Multipath sequence maintenance
draft-amend-iccrg-multipath-reordering-00

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ICCRG Working Group                                             M. Amend
Internet-Draft                                               D. von Hugo
Intended status: Experimental                                         DT
Expires: 8 January 2021                                      7 July 2020

                     Multipath sequence maintenance
               draft-amend-iccrg-multipath-reordering-00

Abstract

   This document discusses the issue of packet re-ordering which occurs
   as a specific problem in multi-path connections without reliable
   transport protocols such as TCP.  The topic is relevant for devices
   connected via multiple accesses technologies towards the network as
   is foreseen e.g. within Access Traffic Selection, Switching, and
   Splitting (ATSSS) service of 3rd Generation Partnership Project
   (3GPP) enabling fixed mobile converged (FMC) scenario.

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Amend & von Hugo         Expires 8 January 2021                 [Page 1]
Internet-Draft       Multipath sequence maintenance            July 2020

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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  State of the Art  . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Scheduling mechanisms . . . . . . . . . . . . . . . . . . . .   6
   5.  Resequencing mechanisms . . . . . . . . . . . . . . . . . . .   6
     5.1.  Passive . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Exact . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Static Expiration . . . . . . . . . . . . . . . . . . . .   7
     5.4.  Adaptive Expiration . . . . . . . . . . . . . . . . . . .   7
     5.5.  Delay Equalization  . . . . . . . . . . . . . . . . . . .   7
     5.6.  Fast Packet Loss Detection  . . . . . . . . . . . . . . .   7
       5.6.1.  Using overall sequencing  . . . . . . . . . . . . . .   7
       5.6.2.  Using per-path sequencing . . . . . . . . . . . . . .   7
   6.  Recovery mechanisms . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  FEC . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Network Coding  . . . . . . . . . . . . . . . . . . . . .   8
   7.  Retransmission mechanisms . . . . . . . . . . . . . . . . . .   8
     7.1.  Fast re-transmission  . . . . . . . . . . . . . . . . . .   8
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Mobile end user devices nowadays are mostly equipped with multiple
   network interfaces allowing to connect to more than one network at a
   time and thus increase data throughput, reliability, coverage and so
   on.  Ideally the user data stream originating from the application at
   the device is split between the available (here: N) paths at the
   sender side and re-assembled at an intermediate aggregation node
   before transmitted to the corresponding host in the network as
   depicted in Figure 1.

Amend & von Hugo         Expires 8 January 2021                 [Page 2]
Internet-Draft       Multipath sequence maintenance            July 2020

                      ------------
                     /            \
          +---------| Access Net 1 |--+
          |         \             /   |
          |          -------------    |
          |          ------------     |
          |         /            \    |
          | +------| Access Net 2 |-+ |
          | |       \            /  | |
          | |        ------------   | |
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