RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Loss Metric Reporting
RFC 6958

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Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 6958                                      Telchemy
Category: Standards Track                                       S. Zhang
ISSN: 2070-1721                                                  J. Zhao
                                                                   STTRI
                                                              Q. Wu, Ed.
                                                                  Huawei
                                                                May 2013

       RTP Control Protocol (RTCP) Extended Report (XR) Block for
                    Burst/Gap Loss Metric Reporting

Abstract

   This document defines an RTP Control Protocol (RTCP) Extended Report
   (XR) Block that allows the reporting of burst and gap loss metrics
   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/rfc6958.

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 6958                 RTCP XR Burst/Gap Loss                 May 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Burst/Gap Loss Metrics Block  . . . . . . . . . . . . . .   2
     1.2.  RTCP and RTCP XR Reports  . . . . . . . . . . . . . . . .   3
     1.3.  Performance Metrics Framework . . . . . . . . . . . . . .   3
     1.4.  Applicability . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Burst/Gap Loss Metrics Block  . . . . . . . . . . . . . . . .   4
     3.1.  Report Block Structure  . . . . . . . . . . . . . . . . .   5
     3.2.  Definition of Fields in Burst/Gap Loss Metrics Block  . .   5
     3.3.  Derived Metrics Based on Reported Metrics . . . . . . . .   7
   4.  Considerations for Voice-over-IP Applications . . . . . . . .   8
   5.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  SDP rtcp-xr-attrib Attribute Extension  . . . . . . . . .   9
     5.2.  Offer/Answer Usage  . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  New RTCP XR Block Type Value  . . . . . . . . . . . . . .   9
     6.2.  New RTCP XR SDP Parameter . . . . . . . . . . . . . . . .   9
     6.3.  Contact Information for Registrations . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Appendix A.  Metrics Represented Using the Template from RFC 6390  13

1.  Introduction

1.1.  Burst/Gap Loss Metrics 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 proportion of packets lost by the
   network.  The losses during loss bursts are reported, together with
   the number of bursts and additional data, allowing the calculation of
   statistical parameters (mean and variance) of the distribution of
   burst lengths.  Some uses of these metrics depend on the availability
   of the metric "cumulative number of packets lost" from RTCP
   [RFC3550].

   This block provides information on transient IP problems.  Burst/gap
   metrics are typically used in Cumulative reports; however, they also
   may be used in Interval reports.  The burstiness of packet loss