introduction of ims for 3g voice services and migration ... · pdf fileintroduction of ims for...

Introduction of IMS for 3G Voice Services

and Migration Strategies to ALL -IP Network

3GPP release 8 IMS Implementation, Deployment and TestingSophia Antipolis, France

(c) 2010 NTT DOCOMO, INC. All Rights Reserved.

Kenya Kusunose

NTT DOCOMO, INC.Core Network Development Department

24 NOVEMBER 2010

and Migration Strategies to ALL -IP Network

Agenda

1. Mobile Communication Situation in Japan

2. Network migration to IMS and ALL-IP Network

(c) 2010 NTT DOCOMO, INC. All Rights Reserved. - 1 -

Mobile Communications Situation in Japan


� Japan’s cellular market entered a mature phase : penetration rate reached over 80% and growth of net additions has slowed to half the previous level.

� DOCOMO controls a market share of 49.7% in this market.

Annual subscriber growth: 5 million

(Million subs)

100

Cellular market share

Total subscriptions: 113.7 million

Changes in market environment

Japan’s Cellular Market

As of June 2010

2.22.2％％％％％％％％


- 3 -96/3 98/3 00/3 02/3 04/3 06/3 08/3

Annual subscriber growth: 10 million

Expansionphase

Expansionphase

MaturephaseMaturephase

20

40

60

80

49.749.7％％％％％％％％28.228.2％％％％％％％％

19.9%19.9%

- 3 -

Subscriber Migration to 3G Service

No. of Subscriptions: 56.8mil.3G penetration rate: 96.6%3G ARPU : \5,200% of postpaid subs.: Over 99%(Million subs.)

DOCOMO’s 3G Growth DOCOMO’s Packet Traffic Volume

4,000

5,000

Pac

ket T

raffi

c Vo

lum

e pe

r U

ser

per

Day

3G User Packet Traffic

(Flat-rate Pake-Hodai:Launched in June, 04)

(As of 2Q/FY2010)

• Japan’s cellular phone market is one of the most ad vanced in the world, characterized by high percentage of postpaid subscriptions(over 99%) and broad adoption of 3G(over 96%) .

• 3G can accommodate larger traffic volumes compared to 2G. A growth in the packet data traffic volume indicates potential demand for data communications.

(As of Sep 2010)

(As of Sep. 2010)

57.557.557.557.5


Fiscal Year

(Million subs.)

1,000

0

2,000

3,000

Pac

ket T

raffi

c Vo

lum

e pe

r U

ser

per

Day

1999 2000 2001 2002 2003 2004

2G User Packet Traffic Volume

3G User Packet Traffic Volume

Source： Telecommunications Carriers Association (TCA), WCIS+

'01 '02 '03 '04'00 '050000

10101010

20202020

30303030

40404040

50505050

60606060

'06 '07 '08

51.151.151.151.1

23.523.523.523.5

52.152.152.152.1

30.830.830.830.8

53.453.453.453.4

43.943.943.943.9

54.654.654.654.6

49.049.049.049.0

56.156.156.156.1

53.253.253.253.2

2G(PDC)2G(PDC)

3G(W3G(W--CDMA)CDMA)

‘09Forecast

57.557.557.557.5

56.256.256.256.2

’10

Network migration to IMS and ALL-IP Network


Evolution of All-IP network ~ phased approach

Background

IT infrastructure

・Increase of data traffic- Flat-rate packet service

- High speed radio access

Lifestyle infrastructure

・Diversified radio access(3G/HSPA/LTE/…)

・Renewal of the existing switching

Service infrastructure

・Maturation of cellular market・Entrant of new players,

i.e. service providers

Phase 1IP based nodes

Phase 2IMS & SAE

Objective of All-IP network・・・・Network node cost reduction・・・・Efficient multi-access handling・・・・Service enrichment

Phase 3Service Enabler Network (SEN)


- High speed radio access ・Renewal of the existing switchingsystem


Objectives

・・・・Network node cost reduction ・・・・Simple NW structure・・・・Seamless service provision

among radio accesses・・・・VoIP → Preparation towards

LTE

・・・・Various network service provisioning with time to market and low cost

Enhance

ment

measures

Introduction of IP-based nodes using general-purpose

servers

Seamless mobility among variety of radio access (SAE)

Introduction ofService Enabler Network (SEN)

Integrated IP NW & call control among radio accesses (IMS)

Variety of Network EnablersDedicated (separated) networkfor packet domain

At start of 3G (FOMA) service in 2001• Voice services traffic was dominant and data traffic was relatively small volume.

Network needs to handle;�voice services traffic with high quality , as well as, �both voice services and data traffic simultaneously

• ATM was the best technology to realize above require ments.

ATMCore network GMSC/GGSNGMSC/GGSN

Phase 0: Pre All-IP Network (Integrated ATM Network ) (2001)

(c) 2010 NTT DOCOMO, INC. All Rights Reserved. - 7 -- 7 -

Radio access network

User equipment

RNCRNC

MSC/SGSNMSC/SGSN

BTSBTS

Integrated core networkfor both voice & data servicesVoice & Packet

IPDedicated core network

Continuous increase of data traffic�� Packet NW was separated from integrated ATM NW (around 2004)

in order to scale out the capacity easily to cope w ith increasing data traffic. �Applying IP-based nodes using routers & general-pur pose servers for packet

network

ATMCore network GMSCGMSC GGSNGGSN

Phase 1: Dedicated Packet Switch domain (2004 -05)

Dedicated core network

GMSC/GGSNGMSC/GGSN


Packet

Dedicated core networkfor data services

- 8 -- 8 -


User equipment

RNCRNC

MSCMSC

BTSBTS

SGSNSGSNVoice

Dedicated core networkfor voice services

MSC/SGSNMSC/SGSN

Evolution of All-IP network

Background

IT infrastructure










Phase 2IMS & SAE

Objective of an All-IP network・・・・Efficient data traffic handling

・・・・Multi-access handling・・・・Service enrichment

Phase 3Service Enabler Network (SEN)




Aims

・・・・Efficient data traffic・・・・Network cost reduction

・・・・Simple NW structure・・・・Seamless service provision


LTE


Enhance

ment

measures


servers




Variety of Network EnablersDedicated (separated) networkfor packet domain

ATM

CS domain

IMS introduction for 3G voice services has benefit for operator to reduce CAPEX/OPEX.• Replace traditional switch to general-purpose server base nodes.• Only PS domain required. Voice communication can be provided throu gh PS domain.• Re-use of IMS for other access systems. (e.g. LTE, NGN, WiMAX, …. ) • Smooth migration toward future LTE/4G voice communication (VoIP). • Preparation for network service enrichment by SEN on IMS (Phase 3) (introduce later)

IPCore network GMSCGMSC IMSIMS

Phase 2:Integrated All-IP NW(IMS introduction for 3 G voice, around 2010)

PS domain

GGSNGGSN S/P-GWTerminate



User equipment

MSCMSC CSCS--GWGW

Voice & Packet

BTSBTS

RNCRNC

SGSNSGSN

eNodeB LTE

MME

ATM network

Phase2:IMS introduction for 3G voice services•Migrate the 3G Circuit-Switched network configured with ATM switches to the network that processes IP-based protocols (SIP, RTP, etc.) in se rver equipment

•Process the existing radio interface and 3G radio a ccess network, without making changes , by converting them to IP-based protocols in CS-GW

•Perform unified Call ／／／／Service control in IMS �� preparation to LTE Voice call handling

HLR/HSS

AS

Bill detailsMediaServer

Service controlService controlMGW

PLMN gatePLMN gate

IMSCall controlService control

HLR Bill detailsMediaServer

ATMNW

POIPOI

Router network

TMSC


CS-GWAccommodate Accommodate 3G3G--CSCSaccessesaccesses

PLMN gatePLMN gate

GuidanceGuidance

GGSN/SGSN

CSCF

RNC RNC

Call controlCall control

Existing radiointerface

IP-based protocols(SIP, RTP)

MRF

Protocolconversion

GMSC

GGSN/SGSN

RNC RNC

MSC

GMSC

3G packet3G packet

3G packet3G packet

POIPOI

�Applying server tech.

�VoIP on core NW

�Unified call control

by IMS

TMSC

CS-GW’s function

PS

SIPfunctions SIP

To IMS through GPRSSIP

functions

•CS-GW’s function is to convert CC/MM to SIP.•With CS-GW all users can use any existing UE in IMS networks.•With the traditional method (e.g. through GPRS), us ers can only use SIP functions provided by the UE.

PS

(c) 2010 NTT DOCOMO, INC. All Rights Reserved. 12CSCF

SM/GMM

CSCF

CS-GW

UE

UE

PSfunctions

CSfunctions CC/MM

SIP

GGSN

To IMS through CS-GW

SIP functionality is NOT needed.

PSfunctions

SIPfunctions

SIPfunctions

CSfunctions

Bandwidth control to keep QoS

ASAS CSCF executes bandwidth control on each route.

INVITE

•To keep QoS of voice service in IMS network the sam e as in 3G-CS NW, the proposed IMS network adds a function to control ban dwidth virtually.

•The control is executed by bandwidth build-up based on the number of sessions. •CSCF and CS-GW build up bandwidth in response to ea ch session type (voice or AV) and control call admission.

(c) 2010 NTT DOCOMO, INC. All Rights Reserved. 13

CSCF

CS-GW

CSCF

CS-GW

Setup

INVITE

IP network

INVITE

CS-GW executes bandwidth control on a route to AR.

AR AR

ER ER ER ER

LCR LCR

CR

Aggressive schedule for migration(IMS introduction)� We just launched a plan for IMS introduction last M arch.� We will complete the plan in two years.� After completing the plan, all 3G voice services ar e controlled by IMS in DOCOMO’s

network(56 million users).

(%)

100

In Two Years

PercentComplete


100

50

0

Evolution of All-IP network

Background

IT infrastructure










Phase 2IMS & SAE

Objective of an All-IP network・・・・Efficient data traffic handling・・・・Multi-access handling

・・・・Service enrichmentPhase 3Service Enabler Network (SEN)




Aims

・・・・Efficient data traffic・・・・Network cost reduction

・・・・Simple NW structure・・・・Seamless service provision


LTE


Enhance

ment

measures


servers




Dedicated (separated) networkfor packet domain

Variety of Network Enablers

DOCOMO’s SEN (Service Enabler Network) ConceptProvide a variety of services to satisfy various us er needs with timely manner.

• SEN (Service Enabler Network) is service provision platform on top of IMS Core .• Enabler is the piece of service function that can be common ly used by multiple services. • By combining multiple enablers , realize various services (corporate, consumer , e tc.)

within reasonable time period and cost.

EnablerPresence IM Contents

sharing

RCS


ＬＴＥＬＴＥ

ＳＥＮＳＥＮＳＥＮＳＥＮＳＥＮＳＥＮＳＥＮＳＥＮ(Service(Service--Enabler Network)Enabler Network)

3G area

Combine enablers

All-IP NW

IMSCore

(Reference 1)RCS (Services provided by mutually connecting the IMS among operators in different countries: First release can realize instant messaging, presence and contents sharing by using part of SEN)

(Reference 2)Enabler is a service function part that can be commonly used by multiple services.

Combination of standardized enablers and operator-specific enablers , realizes the specialized services for operator.Standardization of the mechanism to offer value-adde d NW services is developed as the GSMA RCS release 3 . DOCOMO is leading a study group.

Example of value-added NW service

RCS Standard Enablers (Release 1)

PresencePresenceContentContentsharingsharing

Media Media Processing Processing

AA

Media Media Processing Processing

BB

Operator-specific Enablers

Instant Instant messagingmessaging . . .


Realization of Value-Added NW Services

Service Service CompositionComposition

IMSCoreIMSCore

位置情報シェアHere

Location Info. Location Info. SharingSharing

Voice callVoice call

I guess you are close now.I’m already here.Where are you , Aya? I’m at this point now!

I’m getting closer to you!

Conclusion

To live up to user’s demand to enrich the mobile services,

mobile systems are continuously evolved.

NTT DOCOMO,

– is going ahead with the migration plan to ALL-IP

network.


network.

– introduce IMS begin by applying 3G voice services.

– replace ATM network with IMS network in two years.

– provide netwok value added services using the IMS.

– Service Enabler Network(SEN) concept.

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