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