ip multimedia convergence technologies implemented by ims

IP Multimedia Convergence Technologies Implemented by IMS and Other Functions

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Tatsuro MURAKAMINTT Service Integration Laboratories

April 19, 2007

Contents

�Telecommunications trends leading to the NGN

�Technologies which enable network convergence

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�NTT’s plans for the deployment of its NGN

�Conclusions

Contents



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�Conclusions

Issues facing telecom carriers

In addition to reducing CapEx and OpEx, another urgent task for network carriers is increasing revenue in order to increase profit.

� Promote broadband & ubiquitous services like FMC and triple play

Revenue shift from telephony

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Costs

Revenue from Broadband

and ubiquitous services

Revenue fromtelephony � Collaborate with various service

players in creating new businessesExpand telecoms market

� Migrate telephone network to IPReduce CapEx and OpEx

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�Conclusions

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Services

Service control

Network convergence, layer-structured model

Network convergence decomposes different networks, such as PSTN/ISDN, Mobile networks, Data networks and CATV, into four layers: “access”, “core”,

“service control”, and “application” layers.

ApplicationApplication convergenceSeamless services to create

new businesses

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CA

TV

Access transport &

switching networks

Service control

convergenceExisting and newly

emerging (bb&u) services

Core convergenceReduction of CAPEX, OPEX

Service control

Multi-service

core

Wireless

accessWireline

access

The three issues

Overall picture of NGN architecture

Application functions Application functions

Service provision functions (platform) SDP

Roughly speaking, the NGN functions can be realized by adding IMS, S/BC, RACS,

SDP, etc. to an existing IP network.

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Other

networks

Other network

NWaccess

functions

Access transportfunctions

Core transport function

CustomerNASS

Access authentication

Address distribution

IMSService control functions

User profile functions

RACSTransport control functions

S/BC

Gateway functions

NWedge

functions

S/BC

Multiplexing/Demultiplexing of IP bearers through S/BC

Pinfall controlAddress translationBandwidth assignment/access controlPolicy control

Service integration Inter-carrier links

Defense against DOS attacksQuality and SLA monitoringetc.

S/BC manages the multiplexing/demultiplexing of a variety of IP-based bearers,

such as voice, video and other types of IP data. At the same time, it controls the

QoS and security of each bearer according to a given network policy.

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Voice service

Video service

Internet service

・・

・・

・・

・・・・・・

・・

・・

・・

・・・・・・

Per userService integration Inter-carrier links

NW edge functions Gateway functions

S/BC

Application functions Application functions

Service provision functions (platform) SDP

RACS - collaboration between service control and transport functions

IMSService control functions User profile functions

RACS controls the transport QoS by means of collaboration between the service

control functions and the transport functions.

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Other

networks

Other network

NWaccess

functions

access transport functions

Core transport function

CustomerNASS

Access authentication

Address distribution

S/BC

Gateway functions

NWedge

functions

S/BC

RACS (Resource and

Admission Control Subsystem)

Service policy determination

SPDF

Resource use permission

A-RACF

Admission control

Policy control

Collaboration

with SIP

IMS - from 3G to NGN

InternetInternetPSTNPSTN

Extend the IMS concept tothe “access independent”

specification of call control servers

3G mobile network (present) All-IP mobile network FMC all-IP network


The IMS is a call control architecture that has been studied for the all-IP implementation of mobile networks. The NGN applies IMS technology to fixed-line

access networks, with some extension to the functions. A network based on the IMS

is expected to facilitate convergence such as FMC (Fixed-Mobile Convergence).

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(IP)

packet

network

Existing 3Gmobile terminal

3G access

3G-AP3G-AP

Circuit-switched

voice network

InternetInternetPSTNPSTNservers

Mig

ratio

n to

all-IP

ba

ck

bo

ne

ne

two

rk

FM

C th

rou

gh

a v

arie

ty

FM

C th

rou

gh

a v

arie

ty

of a

cc

es

s m

eth

od

s

All-IPmobile terminal

All-IP core

network

3G access

3G-AP3G-AP


All-IP core

network

3G access(several Mb/s)

3G-AP3G-AP

4G access(100 Mb/s)

4G-AP4G-AP

3G terminal 4G terminal

Hot spot

WLANWLAN FixedFixed

Fixed-line terminal

Optical,copper

IMS IMS

Web world

Service delivery platform (SDP)

APL

Web Application server

APL ITDomain

APL: application

The SDP is the platform which has common functions for various application

servers. The SDP has the role of connecting the Telecom Domain to the IT Domain and promoting the coordination of telecom services, Web services, and multicast

services

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SIP server

(S-CSCF)

IMSHSS

SDP

Phone servicesWeb-based

phone services

Multicast servers

TelecomDomain

Additional

Telephony

service

IPCentrex

IPCall center

APL server APL server APL server

Synergy between services

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�Conclusions

NTT Medium-term Strategy - November ’04

Objective

Contribute to National Plans of e-Japan and u-Japan to solve social problems such as population aging and environmental issues

Milestone

Migrate 30 million customers to optical fiber access and next-generation network services by 2010

Specific actions

(1) Develop and implement a ubiquitous broadband service by integrating fixed and mobile communications, etc.

(2) Build a high-quality next-generation network that is flexible and secure

Build an NGN that is of high quality, flexible and secure

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(3) Migrate seamlessly from existing fixed line telephony to IP telephony and from copper wire systems to optical fiber access

(4) Expand business opportunities using a ubiquitous broadband service

(5) Strengthen our competitiveness and financial base

Strengthen competitive edge and financial base, and contribute to achievement of u-Japan

Implement smooth migration from existing fixed-line to IP-basedtelephony, and from copper to opticalaccess

Develop and spread broadband and ubiquitous services that allow fixed-mobile convergence (FMC)

Expand business opportunities by exploiting broadband ubiquitous services

Provide new business opportunities to a variety of service players (XSP)

Build an open network that allows collaboration with other carriers and ISPs

NTT Medium-term Strategy - November ’04

Objective

Contribute to National Plans of e-Japan and u-Japan to solve social problems such as population aging and environmental issues

Milestone

Migrate 30 million customers to optical fiber access and next-generation network services by 2010

Specific actions

(1) Develop and implement a ubiquitous broadband service by integrating fixed and mobile communications, etc.


Build an NGN that is of high quality, flexible and secure

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(3) Migrate seamlessly from existing fixed line telephony to IP telephony and from copper wire systems to optical fiber

(4) Expand business opportunities using a ubiquitous broadband service

(5) Strengthen our competitiveness and financial base

Strengthen competitive edge and financial base, and contribute to achievement of u-Japan

Implement smooth migration from existing fixed-line to IP-basedtelephony, and from copper to opticalaccess

Develop and spread broadband and ubiquitous services that allow fixed-mobile convergence (FMC)

Expand business opportunities by exploiting broadband ubiquitous services

Provide new business

opportunities to a variety ofservice players (XSP)

Build an open network that allows collaboration with other carriers and ISPs

1 2 3

Issues facing telecom carriers

In addition to reducing CapEx and OpEx, increasing profit by increasing revenue is also an urgent task for network carriers.

� Promote broadband & ubiquitous services like FMC and triple play

Revenue shift from telephony 2

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Cost

Revenue from Broadband

and ubiquitous services

Revenue fromtelephony � Collaborate with various service

players in creating new businessesExpand telecoms market

� Migrate telephone network to IPReduce CapEx and OpEx 1

3

Year

Steps in introducingthe NGN

2006 2007 2008–

Field trials

Construction ofaccess network

Seamless integration with mobile network

STEP 1

STEP 2

STEP 3

Introduction of optical fiber to 30M users (End of fiscal 2010)

Construction of relaynetwork

Roadmap to building NTT’s NGN

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Core network

Service controlfunctions

Servicedevelopment

access network with mobile network

Deployment of service control functions

Trial services<Field trials in limitedregions and with a limited number of users>

IMS deployment(Conforming to ITU standards)

-deploy relay nodes-deploy optical wavelengthtransmission equipment

deploy edge nodes

network

・・・・ Broadband Internet access・・・・ IP telephony・・・・ Multicast transmission for video distribution・・・・ Bi-directional video (data) communication・・・・ Ethernet services, etc.

Full scale development of next generation services

Overview of Field Trials of NTT’s NGN

• Trial period: One year from Dec. 2006Phase 1 (Dec. 2006- ): Showrooms for visitorsPhase 2 (Jan. 2007- ): NTT employees in following regionsPhase 3 (May – Dec. 2007): Customers in following regions

• Areas: Tokyo and its surroundings and Osaka

Open connectivity functions

Various services through tie-ups with IT-home

appliance manufacturers and ASPs

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Base station

End-to-end quality controlSecurity

functions

IP multicast function

NGNNGN

Open connectivity functions

FMC

Internet

accessVideo

distribution

IP telephony

Implementing IMS functions

Application Server

IMS

Service control(S-CSCF)

Interconnection

(I-CSCF)

Terminal mngmt

(P-CSCF)

Call control servers

SIP servers

・・・・IMS is implemented based on Release 1 of the ETSI/TISPAN specifications.・・・・NNIs and UNIs being discussed in ITU-T SG11 are implemented.

SIP-NNISIP-UNI

Under discussion in ITU-T

Open Interface

Based on Release

1 of ETSI/TISPAN

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Other

network

NWaccess

functions

Access transport functions

Core transport functions

CustomerNASS RACS

NW edgefunctions

(I-CSCF)(P-CSCF)

PSTNconnection

Sound sourcecontrol

GW control

NW edgefunctions

ETSI/TISPAN: European Telecommunications Standards Institute /Telecoms & Internet converged Services & Protocols for Advanced Networks

ITU-T: The International Telecommunication Union - Telecommunication Standardization Sector

IMS: IP Multimedia Sub-system

NASS: Network Attachment Sub-system

RACS: Resource and Admission Control Sub-system

SIP-NNISIP-UNI

Specified in ITU-T

Priority control according to the type of communication

Highest priority

Second highest priority

Best effort

NW edge functions

High priority

・・・・In the field trial, one of four quality classes is selected according to the type of

communication.・・・・The edge controls the flow according to the given priority class.

NW edge functions

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Quality class Highest priority

2nd highest priority

High priority Best effort

Priority control class(Diffserv PHB)

EF AF (2nd highest priority)

AF (high priority)

Default

Interactive (unicast)

communication

IPv4 �� -

IPv6 ��

Multicast communication

IPv6 - �� - ��

PPPoE connection

IPv4 - - - ��

RACS and NW edge functions

Session

Control

・・・・ RACS and NW edge functions share end-to-end QoS control.・・・・ In addition, NW edge functions provide security, multicast and other functions.

�Dynamic bandwidth reservation and

admission control in the access networks

�NAT control at the service edge router

�Priority reservation for emergency calls

�Address hiding by NAT

�Per flow QoS control (Diffserv)

�Packet filtering

�Multicast support

�RTP packet QoS monitoring

�H.248 interface (conforming to

TISPAN)

RACS functions

NW edge functions

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Voice service

Video service

Internet service・・

・・

・・

・・・・・・・・

・・

・・

・・・・・・

users

Inter-carrier links

NWedge

functions

Gatewayfunctions

Control �Priority reservation for emergency callsTISPAN)

�ISP connection (PPPoE)

�IP address assignment (v4/v6) RACS

Provision of SNI for service providers

・・・・ SNI (Application Server-Network Interface) is provided as an open interface.・・・・ This enables service providers to provide services using not only SIP

applications but also video delivery and is the result of a consensus between

NTT and various service players in establishing the SDP.

IP

broadcast

server

Video

delivery

server

Other

application

server

SNINNI

SNI: Application Server-Network Interface

NNI: Network-Network Interface

UNI: User-Network Interface

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end user

Enterprise

end userEnd user End user

NGNIP phone service provider

UNI

�� Multicast communication

�� Unicast communication

�� Interactive communication

�� ISP connected communication

�� Ethernet connected communication

ISP / enterprise network

Ethernet service provider

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�Conclusions

Conclusions

� Common issues facing telecom carriers are the need to do the following.• Migrate from PSTN to IP, so reducing capex and opex. • Shift revenue from telephony to broadband. • Create new services and businesses to expand the telcoms market.

� The NGN is an IP converged network using the following technologies to enable IP convergence.• S/BC (Session/Border Controller) and RACS (Resource and Admission

Control Sub-system)

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• S/BC (Session/Border Controller) and RACS (Resource and Admission Control Sub-system)

• IMS (IP Multimedia Sub-system)• SDP (Service Delivery Platform)

� NTT’s NGN is challenge to solve issues facing telecom carriers.• NTT’s NGN will provide high reliability and flexibility to bring new

capabilities to information and communication services• The field trials will verify the implementation of technologies based on

the NGN architecture and feedback from the results will be used in standardization and the production of mature, commercial products.

Thank you

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ip multimedia convergence technologies implemented by ims

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