IMS Services Introduction · SGSN 2G/3G RAN SIP Terminals SIP SIP GGSN AC Bearer Core Network Bearer Control and Access SPDF ... The points in the SIP signaling that may cause the

IMS Services Introduction

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Introduction

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

References

� 3GPP TS 23.002: Network architecture

� 3GPP TS 23.218: IP Multimedia (IM) session handling; IM

call model

� 3GPP TS 23.228: IP Multimedia Subsystem (IMS); Stage 2

� 3GPP TS 29.228: IMS Cx and Dx interfaces

IMS Convergent Services Solution Description

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page1

� IMS Convergent Services Solution Description

Objectives

� Upon completion of this course, you will be able to:

� Explain the advantages of IMS services

� List the different types of AS

� Explain how FC works for IMS services

� Describe some IMS services


Contents

1. Advantages of IMS Services

2. IMS Services in Standards2. IMS Services in Standards

3. Typical IMS Services


Gaming Conference

3rd Party ApplicationsSCP

IMS Network Architecture

OSSIM-SSF OSA Presence PTT IM Group

Service capability

Application

MGCF

I-CSCF

AGCFP-CSCF

S-CSCF

HSSOMS

BGCF

MRFC

MRFP

Session control

A-RACF

CCF

PCRF

NACF CLF

Bearer Control Layer

AG

IAD

PSTN/PLMN

MGW

SIP H.248

xDSL/LAN accessWiFi access

APSGSN

2G/3G RANSIP Terminals

SIP

SIP

Bearer Core NetworkGGSN AC

MRFP

BearerControl andAccess

SPDF

PCRF

H.248

Network Convergence, Service Convergence

Earlier service network Full service network

Long term development

� Convergence in：� Portal

� Service

� Network

� Terminal

Dat

a ne

twor

k

Mob

ile n

etw

ork

Fix

ed n

etw

ork

Cab

le n

etw

ork

Multiple services

Call control

Bearer network

Traditionalaccess

Wireless access

controlcontent

content

Bandwidthaccess

service

Earlier service network Full service network


Terminal network

access

IMS Services Network Architecture

Profile Shared Profile

Siloed Architecture Layered Architecture

App1

User dataBill

Application Delivery

Authentication

Session Control

Charging

OAM

App2

User dataBill


Authentication

Session Control

Charging

OAM

App3

User dataBill


Authentication

Session Control

Charging

OAM

App1 App2 App3

HSS

Standar

Profile


Redundant Functionalities

Without standard interfaces between apps

CSCFStandar

d interface

Shared

control

Contents


2. IMS Services in Standards

2.1 IMS Service Architecture

2.2 IMS Service Model

2.3 SPT and FC


2.3 SPT and FC

3. Typical IMS Services

3GPP IMS Service Functional Architecture

OSA APIOSA Service

SIP AS

AS AS

S-CSCF

OSA-ASOSA API

ISC (SIP)

Cx (Diamete

r)

HSS

Sh (Diameter)

OSA Service Capability

Server (SCS)

IM-SSF

MAP

Si

ISC (SIP)

ISC (SIP)

SCIM

MRFC MRFP

Mr (SIP)

Mp (H.248)

Provide API to the 3rd

party service providers


ISC – IMS Service Control SCIM – Service Capability Interaction ManagerOSA – Open Service ArchitectureSCS – Service Capability ServerIM-SSF – IP Multimedia Service Switching Function

IM-SSF

CSE

CAP

Interwork with the traditional IN services

IMS Service Model

Initial Filter Criteria (iFC) Subsequent Filter Criteria (sFC)

XMLsFC

SIPIncomingMessages

Originating or Terminating Filters

Initial Filter Criteria (iFC)Download atRegistration

SIP OutgoingMessages

SPT

F

ApplicationServer

F F

SIP SIPSIPXMLiFC

Subsequent Filter Criteria (sFC)Dynamic update

Routin

HSS

ApplicationServer

ApplicationServer


Filter Criteria

Originating or Terminating FiltersS-CSCF n

g

Service Triggering in IMS

� Subscription in HSS

Subscription（IMPI）

Service profile

1…n


iFCCore network

Service authorizationPublic

identification

1…n 0…1 0…n

Service Triggering in IMS (Cont.)

� Service Subscription in HSS

� IMPU: public identification � IMPU: public identification

� Core network service authorization� The media policy information are send to the S-CSCF in the core

network service authorization

� The relationship between the media policy information and the media type are stored in SCSCF

� iFC: initial Filter Criteria iFC


� iFC: initial Filter Criteria

AS

Service infoService point

trigger

Trigger Point

0…1

1…n 0…1

Service Point Trigger (SPT)� The points in the SIP signaling that may cause the S-CSCF

to send/proxy the SIP message to an SIP AS/OSA SCS/IM-SSF.SSF.� any initial known or unknown SIP method (e.g. REGISTER,

INVITE, SUBSCRIBE, MESSAGE);� presence or absence of any known or unknown header field;� content of any known or unknown header field or Request-URI;� direction of the request is with respect to the served user –

either mobile originated (MO) or mobile terminated (MT) to


Service point trigger

Request-URI SIP method SIP header Session CaseSession

description

either mobile originated (MO) or mobile terminated (MT) to registered user; or mobile terminated to unregistered user

Filter Criteria (FC)

� The information which the S-CSCF receives from the HSS or the AS that defines the relevant SPTs for a particular or the AS that defines the relevant SPTs for a particular application.

� A Filter Criteria contains:

� address of the Application Server

� priority of the Filter Criteria

� Trigger Point composed by 1 to n instances of the Service Point


Triggers (SPTs)

� default handling

� Initial Filter Criteria (iFC) vs. Subsequent Filter Criteria (sFC)

Initial Filter Criteria � Script of iFC


Initial Filter Criteria Triggering Example

AS1 AS2HSSSh Sh

Filter Criteria X � AS1

Filter Criteria Y � AS2

S-CSCF

Incoming call legOutgoing call leg1

2 3

4b

4a

6

5a

ISC ISCCXSIP message possibly with modification by AS1

SIP message possibly with modification by AS2


4b 6a

SIP message forwarded by S-CSCF

SIP message forwarded by S-CSCF

Contents


2. IMS services in Standards2. IMS services in Standards

3. Typical IMS services

3.1 Services in IMS

3.2 Traditional Telecommunication Service


3.3 Value-added Services

3.4 Other Services

Other services

Services in IMS

Traditional telephony

services• Basic

services• VCC• CSI

Value-added Services• Presence• Group • Conference

Services in IMS


BasicSupplementary

• Conference• Messaging• ……

Traditional Telecommunication Services

� Basic telecommunication services� P2P Voice call� P2P Voice call� P2P Video call� Emergency call

� Supplementary services� CLIP� CLIR� CFU

IMS Core

AS

AS

AS


� CFU� CFB� CW� HOLD� ……

Voice over IPVideo over IP

Traditional Telecommunication Services

Service Layer

PES AS PSS ASOther AS

P/I/S-CSCF & AGCF MGCF / I-BCFHSS

EMS

PSTN

Session Control Layer

Access and Interworking Layer

P/I/S-CSCF & BGCF

AGCF MGCF / I-BCF

NASS RACS

C-BGFH.248 AGW

IM-MGW / I-BGF

HSS

Access transport

Core transport

Other VoIP network

AGW

SIP RG/AG SIP Phone PC Phone

POTS/ISDN

POTS/ISDN

PES-PSTN Emulation Service

PSS-PSTN Simulation Service

� Presence: availability and willingness of the user for communication.

� Presence Information

Presence

� Presence Information� Client Status Attributes

� Client device availability: My phone is on/off, in a call� Client device capabilities: Voice, text, GPRS, multimedia� Client location

� User Status Attributes� User availability: User is available/unavailable, in a meeting

Busy Idle Hiding

Off-line CustomNo-

subscriber


� Preferred contact method and contact information� Searchable personal statuses:

– Mood: Happy, angry, ...– Hobbies: Football, fishing, computing, dancing, …– …

Location, feeling, status, profile and …

Presence: Use Case

Haven’t seen David for a long time. Say hi to him.

Bob is busy now. Send him a voice mail.

John is in meeting. I’ll Mike is free now.


John is in meeting. I’ll send a piece of message to him.

Mike is free now. Maybe we could have a video talk.

Publish

After the successful subscription of A’s presence info, B can get A’s presence information in time. A grant B

Presence Service Flow

MS A is online and set the presence info to

Presence ServerMS A

200 Okay

Subscribe

AckN

otify

Ack

information in time. A grant B the presence subscription rights.


in meeting.

MS B

The presence update of A is notified to B in real time.

Group

� As a service enabler, Group can manage both public and private groups, and help private groups, and help accomplish personal information management (PIM).

� Group information is stored in XML documents.

� Based on XCAP (XML Configuration Access Protocol).

Key enabler to a variety of

Public groups


� Key enabler to a variety of services, such as PoC, messaging and conference service, etc.

Private groups

Group Use Casea

� Personal contact list

Corporation address book� Corporation address book

� Shared public group


Group Server

Personal contact list management

Contact list in the network, much safer for the

Group Service Flows

Group Server

Application Server

management much safer for the information

UE A

Group session initiation

Session based on group


Group Server

UE B

group

Group can be used in a variety of services.

Messaging

A group of services, supported by capabilities of t he 3GPP IP Multimedia Subsystem 3GPP TS 22.228 [7], that al lows an IMS user to send and receive messages to other u sers.

Features:

� Include immediate messaging and session based

messaging.

� Multimedia, including text, pictures, video,

audio…

� Either be an independent AS or a service enabler


� Integration with SMS, MMS and email

Text Picture Music Voice Video File

Messaging Features

� 1-1 messaging� Many-many messaging� Message to group� Message to group� Chat room

� Blacklist� Anonymous messages� History messages� Message broadcast� Attachment of files� Alarm message

� Priority of subscribers: higher priority, low priority� Offline message


� Offline message� For other services, working as an enabler for example,

in Conference AS

Messaging Service Flows【【【【Recipient Status 】】】】

�Retrieve the presence info from PS 【【【【Group List 】】】】

�Retrieve the group info from GM AS if the receiver is a group ID

【【【【Charging 】】】】

�By pieces, by traffic…�Send CDRs

【【【【Message Handling 】】】】

�Filter

【【【【Trigger 】】】】�Trigger to AS according to the iFC(iFC is downloaded from HSS)

�Filter�Send and receive

【【【【Short Message 】】】】

�Interworks with SMC

【【【【Delivery Report 】】】】

�Send DR to the Sender


【【【【Edit】】】】�Input the receivers (one or more user number, group ID)�Attachments

PoC

� Push To Talk over Cellular (PoC) service is a two-way form

of communications that allows users to engage in of communications that allows users to engage in

immediate communication with one or more users.

� Half-duplex one-to-one or one-to-many call

� Instant communication

� Group communication


Group communication

� VOIP

� PoC supported UE

PoC Communication Methods

� 1-1 Session

� 1-Many Session

� Pre-arranged Group

� Chat Group

� Instant Personal Alert


PoC Use Cases

Young People

Traffic Control

exhibitionRestaurant

Enterprise Firemen

Family Friends

Airport

Army


Control

Emergency Action

Hospital

Security PolicemanCarrying Trade

AirportTourism

Conference

� The Conference of the IMS may support multimedia, such as audio and video.

Voice conference� Voice conference

� Messaging conference

� Multimedia conference


Basic Capabilities of an Ideal Conference AS

Video CallMultiple Service Capabilities Digital CallVoice Call

Company A Company B

Branch A1Individual F

Flexible Service Implementation

Long term lease, secondary operation Conference Reservation Ad-hoc Conference

Anyone, Anytime, Anywhere, Any terminals

Branches Company StaffCorporations IndividualsCompany C

Branch A2Branch B1 Individual C Individual D

Individual E

Multiple Terminals

Different Scenario

Anyone, Anytime, Anywhere, Any terminals

Conference Service Flow Example

� Example: � An ad-hoc conference with the

access number 95056� Anyone can start a conference� Conference host pays the bill

A starts a conference (95056+1)

A invites B

B acknowledges and attends the conference

A acknowledges and C is in the conference


User BNumber: 8888888User A

Number: 7777777

User CNumber: 9999999

C Calls A and asks the right to attend the conference

(95056+2+7777777)

V2CC - Seamless Multimedia Communication

IMS HSS

VCC AS

SIP

CS IMSHLR

MAPSCP

SMS-C

MAP

IMS Core

WiFi

Broadband

Centrex AS

MGCF

DiameterSIP

SIP

MGW

CAP

SMS-C

MAP

MAP

MAPMAP

ISUP

Cellular


0612345678

GSM-MSRN

0612345678

[email protected]

IMS based FMC VCC Solution

VCC-Voice Call Continuity

Key Features� Inherit IP PBX features Call

Hosted PBXIP Centrex

IntegrationE-MailNOTES

IT integration

Convergent IP Centrex for Enterprises

� Inherit IP PBX features� Full support of IT integration

capabilities such as email, notes, portal, DNS, address book. It can Increase Productivity

� Diverse fixed and wireless terminals support, POTS, PC, PDA, Mobile Handsets etc.…

� Huawei IP centrex can integrate with Voice Mail System.

Target Market

Call ForwardingCall WaitingCall TransferConferencing

…

NOTESOFFICE

PORTALPersonalizedWeb-basedSelf-Care

MobilityDesktopin your palm CSC3300

ETAS9900

SoftX3000 Diverse Terminals


Target Market� High end enterprise subscribers� Residential subscribers� Specific group communication

Converged IP Centrex For Enterprise-Comparison

Switch/Softswitch

Traditional IP Centrex IMS-based IP Centrex

ETAS9960

Web Portal

IMS Core

IAD

CSC3300

HSS9820

GCF3100

SGSN

GGSN

AP

IAD

SE2300 SE2300

IMS Core

� Full features derived from NGN traditional IP Centr ex

� Support enterprise across different domains and mul ti-access modes

� Support Click to Dial, Intelligent routing and web self-care, etc.

� More enhanced functionalities, like integrated with PS/GLMS/IM

� Provide Third Party Call Control interface allowing externally applications to be developed

Summary

� Advantages of IMS Services

IMS services in Standards� IMS services in Standards

� Typical IMS services


IMS Services Introduction · SGSN 2G/3G RAN SIP Terminals SIP SIP GGSN AC Bearer Core Network Bearer Control and Access SPDF ... The points in the SIP signaling that may cause the

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