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1
NTT’s Initiatives for NGN
June 19, 2007Atsushi Hiramatsu
Nippon Telegraph and Telephone Corporation
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(Released in November 2004)
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Roadmap for building the NGNNTT©2007
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NTT Otemachi Showroom for NGN field trialNTT©2007
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NTT’s technologies for NGN
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Control Media Management
Other networks
Applications
Transport control functions
NNIUNI Transport stratum
Service stratum
ANI
Man
agem
ent f
unct
ions
End-userfunctions
Application support functions &service support functions
Service control funictionsService user prifiles
Network attachment
control functions
Transport control functions
Transport user profiles
Resource and admission
control functions
NGN architecture overview at ITU-TNTT©2007
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Overview of NGN field trials
NNINNI
SNISNI
Application server
VoDserver
IP-broadcast server
Terminals
UNIUNI
NGN IP networksof other companies
ISPs, etc.
Terminals
Multicast communication(unidirectional)
Interactive (unicast)
communication(unidrectional)
Interactive (unicast)
communication(bidirectional) PPPoE connection
NGN trial network
UNI : User-Network InterfaceNNI : Network-Network InterfaceSNI : Application Server-Network Interface
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Communication functions and service examples in field trails
Best effort
•SDTV class (MPEG2): 6 Mb/s•HDTV class (H.264): 10 Mb/s
•SDTV class (MPEG4): 2 Mb/s•HDTV class (MPEG2): 30 Mb/s
•Wideband speech: 7kHz (G.722, etc)•Narrowband speech: 3.4kHz (G.711)
Bandwidth (codec)
Best effort
High priority
Highest priority
Highest priority
QoS class
ISP connectionPPPoE connection
Video delivery (VoD
/ IP broadcast)
Interactive (unicast) communication(unidirectional)
Multicast communication(unidirectional)
Video telephony (with 0AB-J phone number)
IP telephony (with 0AB-J phone number)
Interactive (unicast) communication(bidirectional)
Service categoryCommunication functions
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QoS objectives in NGN field trials
0.1%(UNI-SNI)
200ms(UNI-SNI)
400ms(UNI-SNI)
0.1%(UNI-UNI)
200ms(UNI-UNI)
200ms(UNI-UNI)
AF(high)
High-priority
IP-packet loss ratio
IP-packet transfer delay variation
IP-packet transfer delayM
ulticast
AF(low)EFDiffserv mapping
NOT specified*0.1%(UNI-UNI)
IP-packet loss ratio
20ms(UNI-UNI)
IP-packet trnasferdelay variation
NOT specified
70ms(UNI-UNI)
IP-packet transfer delay
Interactive (unicast)
PriorityHighest-priorityClass
*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
Telecommunication networkUNI UNI
Quailty of experience
Service quality (in a broad sense)
Network performance
Example: Customer satisfaction (difference between user expectations and customer-service response)
Examples: Articulation in voice, block noise in video
Examples: Delay, loss, frequency of faults in equipment
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QoS regulations for IP telephony using 0AB-J phone numbers
Carrier A’s IP network
Carrier B’s IP network
UNI UNI
NNI (Interconnection on IP-layer)
QoS objectives between UNI and UNIIP-packet transfer delay: 70 ms max.IP-packet transfer delay variation: 20 ms max.IP-packet loss ratio: 0.1% max.
QoS objectives between UNI and NNIIP-packet transfer delay: 50 ms max.IP-packet transfer delay variation: 10 ms max.IP-packet loss ratio: 0.05% max.
Popular IP telephony terminal
Popular telephony terminal
From: Next Generation IP Network Promotion Forum, Japan
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NTT Research and Development for NGN
Session controlserver
VoD server Authentication/time-certification
IP phone HGW
Serviceedge system
GE-PON
ONU
HGW
ONU
IP broadcastserver
Large-capacityrouter
Information appliances
Various networkcontrol servers
ROADM
SNI
UNI
Ethernetedge system
NNI
PSTNOther IP-
phone network
ISP
Serviceedge system
Large-capacityrouter
ROADM
Service control layer
Transport network layer
Transmission-system
technologies
Ethernet-system technologies
Platform/application technologies
GE-PONOptical access technologies
Transport-system technologies
Gateway systems
Server platform technologies
・・・
・・・
GE-PON: gigabit Ethernet passive optical networkONU: optical network unitHGW: home gatewayPSTN: public switched telephone network
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Architecture for NGN service control server
ATCA
CGL
High-availabilitymiddleware
Next-generationserver applications
Hardware
Operating system
Middleware
APL
Use of standard hardware platform (ATCA)
Use of standard hardware platform (ATCA)
Use of CGL(Carrier Grade Linux)
Use of CGL(Carrier Grade Linux)
Use high-availability middleware
Use high-availability middleware
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Basic architecture for QoS control
Traffic monitoring/control function:Prevents traffic exceeding allocated bandwidth from flowing into the network
Admission control function:The session control server determines the network resources needed and controls service edge systems
Passes only traffic within permitted bandwidth
Blocks excessive trafficService
edge system
Service edge
system
Large-capacity core node
Large-capacity core node
Highest-priority class
High-priority class
Priority class
Best-effort class
Session control server
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Admission control in the NGN
Link bandwidth
Besteffort
High-priorityclass
(1)
High-priorityclass
(3)
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.
The request for a third high-priority-class session is rejected due to insufficient bandwidth.
New session request
Linkbandwidth
High-priorityclass
(1)High-
priorityclass
(2)Besteffort
Link bandwidth
High-priorityclass
(1)High-
Priorityclass(2)
Besteffort
New session request
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Home network configuration for field trail monitor usersNTT©2007
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High-definition video distribution services NTT©2007
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IP retransmission service for terrestrial digital broadcasting NTT©2007
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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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