RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Discard Metric Reporting
RFC 7003

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Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 7003                                      Telchemy
Category: Standards Track                                       R. Huang
ISSN: 2070-1721                                               Q. Wu, Ed.
                                                                  Huawei
                                                          September 2013

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

Abstract

   This document defines an RTP Control Protocol (RTCP) Extended Report
   (XR) block that allows the reporting of burst and gap discard 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/rfc7003.

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
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   described in the Simplified BSD License.

Clark, et al.                Standards Track                    [Page 1]
RFC 7003                RTCP XR Burst/Gap Discard         September 2013

Table of Contents
   1. Introduction ....................................................2
      1.1. Burst/Gap Discard Metrics Block ............................2
      1.2. RTCP and RTCP Extended Reports .............................3
      1.3. Performance Metrics Framework ..............................3
      1.4. Applicability ..............................................3
   2. Terminology .....................................................3
   3. Burst/Gap Discard Metrics Block .................................4
      3.1. Report Block Structure .....................................5
      3.2. Definition of Fields in Burst/Gap Discard Metrics Block ....5
      3.3. Derived Metrics Based on Reported Metrics ..................7
   4. Considerations for Voice-over-IP Applications ...................7
   5. SDP Signaling ...................................................8
      5.1. SDP rtcp-xr Attribute Extension ............................8
      5.2. Offer/Answer Usage .........................................8
   6. IANA Considerations .............................................8
      6.1. New RTCP XR Block Type Value ...............................8
      6.2. New RTCP XR SDP Parameter ..................................9
      6.3. Contact Information for Registrations ......................9
   7. Security Considerations .........................................9
   8. Contributors ....................................................9
   9. Acknowledgments .................................................9
   10. References ....................................................10
      10.1. Normative References .....................................10
      10.2. Informative References ...................................10
   Appendix A.  Metrics Represented Using the Template from RFC 6390..12

1.  Introduction

1.1.  Burst/Gap Discard 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 discarded by the
   jitter buffer at the receiver, using packet discard logic according
   to the jitter buffer algorithms.  The discards during discard bursts
   are reported, together with the number of bursts.  This block is
   intended to be used in conjunction with [RFC7002], which provides the
   total packets discarded and on which this block therefore depends.
   However, the metric in [RFC7002] may be used independently of the
   metrics in this block.

   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 (see the Interval Metric flag in
   Section 3.2).  The burstiness of packet discard affects user