An Improvement of ECN to Enhance TCP Fairness Performance
draft-sun-tcpm-ecn-improvement-00

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INTERNET-DRAFT                                                     M.Sun
Intended Status: Standard Track                      HUAWEI Technologies
Expires: May 4, 2017                                    October 31, 2016

       An Improvement of ECN to Enhance TCP Fairness Performance
                   draft-sun-tcpm-ecn-improvement-00

Abstract

   This document describes TCP fairness performance enhancement scheme
   by use of two parameters congestion degree and link idle rate. It
   uses IP header flag reserved field and ECN 2 bits field to form a new
   IP congestion and Spare Flag (ICSF) and uses 3bits of reserved bits
   in the TCP header to compose the TCP Congestion and Spare Flag (TCSF)
   field. This method identifies the congestion and link idle status to
   make sure that every TCP flow can receive the same degree of fairness
   and can improve TCP send window adjustment speed and transmission
   efficiency.  

Status of this Memo

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

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Copyright and License Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors. All rights reserved.
 

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INTERNET DRAFT           An Improvement of ECN          October 31, 2016

   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
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Generic ECN Overview . . . . . . . . . . . . . . . . . . . . .  3
     2.1  Detailed information of ECN . . . . . . . . . . . . . . . .  3
     2.2  Shortage  . . . . . . . . . . . . . . . . . . . . . . . . .  6
   3  TCP Fairness Performance Improvement  . . . . . . . . . . . . .  6
     3.1  Congestion Degree . . . . . . . . . . . . . . . . . . . . .  6
     3.2  Idle Rate . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.3  Full Link Congestion and Idle Information . . . . . . . . .  6
     3.4  Send Window Adjusting Method  . . . . . . . . . . . . . . .  7
       3.4.1  Using the Worst Congestion Degree to Adjust Sending
              Window  . . . . . . . . . . . . . . . . . . . . . . . .  7
       3.4.2  Using the Worst Idle Rate to Adjust Sending Window  . .  7
     3.5  IP Option Extend  . . . . . . . . . . . . . . . . . . . . .  8
       3.5.1  Congestion Degree IP Extend . . . . . . . . . . . . . .  8
       3.5.2  Idle Rate IP Extend . . . . . . . . . . . . . . . . . .  8
   4  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     4.1  Normative References  . . . . . . . . . . . . . . . . . . .  8
     4.2  Informative References  . . . . . . . . . . . . . . . . . .  9
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  9

 

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INTERNET DRAFT           An Improvement of ECN          October 31, 2016

1  Introduction

   ECN (Explicit Congestion Notification)[RFC3168]is an extension to the
   Internet Protocol and to the Transmission Control Protocol and is
   defined in RFC 3168. ECN allows end-to-end notification of network
   congestion without dropping packets. ECN is an optional feature that
   may be used between two ECN-enabled endpoints when the underlying
   network infrastructure also supports it. An ECN-aware router may set
   a mark in the IP header instead of dropping a packet in order to
   signal impending congestion. The receiver of the packet echoes the
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