A multipath framework for UDP traffic over heterogeneous access networks
draft-amend-tsvwg-multipath-framework-mpdccp-01

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Transport Area Working Group                                    M. Amend
Internet-Draft                                              E. Bogenfeld
Intended status: Informational                          Deutsche Telekom
Expires: January 9, 2020                                    A. Brunstrom
                                                              A. Kassler
                                                     Karlstad University
                                                            V. Rakocevic
                                               City University of London
                                                           July 08, 2019

A multipath framework for UDP traffic over heterogeneous access networks
            draft-amend-tsvwg-multipath-framework-mpdccp-01

Abstract

   More and more of today's devices are multi-homing capable, in
   particular 3GPP user equipment like smartphones.  In the current
   standardization of the next upcoming mobile network generation 5G
   Rel.16, this is especially targeted in the study group Access Traffic
   Steering Switching Splitting [TR23.793].  ATSSS describes the
   flexible selection or combination of 3GPP untrusted access like Wi-Fi
   and cellular access, overcoming the single-access limitation of
   today's devices and services.  Another multi-connectivity scenario is
   the Hybrid Access [I-D.lhwxz-hybrid-access-network-architecture][I-D.
   muley-network-based-bonding-hybrid-access], providing multiple access
   for CPEs, which extends the traditional way of single access
   connectivity at home to dual-connectivity over 3GPP and fixed access.
   A missing piece in the ATSSS and Hybrid Access is the access and path
   measurement, which is required for efficient and beneficial traffic
   steering decisions.  This becomes particularly important in
   heterogeneous access networks with a multitude of volatile access
   paths.  While MP-TCP has been proposed to be used within ATSSS, there
   are drawbacks when being used to encapsulate unreliable traffic as it
   blindly retransmits each lost frame leading to excessive delay and
   potential head-of-line blocking.  A decision for MP-TCP though leaves
   the increasing share of UDP in today's traffic mix
   (<https://arxiv.org/abs/1801.05168>) unconsidered.  In this document,
   a multi-access framework is proposed leveraging the MP-DCCP network
   protocol, which enables flexible traffic steering, switching and
   splitting also for unreliable traffic.  A benefit is the support for
   pluggable congestion control which enables our framework to be used
   either independent or complementary to MP-TCP.

Amend, et al.            Expires January 9, 2020                [Page 1]
Internet-Draft         Multipath framework for UDP             July 2019

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  IP compatible multipath framework based on MP-DCCP  . . . . .   4
   4.  Application and placement . . . . . . . . . . . . . . . . . .   6
   5.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

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