IMS Services Introduction - · PDF fileGaming Conference 3rd Party SCP Applications IMS...
Transcript of IMS Services Introduction - · PDF fileGaming Conference 3rd Party SCP Applications IMS...
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
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� 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
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page2
Contents
1. Advantages of IMS Services
2. IMS Services in Standards2. IMS Services in Standards
3. Typical IMS Services
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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
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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
Application Delivery
Authentication
Session Control
Charging
OAM
App3
User dataBill
Application Delivery
Authentication
Session Control
Charging
OAM
App1 App2 App3
HSS
Standar
Profile
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Redundant Functionalities
Without standard interfaces between apps
CSCFStandar
d interface
Shared
control
Contents
1. Advantages of IMS Services
2. IMS Services in Standards
2.1 IMS Service Architecture
2.2 IMS Service Model
2.3 SPT and FC
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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
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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
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Filter Criteria
Originating or Terminating FiltersS-CSCF n
g
Service Triggering in IMS
� Subscription in HSS
Subscription(IMPI)
Service profile
1…n
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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
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� 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
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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
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Triggers (SPTs)
� default handling
� Initial Filter Criteria (iFC) vs. Subsequent Filter Criteria (sFC)
Initial Filter Criteria � Script of iFC
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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
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4b 6a
SIP message forwarded by S-CSCF
SIP message forwarded by S-CSCF
Contents
1. Advantages of IMS Services
2. IMS services in Standards2. IMS services in Standards
3. Typical IMS services
3.1 Services in IMS
3.2 Traditional Telecommunication Service
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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
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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
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� 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
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� 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.
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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.
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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
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� 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
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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
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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
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� 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
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� 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
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【【【【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
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Group communication
� VOIP
� PoC supported UE
PoC Communication Methods
� 1-1 Session
� 1-Many Session
� Pre-arranged Group
� Chat Group
� Instant Personal Alert
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PoC Use Cases
Young People
Traffic Control
exhibitionRestaurant
Enterprise Firemen
Family Friends
Airport
Army
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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
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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
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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
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0612345678
GSM-MSRN
0612345678
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
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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
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