IP Multimedia Subsystem and Next-Generation Networks
Explore the evolution of telecommunications with IP Multimedia Subsystem services, a shift towards user-centric paradigms, and the characteristics of Next-Generation Networks. From changing service perceptions to the implications of NGN softswitch architecture, discover how technologies like VoIP, SMS, MMS, and more are shaping modern communication landscapes.
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Presentation Transcript
Services Change of service perception paradigm Voice Low speed data modems (V.90) Old Network centric oriented New User centric oriented + other PC and software SMSMMS VoIP http DVB-H smtp ftp
Pohad na sluby Customers are people they want it all, now! Any & all media (voice, video, data, web ) Any & all terminal (phone, PDA, laptop, cell phone ) Any & all network (POTS, ISDN, IP, WiFi, GPRS, UMTS ) Any & all time Any & all places 1 to 1 or 1 to many Mixing synch & asynch Security Quality affordable
Different worlds... - Classical public telephony network - PSTN QoS is supported natively Central Control Central Control Central Control User User SW SW SW SW SW SW UNI NNI NNI UNI - Internet Selected server Selected server Internet = best effort Internet R R User User R R Dumb net
NGN softswitch architektra oddelenie vrstvy slu ieb od riadiacej a transportnej vrstvy paketov prenos d t otvoren a normalizovan rozhrania medzi jednotliv mi vrstvami podpora viacn sobn ch aplik ci cez r zne pr stupov siete a koncov zariadenia IETF
NGN softswitch architektra - implikcie Telefonica DE
NGN Charakteristiky NGN, ktor by mala sp a : Oddelenie riadiacich funkci od prenosov ch vlastnost . Oddelenie poskytovania slu ieb od siete a zabezpe enie pr stupu cez otvoren rozhrania a t m flexibiln , otvoren a distribuovan architekt ru. Vysokokapacitn paketov prenos v r mci prenosovej infra trukt ry, av ak s mo nos ou pripoji existuj ce i bud ce siete ( i u siete s prep nan m paketov, siete s prep nan m okruhov, spojovo, i nespojovo orientovan , pevn aj mobiln ) Podporu pre irok spektrum slu ieb a aplik ci s pou it m mechanizmov zalo en ch na modul rnej a flexibilnej trukt re stavebn ch blokov element rnych slu ieb Konvergovan slu by medzi pevn mi a mobiln mi sie ami (taktie konvergenciu hlasu, d t a videa). R zne kateg rie slu ieb s potrebou rozdielnych QoS a tried slu ieb (CoS) Nez vislos evol cie slu ieb od pou vanej transportnej infra trukt ry R zne typy mobility (pou vate ov, termin lov, slu ieb). Neobmedzen pr stup pou vate ov k r znym poskytovate om slu ieb Jednotn riadiaci protokol SIP (Session Initiation Protocol) Dodr anie regula n ch po iadaviek ako napr klad n dzov volania a bezpe nostn po iadavky pri zachovan ochrany osobn ch dajov Lacnej ie a efekt vnej ie technol gie v porovnan so s asn mi technol giami
Standarts: Path to IMS Standarts: Path to IMS
Modern architectures for modern services IMS the Standart for Converging Networks
Architektra NGN, SSW a IMS IMS Home Network - Functional Elements Home Subscriber Server Centralized DB HLR successor User profile Filter criteria (sent to S-CSCF) Which applications Which conditions Application Servers Push-to-talk Instant messaging Telephony AS 3rd party or IMS Vendor Media Resource Function Controller Pooling of Media servers (e.g. conference) Domain Name Server Home Network UA/UE SIP ASASAS DNS ENUM P-CSCF HSS Media Gateway Control Function Interfaces to PSTN/PLMN by Converting SIP <-> ISUP Interworking RTP to circuit H.248 control of MGW Diameter SIP SIP SIP MRFC P-CSCF I-CSCF S-CSCF SIP UA/UE MS MS SIP SIP SIP SIP MGCF BGCF ISUP Call Session Control Function SIP registration SIP session setup SIP H.248 SS7 PSTN RTP TDM MGW Serving CSCF Registrar Session control Application Interface Proxy CSCF 1st contact point for UA QoS Routes to S-CSCF Visited Network Interrogating CSCF Entry point for incoming calls Determines S-CSCF for Subscribers Hides network topology Breakout Gateway Control Function Selects network (MGCF or other BGCF) in which PSTN/ PLMN breakout is to occur Konvergovan siete a NGN
NGN IMS funkn architektra Mgt. & Charging Applications Application Servers Mobile Features Application Servers SCIM Session Control HSS S-CSCF BGCF Border & Media Control Media Services SGW MGCF/ MGW PSTN/ PLMN P/I-CSCF THIG Other VoIP Network Access Subscriber
NGN funkn entity IMS architektry CSCF Call Session Control Function PROXY-CSCF The P-CSCF is the first entry point for the user equipment (UE) into the IMS. INTERROGATING-CSCF The I-CSCF is used for initially choosing the correct S-CSCF. SERVING-CSCF The S-CSCF handles call session state in the IMS, including coordinating the use of Application Servers for enhanced services. Also, it is the subscriber registrar and is always in the home network. BGCF The Breakout Gateway Control Function routes calls to the public switched telephone network (PSTN) or any other circuit-based network. MGCF/MGW The Media Gateway Control Function/ Media Gateway handles media to and from the PSTN. SGW - The Signaling Gateway passes circuit-based signaling to and from the PSTN. AS An Application Server (i.e., SIP AS, OSA AS, or CAMEL IM-SSF) offers value-added services and resides in the user s home network or in a third party location. An AS based in the home network can access the HSS as needed. HSS The Home Subscriber Server is the master database for subscriber data, containing subscription-related information to support call processing network entities. The HSS interfaces with call control servers in order to complete routing/roaming procedures by authentication, authorization, naming/ addressing resolution, location dependencies, etc.
IMS vvoj Vyvinul sa v mobiln ch sie ach (ako 3GPP tandard) 2G siete podporovali (takmer iba) prenos hlasu (circuit-switch) aplik cie 3G siete mali nat vnu podporu pre prenos d t pomocou paketov Pou vatelia maj pr stup k r chlemu Internetu => Pou vatelia u nepotrebuj hlasov slu by od oper tora!!!
Preo nepouvame Internet Internet poskytuje v etko VoIP lacn telefonovanie Slu by spojen s ISDN Pre o potrebujeme NGN? Internet neposkytuje: Garanciu QoS Spoplatnenie Mo nos integr cie r znych slu ieb
Naozaj potrebujeme QoS V inou funguje dobre Niekedy nefunguje v bec... Nepr pustn pre firmy Riadenie QoS je aj o u van si slu by s garanciou kvality ako o hnevan sa s lacnou slu bou V s asnom Internete nie je snaha rozli ova slu by
Naozaj potrebujeme Spoplatnenie? Vytvori spravodliv model spoplatnenia Ke pou vate pozn obsah d t, m e zv hodni ist slu bu (Videokonferenciu napr.) aj ke by bola tandardne ve mi drah N klady s fixn , pr jmy sa odv jaj od skonzumovan ch slu ieb NGN nen ti pou itie konkr tneho spoplat ovacieho modelu Napr. spoplatnenie IM bez oh adu na mno stvo prenesen ch d t, spoplatnenie mult. rel cie na z klade trvania
Naozaj potrebujeme Integrovan sluby? Multimedi lne slu by u nesta ia Cie om je ma otvoren prostredie na v voj aplik ci a ich vz jomn integr ciu Ke mi pr de voice-mail, chcem inform ciu e-mailom Oper tori chc poskytova aj internetov slu by Tieto slu by musia fungova rovnako dobre v roamingu ako aj v dom cej sieti Moja slu ba funguje (rel cia) bez oh adu na pr stupov technol giu (m inform cie o nej) Slu by by mali navy e fungova medzi Internet pou vate om a IMS pou vate om
IMS - protokoly SIP Diameter RTP a RTCP
NGN IMS architektra Tispan
Identity v IMS V PSTN bola identita jedna. Verejn identita sip:meno.priezvisko@operator.sk sip:+421-902-111222@operator.sk tel:+421-902-111222 Tel uri nem e by registrovan v SiP serveri Priv tna identita meno@operator.sk Je pou van iba pre autentifik ciu a identifik ciu pou vate ov Pou vate zvy ajne nepozn (ako IMSI) Nom e sa pou va pre potreby SIP signaliz cie
Relations between Identities Public UID 1 }Implicit Set Private UID 1 Public UID 2 IMS Subscriber Private UID 2 Public UID 3 . . . Public UID n
SIP Application Servers CDMA 2000 SIP Application Servers DSL/Cable Modem HSS IMS I-CSCF MRF DSLAM/CMTS P-CSCF MGCF S-CSCF MGW WLAN MSC(Server) RNC SGSN GGSN Corporate BSC CN UMTS/GPRS MGW Tispan
Registration procedure 1 www.tech-invite.com
Registration procedure 2 www.tech-invite.com
Registration procedure 3 www.tech-invite.com
Registration procedure 4 www.tech-invite.com
Architektra NGN, SSW a IMS IMS Subscriber to IMS Subscriber high level call flow 1 Initiate SIP Invitation 6 Retrieve Subscriber Profile (if needed) 2 Retrieve Subscriber Profile (if needed) 7 Apply Service Logic 3 Apply Service Logic 8 Forward INVITE to CLD Party 4 Retrieve Address of CLD Party Home Network and Forward INVITE. 9 SDP Negotiation / Resource Reservation Control 10 Ringing / Alerting 5 Identify Registrar of CLD Party and Forward INVITE. 11 Answer / Connect Calling Party Home Network Called Party Home Network DNS HSS HSS Control Bearer 2 6 Diameter Diameter Diameter 4 5 3 7 AS AS S-CSCF I-CSCF S-CSCF SIP SIP 8 SIP SIP Calling Party Visited Network Called Party Visited Network P-CSCF P-CSCF 11 10 1 Backbone Packet Network Backbone Packet Network 9 RTP Stream RAN RAN UE UE Konvergovan siete a NGN
Filtering Only initial SIP requests Initial filter criteria (iFC) retrieved from HSS during registration Subsequent filter criteria (sFC) provided by application server (beyond 3GPP R8) Allow dynamic definition of trigger points during application runtime
Example: Presence call flow Service profile assigned to users that want to use presence IFC AS: Presence Server TP: CNF (&) Method and PUBLISH or SUBSCRIBE Event Header: Event Content: .*presence.* Presence Server SUBSCRIBE NOTIFY 200 OK 200 OK SUBSCRIBE 200 OK NOTIFY SUBSCRIBE 200 OK NOTIFY P-CSCF S-CSCF UE 200 OK 200 OK
