Considerations for Selecting RTP Control Protocol (RTCP) Extended Report (XR) Metrics for the WebRTC Statistics API
RFC 8451
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Type |
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RFC - Informational
(September 2018; No errata)
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Last updated |
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2018-09-19
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IETF
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plain text
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html
bibtex
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Reviews |
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Shida Schubert
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Shepherd write-up |
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Show
(last changed 2017-09-21)
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IESG state |
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RFC 8451 (Informational)
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Ben Campbell
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Send notices to |
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Shida Schubert <shida.at.ietf@gmail.com>
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IANA review state |
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IANA OK - No Actions Needed
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No IANA Actions
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Internet Engineering Task Force (IETF) V. Singh
Request for Comments: 8451 callstats.io
Category: Informational R. Huang
ISSN: 2070-1721 R. Even
Huawei
D. Romascanu
Individual
L. Deng
China Mobile
September 2018
Considerations for Selecting RTP Control Protocol (RTCP)
Extended Report (XR) Metrics for the WebRTC Statistics API
Abstract
This document describes monitoring features related to media streams
in Web real-time communication (WebRTC). It provides a list of RTP
Control Protocol (RTCP) Sender Report (SR), Receiver Report (RR), and
Extended Report (XR) metrics, which may need to be supported by RTP
implementations in some diverse environments. It lists a set of
identifiers for the WebRTC's statistics API. These identifiers are a
set of RTCP SR, RR, and XR metrics related to the transport of
multimedia flows.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8451.
Singh, et al. Informational [Page 1]
RFC 8451 RTCP XR Metrics for WebRTC September 2018
Copyright Notice
Copyright (c) 2018 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
(https://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.
Singh, et al. Informational [Page 2]
RFC 8451 RTCP XR Metrics for WebRTC September 2018
Table of Contents
1. Introduction ....................................................4
2. Terminology .....................................................4
3. RTP Statistics in WebRTC Implementations ........................5
4. Considerations for Impact of Measurement Interval ...............5
5. Candidate Metrics ...............................................6
5.1. Network Impact Metrics .....................................6
5.1.1. Loss and Discard Packet Count Metric ................6
5.1.2. Burst/Gap Pattern Metrics for Loss and Discard ......7
5.1.3. Run-Length Encoded Metrics for Loss and Discard .....8
5.2. Application Impact Metrics .................................8
5.2.1. Discarded Octets Metric .............................8
5.2.2. Frame Impairment Summary Metrics ....................9
5.2.3. Jitter Buffer Metrics ...............................9
5.3. Recovery Metrics ..........................................10
5.3.1. Post-Repair Packet Count Metrics ...................10
5.3.2. Run-Length Encoded Metric for Post-Repair ..........10
6. Identifiers from Sender, Receiver, and Extended Report Blocks ..11
6.1. Cumulative Number of Packets and Octets Sent ..............11
6.2. Cumulative Number of Packets and Octets Received ..........11
6.3. Cumulative Number of Packets Lost .........................11
6.4. Interval Packet Loss and Jitter ...........................12
6.5. Cumulative Number of Packets and Octets Discarded .........12
6.6. Cumulative Number of Packets Repaired .....................12
6.7. Burst Packet Loss and Burst Discards ......................12
6.8. Burst/Gap Rates ...........................................13
6.9. Frame Impairment Metrics ..................................13
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