RTP Control Protocol (RTCP) Extended Report (XR) Block for the Bytes Discarded Metric
RFC 7243
Internet Engineering Task Force (IETF) V. Singh, Ed.
Request for Comments: 7243 J. Ott
Category: Standards Track Aalto University
ISSN: 2070-1721 I. Curcio
Nokia Research Center
May 2014
RTP Control Protocol (RTCP) Extended Report (XR) Block
for the Bytes Discarded Metric
Abstract
The RTP Control Protocol (RTCP) is used in conjunction with the Real-
time Transport Protocol (RTP) to provide a variety of short-term and
long-term reception statistics. The available reporting may include
aggregate information across longer periods of time as well as
individual packet reporting. This document specifies a report
computing the bytes discarded from the de-jitter buffer after
successful reception.
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/rfc7243.
Singh, et al. Standards Track [Page 1]
RFC 7243 RTCP XR Bytes Discarded May 2014
Copyright Notice
Copyright (c) 2014 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.
Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................4
3. Bytes Discarded Report Block ....................................4
4. Protocol Operation ..............................................6
4.1. Reporting Node (Receiver) ..................................6
4.2. Media Sender ...............................................6
5. SDP Signaling ...................................................7
6. Security Considerations .........................................7
7. IANA Considerations .............................................8
7.1. XR Report Block Registration ...............................8
7.2. SDP Parameter Registration .................................8
7.3. Contact Information for IANA Registrations .................8
8. Acknowledgments .................................................8
9. References ......................................................9
9.1. Normative References .......................................9
9.2. Informative References .....................................9
Appendix A. Metrics Represented Using the Template from RFC 6390 ..11
Singh, et al. Standards Track [Page 2]
RFC 7243 RTCP XR Bytes Discarded May 2014
1. Introduction
RTP [RFC3550] provides a transport for real-time media flows such as
audio and video together with the RTP Control Protocol (RTCP), which
provides periodic feedback about the media streams received in a
specific duration. In addition, RTCP can be used for timely feedback
about individual events to report (e.g., packet loss) [RFC4585].
Both long-term and short-term feedback enable a media sender to adapt
its media transmission and/or encoding dynamically to the observed
path characteristics.
[RFC3611] defines RTCP Extended Reports as a detailed reporting
framework to provide more than just the coarse Receiver Report (RR)
statistics. The detailed reporting may enable a media sender to
react more appropriately to the observed networking conditions as
these can be characterized better, although at the expense of extra
overhead.
In addition to lost packets, [RFC3611] defines the notion of
"discarded" packets: packets that were received but dropped from the
de-jitter buffer because they were either too early (for buffering)
or too late (for playout). The "discard rate" metric is part of the
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