Requirements for Distributed Mobility Management
RFC 7333

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Internet Engineering Task Force (IETF)                      H. Chan, Ed.
Request for Comments: 7333                           Huawei Technologies
Category: Informational                                           D. Liu
ISSN: 2070-1721                                             China Mobile
                                                                P. Seite
                                                                  Orange
                                                               H. Yokota
                                                              Landis+Gyr
                                                             J. Korhonen
                                                 Broadcom Communications
                                                             August 2014

            Requirements for Distributed Mobility Management

Abstract

   This document defines the requirements for Distributed Mobility
   Management (DMM) at the network layer.  The hierarchical structure in
   traditional wireless networks has led primarily to centrally deployed
   mobility anchors.  As some wireless networks are evolving away from
   the hierarchical structure, it can be useful to have a distributed
   model for mobility management in which traffic does not need to
   traverse centrally deployed mobility anchors far from the optimal
   route.  The motivation and the problems addressed by each requirement
   are also described.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7333.

Chan, et al.                  Informational                     [Page 1]
RFC 7333                        DMM-Reqs                     August 2014

Copyright Notice

   Copyright (c) 2014 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
   to this document.  Code Components extracted from this document must
   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 ....................................................2
   2. Conventions Used in This Document ...............................4
      2.1. Requirements Language ......................................4
      2.2. Terminology ................................................4
   3. Centralized versus Distributed Mobility Management ..............5
      3.1. Centralized Mobility Management ............................6
      3.2. Distributed Mobility Management ............................7
   4. Problem Statement ...............................................8
   5. Requirements ...................................................10
   6. Security Considerations ........................................16
   7. Contributors ...................................................17
   8. References .....................................................20
      8.1. Normative References ......................................20
      8.2. Informative References ....................................21

1.  Introduction

   In the past decade, a fair number of network-layer mobility protocols
   have been standardized [RFC6275] [RFC5944] [RFC5380] [RFC6301]
   [RFC5213].  Although these protocols differ in terms of functions and
   associated message formats, they all employ a mobility anchor to
   allow a mobile node to remain reachable after it has moved to a
   different network.  Among other tasks that the anchor point performs,
   the anchor point ensures connectivity by forwarding packets destined
   to, or sent from, the mobile node.  It is a centrally deployed
   mobility anchor in the sense that the deployed architectures today
   have a small number of these anchors and the traffic of millions of
   mobile nodes in an operator network is typically managed by the same
   anchor.  Such a mobility anchor may still have to reside in the
   subscriber's provider network even when the subscriber is roaming to

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