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IMS: Lessons Learned
Brough TurnerSVP & CTO
Slide 2
Tomorrow’s Communications Network
One core network with “any access”Based on IPWireline and wireless transparencyStandardized signaling based on extensions to IETF stds
Access and bandwidth will become commodities, services are the differentiatorIP Multimedia Subsystem (IMS)
Per-session control to support per-application quality of service (QoS) guarantees and per-application billingBut service creation environments not standardized
Slide 3
IMS Story – Convergence
Traditional Services IMS Services
Source: Team Analysis, Lucent
TV Caller ID Phone Tools Push to Talk
WirelinePacket Cable
Wireless WifiWiMax
OS
S/
BS
S
AccessDelivery
MediaFunctions
Subscriber Data
Application
Subscriber Data
Media Functions
IP Multimedia SubsystemIP Multimedia Subsystem
OS
S/
BS
S
ApplicationApplication Application
OS
S/
BS
S
AccessDelivery
MediaFunctions
Subscriber Data
Application
OS
S/
BS
SAccessDelivery
MediaFunctions
Subscriber Data
Application
TV Caller ID Phone Tools Push to Talk
WirelinePacket Cable
Wireless WifiWiMax
Slide 4
IMS Business Justification
Convergence (to IP) saves moneyAccess to new (IP-based) applications provides new sources of revenuePer session control (of IP sessions) allows differential billing on a per-application basis
But …Must maintain current revenue streams
Controlled migration, especially for profitable applications
Slide 5
History of IMS and NGN
3GPP R4 — Softswitching for circuit switched 3GSM networks3GPP R5 — SIP-based IP Multimedia Subsystem (IMS) introduced3GPP R6 — adds features and support for IMS over WLAN3GPP R7 — adds broadband / wireline access capabilities with participation from 3GPP2 (CDMA 2000), TISPAN (ETSI’s NGN), ITU-T NGN Focus Grp, ATIS NGN Focus Grp, PacketCable
2000 2001 2002 2003 2004 2005 2006
3GPP Release 43GPP IMS R5
3GPP IMS R6
TISPAN R13GPP2 MMD
ITU-T NGN FGATIS NGN FG
Packet Cable 2.03GPP IMS R7
Slide 6
3GPP R7/TISPAN IMS Architecture
Slide 7
IMS Session (i.e. Call) Control
CSCF = Call session control function, i.e. softswitch
Slide 8
So Far, Only Used for New Applications !
Most major mobile operators have deployed a SIP infrastructure of some sort
CSCFs per strict IMS, or pre-IMS softswitchesIn use for new applications like Push-to-talk (PTT)
Fixed operators moving to softswitching for conventional voice,
But …Mobile voice calls still use circuit switching
Slide 9
Long Term Parallels: IN & IMS
Intelligent Network (IN) –– IP Multimedia System (IMS)
Free operators from equipment provider lock-inSeparate applications from basic call controlOpen protocols & APIs for (many) new applications
Intelligent Network Application Successes800/900 #s, Mobile (HLR), Pre-paid, Voice mail, …15 year summary:
only a few applications, but very widely deployed
Slide 10
Early IMS Applications
Push-to-TalkBeing deployed today, performance improving
Add video during voice call, a.k.a. video sharing“See what I see” most common use of 3G video callingVideo sharing awaits spread of appropriate handsets
Fixed-mobile convergence (FMC)But initial deployments use circuit switching via UMA
Instant messagingMobile initiated communities? or AOL, Yahoo, MSN & QQ?
Video ringback – NMS 2008 ?
Slide 11
IMS Application & Database Servers
Primary Application Servers (AS) part of IMS network package
Ericsson – BEA WebLogic SIP Server (WLSS)Nokia-Siemens – Ubiquity SIP Application Server (SIP A/S)Standard interfaces; vendor specific added capabilities
Primary database is Home Subscriber Server (HSS)Extensible to support application data – in theoryStandard interfaces; vendor specific added capabilities
Slide 12
Media in IMS Applications
In IMS model, applications invoke shared, network-based, Media Resource Function (MRF)
Slide 13
Practical DeploymentsLikely to be different
Generic MRF is announcement server; additional media capabilities available, but expensiveMedia resources scale with application, i.e. must deploy additional ports with each applicationSome applications require specialized media, e.g. video, wideband audio conferencing
Rich media resources from application vendorApplication vendor follows IMS specs – offers to use existing MRF, but ends up selling application-specific MRF
Slide 14
IMS Model MRF vs. Actual MRFs
MRFP
IMS Core Network
MGW
S-CSCF
AS
MRFC
NetworkAnnouncement
Server
Media for a specific application
Slide 15
Application Migration Example
MyCaller – Leading ringback tone solutionDeployed in ~30 mobile operator networksExisting deployments via IN and other circuit techniques
Migration stage one: IMS-enabled MyCallerWorks with IMS and “pre-IMS” SIP infrastructuresConsistent with a variety of “IMS” configurations
Migration stage two: Native IMS MyCallerLeverage standard IMS network elements to maximum possible extent
Slide 16
MyCaller Service Architecture – IN
Service GW
MSC
HLR
SCP
Wireless Network
Wireless Network
CSM
Content
Customer Care
OSS / BSS
Subscriber Info
SubscriberAccess
Management
Media
Digital Asset
Management
Profile Info
SubscriberProfiling & Statistics
Subscriber Provisioning,Content Selection
Web
IVR
WAP
SMS
MyCallerMobile Media Platform
Audio IDQuery
MyCaller Subscriber
Server
Audio
MyCallerMMP Node
Slide 17
IMS-enabled MyCaller – Component View
S-CSCFFilter
Cx (D
iam
eter
)
ISC(SIP)
RTP
Network ASRBT Logic
Subscriber Access(Web, WAP, IVR,
SMS, MMS, J2ME)
Subscriber Profiling
• Data Mining• Trend AnalysisCSM
Subscriber Info
SubscriberAccess
Management
Media
Digital Asset
Management
Profile Info
SubscriberProfiling & Statistics
Content
Customer Care
OSS / BSSHSS
MyCaller (MRF & AS)
RBT Logic
Service GWProprietary IP Mechanism
Proprietary IP Mechanism
Mr (SIP)
Slide 18
IMS-enabled MyCaller – Components
Network Application Server (e.g. BEA WLSS) B2BUA; Resilience and Redundancy
RBT AS logicPartial RBT Logic – connection routing (select MRF)
MyCaller Intelligent Peripheral (MRF & AS)Partial RBT Logic – subscriber preferences & music databaseSIP UA Server functionality; RTP Interface
MyCaller CSMProvides XML/SOAP interface for HSS Provisioning and Billing through custom adapter
Slide 19
IMS Native MyCaller
ASRBT Logic
S-CSCFFilter
Cx (D
iam
eter
)
ISC(SIP)
MRFC
Sh
MRFPRTP
Service GW
Non-IMS IP Mechanism
Non-IMS IP MechanismNon-IMS IP Mechanism
Mr (SIP)
HSS
(BEA WLSSor equiv.)
CSM
Content
Customer Care
OSS / BSS
Subscriber Info
SubscriberAccess
Management
Media
Digital Asset
Management
Profile Info
SubscriberProfiling & Statistics
Subscriber Provisioning,Content Selection
Web
IVR
WAP
SMS
Slide 20
IMS Native MyCaller – Components
MyCaller CSMProvides XML/SOAP interface for HSS Provisioning and Billing through custom adapter
Application ServerMyCaller Subscriber Server functionsForward INVITE to MRFC with selected content file to play
MRFC – Media Resource Broker for ASIdentifies which set of MRFPs have the needed content
MRFPMedia Player with appropriate content replica to meet < 50 ms incremental post dial delay timing
Slide 21
IMS Application Summary
Application logicConnection control via IMS application server (AS) IMS AS determined by network providerAugment with application-specific AS for complex and/or media rich applications
Data storageHSS for subscriber data and session dataTypically augmented with application-specific databases
Media Leverage network MRF for simple announcementsProvide application-specific MRFs for significant media
Slide 22
IMS: Lessons Learned (so far)
Early days, evolving specs“Pre-IMS” deployments, esp. on fixed networks3GPP releases 6, 7 yet to come, i.e. many years of evolution
Connection control focusEstablish IP sessions, guarantee QoS, bill per session
Many applications need additional IT infrastructureRich media – specialized databasesInteractive dialogs (IVVR) – additional AS & MRF functionality, e.g. VXML, speech, content cachingOnce connected, three-tier IT model still valid, i.e. 1) database, 2) business logic, 3) presentation
Slide 23
IMS Status
Questioning is over70% of the service providers believe that IMS is important or essential to their business
Trials underway35 major operators with IMS trials underwaySome partial deployments in commercial service
Building on experienceOperators talking about early IMS experienceAreas of further work have been identified