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8/6/2019 IP Multimedia Subsystem-RKaczmarek
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LEF BRIEFING SERIES
CSC GRANTS
IP Multimedia Subsystem (IMS):The Long and Winding Road
Richard Kaczmarek
September 11, 2008
1 2008 CSC
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Outline
The business case for IMS
3GPP network architecture
IMS architecture
IMS variations
IMS de lo ments
LEF Briefing Series CSC Grants 2
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What is IMS?
Developed by the Third Generation Partnership Project(3GPP), an international Standards Development Organization(SDO) associated with the Global System for MobileCommunications (GSM) service provider community
Developed on the principles of:
Consistent look and feel to user independent of location ayere arc ec ure app ca on p ane, con ro p ane an ranspor
plane)
Functional decomposition of each layer into entities
Standardized interfaces between entities (both horizontal and
vert ca
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The Business Case for IMS
Investment (ROI) byProviding enhanced services to increase revenue and
customer lo alt
Providing a faster time to market due to a layered softwarearchitecture and standardized interfaces
Reducing capital expenditures (capex) after IMS
Reducing operational expenditures (opex) after IMSimplementation due to simplified operations on a singleinfrastructure
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The Business Case for IMS
Potential Impediments to IMS
Cost of IMS deployments
Lack of a killer application
IMS variations
LEF Briefing Series CSC Grants 5
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3GPP Network Architecture
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IMS Architecture
AS
Application ServiceLayer
Le end
Basic Service Functionality
Interdomain Functionality
Miscellaneous Functionality
egen
I-CSCF S-CSCF
SLF
HSS
w
Mw
Dx Dx
Cx
Control Layer Signaling and Control
Interface
Bearer Interface
P-CSCF
MGCFMRFC BGCF
Mw
MgM
r
MjIBCF
MxMx
Mx
MxE-CSCF
LRF
Mw
MI
Mn
MGW
SGW
MRFP
Mn
MbTransportLayer TrGWPCRF
PCEF
IP NetworkIP NetworkANIP Network
SEG
IP Network PSTN
SEG
LEF Briefing Series CSC Grants 7
CSCF BGCF User Equipmentand Other IMS
NetworksUE
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IMS Architecture Basic Components
AS
Application ServiceLayer
Le end
Basic Service Functionality
Interdomain Functionality
Miscellaneous Functionality
Legend
Application Server
Serving Call SessionControl Function
I-CSCF S-CSCF
SLF
HSS
w
Mw
Dx Dx
Cx
Control Layer Signaling and Control
Interface
Bearer Interface
Provides enhancedservices to user
available to user
Controls resources in itsdomain
P-CSCF
MGCFMRFC BGCF
Mw
MgM
r
MjIBCF
MxMx
Mx
MxE-CSCF
LRF
Mw
MI
Mn Contains service and user
information
MGW
SGW
MRFP
Mn
MbTransportLayer TrGWPCRF
PCEF
Proxy Call SessionControl Function
IP NetworkIP NetworkANIP Network
SEG
IP Network PSTN
SEG UE access into IMS Routes signaling to usershome S-CSCF
LEF Briefing Series CSC Grants 8
CSCF BGCF User Equipmentand Other IMS
NetworksUE
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Legend
IMS Architecture Interdomain Components
AS
Application ServiceLayer
Signaling and Legend
Basic Service Functionality
Interdomain Functionality
Miscellaneous Functionality
Multimedia ResourceFunction Processor
I-CSCF S-CSCF
SLF
HSS
MwMw
Mw
Dx Dx
Cx
Control Layer Signaling and ControlInterface
Bearer Interface
MnMn
Mixes incoming media
streams Transcoding,
announcements Managing access rights
P-CSCF
MGCFMRFC BGCF
MgM
r
Mj
IBCF
MxMx
Mx
MxE-CSCF
LRF
Mw
MI
Media Gateway Packet conversion
to circuit for bearer
packets
to shared conferencingresources
MGW
SGW
MRFP
Mn
MbTransportLayer TrGWPCRF
PCEF
Transition Gateway IPv4 to IPv6 packet
conversion for
IP NetworkIP NetworkANIP Network
SEG
IP Network PSTN
SEGSecurity Gateway Enforces security policy
with other domains
bearer packets
LEF Briefing Series CSC Grants 9
CSCF BGCF User Equipmentand Other IMSNetworks
UE
Signaling Gateway SIP signaling to
SS7 signaling
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IMS Architecture Interdomain Components
AS
Application ServiceLayer
Le end
Basic Service Functionality
Interdomain Functionality
Miscellaneous Functionality
Legend
Interrogating CSCF Used by P-CSCFs to
determine users S-CSCF
Subscription LocatorFunction Used by I-CSCF to
determine HSS associated
I-CSCF S-CSCF
SLF
HSS
w
Mw
Dx Dx
Cx
Control Layer Signaling and Control
Interface
Bearer Interface
Access point for session
requests from otherdomains P-CSCFs
Interconnection BorderControl Function Interworking between SIP
P-CSCF
MGCFMRFC BGCF
Mw
MgM
r
MjIBCF
MxMx
Mx
MxE-CSCF
LRF
Mw
MI
Mn and other protocols (e.g.,H.323)
Can be used in place of I-CSCF
Multimedia ResourceFunction Controller Controls the MRFP
MGW
SGW
MRFP
Mn
MbTransportLayer TrGWPCRF
PCEF
Breakout GatewayControl Function Determines network on
which PSTN
Media Gateway ControlFunction
IP NetworkIP NetworkANIP Network
SEG
IP Network PSTN
SEG
interworking is to occur on ro s n eropera on o
bearer channels betweenthe PSTN and the IMScore network
LEF Briefing Series CSC Grants 10
CSCF BGCF User Equipmentand Other IMS
NetworksUE
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IMS Architecture Miscellaneous Components
AS
Application ServiceLayer
Le end
Basic Service Functionality
Interdomain Functionality
Miscellaneous Functionality
Legend
I-CSCF S-CSCF
SLF
HSS
w
Mw
Dx Dx
Cx
Control Layer Signaling and Control
Interface
Bearer InterfaceEmergency (911) CSCF Routes call to emergency
provider as opposed tousers home network Policy and Charging
P-CSCF
MGCFMRFC BGCF
Mw
MgM
r
MjIBCF
MxMx
Mx
MxE-CSCF
LRF
Mw
MI
Mn Rules Function Selects applicable
rules for session
MGW
SGW
MRFP
Mn
MbTransportLayer TrGWPCRF
PCEF
IP NetworkIP NetworkANIP Network
SEG
IP Network PSTN
SEG
Function Identifies location of user
Policy and ChargingEnforcement Function Enforces applicable
rules for session
LEF Briefing Series CSC Grants 11
CSCF BGCF User Equipmentand Other IMS
NetworksUE
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IMS Variations
development Some 3GPP assumptions do not carry over to other SDO
LEF Briefing Series CSC Grants 12
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IMS Variations
ance or e ecommun ca ons n us ry o u ons
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IMS Variations
ance or e ecommun ca ons n us ry o u ons
Grouping of IMSentities into higherlevel components
Use of Service Broker toallow inter-a licationserver communications
More security functions,since networks do nothave same level of
LEF Briefing Series CSC Grants 14
networks
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IMS Variations
European Telecommunications Standards Institute (ETSI)
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IMS Variations
European Telecommunications Standards Institute (ETSI)
Added a PSTN/ISDNEmulation Subsystemto the signaling layer
Added Resource andAdmission ControlSubs stem to
Added Network AttachmentSubsystem to transport layer
LEF Briefing Series CSC Grants 16
transport layer
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IMS Variations
vances o u me a u sys em -
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IMS Variations
vances o u me a u sys em -
Service Broker manages
Both SIP and non-SIPbased applications
feature invocations andinteractions across
sessions
Application Manager SIPentity handling CSCF andPSTN routing
Services Data Manager HSS and AAA
Bearer Manager policyenforcement for QoS,security
functionality
Policy Manager unified
Security Manager detects anomalies
LEF Briefing Series CSC Grants 18
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IMS Variations
Common IMS
by all SDOs Defined as the Core IMS plus selected additional IMS-
LEF Briefing Series CSC Grants 19
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IMS Variations
Common IMS
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CSCs Role in IMS Standards Development
CSC supports the National Communications System (NCS)in defining National Security / Emergency Preparedness(NS/EP) requirements and functions for the IMSarc ec ure an n a vanc ng ese requ remen s an
functions in the following standards organizations:Alliance for Telecommunications Industry Solutions (ATIS)
n erne ng neer ng as orce
Third Generation Partnership Project (3GPP)
MultiServices Forum (MSF)
CSC runs an eXperimental Testbed Environment (XTE) forthe NCS, which determines the feasibility / practicality ofvarious approaches to supporting NS/EP requirements
CSC uses Radvisions SIP Server Development Platform toprototype and demonstrate NS/EP functionality to industry
LEF Briefing Series CSC Grants 21
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IMS Deployments
IMS vendors
Some failures / consolidation has
Telecommunications Equipment Manufacturers
Softswitch, IM/Presence,
Media Server, SBCEnd-to-end IMS Solution PDF, HSS, AS, NASS,
MRFC/MRFP, CSCF
CSCF, MGCF, BGCF,
MGW, SGWEnd-to-end IMS Solution
occurre
IMS product interoperability testing
End-to-end IMS Solution
End-to-end IMS Solution
End-to-end IMS Solution
AS, CSCF, HSS, MGCF,
End-to-end IMS Solution
Information Technology Suppliers
Multiservices Forum (MSF) GlobalMSF Interoperability (GMI)exercises
The XTE will be a host site in
WebLogic SIP Server(Service Broker)
OpenCall (Media Server,
AS and Service Broker,HLR, HSS, Signaling
Gateway, Location Server)
Tivoli Netcool IMS Manager,
WebSphere IMS Connector (AS)
Networking, Communicationsand Applications Servers
Networking, Communications
and Application Processors
SDP Tools
October 2008
IMS Forum Plugfest
GSM Association SIP Trials
SBC
AS, Media ServerAS Media Gateway,Multiservices Platform (AS)
IMS Test Suite Softswitch and AS AS AS, Media Server
CSCF, SBCLocation Server, Security
Server, OpenWeb (AS)
Resource Controller (QoS) Media Server
LEF Briefing Series CSC Grants 22
AS, CSCF, SMSIMS Test Suite
CSCF
eo a orm an a eway,IMS Software Development
Tools, IMS Test Suite
AS
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IMS Deployments
Carrier Field Trials
Underway, but results are carrier-proprietary
-
First full IMS solutions anticipated to occur from 2009 2011. Reasonscited:
Need for the IMS s ecifications to be finalized and stable
Availability of complete IMS systems at reasonable price points
Availability of IMS revenue-generating data services
Ability to provide IMS-like services through more cost-effective non-IMScomponen s
Justifying IMS capex when existing networks have not yet been sufficientlyamortized
Determining how to operate hybrid IMS/non-IMS networks for maximum ROI
Identifying killer applications An additional 10+ years will be needed to fully convert to IMS-only
networks
LEF Briefing Series CSC Grants 23
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Summary
IMS is an evolving set of standards that defines anenhanced services architecture for telecommunications
ere are erent var at ons o
IMS Products existField trials are occurring
Hybrid IMS / non-IMS networks exist
Migration to IMS-only networks depends on the businesscase / ROI for IMS and may take years
Development Platforms
Will work in existing hybrid networks and future IMS networks
Have an IMS issue? Contact CSC
LEF Briefing Series CSC Grants 25