International Telecommunication Union
Resonant Communication
Network Architecture
NTT’s Plans for NGN and Proposals for the Areas
of Standardization
Takashi Hanazawa
Nippon Telegraph and Telephone Corporation
Workshop on Next Generation Networks: What, When & How?
Geneva, 9-10 July 2003
NTT's Operating Revenue
ITU-T
Decrease in revenue from POTS
(Trillion yen)
 Spread of cellular phones
12
10
4.2
8
2.7
6
1.3
3.2
1.6
4.4
3.6
2.1
2.8
 Increased competition
3.3
4
5.4
2
4.9
4.7
4.3
80% increase in users
from 1998 to 2002
8% (domestic) and 37%
(int’l) drop in prices from
1998 to 2002
3.8
 Start of IP phone
0
1997
1998
1999
2000
2001
Mobile
Internet and data communication
Fixed line analog telephony (POTS)
9-10 July 2003
Major ISPs have started IP
phone services in the last
few years
Workshop on Next Generation Networks: What, When & How?
1
Broadband Services in Japan
ITU-T
(Thousand subscribers)
Number of subscribers
10,000
FTTH
8,000
CATV
6,000
DSL
4,000
2,000
0
Mar
2001
9-10 July 2003
Jun
Sep
Dec Mar
2002
Jun
Sep
Dec
Mar
2003
Workshop on Next Generation Networks: What, When & How?
2
ITU-T
NTT’s “Vision for a New Optical
Generation”
<Broadband leading to the world of
resonant communication>
In the new-generation communications environment,
people, as well as companies and other groups in
society, will:
- become “interactive,” using broadband;
- be connected by a ubiquitous network, “anytime,
anywhere and with anyone or anything”;
- enjoy superior usability that is “secure, reliable and
simple”.
 What are the aims?
 For a carrier to provide added value to the broadband
and ubiquitous network environment, by network services.
 To create a rich variety of new services and business
opportunities that capitalize on such features.
9-10 July 2003
Workshop on Next Generation Networks: What, When & How?
3
Network services envisaged for
the NGN
end-to-end communication services
ITU-T  Interactive
 Diversification in service features, such as security, service level
guarantees, and presence information.
 Penetration of easy-to-use terminals is a key issue.
 New means of communication that will replace telephony in the
future.
 Video
delivery services
 Appropriate business models are being explored which take
account of copyright issues.
 Amid the convergence between telecommunications and
broadcasting, and in light of the soon-to-start digital terrestrial b/c,
the b/c industry is highly interested. Potential demand is certain.
 Virtual
Private Network (VPN) services
 The diversification of means of network access, and the need for
flexible network configuration have made highly value-added VPN
a key to differentiation.
 Information
9-10 July 2003
home appliance control services
 Widespread use of cellular phones and PDAs allows users to be
always connected.
 Initial targets are remote control of home appliances and home
security services
 Future targets include diverse services using RFID tags and
various sensors.
Workshop on Next Generation Networks: What, When & How?
4
RENA
Resonant Communication Network Architecture
ITU-T
Firewall
Authentication Encryption
IPSec
Security
Resonant Communication Network
User premises
Access
network
Service/network
control platform
Core network
Home GW
GE-PON
B-PON
FWA
CWDM
9-10 July 2003
End-to-end
connection
High-speed, highcapacity, QoS
IPv6
OXC
MPLS GMPLS Diffserv
ENUM
SIP
DNS
Discovery
Mobile IP
Presence
Workshop on Next Generation Networks: What, When & How?
5
Important standardization areas
ITU-T
GW: gateway
IF: interface
PF: platform
Community Content Information home
collaboration circulation appliance control
Search
engine
Inter-network IF
Web
Control protocol for multilayer transfer
Other network
Network software architecture
Functional architecture allowing flexible
implementation of network software
Inter-OSS IF allowing interworking
between OSSs both inside and outside
a corporation
Network-PF IF
Service/network
control platform
NTW-PF interworking for security
(SIP, MIDCOM)
NTW-PF Interworking for achieving QoS
(SIP)
Terminal-PF IF
Core network
Home GW
Security when multiple SIPs
are involved (SIP)
End-to-end security/QoS
Remote maintenance of
Home GW terminals
Access network IF
Inter-terminal IF
QoS through inter-terminal control (RTCP)
Remote-controlled services
9-10 July 2003
Inter-node IF
Optical access IF (B-PON,
GE-PON) (ITU-T G983,
IEEE802.3ahEFM)
Control protocol for multilayer transfer
(GMPLS based)
Workshop on Next Generation Networks: What, When & How?
6
Desired standardization areas
Home Gateway
ITU-T
• Home GW functions are parts of NGN and will be
implemented in stand-alone unit or in a broadband router, PC,
or home appliance.
• Home GW firmware can be down-loaded from the service
provider.
• To support fair competition and marketing, basic interfaces
around the home GW should be well standardized.
Home GW
firmware
Session Remote
Authentication control control Remote
User network

maintenance
center
Service/network control platform
Home GW
9-10 July 2003
RENA-based
network
Workshop on Next Generation Networks: What, When & How?
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Desired standardization areas
Photonic network
• Tens of Tbit/s throughput will be needed in NGN.
• New core network architecture should be
discussed and standardized.
• NTT is studying “multilayer pass-through
network architecture” as one proposal for this.
ITU-T
Multilayer pass-through network architecture
- GMPLS based protocol
- Mapping onto L1 to pass as
much as possible
IP network
Ether network
ISP
Ether network
ATM network
ATM network
Control protocol
Optical/TDM network
OIX
Optical/TDM network
Wavelength
Edge node
9-10 July 2003
GMPLS
Core
node
GMPLS Core
node
GMPLS
Edge node
Workshop on Next Generation Networks: What, When & How?
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Desired standardization areas
Network Software
ITU-T
Open API for network software
 effective development of new services
 use of third-party applications
 flexible operation of business
Network software architecture
 Flexible platform functions
 Vendor-independent systems
Applications
Third-party
applications
NTT’s
applications
Common
applications
API
Network software platform
9-10 July 2003
Workshop on Next Generation Networks: What, When & How?
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Conclusions
ITU-T Amid the radically evolving telecommunication
industry environment, NTT places its business
priority on “building broadband and ubiquitous
networks.”
NTT R&D continues to develop network services
with the most advanced technology available,
incorporating both de jure and de facto standards.
NTT has a vast amount of accumulated know-how
and experience, and firmly intends to make the most
of these assets in pursuing its R&D programs.
9-10 July 2003
Workshop on Next Generation Networks: What, When & How?
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