Delay-based Congestion Control for MPTCP
draft-xu-mptcp-congestion-control-05

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Multipath TCP                                                 Mingwei Xu
Internet Draft                                       Tsinghua University
Intended status: Standard Track                                   Yu Cao
Expires: July 2017                                           NDSC, China
                                                             Enhuan Dong
                                                     Tsinghua University
                                                         January 1, 2017

                 Delay-based Congestion Control for MPTCP
                 draft-xu-mptcp-congestion-control-05.txt

Abstract

   This document describes the mechanism of wVegas (weighted Vegas),
   which is a delay-based congestion control for MPTCP. The current
   congestion control algorithm of MPTCP, LIA, achieves only course-
   grained load balancing, since it is based on packet loss event. On
   the contrary, wVegas adopts packet queuing delay as congestion
   signals, thus achieving fine-grained load balancing. Compared with
   loss-based algorithms, wVegas is more sensitive to the changes of
   network congestion and thus achieves more timely traffic shifting and
   quicker convergence. WVegas has been implemented in the Linux Kernel
   and is part of the UCLouvain's MPTCP implementation now.

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Xu, et al.              Expires July 1, 2017                  [Page 1]
Internet-Draft        MPTCP Congestion Control            January 2017

   This Internet-Draft will expire on July 1, 2017.

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Table of Contents

   1. Introduction ................................................ 3
      1.1. Requirements Language................................... 4
      1.2. Terminology ............................................ 4
   2. Weighted Vegas Algorithm..................................... 6
   3. Practical considerations..................................... 8
   4. Discussion .................................................. 9
   5. Security Considerations..................................... 10
   6. IANA Considerations ........................................ 10
   7. References ................................................. 10
      7.1. Normative References................................... 10
      7.2. Informative References................................. 10

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1. Introduction

   Performing congestion control independently on each path cannot
   guarantee the fairness for multipath transportation. So the major
   goal of multipath congestion control is to couple all the subflows
   belonging to a flow in order to achieve both fairness and efficiency.
   The current MPTCP adopts a congestion control algorithm called Linked
   Increases algorithm [RFC6356]. It provides the ability to shift
   traffic from more congested paths to less ones. However, it achieves
   only course-grained load balancing, since it uses the packet losses
   as the signal of network congestion and will shift traffic only after
   the loss event. Other alternative congestion control algorithms, such
   as OLIA [OLIA] or Balia [BALIA], have the same way to judge the
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