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Contents
 Background
 PSTN Migration to NGN
 TTA’s Draft NGN Reference Model
 NGN Convergence
 NGcN Vision
 Summary & Discussion
29/04/2003
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Slide 2
Background
 Korean operators recognized enough reason to NGN
– Shift of major voice market from fixed to mobile, in Korea, since 1999
– Internet data traffic and revenue exceed legacy service in Korean fixed
operators, since 2000
• Internet/data/leased service have become major revenue stream for them
• Need of transfiguring the network for advanced accommodation is raised
– Saturation of broadband Internet access is estimated, within several years
• A new tractor for expanding service opportunity and market are desired
• Trend of IP based convergence is expected to generate new opportunities
– Cellular operators also have deep interest on NGN
• Recent development of advanced mobile technology has become IP centric
 NGN deployment is currently ongoing in Korea
– Fixed operators started AGW/SSW deployment since 2002, under a stepwise plan
– Pursuing unified management profit over packet based functions in the initial stage,
and enhancement of service capability with advanced network in the next
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Slide 3
NGN Model for PSTN Migration




Basically Operator’s view
Stepwise migration of legacy service & resource are mostly emphasized
PSTN centric, “national infrastructure” approach minimizing risk
Not so much prompt return benefit from the investment
SCP
Stepwise
substitution
with AGW
No.7 Signaling Link
No.7
Toll/Tandem
Switch
Toll/Tandem
Switch
Local Switch
Trunk
User side
Integration with
AGW
Toll/Tandem
Network
Trunk
Trunk
Trunk
SSW
SSW
Local Switch
Trunk
SGW
TGW
AGW
Turnover
Link
AGW
DSL
IP Network
IAD
IP Termination
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AS
AS
IP Termination
Curtsy of KT
Slide 4
TTA’s Draft on NGN Reference
Model

Access focused view assuming stable & secure backbone core
 Debating/editing is ongoing in TTA, concerning many international models
 Eligible to realize multimedia service
VoP and
multimedia Service/control Domain
SDB
Legacy
PSTN
SOHO
network
VG
Hb
DP
DP
Aa
Ha HG/ Ad
Ab LC Ac
LT
NT
Ac
Aa
Ha
TG
SG
rAG
Cg
AP Server
Sa
Cc
SCP
Cb
Ca
ASS Cd
TSS
Ca
Ca
Ba MRF
Ba
SCP
TSR
Cf
Bb
Ce
TSS
Cf
CSR
Bc
CSR
AG
Ac
Da
AR
Db
BR
Dc
BR
Best Effort Internet Domain
Customer Premise
Network
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Da
Access Network
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AR
Db
BR
Dc
BR
IPv6 based Internet
Core Network
Slide 5
NGN Premium Network Concept
 VoIP NGN vision of the PSTN trunk
 Consensus has been developed on the IP based unified core network capable to
accommodate number of logical networks using different QoS and levels of
security feature
 AG distinguishes difference of the premium link & best effort link as of Diffserv
boundary node; several types of implementation for links differentiated
 Eligible to establish convergence networks




Soft
switch
Access
Access
Access
Soft
switch
MAG
MAG
MAG
TG/SG
QoS guaranteed
VoP Premium
IP Network

PSTN/PLMN
TG
IPv6
Intranet based
on MPLS
IPv6
Gate
Keeper
Internet
Other
operator’s NGN
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Slide 6
IP CoreNet Convergence
 This Core IP network can replace the role of the legacy PSTN core functions and
services, and provide fundamental capability of network convergence
 All IP/NGN converged core network support all voice and internet packet data
services regardless of the access network types , with no impact on the access
network
 Rather this convergence vision is widely accepted in Korean telecom industry,
and a standard activity including NGcN (Next Generation convergence Network)
forum has been issued since last year
PSTN/PLMN
WMAN
Best effort N/W
2W Loop/
xDSL
HFC
IM subsystem
network (IPv6)
VoP Premium
IP network
2G/3G all IP
Cellular
WLAN
Metro
Ethernet
Converged IP Network
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Slide 7

Trend & Vision of NGcN
Evolution
Under the initiative of NGcN, HFC based Broadcasting convergence is issued

WLAN/Hotspot/2.3GHz technologies are to stimulate NGcN initiative more
Legacy FMC
Fixed
interworking
Internet
Backbone & convergence
technology upgrade
Circuit-packet
TNM convergence
Service enhancement Open architecture
Broadcasting convergence
NGN
Optical Internet Everything on IP
Diffserv/QoS
IPv6
NGI
interworking
All IP
High speed Portable Internet
B3G Mobile
Mobile
current
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NGcN
Ubiquitous
Multimedia
Infrastructure
Mobile
multimedia
access &
platform
Step 1
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Step 2
Step 3
Slide 8
Summary
 There are two conflicting positions in Korea, about the path toward NGN;
“guaranteeing stable migration of infrastructure” or “launching to the early
deployment of emerging multimedia service”
 Nonetheless of their pros and cons, we see that the different positions
interfere smooth and stable standardization of NGN
 However, one fortunate aspect is wide consensus on the ultimate
convergence of various networks into one transport based on IP
 Leading NGN technology with the promising vision of NGcN is believed
of great help to astringent different positions in its deployment
 The initiative NGcN has provided new technical momentum along with the
sense of convergence, such as broadcasting-telecom convergence in Korea
 NGcN is believed to generate more opportunities of advanced technology
development while restructuring existing communication service market
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Slide 9
Issues for Discussion
 GSC is invited to note the importance of the work on ultimate network
convergence aspect actually leading NGN realization
 There are a lot of standardization effort in various standard bodies, on the
convergence aspect involved in many different fields of technology such
as broadcasting, WMAN, and home networking
 It is suggested that GSC to identify ways to collaborate with
those effort in order to establish a vision of “extended NGN”
incorporating diverse technologies outside NGN scope, under
the concept of convergence
 Such activity is believed to encourages timely deployment of rich and
economical NGN service and network
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Slide 10