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IMS Solution Overview

Next Generation Network. IMS Solution Overview. In New Generation Network. S1 Teknik Telekomunikasi. Technology Evolution. IMS. 3G Wireless. IP. PSTN. 3G wireless + IP ++ Standard Services Platform Converged Applications & Content Access Independence. Wireless. Internet VoIP

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IMS Solution Overview

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  1. Next Generation Network IMS Solution Overview In New Generation Network S1 Teknik Telekomunikasi

  2. Technology Evolution IMS 3G Wireless IP PSTN • 3G wireless + IP ++ • Standard Services Platform • Converged Applications & Content • Access Independence Wireless • Internet • VoIP • Instant Messaging • Web Applications • W-CDMA • GPRS/UMTS • Circuit switched • Analog • Digital • SS7 • ISDN • Circuit switched • Analog • Digital • 2G (GSM & CDMAANSI-41)

  3. Buka kemampuan pengembangan layanan fleksibel industri TI Karakteristik Kinerja dan Skalabilitas dari solusi industri Telekomunikasi Layanan E2E standar yang diuji interoperabilitas The core of NGN (SIP-based IMS)- Combining the best of two worlds- Adding standardized E2E Multimedia services IT Telecom IMS 3

  4. Next Generation Network IP Multimedia SubsystemFunctional Elements S1 Teknik Telekomunikasi

  5. Next Generation Network IMS-Core Architecture [ETSI] S1 Teknik Telekomunikasi

  6. Next Generation Network IP Multimedia IMS Solution Overview • The IP Multimedia Subsystem is an open, standardized, NGN multi-media • architecture for mobile and fixed IP-based services. It's a VoIP • implementation based on a 3GPP variant of SIP (Session Initiation Protocol), • and runs over the standard Internet protocol. It's used by Telcos in NGN • networks (which combine voice and data in a single packet switched • network),to offer network controlled multimedia services. • The aim of IMS is not only to provide new services but to provide all the • services, current and future, that the Internet provides. In addition, users • have to be able to execute all their services when roaming as well as • from their home networks. To achieve these goals the IMS uses open • standard IP protocols, defined by the IETF. S1 Teknik Telekomunikasi

  7. Next Generation Network IP Multimedia IMS Solution Overview • The IP Multimedia Subsystem is an open, standardized, NGN multi-media architecture for mobile and fixed IP-based services. It's a VoIP implementation based on a 3GPP variant of SIP (Session Initiation Protocol), and runs over the standard Internet protocol. It's used by Telcos in NGN networks (which combine voice and data in a single packet switched network),to offer network controlled multimedia services. • The aim of IMS is not only to provide new services but to provide all the services, current and future, that the Internet provides. In addition, users have to be able to execute all their services when roaming as well as from their home networks. To achieve these goals the IMS uses open standard IP protocols, defined by the IETF. S1 Teknik Telekomunikasi

  8. Next Generation Network IMS Broadview S1 Teknik Telekomunikasi

  9. Next Generation Network BROADVIEW OF IMS ARCHITECTURE S1 Teknik Telekomunikasi

  10. Next Generation Network Service Plane Application Server (SA) • provide and executes content and services which is needed by user according to the IMS standard. • As interface with S-CSCF using SIP. • SIP-AS is the local IMS Application server. • OSA-SCS (Open Source Access – Service Capability Server) as interface with SIP-AS • IM-SSF (IP Multimedia – Services Switching Function) : interworking ofthe SIP message to the corresponding CAMEL S1 Teknik Telekomunikasi

  11. Next Generation Network Session Control Plane Home Subscriber Server (HSS) • HSS is the main data storage for all subscriber and service-related data of the IMS subscriber. • The HSS contains all the user-related subscription data required to handle multimedia sessions. Call Session Control Function (CSCF) • Proxy- CSCF (P-CSCF) • UE’s first point of contact • Authenticates and asserts an identity to the UE • Protect user privacy • Manages QoS, resource allocation, and controls charging function S1 Teknik Telekomunikasi

  12. Next Generation Network Session Control Plane • Interrogating- CSCF (I-CSCF) • Determines UE location by communicating with the HSS • Finds the appropriate S-CSCF • Performs load balancing • Hide some information such as server amount, DNS name by encrypting SIP message called THIG (Topology hiding Interface Gateway) • Serving- CSCF (S-CSCF) • Responsible for all session management activities • Retrieves user profile and authentication information from the HSS • Finds the appropriate AS • Provides SIP routing S1 Teknik Telekomunikasi

  13. Next Generation Network Media Control Plane Media Resource Function (MRF) • Media Resource Function Controller (MRFC) handles communication with the S-CSCF and controls the resources in the MRFP. • Media Resource Function Processor (MRFP) in the media plane implements all the media-related functions, such as playing media, providing announcements and mix media • Media Gateway Control Function (MGCF)receives SIP call control signal from the IMS network and performs conversion to ISUP/IP and sends to SGW. MGCF also controls MGW. • Signaling Gateway (SGW) performs signaling conversion in the transport layer and interfaces with PSTN in the control plane. • Media gateway (MGW)convert different codec from other network to the codec standard IMS. • Breakout Gateway Control Function (BGCF)determine appropriate MGCF to do call to circuit network such as PSTN and 2G. • Policy Decision Function(PDF) controlled by P-CSCF and manage QoS S1 Teknik Telekomunikasi

  14. 1 Initiate SIP Invite 2 Retrieve Subscriber Profile (if needed) 3 Apply Service Logic 9 Forward INVITE to CLD Party 4 Retrieve Address of CLD Party Home Network 10 SDP Negotiation / Resource Reservation Control LIDB/CNAM 2 4 3 9 1 12 RTP Stream RTP Stream Next Generation Network Example: Call Flow 7 Apply Service Logic to access IM-SSF AS 8 IM-SSF queries a GSM-SCF if inter-working with PLMN needed 5 Identify Registrar of CLD Party and Forward INVITE 11 Ringing / Alerting 12 Answer / Connect 6 Retrieve Subscriber Profile 13 Session Active Calling Party Home Network Called Party Home Network HSS ENUM HSS Control SCF Bearer 8 Diameter 6 Diameter 7 AS S-CSCF I-CSCF S-CSCF IM-SSF SIP 5 SIP SIP SIP Calling Party Visited Network Called Party Visited Network P-CSCF P-CSCF 11 10 Backbone Packet Network Backbone Packet Network RAN RAN UE1 UE2 13 S1 Teknik Telekomunikasi

  15. Next Generation Network Term of End-to-end connection S1 Teknik Telekomunikasi

  16. Next Generation Network BROADVIEW OF IMS ARCHITECTURE USER DATABASE S1 Teknik Telekomunikasi

  17. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • User Database • The HSS (Home Subscriber Server) is the master user database that supports the IMS network entities that are actually handling the calls/sessions. • It contains the subscription-related information, performs authentication and authorization of the user, and can provide information about the physical location of user. • A SLF (Subscriber Location Function) is needed when multiple HSSs are used. S1 Teknik Telekomunikasi

  18. Next Generation Network BROADVIEW OF IMS ARCHITECTURE Call/Session Control S1 Teknik Telekomunikasi

  19. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Call/Session Control • Several types of SIP servers, collectively known as CSCF, they are used to process SIP signaling packets in the IMS. • P-CSCF (Proxy-CSCF) • I-CSCF (Interrogating-CSCF) • S-CSCF (Serving-CSCF) • Call/Session Control 1) A P-CSCF (Proxy-CSCF) • It is a SIP proxy that is the first point of contact for the IMS terminal. • It can be located either in the visited network or in the home network. • It has terminal which will discover its P-CSCF with either DHCP, or it's assigned in the PDP Context (in GPRS). S1 Teknik Telekomunikasi

  20. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Call/Session Control • 2) I-CSCF (Interrogating-CSCF) • It is a SIP proxy located at the edge of an administrative domain. • Its IP address is published in the DNS records of the domain, so that remote servers can find it, and use it as an entry point for all SIP packets to this domain. • The I-CSCF queries the HSS using the DIAMETER Cx and Dx interfaces to retrieve the user location, and then route the SIP request to its assigned S-CSCF. • It can also be used to hide the internal network from the outside world, in which case it's called a THIG (Topology Hiding Interface Gateway). S1 Teknik Telekomunikasi

  21. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Call/Session Control • 3) S-CSCF (Serving-CSCF) • It is the central node of the signaling plane. • It's a SIP server, but performs session control as well. • It's always located in the home network. The S-CSCF uses DIAMETER Cx and Dx interfaces to the HSS to download and upload user profiles. • It has no local storage of the user. S1 Teknik Telekomunikasi

  22. Next Generation Network BROADVIEW OF IMS ARCHITECTURE Application Server S1 Teknik Telekomunikasi

  23. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Application Servers • Application servers (AS) host and execute services, and interfaces with the S-CSCF using SIP. • Depending on the actual service, the AS can operated in SIP proxy mode, SIP US mode or SIP B2BUA mode. • An AS can be located in the home network or in an external third-party network. S1 Teknik Telekomunikasi

  24. Next Generation Network BROADVIEW OF IMS ARCHITECTURE Media Servers S1 Teknik Telekomunikasi

  25. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Media Servers • MRF (Fungsi Sumber Daya Media) menyediakan sumber media di jaringan rumah. • Ini digunakan untuk Memutar pengumuman, konferensi Multimedia, percakapan Teks-ke-ucapan (TTS) dan pengenalan suara, transkode waktu nyata dari data multimedia. • Setiap MRF dibagi lagi menjadi: • 1) MRFC (Media Resource Function Controller) adalah simpul bidang pensinyalan yang bertindak sebagai Agen Pengguna SIP ke S-CSCF, dan yang mengendalikan MRFP dengan antarmuka H.248. • 2) MRFP (Media Resource Function Processor) adalah simpul bidang media yang mengimplementasikan semua fungsi terkait media. S1 Teknik Telekomunikasi

  26. Next Generation Network BROADVIEW OF IMS ARCHITECTURE Breakout Gateways PSTN gateways S1 Teknik Telekomunikasi

  27. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • Breakout Gateway • A BGCF (Breakout Gateway Control Function) is a SIP server that includes routing functionality based on telephone numbers. • It's only used when calling from the IMS to a phone in a circuit switched network, such as the PSTN or the PLMN. S1 Teknik Telekomunikasi

  28. Next Generation Network BROADVIEW OF IMS ARCHITECTURE • PSTN Gateways • A PSTN/CS gateway interfaces with PSTN circuit switched (CS) networks. • A SGW (Signalling Gateway) interfaces with the signalling plane of the CS. It transforms lower layer protocols as SCTP into MTP, to pass ISUP from the MGCF to the CS network. • A MGCF (Media Gateway Controller Function) does call control protocol conversion between SIP and ISUP, and interfaces with the SGW over SCTP. • A MGW (Media Gateway) interfaces with the media plane of the CS network, by converting between RTP and PCM. S1 Teknik Telekomunikasi

  29. Protocol dalam IMS • Signalling • SIP (Session Initiation Protocol) • Merupakanapplication-layer protocol yang dapatmelakukanfungsipembangunan, modifikasidanterminasi multimedia session • Merupakanopen standard, text based protocol dari IETF • Dipilihsebagai main protocol di IMS karenafleksibilitasdankecepatanpengembangannya • Digunakanuntukberkomunikasidenganhampirseluruh element di IMS (CSCF, MGCF, BGCF, AS, IMS Client) • Diameter • Merupakan application-layer protocol untukfungsi AAA • Merupakan open standard, text based protocol dari IETF • Digunakanuntukberkomunikasiantara HSS-CSCF dan HSS-AS • Media • RTP (Real-time Transport Protocol) • Merupakanprotocol network untukmenyampaikan media audio & video over IP Networks • Merupakanopen standard dari IETF

  30. Next Generation Network IMS- Signalling flow S1 Teknik Telekomunikasi

  31. Registration Flow 2. 2nd register message 1. Initial register message • Proses registrasi user dilakukan 3 kali : HSS-A HSS-A (1.) Implicit Registration (2.) Re-registration (3.) 3rd Party Registration (6) Authentication Data (15) User profile S-CSCF-A S-CSCF-A (4) Assign S-CSCF (13) Assign S-CSCF (5) Register (14) Register I-CSCF-A I-CSCF-A (7) 401 (16) 200 OK (3) Register (12) Register (8) 401 (17) 200 OK P-CSCF-A P-CSCF-A DNS DNS (2) DNS query (11) DNS query (1) Register (10) Register (9) 401 (18) 200 OK UE UE

  32. Registration Flow Diameter message

  33. P-CSCF S-CSCF S-CSCF I-CSCF Simple Model for Call Flow Procedure MT MO SS Callee part 3.request 4.request Caller part 5.request 2.request DNS/ENUM HSS P-CSCF 6.request 1.request media Signalling Media

  34. Establishment of Sessions – IMS Session Without AS With AS Callee part Callee part Caller part Caller part AS-A HSS-B S-CSCF-A I-CSCF-B Invite AS-B HSS-A 183 HSS-B Invite 4 Invite 3 Invite 8 Invite 7 Invite 183 I-CSCF-A Invite 5 Invite 6 Invite S-CSCF-A DNS/ENUM S-CSCF-B S-CSCF-B HSS-A 183 183 183 I-CSCF-B P-CSCF-B Invite 183 Invite 2 P-CSCF-A Invite 9 183 183 I-CSCF-A P-CSCF-B DNS/ENUM P-CSCF-A Invite Invite Invite 10 183 183 183 183 Invite 1 IP media IP media

  35. IMS Session Signaling Flow

  36. Establishment of Sessions : IMS – PSTN/PLMN user PSTN/PLMN User Initial Call to IMS User IMS User Initial Call to PSTN/PLMN User

  37. Posisioning IMS

  38. Leveling Network IMS – Voice Service(Work-flow Integrasi Network IMS - Layer_2 keatas) Network DCN Service Control Layer (IMS) Transport Metro-e Akses Layer

  39. Arsitektur IMS TELKOM

  40. Next Generation Network Thanks You rendy_munadi@yahoo.co.id S1 Teknik Telekomunikasi

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