International Telecommunication Union
ITU-T
Migration Scenarios to NGN
Steven Lim Shue Ping
Product Manager – NGN Voice Solutions
Siemens Communications Fixed Network Asia
Pacific Regional Headquarter
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
VoIP – The POTS of the Future
The VoIP market is taking off in all regions of the world
ITU-T
Embedded Telephony Subscriber Base
1,5
VoBB
Subscriber Lines
(in billions)
IP-based
NGN-based
POTS
1,0
TDM-based
0,5
0,0
2002
2003
2004
2005
2006
2007
2008
2009
2009
2015
Source: ITU Main Telephone Lines and Dell’Oro Group estimates (Q2/2005)
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
2
NGN Migration Approaches
ITU-T
o
Two steps to migrate to NGN:
• Softswitch based PSTN Emulation
— Highlights : 100 % preservation of TDM voice
features
• IP Multimedia Subsystem (IMS) based PSTN
Simulation
— Highlights : Some important voice features +
NEW multimedia services
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
3
Definition
ITU-T
o
PSTN/ISDN Emulation
Mimicking a PSTN/ISDN network from the point of
view of a legacy terminal by an IP network, through a
gateway. All PSTN/ISDN services remain available and
identical (i.e. with the same ergonomics) such that
end users are unaware that they are not connected to
a TDM-based PSTN/ISDN.
o
PSTN/ISDN Simulation
The provision of PSTN/ISDN-like services to advanced
terminals such as IP-phones. There is no strict
requirement to make all PSTN/ ISDN services available
or identical, although end users expect to have access
to the most popular ones, possibly with different
ergonomics.
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
4
NGN Architecture
ITU-T
Rf /Ro
ASAS
Network
Attachment
Subsystem
HSS
Functions
Functions
Ia
Dh
ISC
Charging
Charging
Sh
Cx
Cx
Rf /Ro
IWF
Ib
SLF
Mw
S-CSCF
If
Mw
Mj
Mg
Id
MGCF
SGF
PSTN/ISDN
Mn
Ie
Other IP Networks
MRFC
Mp
Resource and Admission Control Subsystem
A-BGF
UE
Ic
BGCF
Gq
Gm
IBCF
Mi
Mr
P-CSCF
Mw/Mk/Mm
I-CSCF
Mi
Core IMSMw
Dx
MRFP
T-MGF
IP Transport (Access and Core)
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
I-BGF
5
PSTN Emulation Architecture
ITU-T
PSTN Network
SIP-I
Management System
Signaling Gateway
Switch
Softswitch
SS7oIP
SS7
STP
SS7
POTS/ISDN
H.248
H.248/MGCP
POTS
ISDN
xDSL
IP
DLU
DLU IP
H.248
Multi-Service
Access Node
Digital Line Unit
Other
access equipment
DLU
DLU
MGCP
H.248
Resource
Server
Media Gateway
for Trunks
V93
ISDN-PRI
V5.2
IP Core Network
Media Gateway
for Access
POTS/ISDN
Multi-Service
Access Node
xDSL
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
6
Highlights for Softswitch based PSTN Emulation
ITU-T
o
o
o
o
o
o
o
Provides current PSTN/ISDN services
with an unchanged presentation (100% feature
preservation) for all interfaces
Services/features provided by call control of
Softswitch
H.248 control of Access Gateways
Covered by existing ETSI TISPAN and ITU-T
standards
Emulation domain (softswitch) and IMS session
control are interworking via SIP
Possibility to re-use installed access equipments
(POTS, ISDN, PRI, CAS etc)
Protection of embedded subscriber base through
immediate migration
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
7
Migration Scenario – Class 4
ITU-T
TDM Network
TX
TX
TX
Switch
Switch
other PSTN
other PSTN
LX
Carriergrade IP
Value proposition
! Reduction of network elements to be managed
! Reduction of operational expenses (OPEX)
! Efficient, simpler architecture based on IP
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
8
Migration Scenario – Class 5
ITU-T
TDM Network
Switch
Switch
other PSTN
other PSTN
LX
Carriergrade IP
IP
IP
DLU
DLU IP
Value proposition
! Reduction of network elements to be managed
! Reduction of operational expenses (OPEX)
! Grow on IP -> Future Proof solution ..
! 100% preservation of Class 5 features
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
9
PSTN Simulation Architecture
ITU-T
Voice and Video Telephony
Messaging
Video Mail
Unified Messaging
Push to Talk
IP Centrex
Conferencing
Voice Application Server
Presence
Applications
PSTN/ISDN
SIP
HSS
MGCF & AGCF
PSTN Simulation
Diameter
PSTN Emulation
SS7
SIP
Trunk MGW
CSCF
PSTN
IMS
H.248
Access GW
SIP
DLU
DLU
PBX
Broadband Subscribers
Narrowband Subscribers & Legacy Access Equipments
xDSL, WiFi, GPRS, UMTS
POTS, ISDN BRI, ISDN PRI
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
10
Highlights of PSTN Simulation based on IMS
ITU-T
o
o
o
o
o
o
Focus on New Multimedia services
Advanced Multimedia services like push-to-talk,
video conferencing, IP centrex etc
Converged services across different acccess
domains, eg: mobile networks, broadband
wireline networks (xDSL, FTTH etc), WiFi
Voice service is limited to simulation, with SIP
based voice application server
Most commonly used and popular voice services
are simulated (eg: CLIP, Call Forwarding etc) –
PSTN Simulation
Interworking with PSTN Emulation domain via SIP
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
11
IMS is a key element in NGN network evolution
ITU-T
o
o
o
o
IMS (IP Multimedia Subsystem) is the common
control infrastructure for real-time and non-realtime end-to-end multimedia services and any
mixture of those
IMS is designed and standardized by 3GPP to
integrate smoothly with existing mobile and fixed
networks
New and existing services (e.g. Presence,
Location) and applications can be connected and
controlled by IMS through the standardized ISC
interface
By using SIP (Session Initiation Protocol) IMS based
services can be accessed from any IP/SIP capable
device (UMTS, GPRS, WLAN, wireline users, etc. )
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
12
IMS allows efficient application integration
ITU-T
o
No IMS: - repeated vertical integration
- no synergies!
o
With IMS: - one-time integration
Application 1 ... n
Application 1 ... n
...
...
IMS
Specific Sign-on
Authentication
Specific Sign-on
Authentication
Single Sign-on
Authentication
Specific Billing
Specific Billing
One Billing
Specific
Session Control
Specific
Session Control
One Multimedia
Session Control
Specific Database
per Application
Specific Database
per Application
Global
User Database
Specific Network
Integration
Specific Network
Integration
Common network
Integration
Specific O&M
Specific O&M
Common O&M
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
13
IMS as Service Delivery Platform
– Mobile IP Centrex
ITU-T
Media Gateway
Controller
Mobile Centrex
Server
Call Session
Control Function
IP Network
PLMN
Gateways
UMTS
IP
GSM
Terminal
UMTS
Terminal
PDA
SIP Phone
SoftPhone
Mobile IP Centrex Group
o Hybrid Centrex Groups
• SIP phones
• GSM / UMTS phones
(2G, 2.5G & 3G)
o Wide range of enterprise
features to all this device
types under a single
platform
o Common feature set to
business group users
connected via fixed IP
phones/Softphones, mobile
phones
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
14
IMS as Service Delivery Platform
– Video Call Applications
ITU-T
VIDEO TELEPHONY
o
o
o
o
VIDEO PORTAL
VIDEO MAIL
VIDEO
CONFERENCING
Video Telephony is provided to SIP clients with
interworking with 3G.
Video portal enables SIP/3G users to stream video contents
from portals
Video Mail enables to access their recorded video mails,
and also to record a videomessage to answer calls
Video Conferencing enables users to establish video
conferences with up to 16 participants per conference
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
15
IMS as Service Delivery Platform
– One Number Service
ITU-T
MM
VAS
ISUP
SIP (ISC)
HSS
CSCF
MAP
SS7
SS7
PSTN
MGCF
SIP
MGW
HLR MSC/VLR
SIP
GGSN/SGSN
RAN
GSM/GPRS
SIP Phone
Analogue
Phone
WiFi CPE
DualMode
Handset
o The Voice Application Server is used to provide call
supplementary services for all IMS subscribers. The
Mobility Management Application Server provides roaming
between mobile network and IMS network
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
16
Migration to NGN today for the benefits tomorrow
ITU-T
o
Defend
o
Attack
Migration towards NGN with PSTN Emulation
based on softswitch
•
•
Introduction of IMS as service delivery platform
•
•
o
Exploit
IP based, flatten, simplified network
100 % preservation of TDM voice features
Introduction of SIP based, revenue generating
applications to increase ARPU, eg: Mobile IP
Centrex, Video call applications etc
Fast, simple introduction of new services
Provides attractive service bundling
•
•
Reduce churn rate with triple play services
One platform for video, voice and data
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
17
Case Study KPN, Netherlands
ITU-T
Po
w
S ere
Tec ieme d by
hn ns
olo
gy
Attack
Case
stud
y
In Q2 2005, KPN
launched
'Internetplusbellen'
Defend
Exploit
Leadership of
converging
communications
market
The cornerstone
of KPN strategy
GO FOR VoIP
The
The bundle
bundle price
price
for
this
combined
for this combined
subscription
subscription
costs
costs less
less than
than
two
separate
two separate
subscriptions
subscriptions for
for
telephony
and
telephony and
Internet.
Internet.
An innovative total
package that offers
unlimited calls in the
weekend to all fixed
lines in the Netherlands
and unlimited ADSL
(800Kbs) in one single
subscription for € 34.95
“There has been a change of pace at KPN this year. We have put our innovation initiatives in high gear, and the roll out of our
strategy to attack new revenue opportunities, defend our leading share for traditional services and exploit a structurally lower
cost base is on track. We are delivering on our promises, with increased revenues and an improving margin ... With the launch
of Consumer VoIP services we took the first steps in our migration to an all IP network, the future basis for all our services."
Ad Scheepbouwer, CEO of KPN, August, 2005
"In the years ahead KPN and its customers will be entering an IP world in which communication is set to change
fundamentally. … SIEMENS' strength in fixed and mobile networks was obviously extremely important to us.”
Eelco Blok, KPN managing board member, December 2004
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
18
ITU-T
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
19