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Mobility Support for IP-Based Network

Professor : Sheau-Ru Tong Reporter : M9456001 李思儀

M9456002 林濟斌

IEEE Communications Magazine • October 2005

Jie Li, University of TsukubaHsiao-Hwa Chen, National Sun Yat-Sen University

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Outline

Abstract MOBILE IP MOBILE IPv6 Hierarchy of MAPs SECURITY REQUIREMENTS IP MOBILITY SUPPORT WITH WIRELESS

LANS CONCLUSION

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Abstract

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 Mobile IP was designed to provide a way to support

host mobility. Mobile IP entities:

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.)

Mobile IP uses two IP addresses Fixed home address CoA for the mobility of an MN

Three major processes Agent Discovery Registration Tunneling

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ROUTING IN MOBILE IP

Mobile node (MN)

Home Agent

Foreign Agent

Foreign Network

Base StationBase Station

InternetCN

Home Network

Mobile node (MN)

1.Got home address

2.Handoff 3.Got CoA

4.Binding Update

5.Binding ACK

6.Packet Tunneling7.Packet from CN to HA

8.ACK

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MOBILE IPv6

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

Mobile node (MN)

Home Agent

Foreign Network

APAP

IPv6 Network

Home Network

CN

1.Handoff

2.Got CoA

3.Binding Update

4.Binding ACK

5.Packet Tunneling

6.Binding Update

7.Packet from CN to MN

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Hierarchical Mobile IPv6

Router

Mobile anchor point (MAP)

Home Agent

Mobile node (MN)

AP

AP AP

Mobile node (MN)

Mobile node (MN)

Router

CNRouter

Internet

Home Network

1.Handoff

2.Registration LCoA

3.Registration RCoA

4.Packet tunneling5.Registration RCoA

6.Packet from CN to MN

7.Handoff

8.Get new LCoA

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Hierarchy of MAPs

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Mobile node (MN)

產生LCoA

Mobile node (MN)

產生 new LCoA

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SECURITY REQUIREMENTS

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 WITHWIRELESS LANS

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

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.

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

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 AccessMethod

CSMA/CA TDMA

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IP Mobility Support For Cellular and Heterogeneous Mobile Networks

2G3G 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

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”.