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Use Cases for Telepresence Multistreams
RFC 7205

Internet Engineering Task Force (IETF)                        A. Romanow
Request for Comments: 7205                                         Cisco
Category: Informational                                        S. Botzko
ISSN: 2070-1721                                             M. Duckworth
                                                                 Polycom
                                                            R. Even, Ed.
                                                     Huawei Technologies
                                                              April 2014

                Use Cases for Telepresence Multistreams

Abstract

   Telepresence conferencing systems seek to create an environment that
   gives users (or user groups) that are not co-located a feeling of co-
   located presence through multimedia communication that includes at
   least audio and video signals of high fidelity.  A number of
   techniques for handling audio and video streams are used to create
   this experience.  When these techniques are not similar,
   interoperability between different systems is difficult at best, and
   often not possible.  Conveying information about the relationships
   between multiple streams of media would enable senders and receivers
   to make choices to allow telepresence systems to interwork.  This
   memo describes the most typical and important use cases for sending
   multiple streams in a telepresence conference.

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 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/rfc7205.

Romanow, et al.               Informational                     [Page 1]
RFC 7205                 Telepresence Use Cases               April 2014

Copyright Notice

   Copyright (c) 2014 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
   (http://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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview of Telepresence Scenarios  . . . . . . . . . . . . .   4
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Point-to-Point Meeting: Symmetric . . . . . . . . . . . .   7
     3.2.  Point-to-Point Meeting: Asymmetric  . . . . . . . . . . .   7
     3.3.  Multipoint Meeting  . . . . . . . . . . . . . . . . . . .   9
     3.4.  Presentation  . . . . . . . . . . . . . . . . . . . . . .  10
     3.5.  Heterogeneous Systems . . . . . . . . . . . . . . . . . .  11
     3.6.  Multipoint Education Usage  . . . . . . . . . . . . . . .  12
     3.7.  Multipoint Multiview (Virtual Space)  . . . . . . . . . .  14
     3.8.  Multiple Presentation Streams - Telemedicine  . . . . . .  15
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   6.  Informative References  . . . . . . . . . . . . . . . . . . .  16

Romanow, et al.               Informational                     [Page 2]
RFC 7205                 Telepresence Use Cases               April 2014

1.  Introduction

   Telepresence applications try to provide a "being there" experience
   for conversational video conferencing.  Often, this telepresence
   application is described as "immersive telepresence" in order to
   distinguish it from traditional video conferencing and from other
   forms of remote presence not related to conversational video
   conferencing, such as avatars and robots.  The salient
   characteristics of telepresence are often described as: being actual
   sized, providing immersive video, preserving interpersonal
   interaction, and allowing non-verbal communication.

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