1

NTT’s Initiatives for NGN

June 19, 2007Atsushi Hiramatsu

Nippon Telegraph and Telephone Corporation

NTT©2007

2

NTT©2007

3

NTT©2007

4

NTT©2007

5

NTT©2007

6

(Released in November 2004)

NTT©2007

7

NTT©2007

8

Roadmap for building the NGNNTT©2007

9

NTT Otemachi Showroom for NGN field trialNTT©2007

10

NTT’s technologies for NGN

NTT©2007

11

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

12

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

NTT©2007

13

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

NTT©2007

14

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

NTT©2007

15

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

NTT©2007

16

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

NTT©2007

17

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

NTT©2007

18

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

NTT©2007

19

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

NTT©2007

20

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

NTT©2007

21

Home network configuration for field trail monitor usersNTT©2007

22

High-definition video distribution services NTT©2007

23

IP retransmission service for terrestrial digital broadcasting NTT©2007

24

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)

NTT©2007