Considerations for Selecting RTCP Extended Report (XR) Metrics for the WebRTC Statistics API
draft-ietf-xrblock-rtcweb-rtcp-xr-metrics-05

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Last updated 2016-11-27
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XR Block Working Group                                          V. Singh
Internet-Draft                                              callstats.io
Intended status: Standards Track                                R. Huang
Expires: May 31, 2017                                            R. Even
                                                                  Huawei
                                                            D. Romascanu

                                                                 L. Deng
                                                            China Mobile
                                                       November 27, 2016

 Considerations for Selecting RTCP Extended Report (XR) Metrics for the
                         WebRTC Statistics API
              draft-ietf-xrblock-rtcweb-rtcp-xr-metrics-05

Abstract

   This document describes monitoring features related to media streams
   in Web real-time communication (WebRTC).  It provides a list of RTCP
   Sender Report, Receiver Report and Extended Report 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

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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Singh, et al.             Expires May 31, 2017                  [Page 1]
Internet-Draft         RTCP XR Metrics for RTCWEB          November 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  RTP Statistics in WebRTC Implementations  . . . . . . . . . .   3
   4.  Considerations for Impact of Measurement Interval . . . . . .   4
   5.  Candidate Metrics . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Network Impact Metrics  . . . . . . . . . . . . . . . . .   5
       5.1.1.  Loss and Discard Packet Count Metric  . . . . . . . .   5
       5.1.2.  Burst/Gap Pattern Metrics for Loss and Discard  . . .   6
       5.1.3.  Run Length Encoded Metrics for Loss, Discard  . . . .   7
     5.2.  Application Impact Metrics  . . . . . . . . . . . . . . .   7
       5.2.1.  Discard Octets Metric . . . . . . . . . . . . . . . .   7
       5.2.2.  Frame Impairment Summary Metrics  . . . . . . . . . .   8
       5.2.3.  Jitter Buffer Metrics . . . . . . . . . . . . . . . .   8
     5.3.  Recovery metrics  . . . . . . . . . . . . . . . . . . . .   9
       5.3.1.  Post-repair Packet Count Metrics  . . . . . . . . . .   9
       5.3.2.  Run Length Encoded Metric for Post-repair . . . . . .   9
   6.  Identifiers from Sender, Receiver, and Extended Report Blocks  10
     6.1.  Cumulative Number of Packets and Octets Sent  . . . . . .  10
     6.2.  Cumulative Number of Packets and Octets Received  . . . .  10
     6.3.  Cumulative Number of Packets Lost . . . . . . . . . . . .  11
     6.4.  Interval Packet Loss and Jitter . . . . . . . . . . . . .  11
     6.5.  Cumulative Number of Packets and Octets Discarded . . . .  11
     6.6.  Cumulative Number of Packets Repaired . . . . . . . . . .  11
     6.7.  Burst Packet Loss and Burst Discards  . . . . . . . . . .  11
     6.8.  Burst/Gap Rates . . . . . . . . . . . . . . . . . . . . .  12
     6.9.  Frame Impairment Metrics  . . . . . . . . . . . . . . . .  12
   7.  Adding new metrics to WebRTC Statistics API . . . . . . . . .  13
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