ngn deployment and its experience - itu: committed to ...€¦ · integrated ip network...

NGN Deployment and Its Experience

Hosong Lee

Manager / KT

ITU-T Workshop on Bridging the Standardization Gapand Interactive Training Session

(Nadi, Fiji, 4 – 6 July 2011 )

Nadi, Fiji, 4 – 6 July 2011

2

Agenda

Introduction

KT NGN Architectures

KT NGN Services

Considerations of NGN Deployment


3

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

0

5

10

15

20

25

30

35

40

Source: OECD

Other Fibre/LAN Cable DSL

OECD Fixed (wired) broadband subscriptions per 100 inhabitants, by technology, June 2010

OECD average


4

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)

FTTH(EPON)

2.6 million35%

FTTB(Active

Ethernet)2,4 million

32%

FTTPole(WDM-PON),

94k / 1%

Others71k / 1%

DSL2.3 million

31%

KT broadband subscribers(breakdown by technology)

Feb., 2011


0

1

2

3

4

5

0701

0702

0703

0704

0705

0706

0707

0708

0709

0710

0711

0712

0801

0802

0803

0804

0805

0806

0807

0808

0809

0810

0811

0812

0901

0902

0903

0904

0905

0906

0907

0908

0909

0910

0911

0912

1001

1002

1003

1004

1005

1006

1007

1008

1009

1010

1011

1012

Mill

ion

Number of Broadband subscribers (KT)

xDSL HFC Active Ethernet FTTH

7.4 million total (Dec., 2010)

(Source: Korea Communications Comission)2007

.01

2007

.12

2008

.12

2009

.12

2010

.12

2007

.06

2008

.06

2009

.06

2010

.06

Source : Korea Communications Comission

5

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

0

1,000,000

2,000,000

3,000,000

4,000,000

5,000,000

6,000,000

7,000,000

8,000,000

2006 2007 2008 2009 2010

IP convergence service users

VoIP

IPTV

Broadband

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

0

1,000,000

2,000,000

3,000,000

4,000,000

5,000,000

6,000,000

7,000,000

8,000,000

2006 2007 2008 2009 2010

Broadband users vs. Backbone traffic

← Broadband users

Backbone Traffic →

Gb/s


Subscribers

6

NGN concept

IP Network which can provide various emerging services including voice, data and multimedia services over a single network.


7

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 high-quality voice, video, broadcasting and the like.

Long-term cost-savings by introducing cost-effective hardware and developing in-house technological leverage


8

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 N/WControl N/WSoft SwitchSoft Switch

Transport N/WTransport N/W

Access N/WAccess N/W CoaxialxDSL, FTTx, Ethernet, WiFi

WiBro

Terminal LayerTerminal LayerPhoneTV/PC/VoIP Terminal

KORNET

WiBro Terminal

InternetPhoneVoIP

SwitchSwitchIMSIMS

IPTV TV Phone

IP Premium PSTNPSTN


9

Architecture of KT-NGN Backbone Network

Star topology with two distinct centers in Seoul

Center

Main Node

Regional Node

Access

KORNET

Center Center

Node Node

Redundancy

Domestic ISP IDC

Regional Node

Node

SER (Service Edge Router)

Center Center

Relay Relay

Premium Node

Relay

IP Premium N/W

Premium PE VPN-

PE

xDSLFTTx

Ethernet

TDM VPNADSL Metro for Corporate

PSTNGateway WiBro

PremiumGW

CRS

Full-Mesh

Global ISP


10

Architecture of KT Access Network

DSL demands are becoming saturated

Currently, FTTH has become a great part of KT access network

ATMADSL

NAS

DSLAM

NtopiaFES L3 S/W

SER(Service Edge Router)

SDHSDHMD

L3 S/WIP-xDSL

VDSL2 ONU

Aggregation S/W

FTTH-R

FTTH-E

OLT

MD

MD

ONT RNRN

RN

FES ONU

FTTH-V

Obsolete technologies to be replaced

xDSL

Premium

KORNET


11

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

MS

CORBA-IIOP

TGWNo.7

INAP

LE LE

Toll/TandemSSP

SCP

TDM

SGW

STPNo.7SIGTRAN

MEGACO

Videophone

SIP

AGW

SSW

SIP/SIP-T

NAT

0801588

1541

RGW

MEGACO

AS

SSW

SIP/MEGACO

MEGACO

Billing AAA.

FES

SSEMS

LDAP

Open API/SIP

IP Premium N/W

SIP/MEGACO

Service/application layerCall control signaling layerTransport layerBearer channelControl channel

VideophonePhone

IVRVideo Conf.

PresenceServerMMS/UMS

LocationServer

SIP

PhonePhone Phone

12

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.

IP PremiumBackbone

VDSL

FTTH

Ethernet

iCoD Server Farm

IPTV HeadEnd

STB

Channel(Multicast)

VoD(Unicast)

Access Network

STB

STB

Regional POP


13

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

MPLS VPN

IPSec PE IPSec PE

TDM PEMetro PE

IPSec CPE IPSec CPE

IPSec Tunnel

IPSec Tunnel

Metro Ethernet(802.1Q)

MPLS TDM

IPSec MPLS IPSec

xDSL xDSL


14

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.

Mobile data offloading through mobile Wi-Fi hotspots

egg : WiMAX-WiFi gateway

WiMAX as a Wi-Fi backhaul

WiMAX

MobileWi-Fi hotspot


15

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


16

NGN service requirements

Service Requirements for Each Service NetworkRequirements

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

• Survivability• QoS• MPLS/VPN• Multicast• IPv6• Service control• O&M• Security

IP-TV

• 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

MobileWiMAX

• IPv6 and Mobile IP • QoS and strengthened network security

VPN • MPLS VPN and end-to-end QoS• Reliability of VPN service

Nadi, Fiji, 4 – 6 July 2011*DTD : Dial Tone Delay

17

Service Classification

QoS profile for KT NGN

ClassCode Number

(IP ToS, MPLS EXP)Serve For Queuing Policy

GOLD

7 Reserved

Priority Queuing6

Routing protocol packetVoice traffic

SILVER5 Reserved 50% of remaining BW

RED (Random Early Detection) 4 IPTV-Multicast traffic

BRONZE3 IPTV-Unicast traffic 30% of remaining BW

RED (Random Early Detection)2 data traffic

BEST-EFFORT

1 Reserved 20% of remaining BWRED (Random Early Detection)0 Others


18

Considerations for Multicast

Multicast address allocation

For interoperable multicast channels, Should use ‘GLOP’ address(defined RFC 3180)

GLOP address space : 233/8

Example

KT KORNET ASN = 4766 = 00010010 1001111018 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.

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 |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


19

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


20

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


21

Question?

22

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