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Versions: 00 01 02 03 04 05                                             
Network Working Group                                             D. Liu
Internet-Draft                                              China Mobile
Intended status: Informational                                   H. Chan
Expires: August 18, 2014                             Huawei Technologies
                                                                 H. Deng
                                                            China Mobile
                                                       February 14, 2014


                        DMM Deployment Scenario
                  draft-liu-dmm-deployment-scenario-00

Abstract

   This document discusses the deployment scenario of distributed
   mobility management.  The purpose of this document is to trigger the
   discussion in the group to understnad the DMM deployment scenario and
   consideration from the operator's perspective.

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
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   This Internet-Draft will expire on August 18, 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
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   include Simplified BSD License text as described in Section 4.e of



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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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   2
   3.  Deployment Scenario and Model of DMM  . . . . . . . . . . . .   2
   4.  Network Function Virtualization Scenario  . . . . . . . . . .   3
   5.  Problem statement of network function virtualization
       deployment model  . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Control and data plane separation . . . . . . . . . . . .   4
     5.2.  Mobility management . . . . . . . . . . . . . . . . . . .   4
   6.  SIPTO deployment scenario . . . . . . . . . . . . . . . . . .   4
   7.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   5
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   12. Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Distributed mobility management aims at solving the centralized
   mobility anchor problems of the tranditional mobility management
   protocol.  The benefit of DMM solution is that the data plane traffic
   does not need to traverse the centralized anchoring point.  This
   document discusses the potential deployment scenario of DMM.  The
   purpose of this document is to help the group to reach consensus
   regarding the deployment model of DMM and then develop the DMM
   solution based on the deployment model.

2.  Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL","SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Deployment Scenario and Model of DMM

   As discussed in the DMM requirement document, the centralized
   mobility management has several drawbacks.  The main problem of the
   centralized mobility management protocols is that all the traffic
   need to anchor to a centralized anchor point.  This approach does not
   cause any problem in current mobile network deployment but in the
   scenario that will be discussed later in this document, centralized




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   mobility management protocols will have many drawbacks and it is
   believed that DMM is more suitable in that scenario.

   The main deployment scenario discussed in this document is divided
   into two types.  The first one is the network function virtualization
   scenario.  In this scenario, the mobile core network's control plane
   function is centralized in the mobile cloud.  Apparently, deploying
   the data plane function also in the same centralized mobile cloud is
   not optimized from the traffic routing's perspective.  Another
   deployment scenario is the SIPTO/LIPA scenario which is discussed in
   3GPP.  In this scenario, DMM can provide optimized traffic offloading
   solution.

4.  Network Function Virtualization Scenario

   This section discusses network function virtualization scenario.


                 Mobile Cloud
                  ...........
                ('             ')
              (                )))
             (((  +-----------+ )))
            ((    |Mobile Core|    )))
            (((   +-----------+   )))
               ('..............')
                                |
                        | IP Transit Network
                    (.........)
                  (           )) MN-Internet communication
                 (           ^ ))
          ^ > > >(           ^  ))> > > > > > > > >
          ^       ((         ^  )                  v
          ^        (.........^.)                   v
          ^ +-------|     |  ^|                    v
          ^ |             |  ^+--------------+     v
          ^ |             |  < <             |     v  MN-MN communication
          ^ |             |    ^             |     v
    +--------------+    +--------------+    +--------------+
    |Access Network|    |Access Network|    |Access Network|
    +--------------+    +--------------+    +--------------+
          ^                    ^                   v
          ^                    ^                   v
      +---------+         +---------+         +---------+
      |   MN    |         |    MN   |         |   MN    |
      +---------+         +---------+         +---------+





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   Figure 1: Network function virtualization deployment architecture

   In this architecture, the mobile core network is located in the cloud
   /data center, which can be the operator's private cloud.  The access
   network is connected through an IP transit network.  The mobile core
   network can run in a virtualized platform in the cloud/datacenter.

5.  Problem statement of network function virtualization deployment
    model

5.1.  Control and data plane separation

   The cloud based mobile core network architecture implies separation
   of the control and data plane.  The control plane is located in the
   cloud and the data plane should be distributed.  Otherwise, all the
   data traffic will go through the cloud which is obviously not
   optimized for the mobile node to mobile node communication.

   For the mobile node to Internet communication, the Internet access
   point is normally located in the metro IP transit network.  In this
   case, the mobile node to Internet traffic should also go through the
   Internet access point instead of the mobile core in the cloud.

   However, in some deployment scenario, the operator may choose to put
   the mobile core cloud in the convergence layer of IP metro network.
   In this case, the Internet access point may co-located with the
   mobile core cloud.  In this case, the mobile node to Internet traffic
   may go through the mobile core cloud.

5.2.  Mobility management

   Since the control plane and data plane are separated and the data
   plane is distributed, traditional mobility management can not meet
   this requirement.

   Distributed mobility management or SDN based mobility management may
   be used in this architecture to meet the traffic routing requirement
   (e.g. MN to MN and MN to Internet traffic should not go through from
   the mobile core cloud.).

6.  SIPTO deployment scenario

   Another deployment scenario is the SIPTO scenario which is discussed
   in 3GPP.  DMM is believed to be able to provide dynamic anchoring.
   It allows the mobile node to have several anchoring points and to
   change the anchoring point according to the requirment of
   application.  In SIPTO scenario, the gateway function is located very
   near to the access network and to the user.  If using current



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   centralized mobility management, the traffic will need to tunnel back
   to the previous anchor point even when the mobile node has changed
   the point of attachment to a new one.

7.  Conclusion

   This document discusses the deployment scenario of DMM.  Two types of
   deployment scenario is discussed in this document.  Further types of
   deployment scenario can be added to this document according to the
   progress of the group's discussion.

8.  Security Considerations

   N/A

9.  IANA Considerations

   N/A

10.  Contributors

11.  Acknowledgements

12.  Normative References

   [IEEE-802.11.2012]
              March 2012.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

Authors' Addresses

   Dapeng Liu
   China Mobile
   No.32 Xuanwumen West Street
   Beijing  100053
   China

   Email: liudapeng@chinamobile.com











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   H Anthony Chan
   Huawei Technologies
   5340 Legacy Dr. Building 3
   Plano, TX  75024
   USA

   Email: h.a.chan@ieee.org


   Hui Deng
   China Mobile
   No.32 Xuanwumen West Street
   Beijing  100053
   China

   Email: denghui@chinamobile.com



































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