IP Multimedia Subsystem (IMS)

IP Multimedia Subsystem (IMS)

Date : 3rd May, 2011Name : Kim, Hyun-Tae Lee, Jong-Hyun

SEALSungkyunkwan Evolutionary Algorithm Lab

CONTENTS

1. Introduction

2. Architecture

3. Key Features

4. Conclusion

Introduction

The internet

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You are here.

‣ Over 1.9 billion Internet Users.

‣ 28.7% of the world population.1st generation of the Internet‣ transport of non real time

data‣ services with stringent

QoS

Next generation of the Internet‣ access to personalized

interactive‣ on any device, and anywhere


IP Multimedia Subsystem (IMS)

‣ a network functional architecture.‣ to provide a multimedia service delivery upon Internet protocols.

The IMS is

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interoperability

&network convergence


Architecture

Three-layered architecture

7SEALSungkyunkwan Evolutionary Algorithm Lab

Transport Layer

This layer is

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‣ responsible for the abstraction of the actual access networks.‣ a interaction point between the access layers and the IP network.

‣ comprised routers and switches.


Control Layer

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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.


Control Layer cont.

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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.

P(Proxy)-CSCF

S(Serving)-CSCF

I(Interrogating)-CSCF

‣ The IMS contact point for SIP signaling.‣ To secure, compress and decompress, ensure the correctness of SIP

message

‣ Control the user’s SIP session.

‣ The domain’s contact point for inter-domain SIP signaling.


Control Layer cont.

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Sungkyunkwan Evolutionary Algorithm Lab

Service(application) Layer

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This layer is

‣ to providesuch 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.

‣ where all of the actual services (service platforms, servers) live.

Key features

Key features of IMS

We will discuss about

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‣ Service enablers Presence, Group List Management

‣ Service Inter-Operator Relation (Interoperability)

‣ Vertical vs. Horizontal Integration Services.


Vertical vs. Horizontal Integration Services


Vertical vs. Horizontal Integration Services cont. The vertical integration services is

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‣ no reuse of service components.

‣ very costly, complex, and difficult to build and maintain.

‣ each service has its unique functionality.


Service enabler

The IMS facilitates


‣ creation and delivery of multimedia services based on common enablers in a ‘write once, use

many’ way.

The service enabler

= 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.

Service enabler - Presence

The presence enabler is

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‣ enables a paradigm shift in P2P and other communication.

‣ to allow a set of users to be informed aboutthe availability and means of communication of

other users


Service enabler – Group List ManagementThe group list management enabler is

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‣ to allow a set of users to create and managenetwork-based group definitions for use.


The application examples for group management include:

buddy list block list

private / publicgroup


Service inter-Operator Relation

Non-IMS interconnect relations IMS enables operator relations

The IMS is

‣ to establish and build upon for each service.

‣ to be able the reuse of inter-operator relations.

Benefits of IMS

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For users

For operators

‣ They can use variety services:P2C(person-to-content), P2P(person-to-person)

communication for voice, text, image and video content and their hybrid.

‣ Also, they can reuse of service enablers and common functions

for offering multiple applications.


‣ They can provide the basis of a horizontal architecture.

Conclusion

Conclusion

The power of IMS comes from

As IMS-based SP networks continue to be designed and deployed, it will completely revolutionize the way we interact with our digital world.

The IP Multimedia Subsystem(IMS) is a generic standard architecture

for offering IP multimedia services and also VoIP.

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‣ horizontal architecture. = transport and control layers effectively disassociate the services

‣ generic and reusable. = service enablers (e.g., presence, group list management)

‣ open network interfaces and platforms.

Question ?

Thank You for your attention !!

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IP Multimedia Subsystem (IMS)