NTT©2007
NTT’s Initiatives for NGN
June 19, 2007
Atsushi Hiramatsu
Nippon Telegraph and Telephone Corporation
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NTT©2007
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NTT©2007
(Released in November 2004)
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Roadmap for building the NGN
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NTT Otemachi Showroom for NGN field trial
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NTT’s technologies for NGN
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NGN architecture overview at ITU-T
Applications
ANI
Management functions
Application support functions &
service support functions
Service user
prifiles
Service control funictions
Service stratum
Transport
user profiles
Network
attachment
control functions
End-user
functions
Resource and
admission
control
functions
Other
networks
Transport control functions
Transport control functions
UNI
NNI
Transport stratum
Control
Media
Management
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NTT©2007
Overview of NGN field trials
IP-broadcast
server
VoD
server
UNI : User-Network Interface
NNI : Network-Network Interface
SNI : Application Server-Network Interface
Application
server
SNI
NGN IP networks
of other companies
NGN trial network
Interactive
Multicast
(unicast)
communication communication
(unidirectional) (unidrectional)
Interactive
(unicast)
communication
(bidirectional)
PP
PoE
t
nec
n
o
c
UNI
ion
ISPs, etc.
NNI
Terminals
Terminals
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Communication functions and service examples in field trails
Communication
functions
Interactive (unicast)
communication
(bidirectional)
Interactive (unicast)
communication
(unidirectional)
Service category
Bandwidth (codec)
IP telephony (with
0AB-J phone
number)
Highest priority
•Wideband speech: 7kHz (G.722, etc)
•Narrowband speech: 3.4kHz (G.711)
Video telephony
(with 0AB-J phone
number)
Highest priority
•SDTV class (MPEG4): 2 Mb/s
•HDTV class (MPEG2): 30 Mb/s
Video delivery
(VoD
/ IP broadcast)
High priority
•SDTV class (MPEG2): 6 Mb/s
•HDTV class (H.264): 10 Mb/s
Multicast
communication
(unidirectional)
PPPoE connection
QoS class
Best effort
ISP connection
Best effort
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QoS objectives in NGN field trials
Interactive (unicast)
Class
Highest-priority
High-priority
Priority
Diffserv mapping
EF
AF(high)
AF(low)
IP-packet transfer
delay
70ms
(UNI-UNI)
200ms
(UNI-UNI)
IP-packet trnasfer
delay variation
20ms
(UNI-UNI)
200ms
(UNI-UNI)
IP-packet loss ratio
0.1%
(UNI-UNI)
0.1%
(UNI-UNI)
NOT specified
Multicast
IP-packet transfer
delay
400ms
(UNI-SNI)
IP-packet transfer
delay variation
200ms
(UNI-SNI)
IP-packet loss ratio
0.1%
(UNI-SNI)
NOT specified*
*Priority-class traffic is given priority over best-effort class by packet transfer processing in the network
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Quality in telecommunication services
Service quality (in a broad sense)
Example: Customer satisfaction (difference between user expectations and customer-service response)
Quailty of experience
Examples: Articulation in voice, block noise in video
Network performance
Examples: Delay, loss, frequency of faults in equipment
Telecommunication network
UNI
UNI
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QoS regulations for IP telephony using 0AB-J phone numbers
QoS objectives between UNI and UNI
IP-packet transfer delay:
70 ms max.
IP-packet transfer delay variation: 20 ms max.
IP-packet loss ratio:
0.1% max.
Popular IP
telephony
terminal
UNI
UNI
Popular
telephony
terminal
Carrier A’s IP network
NNI (Interconnection on IP-layer)
QoS objectives between UNI and NNI
IP-packet transfer delay:
50 ms max.
IP-packet transfer delay variation: 10 ms max.
IP-packet loss ratio:
0.05% max.
Carrier B’s IP network
From: Next Generation IP Network Promotion Forum, Japan
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NTT Research and Development for NGN
NTT©2007
Platform/application technologies
IP broadcast
server
Authentication/ ・・・
time-certification
VoD server
SNI
Service control layer
Server platform technologies
Session control
server
Various network
control servers
・・・
Transport network layer
Large-capacity
router
ROADM
Service
edge system
GE-PON
ONU
Transport-system
technologies
ISP
Large-capacity
router
Transmissionsystem
technologies
Optical access
technologies
ROADM
Service
edge system
HGW
Information appliances
Other IPphone network
NNI
Ethernet
edge system
Ethernet-system
technologies
GE-PON
ONU
UNI
IP phone
PSTN
Gateway
systems
HGW
GE-PON: gigabit Ethernet passive optical
network
ONU: optical network unit
HGW: home gateway
PSTN: public switched telephone network
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Architecture for NGN service control server
APL
Middleware
Next-generation
server applications
High-availability
middleware
Operating
system
CGL
Hardware
ATCA
Use
Usehigh-availability
high-availability
middleware
middleware
Use
Useof
ofCGL
CGL
(Carrier
(CarrierGrade
GradeLinux)
Linux)
Use
Useof
ofstandard
standardhardware
hardware
platform
platform(ATCA)
(ATCA)
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Basic architecture for QoS control
Admission control function:
The session control server determines
the network resources needed and
controls service edge systems
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Session
control
server
Highest-priority class
High-priority class
Passes only traffic within
permitted bandwidth
Priority class
Best-effort class
Blocks excessive traffic
Service
edge
system
Large-capacity
core node
Large-capacity
core node
Service
edge
system
Traffic monitoring/control function:
Prevents traffic exceeding allocated
bandwidth from flowing into the network
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Admission control in the NGN
New session request
HighLink
priority
class bandwidth
(1)
Best
effort
New session request
HighLink
priority
class bandwidth
(1)
HighLink
priority
class bandwidth
(1)
Highpriority
class
(2)
Best
effort
HighPriority
class
(2)
Best
effort
Because bandwidth for two high-priority-class
sessions is available, the session request is accepted.
The quality of the best-effort class may deteriorate
when the bandwidth becomes insufficient.
Highpriority
class
(3)
The request for a third highpriority-class session is
rejected due to insufficient
bandwidth.
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Home network configuration for field trail monitor users
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High-definition video distribution services
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IP retransmission service for terrestrial digital broadcasting
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Thank you!
I hope you will enjoy the visit to our Otemachi showroom on Thursday.
Reference:
NTT Financial report on November 2006 (www.ntt.co.jp)
NTT Technical Review on June 2007 (www.ntt-review.jp)
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