Congestion Control based on Forward path Status
draft-gwock-rmcat-ccfs-02

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RMCAT WG                                                        J. Gwock
Internet-Draft                                                    S. Lee
Intended Status: Experimental                                  Line Plus
Expires: February 28, 2020                               August 29, 2019

            Congestion Control based on Forward path Status
                       draft-gwock-rmcat-ccfs-02

Abstract

   This document describes CCFS(Congestion Control based on Forward path
   Status), a rate adaptation scheme for interactive real-time media
   applications, such as video conferencing. CCFS classifies the forward
   paths's status as throttled, competing, probing and default which is
   managed based on estimated parameters - bottleneck bandwidth, queue
   delay and loss ratio. Considering only forward path status minimizes
   influence of backward path's network events such as congestion. It is
   also free from compatibility issues because it defines generalized
   feedback message.

Status of this Memo

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Copyright and License Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
 

Gwock, et al.          Expires February 28, 2020                [Page 1]
Internet Draft                    CCFS                     February 2019

   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 . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
       4.2.1 Feedback message format  . . . . . . . . . . . . . . . .  6
       4.2.2 CCFS feedback message size . . . . . . . . . . . . . . . 11
       4.2.3 Handle CCFS control messages . . . . . . . . . . . . . . 11
     4.3 Txer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
       4.3.1 Constants  . . . . . . . . . . . . . . . . . . . . . . . 12
       4.3.2 Monitoring time on txer  . . . . . . . . . . . . . . . . 13
       4.3.3 Forward path bandwidth estimation  . . . . . . . . . . . 14
       4.3.4 Queue delay estimation and find increase pattern . . . . 15
       4.3.5 Handle by status . . . . . . . . . . . . . . . . . . . . 16
         4.3.5.1 Control event  . . . . . . . . . . . . . . . . . . . 17
         4.3.5.2 Handle control event by status . . . . . . . . . . . 18
     4.4 CCFS Control messages  . . . . . . . . . . . . . . . . . . . 21
       4.4.1 Update preferred feedback interval . . . . . . . . . . . 21
       4.4.2 Update preferred monitoring time . . . . . . . . . . . . 22
   5 Implement  . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
   6 Security Considerations  . . . . . . . . . . . . . . . . . . . . 22
   7 IANA Considerations  . . . . . . . . . . . . . . . . . . . . . . 22
   8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     8.1 Normative References . . . . . . . . . . . . . . . . . . . . 22
     8.2 Informative References . . . . . . . . . . . . . . . . . . . 23
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24

 

Gwock, et al.          Expires February 28, 2020                [Page 2]
Internet Draft                    CCFS                     February 2019

1 Introduction

   Interactive real-time multi-media applications have a requirement
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