Professor Gil Nam, ChunJune 8, 2005

Ho June, Song

C D M A (IMT 2000)(For Scalable Telecommunication System)

Final Presentation

Background

Objective

Issues

Approach

Conclusion

Reference

Order of Contents

Introduction

Introduction

The number of global CDMA users : 240,000,000

The Korea subscribers : 36,440,000

The number of CDMA users

[The trend Mobile phone using in Korea]

0

10

20

30

40

50

60

70

1990 1992 1994 1996 1998 2000 2002

1996:KMTCsold to SKT

98:CommercialCDMA service start

00:IMT2000Licenses awarded

The number of GSM users in the world

The number of GSM users : 1,200 Million

Motivation

Compare CDMA and GSM

Note CDMA(Code Division Multiple Access)

GSM(Global System for Mobile Com.)

Region America, South-Korea, MongolEurope, South America..

Most country

Users rate(‘05) 20% 70%

Adopted year 1996 1989

3G CDMA-2000 W-CDMA

To investigate that engineers have done and should have to do for further scalability CDMA system in 3G

Objective

Implementation

- Is CDMA can be commercial technology?

Evolution

- CDMA can be integrated into new technology?

Scalability

- How can CDMA construct a scalable system provide

broad communication?

Reliability

- How can CDMA provide reliable service?

What’s the issues?

ScalabilityScalability

Case study CDMA deployment

Compare GSM deployment

Investigate what should do to come up with GSM in 3G

In 1993, TIA recognized CDMA as an IS-95 Standard

Korea government promote to commercialize the technology

in two parts

- ETRI and Qualcomm took charge of switch design, prototype

development and base transmit station

- Handset manufactures developed new mobile handsets

and switching system

SK telecom and Shinsegi roll out the first CDMA commercial

service in the world in 1996

Currently, CDMA is upgraded into CDMA 2000

Case study of CDMA deployment

The Multi-Channel Card in Base Stations can

make it possible to co-process signal

The Multi-Signal Process (1/2)

☆ 4channel process 4 signals at the same time

CH 1 CH 2

CH 3 CH 4

ControlUnit

[ 4 Channel ]

Expansion of Channel Card

ControlUnit

CH

[ 96 Channel ]

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The Multi-Signal Process (2/2)

Hand Off? Automatically convert one channel to another channel as user move to another place

Soft Send Off

Soft hand off means that terminals can communicate with several base stations at the same time.  

Cell ACell B

Cell ACell B

Cell A Cell B

[Soft Hand off Process]

Sector A

Sector B

Sector C

Communication link with the mobile station is maintained all the time

Large Scalable system

High quality service

High Security

Less power consume, small size enable

The strength of CDMA

Cellular technologies, 2004

GSM70%

CDMA15%

However,

CDMA is still secondly used in the world

GSM roaming region

60.9,

61%

13, 13%

26.1,

26%

CDMA 2000-1XCDMA IS-95CDMA 2000 EV-DO

CDMA development in Korea

20043.1 Mbit/sCDMA 2000 1x EV-DV

Jan 2002700Kbit/s - 2Mbit/sCDMA 2000 1x EV-DO

Oct 2000153-305Kbit/sCDMA 2000 1x

Jan 199613.5Kbit/sCDMA (IS-95)

Adopted in Korea

Speed

[2004]

What should CDMA do to be more scalable system like GSM?

GSM is used in 133 countries and on 347 networks

Most global system

Now, IMT 2000 sets global roaming system

To satisfy new trend CDMA accept new standard

CDMA-2000 should accept the standard of GSM to become more scrabble system

Adopt Handover requirement between GSM or other radio system is necessary

BS composition using CDMA

300 units of Base Station used in Seoul and Kyungi-do 1 Base Station used within 5km Base Station scheduled to automatically turn off per 2hours to maintain high communication quality

27,270KTF

27,105SKT

74,356Total

19,981LGT

Base Station Number

International roaming arrangements govern the subscriber’s ability to make and receive calls the home network’s coverage area. 

Network ability using GSM

Elements in inter-PLMN Handover

※ PLMN : Public Land Mobile Network, MSC : Mobile Switching Center HLR : Home Location Center

Requirement for Handover

Handover due to user equipment movement

- User equipment speeds stays within limits for given service

- User equipment stays constantly within UTRAN coverage

of a single UTRAN

Handover between radio access modes

- User equipment speeds stays within limits for given service

- User equipment stays constantly within UTRAN coverage

of a single UTRAN

※ UTRAN : Universal Mobile Telecommunication System Terrestrial Radio Access Network

Requirement for Handover from UTRAN to GERAN

Performance requirement

- Need detection time potential GERAN Handover Candidate

- Available number of GERAN Handover candidate to detect

- Probability for connection loss

Choose in two ways

- Drop all of packet data protocol contexts

- Choose one based upon criteria such as duration, amount of

traffic transferred

Requirements on multiple bearable services handover from UTRAN to GERAN

※ GRRAN : GSM radio access network

Consideration must be given to services that may involve the use

of multiple bearer services. For example Class A GPRS terminals

will be capable of simultaneously supporting more than one

data bearer services. Means shall be defined to allow

handover of several data bearer services from GERAN to UTRAN

Requirements handover from GERAN to UTRAN

Handover between Environments

Conclusion

Conclusion

CDMA has many advantages, but it is still second technology

CDMA System engineer should adopt to use global network

system broadly to become a major telecommunication

in 3G market

Adopting handover requirement of GSM and will be

beneficial lead CDMA to global telecommunication system

Conclusion

ITU, “Ubiqous Network Societies: The Case of The

Republic Korea”, April. 2005

IMT 2000 Handover requirements between GSM and other system

Jung-Uk, Won, “CDMA & Mobile Internet”, ETRI, 2004. 8

Dae-Sik, Kim, “Telecommunication from CDMA to 4G”

ETRI, April. 2005

Wi-Jin, Song, “The case of CDMA deployment”

KBS, “CDMA Development“, Http://www.kbs.co.kr/1tv/

sisa/sinwha/vod/1334570_1035.html

SK Telecomm “The Mobile Momentum” Http://www.momu.co.kr

Reference

Thank you!

Professor

And

Everyone

It was great honor for me to study with you