NETEXT Working Group CJ. Bernardos
Internet-Draft A. de la Oliva
Intended status: Informational UC3M
Expires: September 2, 2010 JC. Zuniga
InterDigital Communications, LLC
T. Melia
Alcatel-Lucent Bell Labs
March 1, 2010
Applicability Statement on Link Layer implementation/Logical Interface
over Multiple Physical Interfaces
draft-bernardos-netext-ll-statement-00
Abstract
The NETLMM WG standardized Proxy Mobile IPv6 (PMIPv6). PMIPv6
enables mobile devices to connect to a PMIPv6 domain and roam across
gateways without changing the IP address. PMIPv6 also provides
limited multi-homing support to multi-mode mobile devices.
Proxy mobility is based on the assumption that changes in host IP
stacks are undesirable. However, link layer implementations can hide
the actually used physical interfaces from the IP stack. These
techniques can be used to achieve inter-access handovers or flow
mobility, i.e., the movement of selected flows from one access
technology to another. It is assumed that an IP layer interface can
simultaneously and/or sequentially attach to multiple MAGs (possibly
over multiple media). This document provides an informational
applicability statement that analyzes the issues involved with this
approach and characterizes the contexts in which such use is or is
not appropriate.
Status of this Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Hiding access technology changes . . . . . . . . . . . . . . . 4
3. Applicability Statement . . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
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1. Introduction
Proxy Mobile IPv6 (PMIPv6), specified in [RFC5213], provides network
based mobility management to hosts connecting to a PMIPv6 domain.
PMIPv6 introduces two new functional entities, the Local Mobility
Anchor (LMA) and the Mobile Access Gateway (MAG). The MAG is the
first layer three hop detecting Mobile Node's (MN) attachment and
providing IP connectivity. The LMA is the entity assigning one or
more Home Network Prefixes (HNPs) to the MN and is the topological
anchor for all traffic from/to the MN.
Proxy mobility is based on the assumption that changes in host IP
stacks are undesirable. However, link layer implementations can hide
the actually used physical interfaces from the IP stack. These
techniques can be used to achieve inter-access handovers or flow
mobility, i.e., the movement of selected flows from one access
technology to another. It is assumed that an IP layer interface can
simultaneously and/or sequentially attach to multiple MAGs (possibly
over multiple media). This document provides an informational
applicability statement that analyzes the issues involved with this
approach and characterizes the contexts in which such use is or is
not appropriate.
2. Hiding access technology changes
TO BE COMPLETED
There are several techniques/mechanisms that allow to hide access
technology changes from host IP layer. This section classifies these
existing techniques into a set of generic approaches, according to
their most representative characteristics. This would allow to refer
to these generic mechanisms later in the document, when analyzing
their applicability to inter-tech and flow mobility purposes in
PMIPv6.
So far, we have identified the following generic mechanisms to hide
access technology changes from host IP layer:
o Link layer support: certain link layer technologies are able to
hide physical media changes from the upper layers. For example,
IEEE 802.11 is able to seamlessly change between IEEE 802.11abg
physical modulations without the IP stack even being aware, as the
IEEE 802.11 MAC layer takes care of it, making the mecia change
transparent to the upper layers. Another example ies IEEE 802.3,
that support changing the rate from 10Mbps to 100Mbps and to
1000Mbps. (e.g. EPS solution, IEEE 802.11). While the previous
two changes might seem simple, as they "just" involve physical
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media changes (mainly modulation schemes) between the same two
communication nodes (e.g., STA and AP in IEEE 802.11), there are
other examples, with a more complicated architecture. As an
example of those, we can refer to 3GPP Rel-8. A UE can move
(inter-RAT handover) between GERAN/UTRAN/E-UTRAN, being this
movement transparent to the IP layer at the UE, and also to the
LMA logical component at the PGW. The link layer stack at the UE
(i.e. PDCP and RLC layers), and the GTP between the RAN and the
SGW (which plays the role of inter-3GPP AN mobility anchor) hide
this kind of mobility, which is not visible to the IP layer of the
UE.
o Logical interface: by this name we can group the solutions than
logically group/bond several physical interfaces so they appear to
the upper layers (i.e. IP) as one single interface (where
application sockets bind). Depending on the OS support, it might
be possible to use more than one physical interface at a time --
so the node is simultaneously attached to different media -- or
just to provide a fail-over mode. Controlling the way the
different media is used (simultaneous, sequential attachment, etc)
is not trivial and requires additional intelligence and/or
configuration at the logical interface device driver. An example
of this type of solution is the virtual interface or the bonding
driver.
o Layer 2.5 solution: another potential solution is to add a layer
2.5 on top of the multiple L2 media, that takes care of making
inter-media support transparent.
3. Applicability Statement
TBD.
4. IANA Considerations
This document makes no request of IANA.
5. Security Considerations
TBD
6. Acknowledgments
The research of Carlos J. Bernardos and Antonio de la Oliva leading
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to these results has received funding from the European Community's
Seventh Framework Programme (FP7/2007-2013) under grant agreement n.
214994 (CARMEN project). The work of Carlos J. Bernardos has also
received funding from the Ministry of Science and Innovation of
Spain, under the QUARTET project (TIN2009-13992-C02-01
7. References
7.1. Normative References
[RFC5213] Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K.,
and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008.
7.2. Informative References
[RFC5164] Melia, T., "Mobility Services Transport: Problem
Statement", RFC 5164, March 2008.
Authors' Addresses
Carlos J. Bernardos
Universidad Carlos III de Madrid
Av. Universidad, 30
Leganes, Madrid 28911
Spain
Phone: +34 91624 6236
Email: cjbc@it.uc3m.es
URI: http://www.it.uc3m.es/cjbc/
Antonio de la Oliva
Universidad Carlos III de Madrid
Av. Universidad, 30
Leganes, Madrid 28911
Spain
Phone: +34 91624 8803
Email: aoliva@it.uc3m.es
URI: http://www.it.uc3m.es/aoliva/
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Juan Carlos Zuniga
InterDigital Communications, LLC
Email: JuanCarlos.Zuniga@InterDigital.com
Telemaco Melia
Alcatel-Lucent Bell Labs
Email: Telemaco.Melia@alcatel-lucent.com
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