Considerations for Selecting RTP Control Protocol (RTCP) Extended Report (XR) Metrics for the WebRTC Statistics API
RFC 8451

Document Type RFC - Informational (September 2018; No errata)
Last updated 2018-09-19
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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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