Enhancing Transport Protocols over Satellite Networks
draft-jones-tsvwg-transport-for-satellite-00

Document Type Active Internet-Draft (individual)
Authors Tom Jones  , Gorry Fairhurst  , Nicolas Kuhn  , John Border  , Stephan Emile 
Last updated 2021-02-22
Replaces draft-kuhn-quic-4-sat
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Internet Engineering Task Force                                 T. Jones
Internet-Draft                                              G. Fairhurst
Intended status: Informational                    University of Aberdeen
Expires: 26 August 2021                                          N. Kuhn
                                                                    CNES
                                                               J. Border
                                             Hughes Network Systems, LLC
                                                              E. Stephan
                                                                  Orange
                                                        22 February 2021

         Enhancing Transport Protocols over Satellite Networks
              draft-jones-tsvwg-transport-for-satellite-00

Abstract

   IETF transport protocols such as TCP, SCTP and QUIC are designed to
   function correctly over any network path.  This includes networks
   paths that utilise a satellite link or network.  While transport
   protocols function, the characteristics of satellite networks can
   impact performance when using the defaults in standard mechanisms,
   due to the specific characteristics of these paths.

   RFC 2488 and RFC 3135 describe mechanisms that enable TCP to more
   effectively utilize the available capacity of a network path that
   includes a satellite system.  Since publication, both application and
   transport layers and satellite systems have evolved.  Indeed, the
   development of encrypted protocols such as QUIC challenges currently
   deployed solutions, for satellite systems the capacity has increased
   and commercial systems are now available that use a range of
   satellite orbital positions.

   This document describes the current characterises of common satellite
   paths and describes considerations when implementing and deploying
   reliable transport protocols that are intended to work efficiently
   over paths that include a satellite system.  It discusses available
   network mitigations and offers advice to designers of protocols and
   operators of satellite networks.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute

Jones, et al.            Expires 26 August 2021                 [Page 1]
Internet-Draft      Internet Transport for Satellite       February 2021

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on 26 August 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Satellite Systems . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Geosynchronous Earth Orbit (GEO)  . . . . . . . . . . . .   6
     2.2.  Low Earth Orbit (LEO) . . . . . . . . . . . . . . . . . .   7
     2.3.  Medium Earth Orbit (MEO)  . . . . . . . . . . . . . . . .   7
     2.4.  Hybrid Network Paths  . . . . . . . . . . . . . . . . . .   7
     2.5.  Convergence with Mobile Cellular  . . . . . . . . . . . .   8
   3.  Satellite System Characteristics  . . . . . . . . . . . . . .   8
     3.1.  Impact of Delay . . . . . . . . . . . . . . . . . . . . .  10
       3.1.1.  Larger Bandwidth Delay Product  . . . . . . . . . . .  10
       3.1.2.  Variable Link Delay . . . . . . . . . . . . . . . . .  10
       3.1.3.  Impact of delay on protocol feedback  . . . . . . . .  10
     3.2.  Intermittent connectivity . . . . . . . . . . . . . . . .  11
   4.  On-Path Mitigations . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Link-Level Forward Error Correction and ARQ . . . . . . .  11
     4.2.  PMTU Discovery  . . . . . . . . . . . . . . . . . . . . .  11
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