in [RFC5905], which is 64-bit unsigned fixed-point
      number with the integer part in the first 32 bits and the
      fractional part in the last 32 bits.  It can be calculated by the
      receiver of the RTP media stream, for example, based on received
      RTP media packets or using RTCP method described in [RFC3550].





































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5.  IANA Considerations

   New SDES types for RTCP SDES are subject to IANA registration.  For
   general guidelines on IANA considerations for RTCP SDES, refer to
   [RFC3550].

5.1.  New RTCP SDES Type value

   This document assigns one additional SDES type in the IANA "RTCP XR
   Block Type Registry" to the Measurement Identity SDES items as
   follow:

   abbrev.      name                          value
   APSI: Application Specific Identifier       TBD

   [Note to RFC Editor: please replace APSI with the IANA provided RTCP
   SDES type for the SDES item.]

5.2.  New RTCP XR Block Type value

   This document assigns the block type value NMI in the IANA "RTCP XR
   Block Type Registry" to the "Measurement Information Block".

   [Note to RFC Editor: please replace NMI with the IANA provided RTCP
   XR block type for this block.]

5.3.  Contact information for registrations


   The contact information for the registrations is:

   Qin Wu (sunseawq@huawei.com)

   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China















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6.  Security Considerations

   RTCP reports can contain sensitive information, including information
   about the nature and duration of a session established between two or
   more endpoints.  Therefore, the use of security mechanisms with RTP,
   as documented in Section 9 of [RFC3550] applies.













































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7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", March 1997.

   [RFC3550]  Schulzrinne, H., "RTP: A Transport Protocol for Real-Time
              Applications", RFC 3550, July 2003.

   [RFC3611]  Friedman, T., Caceres, R., and A. Clark, "RTP Control
              Protocol Extended Reports (RTCP XR)", November 2003.

   [RFC5905]  Mills, D., Matin, J., Ed., Burbank, J., and W. Kasch,
              "Network Time Protocol Version 4: Protocol and Algorithms
              Specification", RFC 5905, June 2010.

7.2.  Informative References

   [MONARCH]  Wu, Q., Hunt, G., and P. , "Monitoring Architectures for
              RTP", ID draft-ietf-avtcore-monarch-17, June 2012.

   [MPEG2]    "ISO/IEC, "Standard 13818-1"", December 2000.

   [RFC6390]  Clark, A. and B. Claise, "Framework for Performance Metric
              Development", RFC 6390, October 2011.

























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Appendix A.  Change Log

   Note to the RFC-Editor: please remove this section prior to
   publication as an RFC.

A.1.  draft-ietf-xrblock-xr-rtcp-meas-identity-09

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-08:

   o  Change header from "Measurement Reporting" to "Measurement
      Identity and Duration".

A.2.  draft-ietf-xrblock-xr-rtcp-meas-identity-08

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-07:

   o  Expand 32-bit measurement interval (cumulative) into 64 bits and
      use NTP timestamp format.

   o  Delete the last sentence in the sub-section 3.1.

   o  Block length change for consistency.

   o  Other editorial changes.

A.3.  draft-ietf-xrblock-xr-rtcp-meas-identity-07

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-06:

   o  One more Editorial change.

A.4.  draft-ietf-xrblock-xr-rtcp-meas-identity-06

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-05:

   o  Editorial changes.

A.5.  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.




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A.6.  draft-ietf-xrblock-xr-rtcp-meas-identity-04

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-03:

   o  Change unit of measurement duration from ms to 1/65536 seconds.

A.7.  draft-ietf-xrblock-xr-rtcp-meas-identity-03

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-02:

   o  The Editorial changes.

A.8.  draft-ietf-xrblock-xr-rtcp-meas-identity-02

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-01:

   o  Relocating information that belong to SDES item and XR Block
      respectively in the section 1.

   o  Rephrasing the text that describes SDES packet composition.

   o  Rephrasing identifier description.

   o  Other Editorial changes.

A.9.  draft-ietf-xrblock-xr-rtcp-meas-identity-01

   The following are the major changes to
   draft-ietf-xrblock-xr-rtcp-meas-identity-00:

   o  Replace SDES item containing additional measurement information
      with XR Block.

   o  Add section 2 to describe following RFC2119 language.

   o  Add Section 1.2 to make SDES item and XR Report be compliant with
      RFC3550 and RFC3611

   o  Add Section 1.3 to make SDES item and XR Report follow Performance
      Metrics Framework and RTP Monitoring Architecture.

   o  Add section5.2 to register the new RTCP XR Block Type value.

   o  Remove RTCP SDES Type values that are needed.




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A.10.  draft-ietf-xrblock-xr-rtcp-meas-identity-00

   The following are the major changes to
   draft-ietf-avt-rtcp-xr-meas-identity-02:

   o  Change the use of SDES item to convey measurement identity instead
      of XR Block in section 2.

   o  Update references.

   o  Update security section and remove SDP signaling section.








































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Authors' Addresses

   Geoff Hunt
   Unaffiliated

   Email: r.geoff.hunt@gmail.com


   Alan Clark
   Telchemy Incorporated
   2905 Premiere Parkway, Suite 280
   Duluth, GA  30097
   USA

   Email: alan.d.clark@telchemy.com


   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: sunseawq@huawei.com



























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