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1 IMS-based Network Convergence : Architecture and QoS Sungwon Lee / Ph.D Mobile WiMAX Solution Team, TN-Division ( drsungwon@samsung.com) KRnet 2006, Seoul

2 Contents Ice Break What's Going On? Where We Are? IMS Overview IMS Technology Conclusion 1/39

3 Ice Break 2/39

4 Ice-Break Question.1 Who is Telco Operator, and its Telco Services? U-Operator Presence Instant Messaging VoIP Conference Call File Transfer Voice Mail V-Operator Presence Instant Messaging VoIP Conference Call File Transfer Voice/Photo Mail PSTN/Cellular Voice Video Contents Game Contents Ring-Back-Tone Wall-Paper Scheduled Call Forwarding Call-ID/Call Management Address-Book Management Calendar/Schedule Mgnt. W-Operator Presence Instant Messaging VoIP Conference Call File Transfer Voice Mail SMS Information Query Internet/Desktop Search Satellite Image Navigation MAP Service (Text) Language Translation Personal Blog Word/Excel/Presentation Photo Edit/Share 3/39

Voice/Photo Mail PSTN/Cellular Voice Video Contents Game Contents Ring-Back-Tone Wall-Paper Scheduled Call Forwarding Call-ID/Call Management Address-Book Management

5 Ice-Break Question.2 What terminal type are used by Telco Operators? U-Types V-Types W-Types Desktop PC Notebook PC Dual-mode Phone WiFi Phone Bluetooth Phone DECT Phone Desktop PC Notebook PC Dual-mode Phone PSTN Phone Cellular Phone Desktop PC Notebook PC 4/39

6 Ice-Break Question.3 What terminals are used by Telco Operators? 5/39

7 Ice-Break So What? 시사점 IT와 Telco의 서비스를 구분하기 어려운 세상의 도래 유선/무선/IT 단말의 경계가 무너진 세상의 도래 데이터 특성에 적응하는 무선/복합 단말 시대의 도래 6/39

8 Ice-Break Is Korea different? 종합미디어그룹 표방 Domestic A-Operator IHQ 지분 인수 통한 연예기획/게임개발/영화제작/드라마제작 연계 음반업체인 YBM서울음반 인수 및 자사 음악서비스 연계 TU 미디어통한위성DMB 개시 Domestic B-Operator 그룹 차원의 콘텐츠사업 협의회 출범 MP3 음원 포탈 강화 게임 포탈 강화 삼성전자제휴통한홈네트워크및컨텐츠사업부문강화 BcN, VoIP, WLAN, WiBro 통한 유무선 통합 사업자 추진 (Reference : 일간 디지탈타임즈) 7/39

YBM서울음반 인수 및 자사 음악서비스 연계 TU 미디어통한위성DMB 개시 Domestic B-Operator 그룹 차원의 콘텐츠사업

9 What s Going On? 8/39

10 What s going on? Sad history in our country Chapter 1 ISDN 음성/데이터/영상/ 멀티미디어 통신 시대를 열자! ATM 음성/데이터/영상/ 멀티미디어 통신 시대를 열자! 현재 왜 10년넘도록같은 이야기를 해야 하지? Chapter 2 ISDN 1:N, M:N 통신 시장을 열자 ATM 1:N, M:N 통신 시장을 열자! 현재 왜 1:N, M:N 통신 시장이 안 열릴까? 9/39

11 What s going on? Some history of neighbor country Chapter 1 협대역 IP TCP/IP 인터넷 기술을 만들어 보자 광대역 IP 광대역 IP 망과 SIP으로 뭔가 잼있는 걸 해보자. 현재 음성/데이터/영상/ 멀티미디어 통신 시대를 열자! Chapter 2 협대역 IP 간단한 문자나 몇줄 보내보자 광대역 IP IM으로 1:N, M:N은 자연스러운 통신 방법/수단 현재 문자외 음성/멀티미 디어 컨텐츠의 1:N, M:N 통신을 하자! 10/39

12 Where We Are? 11/39

13 Where are we going? Solutions Telco vs. IT? WAR OR PEACE Make your choice! 12/39

14 Where are we going? Telco meets IT Telco 요구 IT 요구 표준화된 서비스 및 인터페이스 안정된 QoS 보장 방안 다양한 과금 방안 신뢰성 있는 보안 방안 국제/국내 사업자간 로밍 방안 수익성 있는 서비스 제공 표준화된 서비스 및 인터페이스 개방형 개발 환경 신속한 제품/서비스 적용 용이 국제/국내 사업자간 호환 용이 QoS/과금/보안 기능 기본 제공 IMS 통한 Telco와 IT의 IP 기반 컨버전스 13/39

15 IMS Summary IMS는 Telco 입장에서 정의한 표준화된 SIP서비스, 과금 및 QoS 제어 규격 SIP Protocol Standard Service Integrated Billing IMS (VoIP & SIP Service as Killer Application) Standard All-IP Mobile Service Standard User/Service QoS Wireline Extension (ITU/ETSI) 3GPP2 CDMA2000 3GPP WCDMA WiBro OMA WiFi & Others Wireline NGN/BcN OMA : Open Mobile Alliance 14/39

All-IP Mobile Service Standard User/Service QoS Wireline Extension (ITU/ETSI) 3GPP2

16 IMS Overview 15/39

17 IMS Characteristics Initially Defined by 3GPP Builds on IETF protocols All-IP protocols Service & Control Mixed Multimedia Access Independent (Fixed & Mobile) 16/39

18 IMS Standard History 2002 Jun. : 3GPP Rel.5 Closed - First & Base IMS platform 2004 Dec. : 3GPP Rel.6 Closed - Basic converged services 2005 Now : 3GPP Rel.7 Going - Emergency calls, Enhanced QoS, FMC ETSI/TISPAN working for fixed IMS OMA standardizing IMS services 17/39

19 IMS Standard Group Relationship 18/39

20 IMS Layered Architecture Old Fashion IMS Style 19/39

21 IMS Interoperable & Manageable Service Standardized environment for operators to manage IP multimedia communication sessions IMS IMS Services Services IMS IMS Application Application Servers Servers Presence Instant Message VoIP Game PoC And so on Platform for application and service development Access network independent Approach to managed and cost-effective transition towards service centric world IMS IMS Core Core Network Network IP IP Core Core Network Network Access Access Network Network IMS IMS Terminal Terminal Equipment Equipment Authentication Session Control Charging QoS Roaming Security TeliaSonera (Reference : IMS Conference Asia 05) 20/39

22 IMS Standard Services Presence-based services Instant messaging Voice Telephony (VoIP) Video Telephony Push-to media services (push-to-talk/view/video) Content sharing / data transfer Group chat Multimedia Streaming Web Browsing Multiparty gaming PIM services, such as calendars and alerts Multimedia (Audio/Web/video) conferencing.. And the list goes on 21/39

23 Benefits from Operator Perspective FOCUS ON YOUR REVENUE CREATION!! Single sign-on user authentication One user data base / subscription handling One multimedia session control One billing interface & differentiated charging One QoS interface & differentiated quality One common foundation for fixed, mobile and enterprise Pervasive standard based terminals, and systems Smooth evolution of services 22/39

24 Benefits from Developer Perspective FOCUS ON YOUR CORE COMPETENCE!! Enabling affordable, accelerated development and deployment Manageable quality of service Roaming freedom High degree of interaction between mobile & fixed-line users 23/39

25 IMS Technology 24/39

26 IMS Basic Components Overall Visited Home Domain Domain Proxy-CSCF First contact point Sh Provides provicy control and QoS authorization Local services, like emergency calls and local SLF HSS numbering Dx Cx Cx ISC compression Diameter Gm Mw Mw UA P-CSCF I-CSCF SIP SIP SIP Interrogating-CSCF Accesspoint to domain Hides topology and configuration S-CSCF Mi BGCF Serving-CSCF Session control services Registration, AS usage, charging, etc AS SIP Mr MRFC SIP Megaco Mg Mj MGCF MRFP Mc MGW 25/39

27 Home Subscriber Server (HSS) HLR Subscriber registration information management until Rel.4 HSS Feature enhancement for IM CN Subsystem (includes AAA function) HLR is subset of HSS 26/39

28 MGW (MGCF & IM-MGW) MGCF (Media Gateway Control Function) Performs protocol conversion between ISUP and the IM subsystem call control protocols. Controls the parts of the call state that pertain to connection control for media channels in an IM-MGW. Communicates with CSCF. Selects the CSCF depending on the routing number for incoming calls from legacy networks. IM-MGW MGW on IMS as like CS-MGW on CS Domain in R 4 27/39

29 Multimedia Resource Function (MRF) MRF = MRFC (Control Plane) + MRFP (Bearer Plane) Multimedia conference control Media conversion, mixing, trans-coding and processing Multimedia message replay Voice mail service Tone announcement 28/39

30 Service Interface Native SIP services SIP AS는 S-CSCF와 SIP interface를 통해 서비스제공 CPL 또는 JAVA API 로 작성 Legacy IN services CAMEL (Customized Applications for Mobile Enhanced Logic) IM-SSF : interface between ISC and CAP 3rd party services OSA AS (Open Service Access Application Server) OSA SCS: interface between ISC and OSA API 29/39

31 IMS Architecture (Case: IMS to IMS) Control Plane Traffic Plane IMS P-CSCF I-CSCF Mw Cx S-CSCF HSS Cx The HSS holds the IMS I-CSCF service profile of the subscribers. Mm Other IP/ IMS network UE UTRAN SGSN Go Gi GGSN CSCFs are the IMS entities responsible of the call control: there Gi are 3 types of CSCFs depending on their role: P-CSCF (Proxy CSCF) S-CSCF (Serving CSCF) I-CSCF (Interrogating CSCF) The PS domain provides the IP bearer to access to the IMS, i.e. a PDP context. S-CSCF interconnects to external IP networks and other IMS networks. If THIG is used by the operator to hide its internal configuration, the connection to external networks goes through an I-CSCF. PS Domain Ref) Steve TSANG-KWONG-U, France Telecom 30/39

32 IMS Architecture (Case: IMS to PSTN) Control Plane Traffic Plane In Release 6, the PDF can be separated from the P-CSCF. Those two entities are then connected through the Gq interface. UTRAN PDF IMS Go I-CSCF Mw The MRF is used for P-CSCF multiparty call control Gq Go Gi Gi Gi MRF Cx S-CSCF Mr IMS- MGW Mn HSS Cx Mg Mi MGCF I-CSCF Mm Mj SGW Mk BGCF Other IP/ IMS network Those entities are responsible for interworking between IMS and CS domain/pstn UE PS Domain SGSN GGSN Legacy/ PSTN 31/39

33 IMS Architecture (Case: Off-line Charging) Control Plane Traffic Plane Rf IMS I-CSCF HSS I-CSCF Other IP/ IMS network CCF P-CSCF S-CSCF CGF Ga Gz MRF BGCF UTRAN PDF IMS- MGW MGCF SGW UE PS Domain SGSN GGSN For offline Charging, CCF and CGF are responsible for collecting charging information from PS domain and IMS entities. Legacy/ PSTN 32/39

34 IMS Call Flow Example (Case: IMS to IMS) Home B Home A HSS HSS CX-Query Resp 3. CX-Query S-CSCF 9 14 I-CSCF 6 15 S-CSCF 5. Invite 16. OK I-CSCF Invite P-SCSF Visited B Visited A P-CSCF GGSN SGSN Radio Access Network 18 GGSN SGSN Radio Access Network 1. Invite B A Traffic Path Signaling Path 33/39

35 QoS in IMS SDP SDP Inspection MS SDP P-CSCF SDP inspection performs based on Local Policy. S-CSCF SDP inspection performs based on Local Policy or User Subscription AS AS checks SDP and request confirmation for the resource reservation at the endpoint. HSS/AAA Operator based Policy Information transfer to the S-CSCF when Registration-time 34/39

36 Conclusion 35/39

37 More? Why Service? (Case: TeliaSonera) Today s revenues mainly from access Role of access decreasing Price pressure, cost-efficiency Value moving towards services Services main differentiator Multiple services rather than one killer application Shorter service life-cycles Service management and delivery in essential role Terminals have key role in ensuring end-to-end QoS Terminal diversity challenge IMS as a future platform for service development (Reference : IMS Conference Asia 05) 36/39

38 More? Why Service? (Case: France Telecom) Offer clients a New Experience in Telecom services Give access to a whole world of services A new generation of telecom services to change our everyday lives Change means providing both high value and simplicity Move from access to networks to access to services (Reference : NExT Vision Presentation, June 05) 37/39

39 More? Why Service? (Case: British Telecom) (Reference : IMS Conference Asia 05) 38/39

40 Final Vision Fast, Reliable and QoS Guaranteed Seamless Active Handoff CDMA2000 1X/DO/DV WCDMA/ HSDPA Mobile WiMAX WLAN Bluetooth/ UWB Always Best Connected Ubiquitous Networks & Services 39/39

41 Thank you!

歯I-3_무선통신기반차세대망-조동호.PDF

歯I-3_무선통신기반차세대망-조동호.PDF KAIST 00-03-03 / #1 1. NGN 2. NGN 3. NGN 4. 5. 00-03-03 / #2 1. NGN 00-03-03 / #3 1.1 NGN, packet,, IP 00-03-03 / #4 Now: separate networks for separate services Low transmission delay Consistent availability