RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Synchronization Delay and Offset Metrics Reporting
draft-ietf-xrblock-rtcp-xr-synchronization-01

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Last updated 2012-10-17
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Network Working Group                                          H. Asaeda
Internet-Draft                                                      NICT
Intended status: Standards Track                                R. Huang
Expires: April 21, 2013                                            Q. Wu
                                                                  Huawei
                                                        October 18, 2012

      RTP Control Protocol (RTCP) Extended Report (XR) Blocks for
           Synchronization Delay and Offset Metrics Reporting
             draft-ietf-xrblock-rtcp-xr-synchronization-01

Abstract

   This document defines two RTP Control Protocol (RTCP) Extended Report
   (XR) Blocks and associated with SDP parameters that allow the
   reporting of synchronization delay and offset metrics for use in a
   range of RTP applications.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on April 21, 2013.

Copyright Notice

   Copyright (c) 2012 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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1.  Standards Language . . . . . . . . . . . . . . . . . . . .  3
   3.  Applicability  . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  RTP Flows Initial Synchronization Delay Report Block . . . . .  4
     4.1.  Metric Block Structure . . . . . . . . . . . . . . . . . .  5
     4.2.  Definition of Fields in RTP Flow Initial
           Synchronization Delay Metrics Block  . . . . . . . . . . .  5
   5.  RTP Flows Synchronization Offset Metrics Block . . . . . . . .  6
     5.1.  Metric Block Structure . . . . . . . . . . . . . . . . . .  6
     5.2.  Definition of Fields in RTP Flow General
           Synchronization Offset Metrics Block . . . . . . . . . . .  7
   6.  SDP Signaling  . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . .  8
     6.2.  Offer/Answer Usage . . . . . . . . . . . . . . . . . . . .  8
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     10.1. Normative References . . . . . . . . . . . . . . . . . . .  9
     10.2. Informative References . . . . . . . . . . . . . . . . . . 10
   Appendix A.  Change Log  . . . . . . . . . . . . . . . . . . . . . 10
     A.1.  draft-ietf-xrblock-rtcp-xr-syncronization-01 . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11

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1.  Introduction

   This draft defines two new block types to augment those defined in
   [RFC3611], for use in a range of RTP applications.

   The first new block type supports reporting of Initial
   Synchronization Delay to establish multimedia session.  Information
   is recorded about time difference between the start of RTP sessions
   and the time the RTP receiver acquires all components of RTP sessions
   in the multimedia session [RFC6051].

   The second new block type supports reporting of the relative
   synchronization offset time of two arbitrary streams (e.g., between
   audio and video streams), with the same RTCP CNAME included in RTCP
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