IP Multimedia Subsystem (IMS)
Date : 3rd May, 2011
Name : Kim, Hyun-Tae
Lee, Jong-Hyun
SEAL
Sungkyunkwan Evolutionary Algorithm Lab
CONTENTS
1. Introduction
2. Architecture
3. Key Features
4. Conclusion
Introduction
The internet
‣ Over 1.9 billion Internet Users.
You are here.
1st generation of the Internet
‣ 28.7% of the world population.
‣ transport of non real time data
‣ services with stringent QoS
Next generation of the Internet
‣ access to personalized interactive
‣ on any device, and anywhere
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IP Multimedia Subsystem (IMS)
The IMS is
‣ a network functional architecture.
‣ to provide a multimedia service delivery upon Internet protocols.
interoperability
&
network convergence
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Architecture
Three-layered architecture
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Transport Layer
This layer is
‣ comprised routers and switches.
‣ responsible for the abstraction of the actual access networks.
‣ a interaction point between the access layers and the IP network.
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Control Layer
This layer is
‣ consisted mainly of control platforms for
managing call, session set-up, modification and release.
‣ to provide capability to interface the service layer with other services.
such as provisioning, charging and operation & management.
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Control Layer cont.
The main component of this layer is
‣ the Call Session Control Function (CSCF)
which facilities the correct interaction
between application servers, media server and HSS.
I(Interrogating)-CSCF
‣ The domain’s contact point for inter-domain SIP signaling.
S(Serving)-CSCF
‣ Control the user’s SIP session.
P(Proxy)-CSCF
‣ The IMS contact point for SIP signaling.
‣ To secure, compress and decompress, ensure the correctness of SIP message
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Control Layer cont.
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Service(application) Layer
This layer is
‣ where all of the actual services (service platforms, servers) live.
‣ to provide
such as presence, voice over IP, group list management
(as SIP application servers)
‣ to give its architecture
the power and flexibility to rapidly deploy new service.
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Key features
Key features of IMS
We will discuss about
‣ Vertical vs. Horizontal Integration Services.
‣ Service enablers
Presence, Group List Management
‣ Service Inter-Operator Relation (Interoperability)
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Vertical vs. Horizontal Integration Services
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Vertical vs. Horizontal Integration Services cont.
The vertical integration services is
‣ each service has its unique functionality.
‣ no reuse of service components.
‣ very costly, complex, and difficult to build and maintain.
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Service enabler
The IMS facilitates
‣ creation and delivery of multimedia services
based on common enablers in a ‘write once, use many’ way.
= Service enabler
The service enabler
‣ represents generic & reusable building blocks for service creation.
‣ developed for successful applications
can become ‘global enablers’
which are automatically included in new apps and service.
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Service enabler - Presence
The presence enabler is
‣ to allow a set of users to be informed about
the availability and means of communication of other users
‣ enables a paradigm shift in P2P and other communication.
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Service enabler – Group List Management
The group list management enabler is
‣ to allow a set of users to create and manage
network-based group definitions for use.
The application examples for group management include:
buddy list
block list
private / public
group
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Service inter-Operator Relation
The IMS is
‣ to be able the reuse of inter-operator relations.
‣ to establish and build upon for each service.
Non-IMS interconnect relations
IMS enables operator relations
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Benefits of IMS
For operators
‣ They can provide the basis of a horizontal architecture.
‣ Also, they can reuse of service enablers and common functions
for offering multiple applications.
For users
‣ They can use variety services:
P2C(person-to-content), P2P(person-to-person) communication
for voice, text, image and video content and their hybrid.
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Conclusion
Conclusion
The IP Multimedia Subsystem(IMS) is a generic standard architecture
for offering IP multimedia services and also VoIP.
The power of IMS comes from
‣ open network interfaces and platforms.
‣ horizontal architecture.
= transport and control layers effectively disassociate the services
‣ generic and reusable.
= service enablers (e.g., presence, group list management)
As IMS-based SP networks continue to be designed and deployed,
it will completely revolutionize the way we interact with our digital world.
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Question ?
Thank You
for your attention !!