ITU Workshop on IPv6
Geneva, Switzerland, 4 – 5 September 2008
Impact of IPv6 to an NGN
and Migration Strategies
Gyu Myoung Lee
ETRI
gmlee@etri.re.kr
Geneva, Switzerland, 4-5 September 2008
International
Telecommunication
Union
Contents
Introduction
Impact of IPv6 to an NGN
IPv6-based NGN
Impact of IPv6
Key technical solutions
Roadmap for future standardization
Migration Strategies
Conclusion
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Introduction
IPv6
IETF has designed IPv6 from 1994
An Internet Layer protocol for packetswitched internetworks
A much larger address space than IPv4
Many features and benefits
Direction for network evolution
PSTN to NGN in Telco’s perspective
Adopt IPv6 technologies to an NGN
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IPv6 and NGN
Why IPv6?
One of the useful delivery protocols for
the future fixed and wireless/mobile
network environments
Why NGN?
Packet-based converged network
Multiple broadband, QoS-enabled transport,
Separation services with transport
IPv6 + NGN = IPv6-based NGN
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ITU-T Q.9/13
Impact of IPv6 to an NGN
IPv6 protocol and its mechanisms in
alignment with the functional
architecture and reference model of NGN
IPv6 protocol architectures and
functional blocks in NGN
Impact of possible use of IPV4 and IPV6
in transitional phases of NGN.
4 Recommendations (Jan. 2008)
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IPv6-based NGN
General overview
Y.2051, General overview of IPv6-based NGN
Application
IPv6-based service/application
Service Stratum
IPv6
Enabled
End-User
Functions
IPv6
Enabled
Processing
Transport Stratum
xDSL Access
Mobile Access
Core Network
Wireless Access(WiMAX)
Fiber Access
IPv6-based IP Connectivity
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Impact of IPv6
Enhanced service capabilities
Any-to-any IP connectivity
Self organization and service
discovery using auto-configuration
Multi-homing using IPv6 addressing
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Key technical solutions (1)
IPv6 signalling
Y.2054, Framework to support signalling for IPv6-based NGN
Traffic class, flow label, extension header
Applications
ANI
S ignalling for
s ervice
c ontrol
IPv6 Enabled Application/Service Support
Functions
Service Control Functions
S ervice Stratum
S ignalling for
tr ansport
c ontrol
IPv6
Enabled
End-User
Functions
S ignalling for
in terworking
IPv6 Enabled
IPv6 Enabled
Network
Resource &
Attachment
Admission
Control
Control
Functions
Functions
Transport Control Functions
PSTN/ISDN
mobile/wireless
networks
Broadcasting
networks
IPv6-based Transport Functions
UNI
T ransport S tratum
IPv4/IPv6
networks
NNI
Oth er Networks
Control
IP v6-based IP c onnectivity
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Key technical solutions (2)
IPv6 multi-homing
Y.2052, Framework of multi-homing in IPv6-based NGN
Always-on
connectivity
Load sharing
Traffic engineering
Fault tolerance with
redundancy
Session continuity
across access
networks
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Key technical solutions (3)
IPv4-to-IPv6 transition
Y.2053, Functional requirements for
IPv6 migration in NGN
Dual stack, Configured tunnel, NAT-PT
End User
Terminal
End User
Terminal
End User
Terminal
End User
Terminal
End User
Terminal
….
End User
Terminal
….
Public
Internet
….
Other
NGN
RACF
NACF
AN-FE
EN-FE
ABG-FE
IBG-FE
Core Transport
Network
Access
Network
End User
Terminal
Access
Network
End User
Terminal
Access
Network
Access
Network
Access
Network
End User
Terminal
….
Customer
Network
….
End User
Terminal
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End User
Terminal
….
….
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Roadmap for future standardization(1)
Proposed roadmap items based on NGN
Draft
Title
Transport Stratum Extension in IPv6based NGN
Service Stratum Extension in IPv6Y.ipv6-Service
based NGN
Framework of identity processing in
Y.ipv6-ID
IPv6-based NGN
IPv6 address mapping functions for
Y.ipv6-amf
ID/LOC separation in IPv6-based NGN
Interworking with heterogeneous
Y.ipv6-interworking
networks in IPv6-based NGN
Y.ipv6-Transport
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Target Date
End of 2009
(with Q.3/13)
End of 2009
(with Q.3/13)
End of 2010
End of 2010
Mid of 2011
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Roadmap for future standardization(2)
Additional roadmap items based on NGN
(under consideration)
Draft
Title
Target Date
Y.ipv6-vcmh
Vertical Cognitive Multihoming in IPv6-based NGN
TBD
Y.ipv6-adhoc
Framework of ad-hoc network
in IPv6-based NGN
TBD
Y.ipv6-deploy
Deployment scenarios of IPv6baseed NGN
TBD
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Migration Strategies (1)
Basic assumption for migration
IPv6 is expected to gradually replace
IPv4
IPv4 and IPv6 will need to coexist during
the transition
NGN can run both IPv4 and IPv6
concurrently throughout the migration
IPv4 – IPv6 coexistence
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Migration Strategies (2)
Governments
Policy
Guideline, promotion, address allocation
Network operators
Deployment and operation
Enabling IPv6 on the core transport network
Vendors
Development of technical solutions
Dual-stack, IPv6-enabled end-devices
Create new business and market with IPv614
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Migration Strategies (3)
Stepwise approach
IPv6
Deployment
Stage 3
IPv6 dominant
Stage 2
IPv6 dissemination
Government driven
Æ Market driven
Stage 1
IPv6 introduction
Critical timeline
Time
International
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Migration Strategies (4)
Backward compatibility for gradual transition
Relationships with heterogeneous networks
2a
IPv6-based
2b
NGN2
IPv6-based
IPv6-based
1b
1a
IPv6-based
IPv4-based
NGN1
2c
3c
IPv4-based
IPv4-based
3b
IPv4-based
1c
3a
4b
4c
Non-NGN
IPv6-based
IPv4-based
4a
IPv6-based
Group 1
Intra-NGN Communication
Group 2
Inter-NGN Communication
Group 3
Group 4
Interworking with Non-NGN
Interworking between Non-NGN
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Conclusion
IPv6-based NGN
Key infrastructure for packet-based
converged network
Future work
Preparation for increase of devices
Standardization (ITU-T, IETF, etc)
How to adopt IPv6 technologies to an NGN
Focus on realization of NGN with IPv4IPv6 migration
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Backup Slides
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Key features of IPv4 and IPv6
IPv4
Packet Format
Size of IPv6 header
Variable size
Constant size
Optional headers
Optional headers
Extension headers and options
Addressing spaces
Lack of address spaces
Large address spaces
No
Yes
Unicast, multicast and broadcast
Local and global
A address
Unicast, multicast and anycast
Link-local, local and global
Multiple addresses
Multiple interface/addresses
Multiple interfaces/addresses
Using private addresses
Using public addresses
Hierarchical addressing
-
Yes
Address Renumbering
-
Yes
Type of Service field
Traffic class field
Identification of traffic flows
None
Flow label field
Recognition of control/expedite data
None
Hop-by-Hop extension header
AH header
Optional
Mandated
ESP header
Optional
Mandated
Detection of new networks
-
RA messages
Generation of new addresses
-
Autoconfiguration
Mobility headers
-
Mandated
Optional
Mandated
End-to-end communications
Addressing
Types of addresses
Scopes of addresses
Address configuration to an interface
Address allocation to an equipment
Address Autoconfiguration
Management of service conflicts
QoS
Security
Mobility
IPv6
Option header
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Functional architecture of
IPv6-based NGN
Applications
ANI
Management Functions
IPv6 enabled Application Support Functions & Service
Support Functions
Service User
Profiles
Service Control
Functions
Service stratum
IPv6 Enabled
Network Attachment
Control Functions
IPv6
Enabled
End-User
Functions
IPv6 Enabled
Resource and Admission
Control Functions
IPv4 Non
NGN
Transport User
Profiles
IPv6 Non
NGN
Transport Control Functions
IPv4
NGN
IPv6
NGN
IPv6-based Transport Functions
UNI
NNI
Transport stratum
Control
Media
Management
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