IP Based Multimedia Services Platform
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1 IP Based Multimedia Services Platform Stephen Hayes Chair TSG-CN
2 Topics to be Covered IMS Motivation and Overview IMS within the 3GPP Architecture/Components of IMS Services Built upon IMS Sources for More Information 2
3 IP Multimedia Session Domain Multimedia Service Platform based upon internet protocols SIP/SDP Diameter COPs IPv6 Independent of Radio Access Technology 3GPP currently uses WCDMA, GRPS, EGPRS Independent of underlying IP Transport Technology 3GPP currently uses GPRS as IP Transport Developed in 3GPP Work begun in mid 1999 Called IP Multimedia Subsystem by 3GPP Replacement of term All-IP 3
4 Advantages of IMS Unified Handling of All Information Combining Applications Easy Mixing of Media and Parties Flexibility in Resource Utilisation Mix of Network and Terminal Based Resources No Binding to specific providers Open Interfaces Sourcing applications from anywhere Common for all user equipment and all application servers Access Convergence 4
5 IMS Overview SIP/ SDP SIP/ SDP IP Transport Problems with the end-to to-end model: QoS Fraud/Privacy Voic , forwarding, conf calling CS interworking Charging IMS uses SIP/SDP End to end protocols 5
6 IMS activities in 3GPP SA SA1 Services SA2 Archecture SA3 Security SA4 Codecs SA5 Charging // OAM CN CN1 "SIP" CN2 "IM-SSF" CN3 "Interworking & QoS/ bearer" CN4 "Cx i/f" "Sh i/f" "Si i/f" CN5 "OSA" GERAN UTRAN 6
7 IMS activities in 3GPP SA SA1 Services SA2 Archecture SA3 Security SA4 Codecs SA5 Charging // OAM Services Requirements VHE/OSA service requirements architecture & high level information flows (includes QoS) VHE/OSA arch. Access Security for Legal Intercept recommended codecs for Charging aspects for 7
8 IMS activities in 3GPP SA SA1 Services SA2 Archecture SA3 Security SA4 Codecs SA5 Charging // OAM Services Requirements VHE/OSA service requirements architecture & high level information flows (includes QoS) VHE/OSA arch. Access Security for Legal Intercept recommended codecs for Charging aspects for 8
9 IMS activities in 3GPP CN CN1 "SIP" CN2 IM-SSF CN3 "Interworking & QoS/ bearer" CN4 "Cx i/f" "Sh i/f" "Si i/f" CN5 "OSA" Detailed Information Flows from SIP Protocol for SIP SIP-CAP for IM-SSF Bearer and QoS protocol wrapping Go interface (local policy) Cx, Sh, Dx interface OSA-APIs for IP multimedia Call/session State Model CS-IMS interworking 9
10 IMS activities in 3GPP CN CN1 "SIP" CN2 IM-SSF CN3 "Interworking & QoS/ bearer" CN4 "Cx i/f" "Sh i/f" "Si i/f" CN5 "OSA" Detailed Information Flows from SIP Protocol for SIP SIP-CAP for IM-SSF Bearer and QoS protocol wrapping Go interface (local policy) Cx, Sh, Dx interface OSA-APIs for IP multimedia Call/session State Model CS-IMS interworking 10
11 IMS activities in IETF SIP WG SIP SIPPING WG SIP Security -ipsec - pki others AAA / Diameter MMMUSIC SDP IPv6 Robust Header Compression (rohc) 11
12 Harmonized IMS Reference Model Packet Data Subsystem Mb/36/38 Mb/32/37 Go/28 MRFP MRFC PDF Mb/42 Mp/25 Mm/tbd Mr/24 Mw/ dd/ff 23 Mk/tbd CSCF Mb/33 Mi/ee Cx/16 Mj/17 ISC/12 Mg/17 W Mc/30 CF OSA-SCS Mb/34 PSTN/26 OSA PDN PSTN / PLMN OSA-AS UA Control Bearer Radio Access Network Blue = 3GPP definition Red = 3GPP2 definition Black = Common definition Green = Not Common 3 AAA Databases Home Subscriber Server Sh/7/11 IP Core Network Multi-media Session Domain (IMS) 4 SIP-AS For 3GPP, the PDF is within the P-CSCF. For 3GPP2, the PDF is a network entity of it s own. For 3GPP the HSS also contains HLR functionality which is not shown here. For 3GPP2 the AAA function shown in the HSS is a stand-alone entity. Additional interfaces exist in both the 3GPP and 3GPP2 reference models but are not included in this proposal for harmonization. 12
13 IMS Architecture Session Control Function P-CSCF S-CSCF I-CSCF - Call First SIP Entry proxy Session point providing of to contact Control home for network the Function the access mobile to the station -network Provides Proxy Performs SIP based basic a messages mapping services home of for session the static subscriber handling DNS - mapping using (number the to internat n) SIP the - dynamically (enforce policy allocated in GGSN) S-CSCF (HSS helps) IMS-SSF MRFP SIP-AS MRFC I-CSCF OSA-SCS SLF S-CSCF HSS WCDMA Network GGSN P-CSCF CF CF PSTN CS Domain Home Network 13
14 IMS Architecture - Databases HLR SLF -IMS- Provides Subscriber means to Database locating the HSS for the -Registration/Location indicated subscriber. Data -Service Data -Evolved from HLR IMS-SSF MRFP SIP-AS MRFC I-CSCF OSA-SCS SLF S-CSCF HSS WCDMA Network GGSN P-CSCF CF CF PSTN CS Domain Home Network 14
15 IMS Architecture Interface to Legacy Networks CF - Performs Select either an bearer CF interworking signalling operators interworking network, between RTP/IP or between an CF/ and the the IMS bearers and in used another PSTN/ISDN/PLMN in the network PSTN/ISDN/PLMN -networks. May drop out of the networks. signalling -Controls after the session establishment connections IMS-SSF MRFP SIP-AS MRFC I-CSCF OSA-SCS SLF S-CSCF HSS WCDMA Network GGSN P-CSCF CF CF PSTN CS Domain Home Network 15
16 IMS Architecture Media Resources MRFC MRFP - Provides Controls the media media stream processing resources in the resources MRFP for e.g. media - Interprets mixing, the media announcements, commands from the media analysis applications... to control the MRFP IMS-SSF MRFP SIP-AS MRFC I-CSCF OSA-SCS SLF S-CSCF HSS WCDMA Network GGSN P-CSCF CF CF PSTN CS Domain Home Network 16
17 IMS Architecture Service Platforms OSA-SCS IMS-SSF SIP-AS - Allows the operator access to to provision the provide existing SIP network based CAMEL based services. OSA based services - Not evolved for IMS for users. IMS. IMS-SSF SIP-AS OSA-SCS HSS MRFC MRFP I-CSCF SLF S-CSCF WCDMA Network GGSN P-CSCF CF CF PSTN CS Domain Home Network 17
18 Services on IMS Examples of Services that can be built on IMS Presence Instant Messaging Streaming 3GPP Standardizes IMS Service Capabilities NOT Services Services are implemented in Home Network Service knowledge not required in visited network Local Services still being worked on 3 Service Platforms CAMEL (IMS-SSF) SSF) OSA (OSA-SCS) SCS) SIP (SIP-AS) 18
19 To find out more Specifications (23.218, , , etc.) technical reports (23.815, , etc.) mailing lists meeting reports contributions IETF dependencies Internet drafts (MMUSIC, SIP, ROHC, AAA, IPV6, RAP, etc.) 19
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