Contents

1. Contents • Background • PSTN Migration to NGN • TTA’s Draft NGN Reference Model • NGN Convergence • NGcN Vision • Summary & Discussion GSC-8, OTTAWA

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 GSC-8, OTTAWA

3. Migration To IP net Migration To IP net Trunk Trunk 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 No.7 Signaling Link Stepwise substitution with AGW No.7 Toll/Tandem Toll/Tandem Switch Local Switch Switch Local Switch Toll/Tandem Trunk Trunk Trunk Trunk Network User side Integration with AGW Trunk SSW SGW SSW TGW Turnover Link AGW AGW DSL IP Network IAD AS AS Curtsy of KT IP Termination IP Termination GSC-8, OTTAWA

4. Db Dc Da AR BR BR Best Effort Internet Domain 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 AP Server SDB Sa TG Cc SCP SCP Legacy PSTN SOHO network SG Cg Cb Ca ASS Cd VG Ce Hb TSS TSS Ca Ca Aa Ba MRF Cf Cf Ha HG/ NT DP Ad LT Ab LC Ac Ba Bb Bc TSR CSR CSR Ac Aa AG rAG Ac Ha DP Db Dc Da AR BR BR Customer Premise Network Access Network IPv6 based Internet GSC-8, OTTAWA Core Network

5. Soft switch Soft switch Gate Keeper TG/SG MAG TG PSTN/PLMN MAG MAG 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 Access QoS guaranteed VoP Premium IP Network Access IPv6 IPv6 Intranet based on MPLS Internet Access Other operator’s NGN GSC-8, OTTAWA

6. PSTN/PLMN WMAN HFC IM subsystem network (IPv6) 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 2G/3G all IP Cellular Best effort N/W 2W Loop/ xDSL WLAN Metro Ethernet VoP Premium IP network Converged IP Network GSC-8, OTTAWA

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 Backbone & convergence technology upgrade Fixed Circuit-packet TNM convergence Service enhancement Open architecture Broadcasting convergence interworking NGN Ubiquitous Multimedia Infrastructure Everything on IP Diffserv/QoS NGcN Optical Internet NGI Internet IPv6 interworking All IP High speed Portable Internet Mobile multimedia access & platform B3G Mobile Mobile current Step 2 Step 1 Step 3 GSC-8, OTTAWA

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 GSC-8, OTTAWA

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 GSC-8, OTTAWA