Network coding and satellites
draft-kuhn-nwcrg-network-coding-satellites-05

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Internet Engineering Task Force                             N. Kuhn, Ed.
Internet-Draft                                                      CNES
Intended status: Informational                            E. Lochin, Ed.
Expires: January 3, 2019                                    ISAE-SUPAERO
                                                            July 2, 2018

                     Network coding and satellites
             draft-kuhn-nwcrg-network-coding-satellites-05

Abstract

   This memo presents the current deployment of network coding in some
   satellite telecommunications systems along with a discussion on the
   multiple opportunities to introduce these techniques at a wider
   scale.

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   This Internet-Draft will expire on January 3, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Kuhn & Lochin            Expires January 3, 2019                [Page 1]
Internet-Draft        Network coding and satellites            July 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  A note on satellite topology  . . . . . . . . . . . . . . . .   4
   3.  Status of network coding in actually deployed satellite
       systems . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Details on the use cases  . . . . . . . . . . . . . . . . . .   6
     4.1.  Two way relay channel mode  . . . . . . . . . . . . . . .   7
     4.2.  Reliable multicast  . . . . . . . . . . . . . . . . . . .   7
     4.3.  Hybrid access . . . . . . . . . . . . . . . . . . . . . .   8
     4.4.  Dealing with varying capacity . . . . . . . . . . . . . .   9
     4.5.  Improving the gateway handovers . . . . . . . . . . . . .  10
     4.6.  Delay/Disruption Tolerant Networks  . . . . . . . . . . .  10
   5.  Discussion on the deployability . . . . . . . . . . . . . . .  11
   6.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  12
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     11.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   Guaranteeing both physical layer robustness and efficient usage of
   the radio resource has been in the core design of SATellite
   COMmunication (SATCOM) systems.  The trade-off often resided in how
   much redundancy a system had to add to cope from link impairments,
   without reducing the good-put when the channel quality is high.
   Generally speaking, enough redundancy is added so as to guarantee a
   Quasi-Error Free transmission; however, there are cases where the
   physical layer could hardly recover the transmission losses (e.g.
   with a mobile user) and layer 2 (or above) re-transmissions induce an
   at least 500 ms delay with a geostationary satellite.  Further
   exploiting network coding schemes at higher OSI-layers is an
   opportunity for releasing constraints on the physical layer and
   improve the performance of SATCOM systems when the physical layer is
   challenged.  We have noticed an active research activity on how
   network coding and SATCOM in the past.  That being said, not much has