Interworking IPv6 in Mobile Networks

Interworking IPv6 in Mobile Networks

Mat Ford [email protected]

© British Telecommunications plc, 2002 2

Agenda

Broadband IP network evolution Broadband/3G integration Benefits of MobileIPv6 Interworking options

- NAT-PT- DSTM

Smartv6 Demonstration Conclusions


Typical Broadband IP Model

L2TP Tunnel

Access PoP

ISP

ISP

INTERNET

Carrier IP core

Access PoP


BAS

Broadband ‘Direct’

Access PoP

ASP

ASP

INTERNET

Access PoP

Carrier IP core


IP Mobility

No true IP mobility is available L2TP provides limited IP mobility within the

boundaries of the specific access network Only MobileIP technology can provide true

IP mobility to end users


Agenda


- NAT-PT- DSTM



IPv6 in 3G NetworksIM Domain

IPv6

PS DomainIPv4 or IPv6

Existing IPv4Internet

SGSN GGSN

Mobile Terminal

SIP ProxyServer

Media/SignallingGateway

PSTN

SIP Client

SIP ProxyServer

GTP OperatorsISP

WWW Server


IPv6 in Broadband Networks

DSLAMATM

IP Core

Internet

BASInternet VC – Variable Bit Rate

SIP VC – Constant Bit Rate

IPv6 Multimedia Domain

SIP Serve

r

Other Operator’s Multimedia Domain

Globally routable IPv6 address(es)

IPv4 or IPv6 address


Broadband/3G Integration

Unified infrastructure- No interworking or gateways

No addressing problems- Forecasted volumes easy to cater for

Leverage application development for maximum returns


Agenda


- NAT-PT- DSTM



MobileIPv6 Benefits

MobileIPv6 + Broadband ‘Direct’ model is a powerful enabler of IP mobility

End-users running services are continuously on-line and contactable while roaming between broadband network access segments


MobileIPv6 and Broadband

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


MobileIPv6 and Broadband

ISP B

UserA

UserB

ISP A

Initial traffic only passes through ISPs

Subsequent traffic direct to Care-of-address

Home Agent

Home Agent

Holds care-of-address of user B

Holds care-of-address of user A


Agenda


- NAT-PT- DSTM



IPv6 Transition & Interworking

Transition- how we migrate to IPv6

Interworking- how we continue to operate with IPv4

New networks have no transition requirements

Transition requirements for core networks met through routine upgrades


IPv6 Interworking

Interworking multimedia domains- Enabling SIP application interworking- Deploy proxies at the network boundary

Interworking network core- Dependent on type of address allocation to end-

user- Translation is required where user has no IPv4

address


IM DomainIPv6

PS DomainIPv4 or IPv6

Existing IPv4Internet

SGSN GGSN

Mobile Terminal

SIP ProxyServer

Media/SignallingGateway

PSTN

SIP Client

SIP ProxyServer

GTP OperatorsISP

WWW Server

Interworking Options

Potential points of IPv4/IPv6 interworking

support


NAT-PT Translation

DSL Access Network

IP Network (IPv4)Access Router (IPv6)

End User Equipment(IPv6 only)

NAT-PT

IPv6 DNS

IPv4 DNS

DNS exchange initiates communication via translator

Communication with IPv4 via translator


DSTM Support for native IPv4

DSL Access Network

IP Network (IPv4)

Access Router (IPv6)End User

Equipment(Initially IPv6

only)

DHCPv6End user discovers communication to IPv4 – requests temporary IPv4 address

Native communication with IPv4

IPv4 over IPv6 tunnel


Agenda


- NAT-PT- DSTM



Smart v6 Trial Collaboration between BT, SmarTone and

Ericsson Demonstrating:

- IPv6 applications- IPv6/IPv4 interworking- IPv6 over GPRS- MobileIPv6- Intelligent content delivery


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


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


Mobile Domain

Low Bandwidth


GPRS

Office Domain

High Bandwidth


Reformatted

MIPv6


Smart v6 Trial


Agenda


- NAT-PT- DSTM



Conclusions

Provide a Broadband ‘Direct’ architecture- No ISP lock-in- Optimises bandwidth consumption- Greater flexibility for end-users

Build a network that will scale- Use IPv6

Allow for ‘always-on’ P2P applications- Requires globally routable addressing- Requires IPv6


Conclusions

Prepare for 3G multimedia convergence- 3G IP multimedia *will* run IPv6 only

IPv6 provides many advantages for broadband

- Autoconfiguration, mobility, security…

Transition and migration issues must be overcome


Useful Links

www.ist-ipv6.org www.bt.com/ipv6 www.6winit.org


www.bt.com/ipv6

[email protected]

Interworking IPv6 in Mobile Networks

Technology

ipv6 tunnel

interworking ipv4

routable ipv6 addresses

broadband mobileipv6

ipv4 requests temporary

mobileipv6 benefits

broadband isp b user

specific access network