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RTP Control Protocol (RTCP) Extended Report (XR) Block for Discard Count Metric Reporting
RFC 7002

Document type: RFC - Proposed Standard (September 2013)
Document stream: IETF
Last updated: 2013-09-04
Other versions: plain text, pdf, html

IETF State: WG Document
Consensus: Unknown
Document shepherd: Shida Schubert
Shepherd Write-Up: Last changed 2013-05-17

IESG State: RFC 7002 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Gonzalo Camarillo
Send notices to: xrblock-chairs@tools.ietf.org, draft-ietf-xrblock-rtcp-xr-discard@tools.ietf.org

Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 7002                                      Telchemy
Category: Standards Track                                        G. Zorn
ISSN: 2070-1721                                              Network Zen
                                                                   Q. Wu
                                                                  Huawei
                                                          September 2013

         RTP Control Protocol (RTCP) Extended Report (XR) Block
                   for Discard Count Metric Reporting

Abstract

   This document defines an RTP Control Protocol (RTCP) Extended Report
   (XR) block that allows the reporting of a simple discard count metric
   for use in a range of RTP applications.

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/rfc7002.

Copyright Notice

   Copyright (c) 2013 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, et al.                Standards Track                    [Page 1]
RFC 7002                     RTCP XR Discard              September 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Discard Count Report Block  . . . . . . . . . . . . . . .   2
     1.2.  RTCP and RTCP Extended Reports  . . . . . . . . . . . . .   3
     1.3.  Performance Metrics Framework . . . . . . . . . . . . . .   3
     1.4.  Applicability . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Discard Count Metrics Block . . . . . . . . . . . . . . . . .   4
     3.1.  Report Block Structure  . . . . . . . . . . . . . . . . .   5
     3.2.  Definition of Fields in the Discard Count Metrics Block .   5
   4.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  SDP rtcp-xr Attribute Extension . . . . . . . . . . . . .   7
     4.2.  Offer/Answer Usage  . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  New RTCP XR Block Type Value  . . . . . . . . . . . . . .   8
     5.2.  New RTCP XR SDP Parameter . . . . . . . . . . . . . . . .   8
     5.3.  Contact Information for Registrations . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Metrics Represented Using the Template from RFC 6390  11

1.  Introduction

1.1.  Discard Count Report Block

   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
   supports the reporting of the number of packets that are received
   correctly but are never played out, typically because they arrive too
   late (buffer underflow) or too early (buffer overflow) to be played
   out.  The metric is applicable both to systems that use packet loss
   repair techniques (such as forward error correction [RFC5109] or
   retransmission [RFC4588]) and to those that do not.

   This metric is useful for identifying the existence, and
   characterizing the severity, of packet transport problems that may
   affect users' perceptions of a service delivered over RTP.

   This block may be used in conjunction with [RFC7003], which provides

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