5G Session Continuity Support in MPTCP
draft-defoy-5g-session-continuity-support-in-mptcp-00

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Last updated 2018-10-19
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Network Working Group                                          X. de Foy
Internet-Draft                                       U. Olvera-Hernandez
Intended status: Informational               InterDigital Communications
Expires: April 22, 2019                                      U. Chunduri
                                                              Huawei USA
                                                            Oct 19, 2018

                 5G Session Continuity Support in MPTCP
         draft-defoy-5g-session-continuity-support-in-mptcp-00

Abstract

   This document describes how 5G session continuity can affect MPTCP.
   For now only potential performance issues are identified.  This
   document aims to document discussions that took place at the IETF on
   this subject, to facilitate future deployment of MPTCP over 5G.

Status of This Memo

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   This Internet-Draft will expire on April 22, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction and Goal . . . . . . . . . . . . . . . . . . . .   2
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  5G Will Not Hide Session Continuity from MPTCP Any Longer   2
     2.2.  Detailed Issues . . . . . . . . . . . . . . . . . . . . .   3
   3.  Potential Solutions . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Alternative #1: No Change to MPTCP Protocol . . . . . . .   4
     3.2.  Alternative #2: Explicit signaling of Session Continuity
           Type  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Alternative #3: Client-Driven Handling  . . . . . . . . .   6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Informative References  . . . . . . . . . . . . . . . . . . .   7
   Appendix A.  IP Address Session Continuity Service Type . . . . .   8
   Appendix B.  Overview of 5G Session and Service Continuity  . . .   8
     B.1.  SSC mode 1  . . . . . . . . . . . . . . . . . . . . . . .   9
     B.2.  SSC mode 2  . . . . . . . . . . . . . . . . . . . . . . .   9
     B.3.  SSC mode 3  . . . . . . . . . . . . . . . . . . . . . . .   9
   Appendix C.  Example of MPTCP Client Implementations Behavior
                with 5G SSC  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction and Goal

   MPTCP [RFC6824] is being deployed and widely adopted in today's smart
   devices, which typically have multiple network interfaces such as
   Cellular and Wifi.  It provides reliability, bandwidth aggregation
   capability, and handover efficiency.

   This document describes how 5G session continuity can affect MPTCP.
   For now only potential performance issues are identified.  This
   document aims to document discussions that took place at the IETF on
   this subject, to facilitate future deployment of MPTCP over 5G.

2.  Problem Statement

2.1.  5G Will Not Hide Session Continuity from MPTCP Any Longer

   In 4G [_3GPP.23.401], a single long-term IP address was provided to
   the end device.  Session continuity was performed through a fixed
   anchor, and effectively hidden from MPTCP.

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   In 5G, session continuity won't always be hidden from MPTCP.  3
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