IMS Overview.ppt

8/9/2019 IMS Overview.ppt

http://slidepdf.com/reader/full/ims-overviewppt 1/14

IMS Overview

Parichay BoseSolution Architect

SMS-SF, CSI-ADM, EGI



Contents

● What is IMS?

● Basic Principles

● IMS building blocks

● IMS Architecture

● Why all the ecite!ent?

● Who needs IMS

● Proble!s

● Conclusions



What is IMS?

● IMS is an architecture" it is not a protocol#

● Open$syste!s architecture that supports a range o% IP$

based services over both Private and Carrier networks"e!ploying both wireless and %ied access technologies#

● IMS is de%ined by &'PP#



Basic Principles

● Access Independence

● (i%%erent )etwork Architectures

● *er!inal and user !obility

● +tensive IP$based services



IMS Building Blocks

● An all$IP Core )etwork ,C)-

● An all$IP .adio Access network ,.A)-

● Multi!edia call control based on SIP

● /uality o% Service ,/oS- support %or IP



Manage!ent

Provisioning

Charging

)u!ber Mapping

MGW

SG/MGCF

CSCF

MRF

HSSSIP" IP

Control Layer

AS ASSIP 0 OSA 0 CAM+1

Application Layer

IP0MP1S PS*)0P1M)

'+.A)" 2*.A)" W1A)" (S1"###

Connectivity & Access Layer

IMS Architecture



6

HSS:

Home Subscriber ServerCSCF: Call Session ControlFunction:

S-CSCF: Serving CSCF

I-CSCF: Interrogating CSCF

P-CSCF: Proxy CSCF

BGCF: Breakout GatewayControl Function

MGCF: e!ia Gateway ControlFunction

AS: "##lication Server

SCP: Service Control Point

MGW: e!ia Gateway

MRFC: ultime!ia $esourceFunction Controller

MRFP: ultime!ia $esourceFunction Processor

Applications

and Services

AS

SCP

Mobile

UE

GERAN

UTRAN

SGSN

IM-SSF

OSA-SCS

CSCF

HSS

SGOperator !

CSCF "GCF

Operator #

"GCF

MGCF

MRFC MRFP

GGSN

M$lti%edia

IP

Net&or's

CS (o%ain

- or -

PSTN- or -

)e*ac+

- or -

E,ternal

MG

SG

Alternative

Access

Net&or'

IMS Architecture



3ertical vs# 4ori5ontal Architecture

*er!inal *er!inal)etwork

logic

S er vi c e

1

S er vi c e

2

S er vi c e

3

Replicated - not resa!le

Application lo"icCo##on $nctions

Rotin"

*er!inal *er!inal)etwork

logic

Replication o$ co##on $nctions

S er vi c e

1

S er vi c e

2

S er vi c e

3 Rotin"

Co##on $nctions



I!agine starting a voice call on you ho!e phone and trans%erring it

sea!lessly to your !obile as you drive to work#

I!agine sending a !ulti!edia !essage %ro! your car that later

appears on your *3 screen#

I!agine watching a !ovie on that sa!e *3" pausing it in !id$show

and then watching it on a wireless P(A as you rela in the garden#

I!agine having a cell phone conversation with two or three %riends

and si!ultaneously sharing a video o% the %ootball !atch you are

attending#

I!agine that all o% the above can be done with a single account"

on a single log$in with !ultiple devices over any nu!ber o% accessnetworks

*hese are only a %ew ea!ples o% sea!less !ulti!edia services

that IMS will allow users to access 6anywhere7 at 6anyti!e7

Why all o% the ecite!ent?



Who needs IMS?

Fi%ed et'or( )sers want

Multi!edia Con%erencing

3oice over IP

Strea!ing Services

Mo!ile et'or( )sers want

Push$to$8

1ocation Based Services

Mobile 'a!ing



Who needs IMS?

et'or( *roviders want

9ied Mobile Convergence

One service $ one i!ple!entation %or all

access types

)ew Business Models



Proble!s and open issues

Architecture co!pleity# 'uarantees o% /oS# I+*9 and &'PP standardisation co$operation# SIP and IMS architecture are not !ature enough

to guarantee %ully %unctioning network# *er!inal co!pleity#



Selected Acronyms

&' *hird 'eneration

&'PP,:- *hird 'eneration PartnershipPro;ect ,:-

API Application Progra!!ing Inter%ace

AS Application Server

B'C9 Breakout 'ateway Control9unction

CAM+1 Custo!ised Applications %or

Mobile +nhanced 1ogic

CSC9 Call Session Control 9unction

BIC) Bearer Independent Core )etwork

''S) 'ateway 'P.S Support )ode

'P.S 'eneral Packet .adio Service

'SM 'lobal Syste! %or Mobility

IMS IP Multi!edia Subsyste!IP Internet Protocol

IP$CA) IP$ Connectivity Access )etwork

ISIM IMS Subscriber Identity Module

IW9 Inter$Working 9unction

1A) 1ocal Area )etwork

/oS /uality o% Service

.ACS .esource and Ad!ission ControlSubsyste!

.A) .adio Access )etwork

SCM Session Control Manager

S'S) Serving 'P.S Support )ode

SIP Session Initiation Protocol

S1A Service 1evel Agree!ent2M*S 2niversal Mobile *errestrial

Access

IMS Overview.ppt

Documents

Transcript of IMS Overview.ppt