Next-Generation MobilityTechnology & Trials

Mat Ford

matthew.ford@bt.com

Agenda

• Why Mobile IP?• Mobile IPv6 technical overview• Mobile IPv6 vs. Mobile IPv4• Mobile IPv6 - Enhancements• Mobile IPv6 - Status• Home Networking and Mobile IPv6• 3G and Mobile IPv6• SmartMobility Trial – Hong Kong• 6WINIT – IPv6 Wireless Internet Initiative• Questions

Why Mobile IP?(1)

• Both ends of TCP connection need to keep the same IP address for the duration of the session– This is the Home Address used for end-to-end

communication

• IP needs to allocate new address when you move point-of-attachment to the network– This is the Care-of Address used for routing

• MobileIP turns mobility problem into routing problem by maintaining a dynamic association between HA and COA known as a Binding

Visited Net

Why Mobile IP?(2)

Home Net

Mobile Node

Home Agent

Internet

Visited Net

Correspondent

TCP

conn

ectio

nMobile Node

TCP connection

TCP connection

Mobile Node

MobileIPv6 Technical Overview(1)

• Router advertises routing prefix: • Mobile node auto-configures Care-of Address

• Mobile Node sends Binding Updates to Home Agent and Correspondents

• Mobile Node is ‘Always-On’ by way of Home Agent

2001:618:6:f1::

2001:618:6:f1:: 2d0:b7ff:fe91:5c0c

2001:618:6:f1:2d0:b7ff:fe91:5c0c

+

=

MobileIPv6 Technical Overview(2)

Home Net

Home Agent

Internet

Visited Net

Correspondent

Mobile Node

TCP

conn

ectio

nMobile Node

2001:618:6:f1:: 2d0:b7ff:fe91:5c0c2001:618:6:f1:2d0:b7ff:fe91:5c0c

Binding UpdateTCP connectionBinding Update

MobileIPv6 vs. MobileIPv4

• Binding Updates allow mobile node to notify correspondents of current location – no ‘dog-leg’ routes

• Home Address Option permits topologically correct source address use – eliminates problems with ingress-filters

• Routing Headers remove overheads associated with encapsulation

• Enough security is built in (although key distribution problematical)

MobileIPv6 – enhancements(1)

• Hierarchical MobileIPv6• AAA interactions• Fast/Smooth/Seamless Handoffs• Header Compression• Enable MobileIPv6 to act as mobility technology

within and between cellular networks – All-IP Cellular Networks

MobileIPv6 – enhancements(2)

Context H

andover

Heirarchical MIP

Heira

rchi

cal M

IP

AAA

MobileIPv6 - status

• Details of IPsec use in MobileIPv6 have been worked out

• Base protocol is at Last Call in the IETF• Various interop tests have been successfully

completed• Several publicly available implementations

• Autoconfiguration• Always On• Incoming comms for remote home automation• Security• P2P is growing fast• Large numbers of devices

Home networking with IPv6

Home networking & Mobile IPv6(1)

• Without MobileIP, connections from UserA to UserB have to go via ISP A and ISP B

• Inefficient routing• Poor scalability• Multiple single-points-of-

failure

ISP B

UserA

UserB

ISP A

Home networking & Mobile IPv6(2)

• MobileIPv6 provides optimal traffic path

• Only initial traffic is routed through other ISPs point of attachment

• Subsequent traffic routed directly to COA

• Improves scalability

ISP B

UserA

UserB

ISP A

IPv6 in 3G networks

• IM domain is specified IPv6 only in Release 4/5• Are terminals dual-stack or IPv6-only?• Is backbone network dual-stack or IPv6-only?• In time all network elements will migrate to an

IPv6-only solution• Inter-working uses DSTM? NAT-PT?

IPv6 in 3G networks

SIP

SIP

Media GatewayControl Function

PSTN

3G IM DomainIPv6 Network

Call StateControl(CSCF)

Media Gateway(MGW)

E-SGSN E-GGSNIPv4

Internet &

Intranets

IPv4 or IPv6 Internet / intranet

v4v6

IPv6 Backbone for Tunnelling Layer

v4v6

v4v6

3G and MobileIPv6

• MobileIPv6 enables seamless roaming between 3G/cellular environment and fixed home/corporate networks

• MobileIPv6 not currently specified in 3GPP

Smart v6 Trial

• Collaboration between BT, SmarTone and Ericsson

• Intended to demonstrate IPv6 applications, IPv6/IPv4 interworking, IPv6 over GPRS, and MobileIPv6 including intelligent content delivery

• Support SmarTone in their bid for a 3G license• 2 day event in Hong Kong October 24th/25th

Smart v6 Trial

• Scenario 1: IPv6-only clients, IPv6-only network running Quake, mp3, Video, WWW

• Scenario 2: Interworking IPv4 and IPv6• Scenario 3: MobileIPv6 and content customisation• Scenario 4: Inter-technology handover

IPv4 GPRSContainer

RNC

WLAN BS2

Serial Router 2

Ultima202.140.100.18

202.140.100.22-30

HKLive IPv4

MAP202.140.100.20

Scenario 4: Fixed/Mobile

roaming

R520Ethernet

Scenario 3: Broadband MobileIPv6

Scenario 2: Wireless

broadband IPv6

WLAN BS1 Scenario 1: Fixed

broadband IPv6

VOD

Local Native IPv6 Network

HA

Hub 3

Hub 2

APPS(WWW, MP3, Quake, DNS)

202.140.100.17

PROXY202.140.100.19

CN

Hub 1

Router 1

Ethernet 6in4 tunnel202.140.100.21

PC 6in4 tunnelPrivate IPv4 addresses

To UK

PC

MIPv6

MIPv6

Smart v6 Trial

Scenario 1: Broadband IPv6

Applications Server

DNS Server

HK IPv6 Network

WLAN

Quake IPv6 LocalInternet

IPv6 MP3 Audio

IPv6 VoD

Scenario 2: IPv6 meets IPv4

DNS Server

HK IPv6 Network

IPv4 Internet

UK IPv6 Network

IPv6 Internet

IPv4Internet

IPv6 MP3 Audio

Scenario 3: MobileIPv6

Portal Server

Database Server

Home Agent

IPv4 InternetHK IPv6

Network

Local News & Weather

Home Domain

Office Domain

WLAN

Business News, Shares & Reminders

WLAN

MIPv6

Scenario 4: Inter-technology handover

Portal Server

Database Server

Home Agent

IPv4 Internet

WLAN

HK IPv6 Network

GPRS

Business News, Shares & Reminders

Mobile Domain

Low Bandwidth

Business News, Shares & Reminders

GPRS

Office Domain

High Bandwidth

Business News, Shares & Reminders

Reformatted

MIPv6

Smart v6 Trial

Smart v6 Trial

• Compaq iPAQ 32MB• OS on Flash ROM• Runs LINUX• Support for WLAN, USB• Developing IPv6 support• Need applications…

6WINIT – IPv6 Wireless Internet Initiative

• EU Fifth Framework project• 18 project participants including US, Korea and

Canada• Aims to build international wireless IPv6

infrastructure and application testbed• Applications: generic and clinical• 2 year project 01/01/01 – 31/12/02• BT will provide network infrastructure and

interworking expertise

Questions?

• Thanks for your attention• Any questions?

www.bt.com/ipv6matthew.ford@bt.com