西门子通讯3GPPIP多媒体子系统标准化介绍

1、3GPP IP多媒体子系统 (IMS)标准化介绍无线通信技术委员会第一次全会WG2#1会议北京2003.8.27-29来源：冯 勤西门子公司 内容内容nIMS概述概述n3GPP组织结构组织结构nIMS Release 5规范规范nIMS Release 6研究研究n总结总结I M S2, 12/10/2021 3GPP Release 99 网络结构网络结构PSTN/ISDNRadio Access NetworkInterworkedNetworkGSM Base Station SystemBTSBSCPSTN/ISDNCircuit Switched (CS) domainotherPL

2、MNASCPHLRCAPCore NetworkGbGPRS backboneIP transportPacket Switched (PS) domainGGSNGnInternetIntranetMSC-VLRSGSNG-MSCMAPMAPMAPCAPSMS SCGpGiUMTS Terrestrial Radio Access NetworkNodeBRNCIu PSIu CS3, 12/10/2021 3GPP Release 4 电路交换域中实现呼叫控制与电路交换域中实现呼叫控制与传输的分离传输的分离IP or ATMtransportAccess NetworkInterworke

3、dNetworkPSTN/ISDNCircuit Switched (CS) domainotherPLMNSCPHLRCore NetworkMSCserverNodeBRNCUTRANIu CSG-MSCserverBICCMAPCAPMGWCS-MGWH.248 / MEGACO basedH.248 / MEGACO basedGSM Base Station SystemBTSBSCA4, 12/10/2021 3GPP Release 5 分组交换域结构分组交换域结构InternetAccess NetworkInterworkedNetworkGSM BSSBTSBSCPSTN/

4、ISDNGb/Iu PSservices &applicationsHLRCore NetworkCSCFNodeBRNCUTRANIu PSMGCFMAPHSSMGWSIPH.248IP transportPacket Switched (PS) domainGGSN3G-SGSNGiSIPIP access with mobilityservices &applicationsCircuit Switched (CS) domain5, 12/10/2021 3GPP Release 5 分组交换域结构（分层）分组交换域结构（分层）Legacy PLMNSignalingN

5、etworksUTRANIN/CAMEL, OSA/Parlay, SIP applications3G-GGSN3G-SGSNMGCFCSCFMGWExternal IPNetworksIP Multimedia SubsystemDatabasesHSSPacket Switched DomainPOTS/ISDNTDMIPWeb / EmailWeb serverApplication PlatformMultimedia phoneSIP Communication (IMS)Internet Access without IMS6, 12/10/2021 IP多媒体子系统（多媒体子系

6、统（IMS）The IP Multimedia Subsystem (IMS)n provides a standardised multimedia solution for 3G networks on top of the IP bearer provided by GPRSn includes functionality for security, charging, roaming, and Quality of Service n is regarded as the generic service enabler for future IP multimedia applicat

7、ions in 3GPP networks Examples: Presence and Messaging Services will be standardised via IMSn is based on IETF Protocols SIP and SIP extensions Diameter, COPS, 7, 12/10/2021 IMS: Key Principlesn SIP as the single Call Control“ Protocol for IP Multimedia Servicesn Use IPv6 all IMS Network Entities in

8、cluding the mobile terminal use IPv6n Home Control the home network controls the services for a roaming usern Access Independence the IMS is designed independent of the underlying IP connectivity network specifications re-used by 3GPP2 for CDMA2000 systems access via WLAN will be definedn Allow Bind

9、ing between SIP Dialogue and the GPRS Media Session via Go interface in particular for QoS and Charging8, 12/10/2021 IMS in 3GPP Release 5 网络实体和协议网络实体和协议CS Domain-or-PSTN-or-Legacy-or-ExternalApplicationsand ServicesSCPASMultimediaIPNetworksSIPTCPUDPHTTPOthersSIPOperator 1MRF-CMGCFCxScGrMmMnGcMgBGCF

10、MiGoGmSLFMRF-PMpISCSIPDiameterH248SIPH248COPSSIPDiameterMAPSIPMjISUPSGWMrCSCFMwBGCFMkOperator 2SIPDxSIPShMAPMGWSGWSIPSIPCAPOSASiIM-SSFOSA-SCSDiameterCAPCSCFPDFHSSHLRPS DomainGGSNSGSNGnAlternativeAccess NetworksTCP/IP/UDP/RTP/UEUTRANMTTEUuIuRGERAN9, 12/10/2021 IMS 网络实体网络实体n CSCF (Call Session Control

11、 Function)n HSS (Home Subscriber Server)n PDF (Policy Decision Function)n SLF (Subscription Locator Function)n MRF (Multimedia Resource Function)n BGCF (Breakout Gateway Control Function)n MGCF (Media Gateway Control Function)n MGW (Media Gateway)n SGW (Signalling Gateway)n AS (Application Server)n

12、IM-SSF (IP Multimedia Service Switching Function)n OSA-SCS (Service Capability Server)Additionally:- QoS Entities- Charging Entities- Security Entities- Presence Service Entities- Location Service Entities- Push Service Entities- OAM and NM Entities- Firewalls, NAT, IPv4/v6, - DNS, DHCP, 10, 12/10/2

13、021 P-CSCF (Proxy CSCF)First contact point of an operators network (within IMS CN subsystem)n Forwarding of SIP messages between UE and CNn Generation of charging recordsn Translation of IDs other than SIP URIs into SIP URIs(e.g. E.164 numbers)n Authorisation of bearer resources and QoS management11

14、, 12/10/2021 I-CSCF (Interrogating CSCF)First contact point of an operators network (for other operators)n Forwarding of SIP messages (proxy functionality)n Assignment of a S-CSCF n Generation of charging recordsn Hiding of internal network configuration/capacity/topology12, 12/10/2021 S-CSCF (Servi

15、ng CSCF)Performs session control and service triggeringn Acts as a registrar n May behave as a Proxy Server, i.e. it accepts requests and services or forwards them on.n May behave as a User Agent, i.e. it may terminate and independently generate SIP transactions.n Interaction with service platform(s

16、)n Generation of charging recordsn Authentication13, 12/10/2021 HSSDatabase for subscriber related informationn User Profile n User Identification, Numbering and addressing information (SIP, Mail, E.164, Labels, IMSI, .)n User authentication support n Call control supportn Access authentication supp

17、ortn Service authorization supportn Service provisioning support14, 12/10/2021 BGCF (Breakout Gateway Control Function)n Selects the network in which PSTN breakout is to occur Forwards the session to a MGCF (selected by the BGCF) in the same network Forwards the session to an other BGCF (or MGCF) in

18、 a foreign networkn Receives request from S-CSCF to select appropriate PSTN break out point for the sessionn Generation of charging records15, 12/10/2021 MRFThe MRF is split into Multimedia Resource Function Controller (MRFC) and Multimedia Resource Function Processor(MRFP). It is mainly for confere

19、ncing and announcements. n MRFC- Control the media stream resources in the MRFP n MRFP- Provide resources to be controlled by the MRFC and Media stream processing (e.g. audio transcoding, media analysis) 16, 12/10/2021 GqApplication & Services Legacy Signalling Networks Access Network GGSN MRFC

20、PSTN CSCF SLF CSCF BGCF BGCF MGCF T-SGW Cx Dx Mb Sh ISC Gi Mw Mn Mr Mj Mi Mk MGW Mb HSS R-SGW Mh Mg Go Multimedia IP Networks Mm MRFP Mp Sr PDF Mb Gm Mb IMS in 3GPP Release 6 architectureUt17, 12/10/2021 IMS: 注册和会话建立注册和会话建立Home Network of UE ANetwork visited by UE AHome Network of UE BNetwork visite

21、d by UE BUE AUE BP-CSCF-AP-CSCF-B14S-CSCF-AS-CSCF-BI-CSCF-BI-CSCF-AHSS-BHSS-AUser Profile3756Call Control / Dialog2INVITEREGISTERMedia SessionCSCF = Call Session Control Function(I = Interrogating,P= Proxy,S = Serving)HSS = Home Subscriber ServerUE = User Equipment18, 12/10/2021 IMS服务质量（服务质量（QoS）COP

22、SPolicy Decision FunctionGGSNGo InterfaceCommon Open Policy Service (COPS): IP protocol used for transport of policy informationThe PDF gets the negotiated SDP parameters from thepeer-side through SIP signalling interaction. The PDFidentifies the connection information neededThe PDF defines the QoS

23、resource authorisationAn authorization token is generated by the PDF andsent to the UEMedia Authorisation request from GGSN and decision from PDFCharging correlation 19, 12/10/2021 内容内容nIMS概述概述n3GPP组织结构组织结构nIMS Release 5规范规范nIMS Release 6研究研究n总结总结I M S20, 12/10/2021 3GPP 组织结构以及与组织结构以及与IMS相关的工作组相关的工作

24、组IMS Stage 1IMS Arch.(Stage 2)IMS SecurityISIMIMS ChargingStage 3 (Protocols):SIPCAMEL InterworkingCOPS, InterworkingDIAMETEROSA Interworking21, 12/10/2021 内容内容nIMS概述概述n3GPP组织结构组织结构nIMS Release 5规范规范nIMS Release 6研究研究n总结总结I M S22, 12/10/2021 IMS Release 5规范规范n IMS Stage 13GPP TS 22.228: IP multimedi

25、a subsystem; Stage 1 n IMS Stage-2/33GPP TS 23.228: IP Multimedia Subsystem (IMS); Stage 2 3GPP TS 24.229: IP Multimedia Call Control Protocol based on SIP and SDP; Stage 3 3GPP TS 29.228: IP Multimedia (IM) Subsystem Cx Interface; Signalling flows and message contents 3GPP TS 29.229: Cx Interface b

26、ased on the Diameter protocol; Protocol detailsOthers are TS 23.218, 29.229, 29.328, 29.32923, 12/10/2021 IMS Release 5规范（续）规范（续）n 3GPP requirements and architecture 3GPP TS 23.002, 23.003, 23.008, 23.221, 27.060n 3GPP QoS management and Service Based Local Policy for IMS 3GPP TS 23.207, 29.207, 29.

27、208n 3GPP Charging and Billing for IMS 3GPP TS 32.200, 32.225n 3GPP Security for IMS 3GPP TS 33.203, 33.210n Signalling Flows for IMS 3GPP TS 24.228: Signalling flows for the IP multimedia call control based on SIP and SDP; Stage 3 n CAMEL Support for IMS 3GPP TS 23.278, 29.278 24, 12/10/2021 Releas

28、e 5 IMS规范状态规范状态n All specifications “frozen” as of September 2002n Support for basic IMS operation Support for various SIP methods including REGISTER, INVITE, UPDATE, SUBSCRIBE/NOTIFY, etc. Support for fundamental capabilities including Authentication/Authorization, MO/MT sessions, Service Based Loc

29、al Policy, Charging, Security, etc. Not complete in areas of Interworking with PSTN/Internet, MGW/MRFP control and some others.n Level of Change Requests Low for most as of January 2003 Moderate activity in IMS Charging Stage-3 in March 2003 Still expect high activity in IMS SIP Stage-3 till June 20

30、0325, 12/10/2021 内容内容nIMS概述概述n3GPP组织结构组织结构nIMS Release 5规范规范nIMS Release 6研究研究n总结总结I M S26, 12/10/2021 IMS Release 6研究研究n Interoperability and Commonality support for use of the IMS core by other access technologiesn IMS Local Services support for access to services in visited networkn IMS to PS Int

31、erworking support for interworking with IP endpoints including IPv4/IPv6 interworkingn IMS to CS Interworking support for SIP/ISUP interworking and CS roaming scenariosn IMS Conferencing support for IMS based conference provision and control 27, 12/10/2021 IMS Release 6研究（续）研究（续）n SIP Capabilities E

32、nhancements support for enhanced SIP capabilities such as forkingn QoS and Service Based Local Policy Enhancements support for Gq interface and non-IMS applications n WLAN Interworking support for WLAN n Presence Capability support for presence n Generic User Profile support for user data management28, 12/10/2021 IMS Release 6研究状态研究状态n Stage-1 CRs mostly complete (SA1) Initial work on IMS Subscriptions and Access Scenariosn Stage-2 Documents or CRs in progress (SA2) Interoperability & commonality 23.228 re-org agreed, additional work on TR in progress (June) So