Mobility Support for IP-Based
Network
Jie Li, University of Tsukuba
Hsiao-Hwa Chen, National Sun Yat-Sen University
IEEE Communications Magazine • October 2005
Professor : Sheau-Ru Tong
Reporter : M9456001 李思儀
M9456002 林濟斌
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Outline
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Abstract
MOBILE IP
MOBILE IPv6
Hierarchy of MAPs
SECURITY REQUIREMENTS
IP MOBILITY SUPPORT WITH WIRELESS
LANS
CONCLUSION
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Abstract
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IP-based wireless networks will become the
core of next-generation mobile networks.
Mobility support for IP-based networks.
This article aims to provide an overview of
various major technical issues of mobility
support for different IP-based networks
including mobile IP
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MOBILE IP
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Mobile IP was designed to provide a way to support
host mobility.
Mobile IP entities:
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Mobile node (MN)
Home agent (HA)
Foreign agent (FA)
Care-of address (CoA)
Collocated CoA
Correspondent node (CN)
Home address
Tunnel
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MOBILE IP (cont.)
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Mobile IP uses two IP addresses
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Fixed home address
CoA for the mobility of an MN
Three major processes
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Agent Discovery
Registration
Tunneling
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ROUTING IN MOBILE IP
Internet
CN
7.Packet from CN to HA
Foreign Network
6.Packet Tunneling
5.Binding ACK
Base Station
Home Agent
4.Binding Update
Foreign Agent
Base Station
Home Network
2.Handoff
Mobile node
(MN)
3.Got CoA
Mobile node
(MN)
1.Got home address
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MOBILE IPv6
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In IPv6, 128-bit addressing is used instead of
the 32-bit addressing in IPv4.
IPv6 is considered as the core protocol for
next-generation IP networks.
Mobile IPv6 has almost the same
terminologies as Mobile IPv4 except for the
absence of the FA.
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Mobile IPv6 routing
IPv6 Network
CN
Foreign Network
5.Packet Tunneling
4.Binding ACK
Home Agent
3.Binding Update
AP
AP
Home Network
2.Got CoA
Mobile node
(MN)
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Hierarchical Mobile IPv6
Router
Internet
Router
CN
Router
Home Agent
Home Network
Mobile anchor point
(MAP)
AP
AP
Mobile node
(MN)
1.Handoff
Mobile
node (MN)
AP 8.Get new LCoA
Mobile
node (MN)
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Hierarchy of MAPs
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Mobile node
(MN)
產生LCoA
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3
4
5
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Mobile node
(MN)
產生 new LCoA
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SECURITY REQUIREMENTS
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In Mobile IP and Mobile IPv6, registration of
the CoA naturally requires authentication.
An algorithm used for the authentication is
known as keyed Message Digest 5(MD5).
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IP MOBILITY SUPPORT WITH
WIRELESS LANS
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WI-FI is a technology currently
dominating all wireless LANs.
802.11a、802.11b、802.11g,and so on.
Address IP mobility support for wireless
LANs, including Wi-Fi and Bluetooth.
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DHCP-Based Mobility in
Wireless LANs
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Mobility support is
implemented through
use of dynamic IP
address allocation
provided by DHCP
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DHCP-Based Mobility in
Wireless LANs cont.
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Wireless LAN access points provide support
for roaming at the data link layer
As MNs roam across subnets, though, there
must be a mechanism at the IP/network layer
handoff
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The Solutions with Mobile IP
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WiMAX
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WiMAX( Worldwide
Interoperability for
Microwave Access,
全球互通的微波存取)
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The difference between Wi-Fi
and WiMAX
Wi-Fi
WiMAX
Range
Small. Suitable
for WLAN
Wide. Suitable
for WMAN
Contention
resolution
By CSMA/CA
and RTS/CTS
Binary
exponential
backoff
Medium Access
Method
CSMA/CA
TDMA
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IP Mobility Support For Cellular and
Heterogeneous Mobile Networks
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2G3G
The aim of the process is to have an all-IP
network architecture to provide high-bit-rate
multimedia services including voice, video,
and data
The IP core network architecture includes the
packet core network for wide area mobility
and bearer services. Ex: Voice over IP ,Video
over IP and Multimedia Messaging
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IP Mobility Support For Cellular and
Heterogeneous Mobile Networks cont.
UMTS
 CDMA2000
 Both networks use tunnels to support user
mobility . However, the 3G networks
including CDMA2000 and UMTS currently
solve their mobility problems at the link layer
(layer 2) only, not in the IP layer (layer 3).
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IP Mobility support for next generation
heterogeneous mobile networks
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CONCLUSION
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According to this paper, we know some issues
about “Mobility Support for IP-Based Networks”
In the future, we wish it will better for “IP mobility
support for next generation heterogeneous
mobile networks”.
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