DCCP Extensions for Multipath Operation with Multiple Addresses
draft-amend-tsvwg-multipath-dccp-01

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Last updated 2019-03-11
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Transport Area Working Group                                    M. Amend
Internet-Draft                                          Deutsche Telekom
Intended status: Experimental                               A. Brunstrom
Expires: September 12, 2019                                   A. Kassler
                                                     Karlstad University
                                                            V. Rakocevic
                                               City University of London
                                                          March 11, 2019

    DCCP Extensions for Multipath Operation with Multiple Addresses
                  draft-amend-tsvwg-multipath-dccp-01

Abstract

   DCCP communication is currently restricted to a single path per
   connection, yet multiple paths often exist between peers.  The
   simultaneous use of these multiple paths for a DCCP session could
   improve resource usage within the network and, thus, improve user
   experience through higher throughput and improved resilience to
   network failure.

   Multipath DCCP provides the ability to simultaneously use multiple
   paths between peers.  This document presents a set of extensions to
   traditional DCCP to support multipath operation.  The protocol offers
   the same type of service to applications as DCCP and it provides the
   components necessary to establish and use multiple DCCP flows across
   potentially disjoint paths.

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   This Internet-Draft will expire on September 12, 2019.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Multipath DCCP in the Networking Stack  . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  MP-DCCP Concept . . . . . . . . . . . . . . . . . . . . .   3
     1.4.  Differences from Multipath TCP  . . . . . . . . . . . . .   4
     1.5.  Requirements Language . . . . . . . . . . . . . . . . . .   6
   2.  Operation Overview  . . . . . . . . . . . . . . . . . . . . .   6
   3.  MP-DCCP Protocol  . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  Interactions with Middleboxes . . . . . . . . . . . . . . . .   7
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Multipath DCCP (MP-DCCP) is a set of extensions to regular DCCP
   [RFC4340], which enables a transport connection to operate across
   multiple paths simultaneously.  DCCP multipath operations is
   suggested in the context of ongoing 3GPP work on 5G multi-access
   solutions [draft-amend-tsvwg-multipath-framework-mpdccp] and for
   hybrid access networks [draft-lhwxz-hybrid-access-network-
   architecture, draft-muley-network-based-bonding-hybrid-access].  It
   can be applied for load-balancing, seamless session handover and
   aggregation purposes (referred to as steering, switching and
   splitting in 3GPP terminology [3GPP, TR 23.793]).

   This document presents the protocol changes required to add multipath
   capability to DCCP; specifically, those for signaling and setting up

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