ITU-T Workshop on
Bridging the Standardization Gap
and Interactive Training Session
(Nadi, Fiji, 4 – 6 July 2011 )
NGN Deployment and Its Experience
Hosong Lee
Manager / KT
Nadi, Fiji, 4 – 6 July 2011
Agenda
Introduction
KT NGN Architectures
KT NGN Services
Considerations of NGN Deployment
Nadi, Fiji, 4 – 6 July 2011
2
Broadband status update : Korea
 Korea, “Broadband wonderland”
 34.4 broadband subscription per 100 inhabitants (OECD, June 2010)
 Household penetration exceeded 100% in late 2010 (17.2M subscribers / 17.1M households)
 55% of broadband users are enjoying super-speed FTTH or active Ethernet services
OECD Fixed (wired) broadband subscriptions per 100 inhabitants, by technology, June 2010
40
Other
Fibre/LAN
Cable
35
30
OECD average
25
20
15
10
5
0
Source: OECD
Nadi, Fiji, 4 – 6 July 2011
3
DSL
Broadband status update : KT
 In late 2010, FTTH became the major technology of KT’s broadband network
 DSL lines are being faded out, rapidly replaced by FTTH and FTTB
 FTTH for SFU(single family unit) area : IEEE 1G-EPON
 FTTB for MDU(multi dwelling unit) area : Active Ethernet
 100Mb/s service coverage : 90.1% (Estimated, Dec. 2010)
Million
Number of Broadband subscribers (KT)
KT broadband subscribers
(breakdown by technology)
5
xDSL
HFC
Active Ethernet
FTTH
4
FTTH
(EPON)
2.6 million
35%
DSL
2.3 million
31%
3
2
1
7.4 million total (Dec., 2010)
2007.01
0701
0702
0703
0704
0705
0706
2007.06
0707
0708
0709
0710
0711
0712
2007.12
0801
0802
0803
0804
0805
0806
2008.06
0807
0808
0809
0810
0811
0812
2008.12
0901
0902
0903
0904
0905
2009.06
0906
0907
0908
0909
0910
0911
0912
2009.12
1001
1002
1003
1004
1005
1006
2010.06
1007
1008
1009
1010
1011
1012
2010.12
0
(Source: Korea Communications Comission)
Source : Korea Communications Comission
Nadi, Fiji, 4 – 6 July 2011
4
Others
71k / 1%
FTTPole
(WDM-PON),
94k / 1%
FTTB
(Active
Ethernet)
2,4 million
32%
Feb., 2011
Traffic growth
 Backbone traffic has increased 3.3 times during the past 5 years
 For the same period, our broadband customers increased only by 16%
 Dilemma of a decoupling in revenue and traffic
 Spreads of new IP-based convergence services
 Customer bases of IPTV and VoIP are constantly growing
8,000,000
7,000,000
Broadband users vs. Backbone traffic
Gb/s
2,000
1,800
← Broadband users
1,600
6,000,000
1,400
5,000,000
Backbone Traffic →
4,000,000
1,000
4,000,000
400
1,000,000
200
0
0
2006
2007
Nadi, Fiji, 4 – 6 July 2011
2008
2009
2010
Broadband
6,000,000
5,000,000
600
2,000,000
7,000,000
1,200
800
3,000,000
8,000,000
IP convergence service users
 Subscribers
3,000,000
VoIP
2,000,000
IPTV
1,000,000
0
2006
5
2007
2008
2009
2010
NGN concept
 IP Network which can provide various emerging services including voice, data
and multimedia services over a single network.
Nadi, Fiji, 4 – 6 July 2011
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NGN goals
 New service infrastructure for more profit
 Integrated IP network architecture which will offer voice, data or multimedia
broadcasting over a single network
 From voice-oriented service to high-quality multimedia services including highquality voice, video, broadcasting and the like.
 Long-term cost-savings by introducing cost-effective hardware and developing
in-house technological leverage
Nadi, Fiji, 4 – 6 July 2011
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Architecture of KT-NGN
 Divided into the IP Premium network and the KORNET network
 IP Premium network is a new backbone network for KT NGN
 IP/MPLS, QoS(Diffserv), Multicast(PIM-SM), High-availability
Service
Service
Control
ControlN/W
N/W
Transport
TransportN/W
N/W
Access
AccessN/W
N/W
Terminal
TerminalLayer
Layer
Nadi, Fiji, 4 – 6 July 2011
IPTV TV
VoIP
Phone
IMS
Soft Switch
IP Premium
Phone
Switch
KORNET
xDSL, FTTx,
Ethernet, WiFi
WiBro
WiBro Terminal
Internet
TV/PC/VoIP Terminal
8
PSTN
Coaxial
Phone
Architecture of KT-NGN Backbone Network
 Star topology with two distinct centers in Seoul
Domestic ISP
IDC
Global ISP
Premium
GW
Full-Mesh
Center
CRS
Center
KORNET
Main Node
Node
Center
Center
IP Premium N/W
Redundancy
Node
Relay
Node
Premium
PE
Regional
Node
Regional Node
SER (Service
Edge Router)
Access
TDM
Nadi, Fiji, 4 – 6 July 2011
Center
ADSL
Metro for
Corporate
xDSL
FTTx
Ethernet
PSTN
Gateway
9
Relay
Premium
Node
WiBro
Relay
VPNPE
VPN
Architecture of KT Access Network
 DSL demands are becoming saturated
 Currently, FTTH has become a great part of KT access network
Obsolete technologies to be replaced
ATM
ADSL
DSLAM
SDH
SDH
KORNET
MD
NAS
xDSL
IP-xDSL
L3 S/W
MD
Aggregation
S/W
FES
Ntopia
L3 S/W
FTTH-R
RN
ONT
OLT
RN
FES ONU
FTTH-E
VDSL2 ONU
FTTH-V
RN
MD
Nadi, Fiji, 4 – 6 July 2011
10
SER
(Service Edge Router)
Premium
KT-NGN Service Architecture : Voice Call
 PSTN voice traffic is transferred over the NGN.
 VoIP service offers diverse value-added services including video telephony,
Internet fax and SMS
AS
Service/application layer
Call control signaling layer
MS
Bearer channel
Open API/SIP
Control channel
NAT
SSEMS
SSW
Billing
AAA.
OP
A-II
RB
CO
Phone
Videophone
SIGTRAN
SGW
IP Premium N/W
MEGACO
AGW
Phone
11
STP
No.7
Toll/Tandem
SSP
TDM
LE
LE
SIP
Videophone
No.7
ME
GA
CO
TGW
FES
RGW
SCP
SIP
INAP
SIP/SIP-T
MEGACO
SIP/MEGACO
LDA
P
SSW
1588
080 1541
IVR
Video
Conf.
SIP/
MEGACO
Transport layer
Presence Location
Server
Server
MMS/UMS
Phone
Phone
KT-NGN Service Architecture : IP-TV
 New service that merged the strengths of TV and high-speed internet
 Provide IP-TV services under the brand name of “Olleh TV”
 Live channels : 300+
 VoDs : 90,000+
 Interactivities : information, entertainment, T-Commerce etc.
Channel(Multicast)
VoD(Unicast)
iCoD Server Farm
Regional POP
IP Premium
Backbone
Access
Network
FTTH
VDSL
STB
STB
IPTV HeadEnd
Ethernet
Nadi, Fiji, 4 – 6 July 2011
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STB
KT-NGN Service Architecture : VPN
 Provide MPLS VPN and IPSec VPN services for enterprise
 In addition, Multicast VPN and L2VPN(VPLS, VPWS) services were added in 2009
Metro Ethernet
(802.1Q)
MPLS
TDM
TDM PE
Metro PE
MPLS VPN
IPSec PE
IPSec PE
IPSec Tunnel
IPSec Tunnel
xDSL
xDSL
IPSec CPE
IPSec CPE
IPSec
Nadi, Fiji, 4 – 6 July 2011
MPLS
13
IPSec
KT-NGN Service Architecture : Wibro
 Wibro service developed for high-speed mobile internet
 High-speed upload : average 1.2Mbps
 High-speed download : average 3Mbps
 Support various type of devices
 Laptop, USB Dongles, dedicated Wibro handsets etc.
WiMAX as a Wi-Fi backhaul
 Mobile data offloading
through mobile Wi-Fi hotspots
WiMAX
 egg : WiMAX-WiFi gateway
Mobile
Wi-Fi hotspot
Nadi, Fiji, 4 – 6 July 2011
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Considerations for NGN Backbone
 Guarantee of reliability and stability of existing services
 How to deploy NGN without legacy services interruption
 Meeting of new service requirements
 Mobile Internet, PSTN transformation, multimedia service
 Consideration of the future evolution
 Should be considered service and network development strategies
 CAPEX
 How to minimize the investment
 OPEX
 How to minimize complexities in operation and management
Nadi, Fiji, 4 – 6 July 2011
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NGN service requirements
Service
Voice
Service
•
•
•
•
Guarantee PSTN-level QoS (e.g., less than DTD 600ms)
PSTN-level reliability
Guarantee differentiated transport based on priority
Security on signaling traffic
•
•
Multicasting (real-time broadcasting traffic transport)
Real-time transport / differentiated transport based on
priority
Stability as a broadcasting station
Scalability to accommodate hundreds of channels
Mobile
WiMAX
•
•
IPv6 and Mobile IP
QoS and strengthened network security
VPN
•
•
MPLS VPN and end-to-end QoS
Reliability of VPN service
IP-TV
Network
Requirements
Requirements for Each Service
•
•
•
•
•
•
•
•
•
•
Survivability
QoS
MPLS/VPN
Multicast
IPv6
Service control
O&M
Security
*DTD : Dial Tone Delay
Nadi, Fiji, 4 – 6 July 2011
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Service Classification
 QoS profile for KT NGN
Class
Code Number
(IP ToS, MPLS EXP)
7
GOLD
SILVER
BRONZE
BESTEFFORT
Nadi, Fiji, 4 – 6 July 2011
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Serve For
Queuing Policy
Reserved
Routing protocol packet
Priority Queuing
Voice traffic
5
Reserved
4
IPTV-Multicast traffic
3
IPTV-Unicast traffic
2
data traffic
1
Reserved
0
Others
17
50% of remaining BW
RED (Random Early Detection)
30% of remaining BW
RED (Random Early Detection)
20% of remaining BW
RED (Random Early Detection)
Considerations for Multicast
 Multicast address allocation
 For interoperable multicast channels, Should use ‘GLOP’ address(defined RFC 3180)
 GLOP address space : 233/8
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
233
|
16 bits AS
| local bits
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 Example
 KT KORNET ASN = 4766 = 00010010 10011110
18
158
 233.18.158.0/24
 Multicast high-availability
 Static Join
 Static IGMP Join on the edge routers
 Provide a sub-second channel zapping time
 Fast Convergence
 deploy IGP fast convergence for Multicast fast convergence
 Tuning various timer settings : Carrier-delay, LSA delay, SPF delay, Mcast RPF update timer etc.
Nadi, Fiji, 4 – 6 July 2011
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Considerations for Multicast(con’t)
 Multicast security
 Group range filtering : filtering improper multicast group except approved GLOP addr.
 PIM register filtering : only approved source can register to RP
 MSDP SA filtering : limitation for SA information
 Multicast Route limit : limitation of maximum multicast route entry
 BSR message filtering
 Optimal RP positioning
 In KT practice , RP == HE Router
 RP redundancy
 Dynamic RP vs. Anycast RP
 Multicast traffic load balancing issue
 Based on source IP and Multicast group address
Nadi, Fiji, 4 – 6 July 2011
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Other considerations
 Routing policy
 Consider routing policy to maximize the operational convenience
 BGP(Route Reflector), IGP(OSPF), MPLS(LDP)
 Service migration to NGN
 How to transform PSTN to NGN without any interruption
 Network scalability/stability
 How to eliminate single point of failure
 How to deploy fast convergence to minimize routing failure time
 Operation
 Standardization of operating process
 Extensive training and education programs
 Troubleshooting guidelines
 Security
 How to prevent massive malicious traffic attacks
Nadi, Fiji, 4 – 6 July 2011
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Question?
21
Thank You
E-mail hosonglee@kt.com
Fixed +82-42-870-8607
Mobile +82-10-7345-0580
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