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Measurement Identity and Information Reporting Using a Source Description (SDES) Item and an RTCP Extended Report (XR) Block
RFC 6776

Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 6776                                      Telchemy
Category: Standards Track                                          Q. Wu
ISSN: 2070-1721                                                   Huawei
                                                            October 2012

         Measurement Identity and Information Reporting Using a
 Source Description (SDES) Item and an RTCP Extended Report (XR) Block

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 blocks may refer.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6776.

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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   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
   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.

Clark & Wu                   Standards Track                    [Page 1]
RFC 6776            Measurement Identity and Duration       October 2012

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.1.  RTCP and RTCP XRs . . . . . . . . . . . . . . . . . . . . . 3
     1.2.  Performance Metrics Framework . . . . . . . . . . . . . . . 3
     1.3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     2.1.  Standards Language  . . . . . . . . . . . . . . . . . . . . 4
   3.  Measurement Identity SDES Item  . . . . . . . . . . . . . . . . 4
     3.1.  APSI: Application-Specific Identifier SDES Item . . . . . . 4
   4.  Measurement Information XR Block  . . . . . . . . . . . . . . . 5
     4.1.  Report Block Structure  . . . . . . . . . . . . . . . . . . 5
     4.2.  Definition of Fields in Measurement Information Report
           Block . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
     5.1.  New RTCP SDES Item Type Value . . . . . . . . . . . . . . . 7
     5.2.  New RTCP XR Block Type Value  . . . . . . . . . . . . . . . 7
     5.3.  Contact Information for Registrations . . . . . . . . . . . 7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 8
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 8

1.  Introduction

   This document defines one new RTP Control Protocol (RTCP) Source
   Description (SDES) [RFC3550] item and one new Extended Report (XR)
   block carrying parameters that identify and describe a measurement
   period to which one or more other RTCP XR 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.

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

   The XR 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,

Clark & Wu                   Standards Track                    [Page 2]

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