One document matched: draft-chan-dmm-distributed-mobility-anchoring-04.txt
Differences from draft-chan-dmm-distributed-mobility-anchoring-03.txt
DMM H. Chan
Internet-Draft Huawei Technologies
Intended status: Informational J. Lee
Expires: January 4, 2016 Sangmyung University
S. Jeon
Instituto de Telecomunicacoes
July 3, 2015
Distributed Mobility Anchoring
draft-chan-dmm-distributed-mobility-anchoring-04
Abstract
This document defines the mobility management protocol solutions in
the context of a distributed mobility management deployment. Such
solutions consider the problem of assigning a mobility anchor and a
gateway at the initiation of a flow. In addition, the mid-session
switching of the mobility anchor in a distributed mobility management
environment is considered.
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 4, 2016.
Copyright Notice
Copyright (c) 2015 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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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 . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 3
3. IP address anchored in current network of attachment . . . . . 5
3.1. Changing to the new IP address . . . . . . . . . . . . . . 5
3.2. Moving the IP address anchor to the new network . . . . . 6
4. IP address anchored not in current network of attachment . . . 7
4.1. Keeping the IP address from a prior network . . . . . . . 8
4.1.1. Employing indirection of a flow . . . . . . . . . . . 9
4.1.2. Changing the indirection path of a flow . . . . . . . 11
5. Security Considerations . . . . . . . . . . . . . . . . . . . 12
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.1. Normative References . . . . . . . . . . . . . . . . . . . 13
8.2. Informative References . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
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1. Introduction
A key requirement in distributed mobility management [RFC7333] is to
enable traffic to avoid traversing single mobility anchor far from
the optimal route. Recent developments in research and
standardization with respect to future deployment models call for far
more flexibility in network function operation and management. For
example, the work on service function chaining at the IETF (SFC WG)
has already identified a number of use cases for data centers.
Although the work in SFC is not primarily concerned with mobile
networks, the impact on IP-based mobile networks is not hard to see
as by now most hosts connected to the Internet do so over a wireless
medium. For instance, as a result of a dynamic re-organization of
service chain a non-optimal route between mobile nodes may arise if
one relies solely on centralized mobility management. This may also
occur when the mobile node has moved such that both the mobile node
and the correspondent node are far from the mobility anchor via which
the traffic is routed.
Recall that distributed mobility management solutions do not make use
of centrally deployed mobility anchor [Paper-Distributed.Mobility].
As such, a flow SHOULD be able to have its traffic changing from
traversing one mobility anchor to traversing another mobility anchor
as the mobile node moves, or when changing operation and management
(OAM) requirements call for mobility anchor switching, thus avoiding
non-optimal routes. This draft proposes distributed mobility
anchoring solutions.
2. Conventions and Terminology
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].
All general mobility-related terms and their acronyms used in this
document are to be interpreted as defined in the Mobile IPv6 base
specification [RFC6275], the Proxy Mobile IPv6 specification
[RFC5213], and the DMM current practices and gap analysis [RFC7429].
This includes terms such as mobile node (MN), correspondent node
(CN), home agent (HA), home address (HoA), care-of-address (CoA),
local mobility anchor (LMA), and mobile access gateway (MAG).
In addition, this document uses the following term:
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Home network of an application session (or of an HoA): the network
that has allocated the IP address (HoA) used for the session
identifier by the application running in an MN. An MN may be
running multiple application sessions, and each of these sessions
can have a different home network.
IP address anchoring: An IP address, i.e., Home Address (HoA), or
prefix, i.e., Home Network Prefix (HNP) allocated to a mobile node
is topologically anchored to a node when the anchor node is able
to advertise a connected route into the routing infrastructure for
the allocated IP prefix.
Internetwork Location Management (LM) function: managing and keeping
track of the internetwork location of an MN. The location
information may be a binding of the IP advertised address/prefix,
e.g., HoA or HNP, to the IP routing address of the MN or of a node
that can forward packets destined to the MN. It is a control
plane function.
In a client-server protocol model, location query and update
messages may be exchanged between a Location Management client
(LMc) and a Location Management server (LMs).
With separation of control plane and data plane, this function may
reside in a control plane anchor.
It may be distributed or centralized.
It may be a function in the control plane node, control plane
anchor, or mobility controller.
Forwarding Management (FM) function: packet interception and
forwarding to/from the IP address/prefix assigned to the MN, based
on the internetwork location information, either to the
destination or to some other network element that knows how to
forward the packets to their destination.
This function may be used to achieve indirection. With separation
of control plane and data plane, FM may split into a FM function
in the data plane (FM-DP) and a FM function in the control plane
(FM-CP).
FM-DP may be distributed with distributed mobility management. It
may be a function in a data plane node or control plane node.
FM-CP may be distributed or centralized. It may be a function in
a control plane node, control plane anchor or mobility controller.
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Security Management (SM) function: The security management function
controls security mechanisms/protocols providing access control,
integrity, authentication, authorization, confidentiality, etc.
for the control plane and data plane.
This function resides in all nodes such as control plane anchor,
data plane anchor, mobile node, and correspondent node.
3. IP address anchored in current network of attachment
The IP address at MN's side of a flow may be anchored at the access
router to which the MN is attached.
For example, when an MN attaches to a network (Net1) or moves to a
new network (Net2), it is allocated an IP prefix from that network.
It configures from this prefix an IP address which is typically a
dynamic IP address. It then uses this IP address when it starts a
new flow. Packets to the MN in this flow are simply forwarded
according to the forwarding table.
In this example, the flow may have terminated before the MN moves to
a new network. Otherwise, the flow may close and then restart using
a new IP address configured in the new network.
Net1 Net2
+--------------+ +--------------+
|FM-DP: | |FM-DP: |
|AR1 | |AR2 |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+--------------+ +--------------+
|MN(IP1): | or |MN(IP2): |
|flow(IP1,...) | |flow(IP2,...) |
+--------------+ +--------------+
Figure 1. IP address anchored in network of attachment. MN is
attached to AR1 in Net1 where it has initiated a flow using IP1 or
has moved to AR2 in Net2 where it initiates a new flow using IP2.
3.1. Changing to the new IP address
With the MN in the example in Section 3 it may be desirable to change
to a flow using the new IP address configured in the new network.
The packets of this flow may then follow the forwarding table without
requiring IP layer mobility support. Yet such a change in flow may
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be using a higher layer mobility support which is not in the scope of
this document to change the IP address of the flow.
The security management function in the anchor node at a new network
must allow to assign a valid IP prefix/address to a mobile node.
Net1 Net2
+--------------+ +--------------+
|FM-DP: | |FM-DP: |
|AR1 | |AR2 |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+..............+ +--------------+
.MN(IP1): . move |MN(IP2): |
.flow(IP1,...) . =======> |flow(IP2,...) |
+..............+ +--------------+
Figure 2. Changing to the new IP address. MN running a flow using
IP1 in Net1 changes to running a flow using IP2 in Net2.
3.2. Moving the IP address anchor to the new network
The IP address anchor may move without changing the IP address of the
flow.
Net1 Net2
+..............+ +--------------+
.FM-DP: . |FM-DP: |
.AR1 . move |AR2 |
.RA(IP1) . =======> |RA(IP2,IP1) |
+..............+ +--------------+
+..............+ +--------------+
.MN(IP1): . move |MN(IP2,IP1): |
.flow(IP1,...) . =======> |flow(IP1,...) |
+..............+ +--------------+
Figure 3. Moving the IP address anchor to the new network. MN with
flow using IP1 in Net1 continues to run the flow using IP1 as it
moves to Net2.
As an MN with an ongoing session moves to a new network, the flow may
preserve session continuity by moving the original IP address to the
new network. An example is in the use of BGP UPDATE messages to
change the forwarding table entries as described in
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[I-D.mccann-dmm-flatarch] and also for 3GPP Evolved Packet Core (EPC)
network in [I-D.matsushima-stateless-uplane-vepc]. Another example
is in the case where Net1 and Net2 both belong to the same operator
network with separation of control and data planes
([I-D.liu-dmm-deployment-scenario] and
[I-D.matsushima-stateless-uplane-vepc]), where the controller may
send to the switches/routers the updated information of the
forwarding tables with the IP addressing anchoring of the original IP
prefix/address at AR1 moved to AR2 in the new network. Then the IP
anchor node which was advertising the prefix in the original network
will need to move to the new network. As the anchor node in the new
network advertises the prefix of the original IP address in the new
network, the forwarding tables will be updated so that packets of the
flow will be forwarded according to the updated forwarding tables.
The security management function in the anchor node at a new network
must allow to assign the original IP prefix/address used by the
mobile node at the previous (original) network. As the assigned
original IP prefix/address is to be used in the new network, the
security management function in the anchor node must allow to
advertise the prefix of the original IP address and also allow the
mobile node to send and receive data packets with the original IP
address.
The security management function in the mobile node must allow to
configure the original IP prefix/address used at the previous
(original) network when the original IP prefix/address is assigned by
the anchor node in the new network. The security management function
in the mobile node also allow to use the original IP address for the
previous flow in the new network.
4. IP address anchored not in current network of attachment
The IP address at MN's side of a flow may be anchored not at the
access router to which the MN is attached.
An example when an MN moves to a new network is as follows. The MN
has an ongoing session which was initialized in a prior network
(Net1) of attachment using an IP address belonging to the network
where it was initialized as described in Section 3. When the flow is
unable to change its IP address it may continue to use its original
IP address so that the IP address is anchored not in the current
network of attachment but in the network where the original IP
address belongs. Mobility support is needed to enable the flow to
use this original IP address.
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Net1 Net2
+--------------+ +--------------+
|FM-DP: | |FM-DP: |
|AR1 | |AR2 |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+--------------+
|MN(IP2): |
|flow(IP1,...) |
+--------------+
Figure 4. IP address anchored not in network of attachment. MN
attached to AR2 in Net2 has a flow(IP1,...) using IP1, which belongs
to Net1.
4.1. Keeping the IP address from a prior network
After the MN moves with an ongoing session to the new network (Net2),
it obtains a new IP address or prefix from the new network. However,
the ongoing session which was initialized in a prior network of
attachment is using an IP address belonging to the network where it
was initialized as described in Section 3.1. IP mobility is needed
to use the original IP address for session continuity.
Net1 Net2
+--------------+ +--------------+
|FM-DP: | |FM-DP: |
|AR1 |<------------------------------------>|AR2 |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+..............+ +--------------+
.MN(IP1): . move |MN(IP1,IP2): |
.flow(IP1,...) . =======> |flow(IP1,...) |
+..............+ +--------------+
Figure 5. Keeping the IP address from a prior network. MN with
ongoing flow using IP1 in Net1 has moved to Net2 and the flow needs
to continue using IP1 to preserve session continuity.
The use of IP address belonging to the network of attachment whenever
a new flow is initiated as described in Section 3 and to keep the IP
address as the MN moves to a new network are described in
[I-D.seite-dmm-dma].
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4.1.1. Employing indirection of a flow
As an MN with an ongoing session moves to a new network, the flow may
use the original IP address for session continuity by using
indirection. Here the location management information may be kept as
a binding of the original IP address to a new forwarding address,
whereas the Forwarding management function may then use this binding
to forward the flow.
In Figure 6, the location management information kept in the original
network is the binding of the original IP address to an IP address in
the new network.
Net3
+--------------+
|AR3 |
|RA(IPcn) |
/+--------------+
Net1 / +--------------+ Net2
+--------------+ / |CN(IPcn): flow| +--------------+
|FM-CP: | / |(IPcn,IP1,...)| |FM-CP: |
|flow(IP1,...)-| / +--------------+ |flow(IP1,...)-|
|AR1<-->AR2 | / |AR1<-->AR2 |
| | / | |
|LM:IP1<->IPar2| / |LM:IP1<->IPar2|
|--------------| / |--------------|
|FM-DP: |<- |FM-DP: |
|AR1 | ------------------------------------>|AR2(IPar2) |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+..............+ +--------------+
.MN(IP1): . move |MN(IP1,IP2): |
.flow(IP1,...) . =======> |flow(IP1,...) |
+..............+ +--------------+
Figure 6. Employing indirection of a flow. After MN has moved from
Net1 to Net2, Location Information function in Net1 keeps a binding
of IP1 to IP of AR2, and Routing Management function in Net1 forwards
the packets of the flow(IP1,...) to Net2.
The packets of the flow(IP1, IPcn, ...) from the CN to the MN will
first be forwarded to AR1 in the original network. Here, using the
binding of IP1 to an IP address in the new network, the forwarding
management function may forward these packets to the new network such
as by encapsulating them with a header destined to the new network.
In a host-based mobility management solution such as
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[I-D.bernardos-dmm-cmip] and [Paper-Distributed.Mobility], the
address in the new network may be the MN itself.
In a network-based mobility management solution such as
[I-D.bernardos-dmm-pmip], [I-D.sarikaya-dmm-for-wifi],
[Paper-Distributed.Mobility] and [Paper-Distributed.Mobility.PMIP],
the address in the new network may be an access router to which the
MN is attached in the new network. The access router may then
forward the packet to the MN at L2, which may use Software-Defined
Networking as described in [I-D.sarikaya-dmm-for-wifi].
In general, indirection is invoked only when needed. The flow can
use the IP address belonging to the network of attachment where the
flow is initialized as described in [I-D.seite-dmm-dma].
In distributed mobility management, the FM-DP may be distributed.
The LM and FM-CP may each be distributed and collocate with FM-DP.
The may also be centralized. Examples
[I-D.yhkim-dmm-enhanced-anchoring] include: (1) Distribute LM and
FM-CP, and collocate them with FM-DP, where the IP prefix allocation
may be distributed or centralized; (2) As in (1) but with LM
centralized; (3) As in (2) but with the IP prefix allocation function
centralized.
The security management function in the IP anchor node must ensure
that the forwarding management function establishes secure forwarding
with a relevant IP anchor node (e.g., forwarding between AR1 and
AR2). The security management function in the current IP anchor node
(e.g., AR2) must allow the mobile node to receive or send data
packets with an IP address configured at a prior network of
attachment of the mobile node. Note that nowadays access networks
deploy ingress filtering so that the mobile node may not receive or
send data packets with the previously configured IP address without
the security management function's interaction with ingress
filtering.
The security management function in the mobile node must allow to use
the previous IP address for the associated flow in the new network.
The security management functions in the end communication nodes
(i.e., mobile node and correspondent node) may be used to ensure a
secure data plane between them.
For establishments of secure forwarding between IP anchor nodes and
secure data plane between the mobile node and correspondent node,
existing security protocols such as IKE, IPsec, TLS may be invoked by
the security management function.
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4.1.2. Changing the indirection path of a flow
Forwarding the packets of an ongoing session from CN's network via
the original network to MN's new network is not necessarily optimal.
The route can be more direct by forwarding these packets directly
from CN's network to MN's new network.
Here, the location information in the original network may be copied
to CN's network. The packets of the flow(IP1, IPcn, ...) from the CN
to the MN are first intercepted at the access router of CN. Then
using the binding of IP1 to an IP address in the new network, the
forwarding management function in CN's network may forward these
packets directly to the new network
([Paper-Distributed.Mobility.PMIP]) such as by encapsulating them
with a header destined to the new network.
To change the indirection of a flow, the relevant context with regard
to MN should be delivered from AR1 in Net1 to AR3 (CN's anchor) in
Net3 (CN's network), while AR2 should be notified of the change of
indirection to receive packets directly forwarded by AR3. Existing
IP mobility signaling messages such as Proxy Binding Update (PBU) and
Proxy Binding Acknowledgment (PBA) can be used for the both
communications with as little option extensions as possible. When a
packet from the CN has reached AR3, AR3 encapsulates the packet with
a tunnel header specified with IP address of CN's anchor as outer
source IP and AR2's IP address as outer destination IP. For
transparent packet delivery operation in the perspective od AR2, CN's
anchor needs to forward packets encapsulated with a tunnel header
specified with AR1's IP address as outer source IP and AR2's IP
address as outer destination IP.
The security management function in the IP anchor node must ensure
that the forwarding management function establishes secure forwarding
with a relevant IP anchor node (e.g., forwarding between AR2 and AR3)
during mis-session. The security management function in the current
IP anchor node (e.g., AR2) must allow the mobile node to receive or
send data packets with an IP address configured at a prior network of
attachment of the mobile node.
The security management function in the mobile node must allow to use
the previous IP address for the associated flow in the new network.
The security management functions in the end communication nodes
(i.e., mobile node and correspondent node) may be used to ensure a
secure data plane between them during mis-session.
For establishments of secure forwarding between IP anchor nodes and
secure data plane between the mobile node and correspondent node,
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existing security protocols such as IKE, IPsec, TLS may be invoked by
the security management function.
Net3
+--------------+
|FM-CP: |
|flow(IP1,...)-|
|AR3<-->AR2 |
y..>| |
p. |LM:IP1<->IPar2|
o. |--------------|
c. |FM-DP: |
. |AR3 |
. |RA(IPcn) |
. +--------------+\
Net1 . +--------------+ \ Net2
+--------------+. |CN(IPcn): flow| \ +--------------+
|FM-CP: | |(IPcn,IP1,...)| \ |FM-CP: |
|flow(IP1,...)-| +--------------+ \ |flow(IP1,...)-|
|AR1<-->AR2 | \ |AR3<-->AR2 |
| | \ | |
|LM:IP1<->IPar2| \ |LM:IP1<->IPar2|
|--------------| \ |--------------|
|FM-DP: | ->|FM-DP: |
|AR1 | |AR2(IPar2) |
|RA(IP1) | |RA(IP2) |
+--------------+ +--------------+
+..............+ +--------------+
.MN(IP1): . move |MN(IP1,IP2): |
.flow(IP1,...) . =======> |flow(IP1,...) |
+..............+ +--------------+
Figure 7. Changing the indirection path of a flow. Location
Information function and Routing Management function in Net2 are
copied to Net3, so that the Location Information function in Net3
keeps a binding of IP1 to IP of AR2, and the Routing Management
function in Net3 forwards the packets of the flow(IP1,...) to Net2.
5. Security Considerations
TBD
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6. IANA Considerations
This document presents no IANA considerations.
7. Contributors
This document is an attempt to harmonize the different distributed
mobility solutions in a number of other drafts. These drafts cited
in this document are the work of their many authors/co-authors.
While some of them have taken the work to jointly write this
document, others have contributed at least indirectly by writing
these drafts. The latter include Carlos J. Bernardos, Philippe
Bertin, Hui Deng, Fabio Giust, Dapeng Liu, Satoru Matushima, Peter
McCann, Antonio de la Oliva, Behcet Sarikaya, Pierrick Seite, Li Xue,
Ryuji Wakikawa, and Younghan Kim.
Valuable comments have also been received from John Kaippallimil and
ChunShan Xiong.
8. References
8.1. Normative References
[I-D.bernardos-dmm-cmip]
Bernardos, C., Oliva, A., and F. Giust, "An IPv6
Distributed Client Mobility Management approach using
existing mechanisms", draft-bernardos-dmm-cmip-03 (work in
progress), March 2015.
[I-D.bernardos-dmm-pmip]
Bernardos, C., Oliva, A., and F. Giust, "A PMIPv6-based
solution for Distributed Mobility Management",
draft-bernardos-dmm-pmip-04 (work in progress),
March 2015.
[I-D.liu-dmm-deployment-scenario]
Liu, V., Chan, A., and H. Deng, "Distributed mobility
management deployment scenario and architecture",
draft-liu-dmm-deployment-scenario-03 (work in progress),
March 2015.
[I-D.matsushima-stateless-uplane-vepc]
Matsushima, S. and R. Wakikawa, "Stateless user-plane
architecture for virtualized EPC (vEPC)",
draft-matsushima-stateless-uplane-vepc-04 (work in
progress), March 2015.
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[I-D.mccann-dmm-flatarch]
McCann, P., "Authentication and Mobility Management in a
Flat Architecture", draft-mccann-dmm-flatarch-00 (work in
progress), March 2012.
[I-D.sarikaya-dmm-for-wifi]
Sarikaya, B. and L. Xue, "Distributed Mobility Management
Protocol for WiFi Users in Fixed Network",
draft-sarikaya-dmm-for-wifi-02 (work in progress),
May 2015.
[I-D.seite-dmm-dma]
Seite, P., Bertin, P., and J. Lee, "Distributed Mobility
Anchoring", draft-seite-dmm-dma-07 (work in progress),
February 2014.
[I-D.yhkim-dmm-enhanced-anchoring]
Kim, Y. and S. Jeon, "Enhanced Mobility Anchoring in
Distributed Mobility Management",
draft-yhkim-dmm-enhanced-anchoring-01 (work in progress),
March 2015.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5213] Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K.,
and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008.
[RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
Bierman, "Network Configuration Protocol (NETCONF)",
RFC 6241, June 2011.
[RFC6275] Perkins, C., Johnson, D., and J. Arkko, "Mobility Support
in IPv6", RFC 6275, July 2011.
[RFC7333] Chan, H., Liu, D., Seite, P., Yokota, H., and J. Korhonen,
"Requirements for Distributed Mobility Management",
RFC 7333, August 2014.
[RFC7429] Liu, D., Zuniga, JC., Seite, P., Chan, H., and CJ.
Bernardos, "Distributed Mobility Management: Current
Practices and Gap Analysis", RFC 7429, January 2015.
8.2. Informative References
[Paper-Distributed.Mobility]
Lee, J., Bonnin, J., Seite, P., and H. Chan, "Distributed
IP Mobility Management from the Perspective of the IETF:
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Motivations, Requirements, Approaches, Comparison, and
Challenges", IEEE Wireless Communications, October 2013.
[Paper-Distributed.Mobility.PMIP]
Chan, H., "Proxy Mobile IP with Distributed Mobility
Anchors", Proceedings of GlobeCom Workshop on Seamless
Wireless Mobility, December 2010.
[Paper-Distributed.Mobility.Review]
Chan, H., Yokota, H., Xie, J., Seite, P., and D. Liu,
"Distributed and Dynamic Mobility Management in Mobile
Internet: Current Approaches and Issues", February 2011.
Authors' Addresses
H Anthony Chan
Huawei Technologies
5340 Legacy Dr. Building 3
Plano, TX 75024
USA
Email: h.a.chan@ieee.org
Jong-Hyouk Lee
Sangmyung University
708 Hannuri Building
Cheonan 330-720
Korea
Email: jonghyouk@smu.ac.kr
Seil Jeon
Instituto de Telecomunicacoes
Campus Universitario de Santiago
Aveiro 3810-193
Portugal
Email: seiljeon@av.it.pt
Chan, et al. Expires January 4, 2016 [Page 15]
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