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




               Professor Gil Nam, Chun
                     June 8, 2005
                    Ho June, Song
 Order of Contents

 Background
 Objective
 Issues
 Approach
 Conclusion
 Reference
Introduction
Introduction
   The number of CDMA users

 The number of global CDMA users : 240,000,000
 The Korea subscribers : 36,440,000
  70
  60                      00:IMT2000
                      Licenses awarded
  50
  40
                  98:Commercial
  30             CDMA service start

  20            1996:KMTC
                sold to SKT
  10
   0
    1990   1992    1994   1996    1998    2000     2002
              [The trend Mobile phone using in Korea]
The number of GSM users in the world




 The number of GSM users : 1,200 Million
 Motivation
 Compare CDMA and GSM

                          CDMA                            GSM
  Note
             (Code Division Multiple Access) (Global System for Mobile Com.)

Adopted
                          1996                            1989
  year


Users rate
                          20%                             70%
  (‘05)


                                                Europe, South America..
 Region      America, South-Korea, Mongol
                                                     Most country


   3G                 CDMA-2000                        W-CDMA
 Objective


To investigate that engineers have done
and should have to do for further scalability
CDMA system in 3G
 What’s the issues?


 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?
Scalability
Scalability
 Case study CDMA deployment

 Compare GSM deployment

 Investigate what should do to come up with GSM in 3G
  Case study of CDMA deployment

 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
  The Multi-Signal Process (1/2)
 The Multi-Channel Card in Base Stations can
  make it possible to co-process signal




   ☆ 4channel process 4 signals at the same time
  The Multi-Signal Process (2/2)

Expansion of Channel Card

    CH CH CH CH    CH CH CH CH

    CH CH CH CH 1 CH CH CH 2 CH
              CH         CH

    CH CH CH CH    CH CH CH CH           Control
                                          Unit
    CH CH CH CH CH CH CH CH
            CH 3     CH 4                    Control
    CH CH CH CH CH CH CH CH                   Unit

    CH CH CH CH    CH CH 4CH CH ]
                       [ Channel
    CH CH CH CH    CH CH CH CH

    CH CH CH CH    CH CH CH CH

                            [ 96 Channel ]
   Soft Send Off
 Hand Off? Automatically convert one channel
  to another channel as user move to another place



 Cell A                     Cell A
           Cell B                       Cell B
                                                               Sector B

                                                  Sector A
               Cell A       Cell B
                                                             Sector C


          [Soft Hand off Process]

 Communication link with the mobile station is maintained all the time

 Soft hand off means that terminals can communicate
  with several base stations at the same time.
  The strength of CDMA

 Large Scalable system
 High quality service
 High Security
 Less power consume, small size enable
However,

  Cellular technologies, 2004



         CDMA
          15%




                                GSM
                                70%
  CDMA is still secondly used in the world
 GSM roaming region
CDMA development in Korea




   13, 13%                                                      Adopted
                                                Speed
                                                                in Korea
                        CDMA (IS-95)          13.5Kbit/s        Jan 1996
26.1,        60.9,
26%          61%       CDMA 2000 1x         153-305Kbit/s       Oct 2000

                     CDMA 2000 1x EV-DO   700Kbit/s - 2Mbit/s   Jan 2002

                     CDMA 2000 1x EV-DV       3.1 Mbit/s          2004

        [2004]
         CDMA 2000-1X
         CDMA IS-95
         CDMA 2000 EV-DO
 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

                            Base Station Number
                         SKT          27,105
                         KTF          27,270
                         LGT          19,981
                        Total         74,356
  Network ability using GSM
 International roaming arrangements govern the subscriber’s
   ability to make and receive calls the home network’s coverage
   area.
  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

 Requirements on multiple bearable services
  handover from UTRAN to GERAN
   Choose in two ways
    - Drop all of packet data protocol contexts
    - Choose one based upon criteria such as duration, amount of
     traffic transferred

 ※ GRRAN : GSM radio access network
 Requirements handover from GERAN to UTRAN
  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


 Handover between Environments
Conclusion
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
  Reference

 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
              Thank you!
                Professor
                  And
               Everyone

It was great honor for me to study with you

				
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