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
Outline • Abstract • MOBILE IP • MOBILE IPv6 • Hierarchy of MAPs • SECURITY REQUIREMENTS • IP MOBILITY SUPPORT WITH WIRELESS LANS • CONCLUSION
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
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
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
ROUTING IN MOBILE IP 8.ACK 7.Packet from CN to HA 6.Packet Tunneling 5.Binding ACK 4.Binding Update 2.Handoff 3.Got CoA 1.Got home address
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.
Mobile IPv6 routing 7.Packet from CN to MN 6.Binding Update 5.Packet Tunneling 4.Binding ACK 3.Binding Update 2.Got CoA 1.Handoff
Hierarchical Mobile IPv6 4.Packet tunneling 6.Packet from CN to MN 5.Registration RCoA 3.Registration RCoA 2.Registration LCoA 8.Get new LCoA 7.Handoff 1.Handoff
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).
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.
Mobility support is implemented through use of dynamic IP address allocation provided by DHCP DHCP-Based Mobility in Wireless LANs
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
WiMAX( Worldwide Interoperability for Microwave Access,全球互通的微波存取) WiMAX
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
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).
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”.