IMS Services Introduction
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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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Page1
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
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Contents 1. Ad Adva vant ntag ages es of IMS IMS S Ser ervi vice ces s .
erv ces n tan ar s
3. Typical IMS Services
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Page3
IMS Network Architecture SCP
Gaming
3rd Party Applications
Conference
Application Service
OSS IM-SSF
OSA
Presence
PTT
IM
Group
capability
HSS OMS
S-CSCF
I-CSCF BGCF
CCF
P-CSCF
MRFC
AGCF
AC
Bearer Core Network
SIP
SIP
2G/3G RAN
SIP
H.248 AG
AP
SGSN
CLF
Bearer Control Layer
SPDF GGSN
MGCF
NACF
A-RACF
MRFP
Session control
WiFi access
SIP Terminals
H.248 MGW
IAD
xDSL/LAN access
PSTN/PLMN
Bearer Control and Access
Network Convergence, Service Convergence Long term development Earlier service network
Full service network
Multiple services
content
Call cont ntro roll Call co
content
service k r o w t e n e l i b o M
k r o w t e n d e i x F
k r o w t e n a t a D
k r o w t e n e l b a C
control
Bearer network Wireless access TraditionalBandwidth access
Term erminal inal net network work
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Convergence in：
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Portal
Service Network
Terminal
IMS Services Network Architecture Siloed Architecture
Layered Architecture
Profile User data Bill
User data Bill
User data Bill
App1
App2
App3
OAM
OAM
OAM
Charging
Charging
Charging
Application Delivery
Application Delivery
Application Delivery
Authentication
Authentication
Authentication
Session Control
Session Control
Session Control
Shared Profile HSS
App1
Redundant Functionalities
d interface Without standard interfaces between apps
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Share d contro l Page6
App2
CSCF
App3
Contents 1. Advantages of IMS Services 2. IM IMS S Serv Servic ices es in Stan Standa dard rds s 2.1 IMS Service Architecture 2.2 IMS Service Model .
3. Typical IMS Services
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Page7
3GPP IMS Service Functional Architecture SIP AS AS
AS
Capability Server (SCS)
SCIM Sh (Diameter)
HSS
OSA-AS
ISC (SIP) ISC (SIP)
S-CSCF Cx (Diamete r) Si
Mr (SIP) ISC (SIP)
MRFC
Mp (H.248)
MRFP
Provide API to the 3rd party service providers
MAP
IM-SSF CAP
CSE
Interwork with the traditional IN services
ISC – IMS Service Service Contr Control ol SCIM – Service Capabilit Capability y Interac Interaction tion Manager Manager OSA – Open Service Architecture Architecture SCS – Service Capability Capability Server IM-SSF IM-SS F – IP Multim Multimedia edia Service Service Switch Switching ing Function
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Page8
IMS Service Model Subsequent Filter Criteria (sFC) Initial Filter Criteria (iFC) Dynamic update Download at Registration Application Application Application Server Server Server HSS XML SIP SIP XML SIP iFC sFC
Incoming Messages
SIP
S P T S-CSCF
F F F Originating or Terminating Filters Filter Criteria
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R o u t i n g
SIP Outgoing Messages
Service Triggering in IMS
Subscription in HSS Subscription （IMPI） 1…n
Service profile 1…n Public identification
0…1
0…n
Core network Service authorization
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iFC
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Service Triggering in IMS (Cont.)
Service Subscription in HSS
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
iFC: initial Filter Criteria 0…1
AS
Trigger Point 1…n Service point trigger Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
0…1 Service info
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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.
any initial known or unknown SIP method (e.g. REGISTER, INVITE, SUBSCRIBE, MESSAGE); field; presence or absence of any known or unknown header field; content of any known or unknown header field or Request-URI Request-URI;; direction of the request is with respect to the served user – either mobile ori inated M or mobile terminated MT to registered user; or mobile terminated to unregistered user Service point trigger
Request-URI
SIP method
SIP header
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Session Case
Session description
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Page12
Filter Criteria (FC)
The information which the S-CSCF receives from the HSS 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)
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Initial Filter Criteria
Script of iFC
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Initial Filter Criteria Triggering Example Sh
Sh
AS1
AS2
HSS 2
3
ISC
SIP message possibly with modification by
CX
4 a
AS1
ISC 5 SIP message possibly a with modification by AS2
Filter Criteria X AS1 Incoming call leg 1
Filter Criteria Y AS2 S-CSCF a
SIP message forwarded by S-
SIP message forwarded by S-
CSCF
CSCF
Outgoing call leg
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Page15
Contents 1. Advantages of IMS Services .
serv ces n
an ar s
3. Typic ical al IM IMS S ser servi vice ces s 3.1 Services in IMS 3.2 Traditional Telecommunication Service 3.3 Value-added Services 3.4 Other Services
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Page16
Services in IMS Other
Services in IMS
Traditional telephony services • Basic
Supplementary
Value-added Services • Presence • Group • Conference • Messaging • ……
• VCC • CSI
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Traditional Telecommunication Services
Basic telecommunication services
P2P Video call Emergency call
AS AS
AS
Supplementary services
CLIP
IMS Core
CLIR CFB Video over IP
CW HOLD ……
Voice over IP
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Traditional Telecommunication Services PES AS
PSS AS
Other AS EMS
Service Layer AGCF
P/I/S-CSCF & BGCF
MGCF / I-BCF
HSS
Session Control Layer
NASS RACS
Access and Interworking Layer
H.248
C-BGF Access transport
POTS/ISD N
IM-MGW / I-BGF
PSTN
Core transport Other VoIP network
POTS/ISD N
PES-PSTN Emulation Service SIP RG/AG
SIP Phone
PC Phone
PSS-PSTN Simulation Service
Presence
Presence: availability and willingness of the user for communication.
Client Status Attributes
Client device availability: My phone is on/off, in a call Busy Client device capabilities: Voice, text, GPRS, multimedia Client location Off-line
Idle
Hiding
Custom
Nosubscriber
User Status Attributes
User availability: User is available/unavailable, avai lable/unavailable, in a meeting Preferred contact method and contact information Searchable personal statuses: Location, feeling, – Mood: Happy, Happy, angry, ... – Hobbies: Football, Football, fishing, computing, dancing, … – …
status, profile and …
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Presence: Use Case Haven’t seen David for a long time. Say hi to
Bob is busy now. Send him a voice mail.
him.
. ’ send a piece of message to him.
Maybe we could have a video talk.
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Page21
Presence Service Flow Publish
200 Okay MS A
MS A is online on line
Presence Server
S N u o b t i f s y c r i b e
After the successful subscription of A’s presence info, B can get A’s presence presenc e information in time. A grant B the presence subscription rights.
A A c k c k
and set the presence info to in meeting. The presence update of A is notified to B in real time. MS B
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Page22
Group
As a service enabler, Group can manage both , public and accomplish personal information management (PIM).
Public groups
Group information is stored in XML documents. Based on XCAP (XML Configuration Access Protocol). Key enabler to a variety of services, such as PoC, messaging and conference service, etc.
Private groups
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Group Use Casea
Personal contact list
Corporation address book
Shared public group
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Group Service Flows Personal contact list
Contact list in the network, much safer for the information
Group session initiation
UE A
Session based on rou
Application Server
Group can be used in a variety of services. UE B
Group Server
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Page25
Messaging A group of services, supported by capabilities of the 3GPP IP Multimedia Subsystem 3GPP TS 22.228 [7], that allows an IMS user to send and receive messages to other users.
Features:
Include immediate messaging and session based messaging.
Multimedia, including text, pictures, video, audio…
Either be an independent AS AS or a service enabler
Integration with SMS, MMS and email
Text
Picture
Music
Voice
Video
File
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Page26
Messaging Features
1-1 messaging
Many-many Messa e to messaging rou Chat room
Blacklist
Anonymous messages History messages Message broadcast Attachment of files Alarm message Priority of subscribers: higher priority, low priority For other services, working as an enabler for example, in Conference AS
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Page27
Messaging Service Flows 【Recipient Status】
Retrieve the presence info
from PS
Charging 【pieces, 】 By by traffic… Send CDRs
【Group List】
Retrieve the group info
from GM AS if the receiver is a group ID
【Message Handling】
Send
【Delivery Report】
Send
and receive
DR to the
Sender 【Short Message】
【Trigger】
Interworks with SMC
Trigger the iFC to AS according to
(iFC is downloaded from HSS)
【Edit】
Input the receivers (one or
more user number, group ID) Attachments
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Page28
PoC
Push To Talk over Cellular (PoC) service is a two-way form 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
Grou commun munication ion
VOIP
PoC supported UE
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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
Family
exhibition
Friends
Restaurant Army Traffic Control
Enterprise
Firemen
Tourism
Carrying Trade
Policeman
Security Hospital
Emergency Action
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Conference
The Conference of the IMS may support multimedia, such as audio and video.
o ce co con erence
Messaging conference Multimedia conference
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Basic Capabilities of an Ideal Conference AS Multiple Service Capabilities
Voice Call
Flexible Service Implementation
Long term lease,
Digital Call
Video Call
Conference Reservation
Ad-hoc Conference
secondary operation
Company B
Company A
Individual F Branch A1
An one, An time, An wh whe ere, An terminals Individual E
Different Scenario Multiple
Branch A2
Branches
Company C
Corporations
Branch B1
Individual C
Company Staff
Individual D
Individuals
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)
B acknowledges and attends the conference A invites B
A acknowledges and C is in the conference
C Calls A and asks the right to attend the conference (95056+2+7777777)
User A Number: 7777777
User C Number: 9999999
User B Number: 8888888
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V2CC - Seam Seamless less Mul Multim timedia edia Com Commun municat ication ion MAP
HLR
CS
MAP
VCC AS
IMS
IMS HSS SIP
SCP SMS-C MAP CAP
Centrex AS
Diameter
MAP
SIP
SIP
MAP MAP
MGCF
IMS Core
ISUP
Broadband
Cellular MGW
WiFi
0612345678
0612345678
GSM-MSRN
[email protected]
VCC-Voice Call Continuity IMS based FMC VCC Solution
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Page35
Convergent IP Centrex for Enterprises
Key Features
Hosted PBX
IT
IP Centrex
integration
Full support of IT integration capabilities such as email, notes, portal, DNS, address book. It can
Forwarding Call Waiting Call Transfer Conferencing
Increase Productivity Diverse fixed and wireless terminals
…
support, POTS, PC, PDA, Mobile Handsets etc.…
Huawei IP centrex can integrate inte grate with Voice Mail System.
PORTAL Personalized Web-based Self-Care
ETAS9900
Mobility Desktop in your palm
SoftX3000 CSC3300
High end enterprise subscribers Residential subscribers Specific group communication
Integration E-Mail NOTES OFFICE
Diverse Terminals
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Page36
Converged IP Centrex For EnterpriseTraditional IP Centrex Comparison
IMS-based IP Centrex ETAS9960
Switch/Softswitch
Web Portal
HSS9820 CSC330 0
GCF3100
GGSN IAD
SE2300
SE2300
SGSN AP IAD
Full features derived from NGN traditional IP Centrex
Support enterprise across different domains and multi-access modes
Support Click to Dial, Intelligent routing and web w eb self-care, etc.
More enhanced functionalities, like integrated with w ith PS/GLMS/IM
Provide Third Party Call Control interface allowing externally applications to be developed
Summary
Advantages of IMS Services serv ces n tan ar s Typical IMS services
