Predictable Multipath TCP (MPTCP) extension
draft-qian-mptcp-predict-00

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Internet Engineering Task Force                                    Q. Wu
Internet-Draft                                                     H. Li
Intended status: Informational                                  Q. Zhang
Expires: May 4, 2020                                              J. Liu
                                                     Tsinghua University
                                                        November 1, 2019

              Predictable Multipath TCP (MPTCP) extension
                      draft-qian-mptcp-predict-00

Abstract

   Multipath TCP (MPTCP) adds the capability of using multiple paths to
   a regular TCP session, which is quite suitable for integrated network
   scenarios where multiple paths almost always exist.  However, link
   handover and link on-off switching happen frequently in network
   systems that integrate different systems (especially the systems that
   continually move), which defeats the quality of MPTCP connections.
   Information about the link handover and on-off switching in above-
   mentioned scenarios can be predicted in advance, but MPTCP is not
   capable of utilizing the prediction information.  This document
   suggests MPTCP be extended with the capacity of obtaining and
   utilizing the prediction information.  Furthermore, the document
   describes one possible way to enhance MPTCP with prediction
   information, which proposes a modified MPTCP scheduler utilizing link
   on-off prediction information.

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Wu, et al.                 Expires May 4, 2020                  [Page 1]
Internet-Draft         Predictable MPTCP extension         November 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem: How do handover and on-off switching weaken MPTCP? .   4
     3.1.  How Link Handover weakens MPTCP . . . . . . . . . . . . .   4
     3.2.  How Link On-off switching weakens MPTCP . . . . . . . . .   4
   4.  Prediction Information  . . . . . . . . . . . . . . . . . . .   5
     4.1.  Predictability  . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Predictable Information . . . . . . . . . . . . . . . . .   5
   5.  An example: Scheduler Utilizing Prediction Information  . . .   5
     5.1.  Scenario  . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.2.  Modification to Scheduler: How to utilize Prediction
           Information . . . . . . . . . . . . . . . . . . . . . . .   5
     5.3.  Enhancement . . . . . . . . . . . . . . . . . . . . . . .   6
     5.4.  Corresponding extension for path management . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  Informative References  . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Multipath TCP (MPTCP) adds the capability of using multiple paths to
   a regular TCP session [RFC793].  The motivations for this extension
   include increasing throughput, overall resource utilization, and
   resilience to network failure, and these motivations are discussed,
   along with high-level design decisions, as part of the multipath TCP
   architecture [RFC6182].

   In integrated networks that integrate different systems (especially
   the systems that continually move), like Integrated Satellite-
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