Congestion Control based on Forward path Status
draft-gwock-rmcat-ccfs-00

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RMCAT WG                                                        J. Gwock
Internet-Draft                                                 Line Plus
Intended Status: Experimental                          September 3, 2018
Expires: March 7, 2019                                                  

            Congestion Control based on Forward path Status
                       draft-gwock-rmcat-ccfs-00

Abstract

   This document describes CCFS(Congestion Control based on Forward path
   Status), rate adaptation scheme for interactive real-time media
   applications, such as video conferencing. CCFS manages forward path's
   status based on the estimated three major parameters - serving
   bitrate, queue delay and queue delay by cross traffics. Considering
   only forward path status minimizes the effects of backward path's
   network event such as congestion. It also is free from compatibility
   issues because it defines generalized feedback message and minimizes
   receiver's role.

Status of this Memo

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Copyright and License Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
 

J. Gwock                 Expires March 7, 2019                  [Page 1]
Internet Draft                    CCFS                       August 2018

   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2 Terminology  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4 Detailed Description of CCFS . . . . . . . . . . . . . . . . . .  5
     4.1 CCFS Negotiation . . . . . . . . . . . . . . . . . . . . . .  5
     4.2 Rxer . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
       4.2.1 Feedback message format  . . . . . . . . . . . . . . . .  5
       4.2.2 Handle CCFS control messages . . . . . . . . . . . . . .  7
     4.3 Txer . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
       4.3.1 Constants  . . . . . . . . . . . . . . . . . . . . . . .  7
       4.3.2 Monitored time on txer . . . . . . . . . . . . . . . . .  9
       4.3.3 Forward path bandwidth estimation  . . . . . . . . . . .  9
       4.3.4 Queue delay estimation and find increase pattern . . . . 10
       4.3.5 XQueue delay : Queue delay by external traffics  . . . . 10
       4.3.6 Handle by status . . . . . . . . . . . . . . . . . . . . 11
         4.3.6.1 Control event  . . . . . . . . . . . . . . . . . . . 11
         4.3.6.2 Handle control event by status . . . . . . . . . . . 12
     4.4 CCFS Control messages  . . . . . . . . . . . . . . . . . . . 15
       4.4.1 Update feedback interval . . . . . . . . . . . . . . . . 15
   5 Implement  . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
   6 Security Considerations  . . . . . . . . . . . . . . . . . . . . 16
   7 IANA Considerations  . . . . . . . . . . . . . . . . . . . . . . 16
   8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     8.1 Normative References . . . . . . . . . . . . . . . . . . . . 16
     8.2 Informative References . . . . . . . . . . . . . . . . . . . 16
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17

 

J. Gwock                 Expires March 7, 2019                  [Page 2]
Internet Draft                    CCFS                       August 2018

1 Introduction

   Interactive real-time multi-media applications have a requirement
   that controls their transmitting rate to adapt to bandwidth changes
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