Segment Routing IPv6 for Mobile User Plane
draft-ietf-dmm-srv6-mobile-uplane-05

Document Type Active Internet-Draft (dmm WG)
Last updated 2019-07-08
Replaces draft-matsushima-spring-dmm-srv6-mobile-uplane
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DMM Working Group                                          S. Matsushima
Internet-Draft                                                  SoftBank
Intended status: Standards Track                             C. Filsfils
Expires: January 9, 2020                                        M. Kohno
                                                            P. Camarillo
                                                     Cisco Systems, Inc.
                                                                D. Voyer
                                                             Bell Canada
                                                              C. Perkins
                                                               Futurewei
                                                            July 8, 2019

               Segment Routing IPv6 for Mobile User Plane
                  draft-ietf-dmm-srv6-mobile-uplane-05

Abstract

   This document shows the applicability of SRv6 (Segment Routing IPv6)
   to the user-plane of mobile networks.  The network programming nature
   of SRv6 accomplish mobile user-plane functions in a simple manner.
   The statelessness of SRv6 and its ability to control both service
   layer path and underlying transport can be beneficial to the mobile
   user-plane, providing flexibility, end-to-end network slicing and SLA
   control for various applications.  This document describes the SRv6
   mobile user plane behavior and defines the SID functions for that.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 9, 2020.

Matsushima, et al.       Expires January 9, 2020                [Page 1]
Internet-Draft             SRv6-mobile-uplane                  July 2019

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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Predefined SRv6 Functions . . . . . . . . . . . . . . . .   4
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  A 3GPP Reference Architecture . . . . . . . . . . . . . . . .   6
   5.  User-plane behaviors  . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Traditional mode  . . . . . . . . . . . . . . . . . . . .   7
       5.1.1.  Packet flow - Uplink  . . . . . . . . . . . . . . . .   8
       5.1.2.  Packet flow - Downlink  . . . . . . . . . . . . . . .   8
       5.1.3.  IPv6 user-traffic . . . . . . . . . . . . . . . . . .   9
     5.2.  Enhanced Mode . . . . . . . . . . . . . . . . . . . . . .   9
       5.2.1.  Packet flow - Uplink  . . . . . . . . . . . . . . . .  10
       5.2.2.  Packet flow - Downlink  . . . . . . . . . . . . . . .  11
       5.2.3.  IPv6 user-traffic . . . . . . . . . . . . . . . . . .  11
     5.3.  Enhanced mode with unchanged gNB GTP behavior . . . . . .  11
       5.3.1.  Interworking with IPv6 GTP  . . . . . . . . . . . . .  12
       5.3.2.  Interworking with IPv4 GTP  . . . . . . . . . . . . .  15
       5.3.3.  Extensions to the interworking mechanisms . . . . . .  17
   6.  SRv6 SID Mobility Functions . . . . . . . . . . . . . . . . .  18
     6.1.  Args.Mob.Session  . . . . . . . . . . . . . . . . . . . .  18
     6.2.  End.MAP . . . . . . . . . . . . . . . . . . . . . . . . .  18
     6.3.  End.M.GTP6.D  . . . . . . . . . . . . . . . . . . . . . .  19
     6.4.  End.M.GTP6.E  . . . . . . . . . . . . . . . . . . . . . .  19
     6.5.  End.M.GTP4.E  . . . . . . . . . . . . . . . . . . . . . .  20
     6.6.  T.M.GTP4.D  . . . . . . . . . . . . . . . . . . . . . . .  21
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