SKT Case StudySKT Case Study on IMS on IMS Implementation and DeploymentImplementation and Deployment

2007. 03. 202007. 03. 20

Sung KimSung Kim

< IMS Korea 2007 >< IMS Korea 2007 >

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Table of ContentsTable of Contents

nn IMS OverviewIMS Overview

nn Drivers and Benefits of IMSDrivers and Benefits of IMS

nn IMS History in SK TelecomIMS History in SK Telecom

nn SKTSKT’’ss IMS Services and DeploymentIMS Services and Deployment

nn Challenges and Towards..Challenges and Towards..

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IMS OverviewIMS Overview

q IMS = IP Multimedia CN Subsystem

q IP Multimedia Domain for call control based on SIPn User/Service Profile Management

n Session Triggering and Routing

n Security and Charging

n QoS Control

n Interworking with other networks(CS/PSTN)

q Standardization n 3GPP R5: Frozen in March/June 2002

n 3GPP R6: Frozen in March 2005

n 3GPP R7: Frozen in March 2007

q Well-organized infrastructure for globally interoperable IP multimedia services

n Based on global standard

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q Needs for IP Multimedia servicesn Broadband access and growing customer needs for

IP(internet) multimedia services

n User experience improvement

n Competition beween Telco and Internet (Skype,Yahoo, Google,etc)

q Convergent network & services environmentn FMC(Fixed-Mobile Convergence)

n Telecommunication & Broadcasting convergence

q Shorter Time-to-Market n Market trends change faster and customer requirements

are getting various

q Reduced CAPEX & OPEXn Cost savings through efficient network and services

deployment

IMS Drivers (Market)IMS Drivers (Market)

5

q Framework providing Converged Service Enablersn Multimedia communication(voice,text,video,data) control,

Group/Community management, Presence, Media handling,etc.

n New reliable and innovative services can be easily created based on this framework

q Access Network Independencen Any access type and technology(wireline,wireless,cable,,) only

if it can provide IP connectivity capabilty

n Common for all user equipments(fixed,mobile) and service continuity

q Integrated Call-control and Common Resourcesn IP-based service control, Subscription database,

Authentication and Security, Charging, Interconnection to other network,etc

n Enables horizontal layer approach

IMS Drivers (Technology)IMS Drivers (Technology)

6

q IMS Standard Evolution

3GPP

R5 IMS

3GPP2WLANOMA

3GPP

R6 IMS

3GPP

R7,R8 IMS

ITU-T

TISPANATIS

CableLabs

Fixed-Mobile Convergence

(NGN IMS)

n 3GPP IMS Specification endorsement in another 3G mobile(3GPP2), OMA, wireline NGN(ITU-T,TISPAN,ATIS) and cable(CableLabs)

n Efficient Role & Responsibility between Standard bodies

u Lesson learned from SIP standard history in IETF

IMS Drivers (Standard)IMS Drivers (Standard)

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IMS Drivers (Standard) : ITUIMS Drivers (Standard) : ITU--T NGN T NGN

Ap

plica

tion

Sco pe o f N G N

Ma

nag

emen

t fu

ncti

on

s

T -7:T ru n kM ed ia

G a tew ay

F E

T -6 :In te r-

con n ec tio n B or d er

G atew ay F E

S-6: S .A u th en tic ation & A u th or izat ion F E

S -8 : A ccess G WC on tro l F E

N A C F R A C F

L egacyT erm in al

R G W

C u sto m er N etw ork

N G NT erm in al

L eg acyT er m in a l

A N IA pp licat io n s

S -11 : U ser S ig n alin g In te rw or kin g F E

E nd -U se r F u n ction

S -3: In terro gatin g C all S e ssion C o n tro l F E

S -1 4: M e d ia R e sou rce B roke r FE

T -17: T ran spo rtR esou rce C o n tro l F E

A cc ess P ack e t T ra n sp or t F u n ctio ns

T -2 : A ccessN o d e F E

T -1: A cce ssM ed ia

G atew ayF E

T -3: E d ge N od e F E

T -5:A ccessB or d er

G atew ayF E

S -1: S erv in g C a ll S ess ion C o n tro l F E

S -10 : B rea kou tG atew ay C o n tr o l

F E

S -1 3: M ed ia R e so u rce

C o n tro l F E

C ore P ack e t T ra nspo rt F u nction s

T -8 :M ed ia

R esou rceP rocessin g

F E

T -1 2 : T . U se r P r ofi le F E

T -4: A ccessR e lay F E

S-2: P roxy C a ll S ess ionC on tro l F E

T -10 :N etw o r k A cce ss

C o nfig ura tio n F E

S -4: S u b scrip tion L ocator F E

S -5: S . U ser P rofile F E

S -4: S u b scrip tion L ocator F E

S -5: S . U ser P rofile F E

T -16: P o licy D ecisio n F E

S -12 : N etw ork S ig n alin g

In te rw or kin g F E

T -9:S ig n allin gG atew ay

F E

S -1 5:M u ltim ed ia S er v ice F E

N G N U N I

O ther N G N

R A C F

*

T -1 4: A c cess M ana g e m en t F E

T -1 5 : H o m e G ate W a yC onf ig ura t io n F E

T -1 1:T . A uth e ntica tio n

& A ut ho riza tio n F E

T -16: P o licy D ecision F E

T -17 : T ra n sp ort R e so u rce C on tro l F E

T -13 : T . L oc a tionm a na g e m e n t F E

A p p lica tio n S up p o rt F u n c tio n s & Serv ice S u p p ort F u n ctio n s( m ay in clu d e ow n A u th en ti ca tion , A u th oriz ation an d A ccou n tin g)

o th er IP M MN etw ork

(e.g . IM S)

P S T N /IS D N

S -9 : M e d ia G W

C o n tro l F E

S -7 : In terco n n ection B ord er G a tew ay

C on tro l F E

C o re tran spor t

A ccess tran spor t

Service con tro l

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IMS Drivers (Standard) : TISPAN NGN IMS Drivers (Standard) : TISPAN NGN

Oth

er IP

Netw

ork

s

IP Transport (Access and Core)

T-MGF

I-BGF

AS

UPSF

P-CSCF

I/S-CSCF

BGCF

SLF

ChargingFunct ions

IWF

« Core IMS»

Mw

Mw/Mk/Mm

Mr

Mg

Mj

Mi

Mp MnGm

Gq

ISC

Cx Dx

DhSh

Ic

Rf/Ro

Rf/Ro

Ib

Ia

Id

PS

TN

/ISD

N

SGFMRFC MGCF

MRFP

Resource and Admission Control Subsystem

Network Attachment Subsystem

If

Ie

Mw

IBCF

Mk

Mk

UE

Ut

9

q Service Richness

Multi-User

• Voice Conferencing

• Video Conferencing

• Contents Sharing

• Community

User-to-User

• Rich Voice

• Video

• Text(IM)

• Push to Talk(PTT)

• Game

Server-to-User

• Dynamic Push Services

• Click to Chat

• Presence

• Click to Dial

User-to-Server

• MMS

• Streaming

• Contents Browsing

User-to-User

• Voice

• SMS

Number of Potential Application

Bandw

idth

Requir

em

ents

Circuit Switched

Packet Switched

IP Multimedia Subsystem(IMS)

Benefits of IMSBenefits of IMS

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q Service Interoperability

Operator 2

Service 1

Service 2

Operator 1

Service 1

Service 2

Operator 3

Service 1

Service 2

IMSOperator 2

Service 1

Service 2

IMSOperator 1

Service 1

Service 2

IMSOperator 3

Service 1

Service 2

Benefits of IMSBenefits of IMS

Different Interconnect Relations and Agreements for each service

Single Inter-Operator Relationship for each service

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Application

MediaFunctions

Charging

Auth.Security

q Resource Sharingq Cost Effective

q Horizontal Common Layer

q Total Synergy

q Roaming Enabled

Se

rvic

e 1

INPre-paid

Billing PS Domain CS Domain Interworking

SessionControl

SubscriberData

Application

IP Multimedia Subsystem

Se

rvic

e N

INPre-paid

Billing PS Domain CS Domain Interworking

q Expensive

q Repeated Vertical Integration

q No Synergy

q No Roaming

Benefits of IMSBenefits of IMS

Application

MediaFunctions

Charging

Auth.Security

Se

rvic

e 2

SessionControl

SubscriberData

Application

Application

MediaFunctions

Charging

Auth.Security

Se

rvic

e N

SessionControl

SubscriberData

Application

Media Functions

Charging Functions

Auth, Security Functions

Session Control Functions

Subscriber Data

Application Application Application

Se

rvic

e 1

Se

rvic

e 2

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IMSIMS--related History in SKT related History in SKT

q Y2004~Y2005n IMS network/services commercialized (World-First)

u Presence and Mobile IM services

u Video Telephony with supplementary features, etc

n PoC service ready for commercial launchu Regulatory problem..

n SKT hosted OMA TestFest#10 in Seoul (’05.9)u IMS PoC service tested over SKT’s commercial network

u 11 PoC client vendors and 3 PoC server vendors interworking

n BcN Trial services(Phase-1) launched u Around 10 IMS-based services developed and launched for trials

q Y2006n More commercial IMS services developed and launched

u Upgrade Mobile IM service (m-Messenger) and VT service, etc..

n BcN Trial Phase-2 launched u New IMS-based services developed

u Successful Interoperability between BcN service operators (Wireline/Wireless)

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IMS ServicesIMS Services

q Service Examplesn Real-time conversational voice services

n Point to Point interactive multimedia services, including interactive real-time voice, video and other media

n Collaborative interactive communication services

u multimedia conferencing with file sharing and application sharing, e-learning, gaming etc

n Presence/Availability and general notification services

n Group messaging services ; Instant and deferred messaging

n Push to Multimedia (PTX) services

n Content delivery/sharing services

n Combined CS and PS services

n Push-based services

n Fixed-Mobile Convergence(FMC) services

n Telecommunication-Broadcasting Convergence services

n Etc..

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Mobile IM Service[1] : Mobile Mobile IM Service[1] : Mobile NateNate--On On

p Instant Messaging(1:1 and 1:N Chatting) with buddies sharing presence information and various communication channels

p Interworking with Fixed Messenger [No.1 Messenger in Korea]

p Extended presence (Photo, Icon, Music, Location, Blog, etc)

Mobile Nate On

• Wireline/Wireless Buddy Integrated

- Wireless Buddy : Registered with mobile phone number

- Wireline Buddy : Registered with Nate ID

- Can register PC Nate On and Mobile Nate On simultaneously

PC Nate On

Interworking

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Mobile IM Service[2] : m Messenger Mobile IM Service[2] : m Messenger

p Phone-to-Phone only Instant Messaging service based on presence

p Phonebook-based communication without pre-configured buddy management

p Text, Imoticon, Flashcon, Photo sending

p Simple and Web-like UI, SMS Interworking, Storing Chatting messages

Main UI Chatting UI

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Mobile IM Service Mobile IM Service

SGSN

GGSN

WCDMA

PDSN/FA

HA

CDMA2000

ACR

WiBro, BcN Wireline

RAS

IMGW

Presence

HLRs

SCP

Subscription

IMSR

Billing

IMSCG

IMPNA/PEA

MMS SMS LBS Game UAPIS EmailBlog FixedMessenger

Existing SDPs 3rd party SPs

CSCFs, IM-SSF

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PoCPoC Service Service

q Featuresn Half duplex voice communication

n Simple UI(Hot key) without dialing

n Presence information

n Chatting

n File Transfer

q Group Managementn Basic Group (Ready-made)

n My Group

n Selected members communication

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PoCPoC Service Service

SGSN

GGSN

WCDMA

PDSN/FA

HA

CDMA2000

ACR

WiBro, BcN Wireline

RAS

Presence

HLRs

SCP

Subscription

IMSR

Billing

IMSCG

IMPNA/PEA

MMS SMS LBS Game UAPIS EmailBlog FixedMessenger

Existing SDPs 3rd party SPs

Media Server

GTS

CSCFs, IM-SSF

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Visual Communication Service Visual Communication Service

q Video Telephonyn CDMA EVDO, WCDMA, Internet WEB, BcN Wireline

n Interworking with each other (Full Mesh)

q Application Servicesn Multimedia Coloring

n Multimedia Lettering

n Multimedia Masking

n Multimedia(Contents) Sharing

n Video Mailbox

n Video Sharing

n Video Conference & Collaboration

n OSA services

u Multimedia Push interworking with Web Community, etc

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Visual Communication ServiceVisual Communication Service

SGSN

GGSN

WCDMA

PDSN/FA

HA

CDMA2000

ACR

WiBro, BcN Wireline

RAS

HLRs

SCP

Subscription

IMSR

Billing

IMSCG

ConferenceMFS

OSA AS UAPIS OSA AS Internet

Existing SDPs 3rd party SPs

Media Server

Video Mailbox OSA SCS

H.323 VT

WCDMA CSVTIMG

CSCFs, IM-SSF

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Challenges to IMS Challenges to IMS

q IMS is a great opportunity to the telecom industryn It can bring new business models to the whole members of

the telecom industry especially in the multimedia and convergence area

n It can bring cost(CAPEX/OPEX) reduction and revenue increase technically

q At the same time, it can also bring a new threat n Legacy communication services(voice,messaging) which

have been cash-cow can be overlapped and carnivalized

n Traditional value chain in the telecommunication industry is to be destroyed in appearance of Internet and IT-based new-commers

n We have to consider new strategy of partnership with various players (Operator,TEM,Solution vendor,IT vendor, 3rd party SP,Handset vendor,etc)

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Towards the Revolution.. Towards the Revolution..

q Service & Application (Killer ?!)n IMS has been more focused on technical aspects

n Majority of current IMS services are overlapped with legacy

n The biggest benefit of IMS is blended service capability, but, considering the current mobile terminal environment..

q More Convergence Needsn Not settle down in the current communication area

n Find out synergies with Entertainment, Broadcasting and Personal Intelligence areas which are emerging industries

n Use of various contents wisely

q Standard & Interoperabilityn One reason IMS is so boomed up is open standard and

flexible protocols

n But, Flexible means many variations occur

n Supplementary and value added services interworking

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Thank You