RTP Application Interaction with Congestion Control
draft-ietf-rmcat-app-interaction-00

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Replaces draft-zanaty-rmcat-app-interaction
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RMCAT WG                                                       M. Zanaty
Internet-Draft                                                     Cisco
Intended status: Informational                                  V. Singh
Expires: February 8, 2015                               Aalto University
                                                           S. Nandakumar
                                                                   Cisco
                                                               Z. Sarker
                                                             Ericsson AB
                                                          August 7, 2014

          RTP Application Interaction with Congestion Control
                  draft-ietf-rmcat-app-interaction-00

Abstract

   Interactive real-time media applications that use the Real-time
   Transport Protocol (RTP) over the User Datagram Protocol (UDP) must
   use congestion control techniques above the UDP layer since it
   provides none.  This memo describes the interactions and conceptual
   interfaces necessary between the application components that relate
   to congestion control, including the RTP layer, the higher-level
   media codec control layer, and the lower-level transport interface,
   as well as components dedicated to congestion control functions.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on February 8, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zanaty, et al.          Expires February 8, 2015                [Page 1]
Internet-Draft        RMCAT Application Interaction          August 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Key Words for Requirements  . . . . . . . . . . . . . . . . .   3
   3.  Conceptual Model  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Implementation Model  . . . . . . . . . . . . . . . . . . . .   5
   5.  Interfaces and Interactions . . . . . . . . . . . . . . . . .   6
     5.1.  Config - Codec Interactions . . . . . . . . . . . . . . .   6
     5.2.  Config - RTP/RTCP Interactions  . . . . . . . . . . . . .   6
     5.3.  Codec - RTP Interactions  . . . . . . . . . . . . . . . .   6
     5.4.  Codec - CC Interactions . . . . . . . . . . . . . . . . .   7
     5.5.  RTP - CC Interactions . . . . . . . . . . . . . . . . . .   9
     5.6.  CC - UDP Interactions . . . . . . . . . . . . . . . . . .   9
     5.7.  CC - Shared State Interactions  . . . . . . . . . . . . .  10
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   Interactive real-time media applications most commonly use RTP
   [RFC3550] over UDP [RFC0768].  Since UDP provides no form of
   congestion control, which is essential for any application deployed
   on the Internet, these RTP applications have historically implemented
   one of the following options at the application layer to address
   their congestion control requirements.

   1.  For media with relatively low packet rates and bit rates, such as
       many speech codecs, some applications use a simple form of
       congestion control that stops transmission permanently or
       temporarily after observing significant packet loss over a
       significant period of time, similar to the RTP circuit breakers
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