professor gil nam, chun june 8, 2005
TRANSCRIPT
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Professor Gil Nam, ChunJune 8, 2005
Ho June, Song
C D M A (IMT 2000)(For Scalable Telecommunication System)
Final Presentation
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Background
Objective
Issues
Approach
Conclusion
Reference
Order of Contents
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Introduction
Introduction
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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]
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1990 1992 1994 1996 1998 2000 2002
1996:KMTCsold to SKT
98:CommercialCDMA service start
00:IMT2000Licenses awarded
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The number of GSM users in the world
The number of GSM users : 1,200 Million
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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
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To investigate that engineers have done and should have to do for further scalability CDMA system in 3G
Objective
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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?
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ScalabilityScalability
Case study CDMA deployment
Compare GSM deployment
Investigate what should do to come up with GSM in 3G
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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
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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
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CH 1 CH 2
CH 3 CH 4
ControlUnit
[ 4 Channel ]
Expansion of Channel Card
ControlUnit
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[ 96 Channel ]
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The Multi-Signal Process (2/2)
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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
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Large Scalable system
High quality service
High Security
Less power consume, small size enable
The strength of CDMA
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Cellular technologies, 2004
GSM70%
CDMA15%
However,
CDMA is still secondly used in the world
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GSM roaming region
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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]
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What should CDMA do to be more scalable system like GSM?
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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
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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
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International roaming arrangements govern the subscriber’s ability to make and receive calls the home network’s coverage area.
Network ability using GSM
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Elements in inter-PLMN Handover
※ PLMN : Public Land Mobile Network, MSC : Mobile Switching Center HLR : Home Location Center
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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
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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
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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
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Conclusion
Conclusion
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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
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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
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Thank you!
Professor
And
Everyone
It was great honor for me to study with you