Tel) 3277-3506

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???? ???? ?? ? ?? -??? ????? ?? ????? ?? ??-

• ??????? ?????
• ???????
• ??? ???, ???, ???, ???
• Tel) 3277-3506
• E-mail)aroa_at_ewha.ac.kr

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• ???? ?? ? ??
• ???? ?? ??
• ??? ?? ? ????
• ?????? ???? ??
• ????? ?? ???? ??
• ???? ????
• ????

3
????? ?? ? ??

• ????? ?? ??? ?? ????? ??? ?? ??
• IMT-2000?? ??? ?? ??
• ??? ?? ???, ?? ??
• ?? ?? ??, ?? ?? ??? ???? ???? ???? ??

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???? ???? ?? ??
4? 5? 6? 7?
?? ??? ??? ?? ?? ??
IMT-2000?? ??? ??? ?? ??
??? ??? ??? ??
? ??? ???? ? ?? ??
?? ????? ??? ??? ?? ??
????? ?? ??? ?? ??
?? ????? ??? ??? ???? ???? ??
IMT-2000? ??? ???? ???? ?? (multimedia service)
??? ??? ???? ??? ?? ???? ??? ???
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??? ??

• ??? ??? ???? ? ???
• Path-loss
• Interference
• Subscribers population
• Required quality of service

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IMT-2000 ??? ??
7
? ??? Type Parameter
Cell type Mega cell Macro cell Micro cell Pico cell
Cell radius 100-500km 35km 1km 50m
Installation LEO/HEO/GSO (? ???? ??) Top of building/tower,etc. Lamp-post/building wall Inside building
Terminal speed 500 km/h 100 km/h 10km/h
Data rate 144 Kbps 384 Kbps 2 Mbps
Ref. ITU-R Recommendation M.1035
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???? ??? ??(macro/micro)
macrocell
microcell
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Hot spot? ??? ??? ??
Macro cell
Micro cell
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????(shared zone)? ??? ??
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??????

• ??? ?? ???? ???? ??? ??? ???? ???? ??? ??? ?????
  ?? ??
• ???? ?? ???? gt ?? ??? ?? ????
• ?????? ????? ?? ????? ?????, ?? ???? ??? ?? ?? ?
  ??

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???? ???? ????
?? ????
Low latency ??? ? ?? ???? ??
Scalability ??? ? ????? ?? ?? (PSTN, PDSN, Internet)
QoS guarantee ?? ???? QoS ??(???, ????? ??? new call blocking) ???? ?? ????? ???? ?? ????? ???? ??.
Low signaling traffic ???? ???? ??? ????? core?? ?? ?????? ?? ????
Minimal buffering ???? ??? ???? call ???? ??? ? ???? ????? trade-off ??
Registration Authentication ?? ??? ?? ??? ??? ?? ??? ??? ??
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????? ??

• ???(Soft) ????
• Inter-cell handover (within one cell)
• ???(Softer) ????
• Intra-cell handover (between cells in same cell
  layer)
• ??(Hard) ????
• Inter-layer handover
• Inter-network handover

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?????? ????

• ?? ???? ????
• ?? ???? ??? ??? ????
• ?? ???? ????
• ?? ???? ??? ?? ????
• ???? ????
• High mobility, low traffic rate? ????? ??
• ???? ???? ???
• Low mobility, high traffic rate? ????? ??
• ??? data rate? ???

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?? ????? ??? ??? ????
New Calls / Handover Calls from Macrocell
Macrocell
Low Speed High Data Rate / Underflow
High Speed Low Data Rate / Overflow
New Calls / Handover Calls from Microcell
Microcell
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?? ??? ?? ???? ??

• ???
• ???? ??? ??? ???
• ???? ?? ??? ??? ???
• ???? ???? QoS? ??? ???
• ????? ???? ??? ??? ???
• ???? ????
• Dropping probability
• Blocking probability

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???? Failure? ??? ?? ??

• Guard channel
• Handover call?? ?? ??? ?? ? ? ??? ???
• Handover call? failure? ????? guard channel?
  ????? new call? blocking ??? ????.
• Buffer
• ??? ?? ?? ?? call?? ?? ???? ?? scheme
• Call? ???? buffer? ?? ??, ?? ??? priority
  discipline? ????.

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Guard channel? Buffer? ??? System model
Handover call
New call
Cell
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???? Latency? ??? ?? ??

• ???(Shared Cell)? ??? ??

MSC
MSC
BTS
Shared Cell
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IMT-2000? ??? ???? ??

• 3G? 2G? ????
• 2G ?? ???? 3G ?? ??? ??
• 3G ?? 2G ?? ???? ? ?
• 3G(W-CDMA)? 3G(cdma2000)?? ????
• ?? ??? ?? ??? ???? ??

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????? ?? ???? ??

• ??? ????? ? ???
• ?? ???? ?? ??? ??? ??
• ???? ???? QoS? ??? ??
• ???? ???? ??? ??? ?? ??? ?? ?? ???? ??
• ??? ????? ???? ?? ???? ?? ??? ?? ??
• ?? ??? ???? High data rate? ???? call? ?? ???? ??

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???? ?? ??

• ?? ???? ???? ???? ??? ???? ???? ??
• ?? ??? ?? ??? ??
• ?????? ?? ?? ??

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Reference(1/2)

• Recommendation ITU-R M.1035
• ???, ???, CDMA ????
• ???,???,???,???,???? ?? ??? ??? ??? ?????? ??
  ???? ? ?? ?? ??, ????? ???
• Vijoy Pandey, Dipak Ghosal, Biswanath Mukherjee ,
  Performance Issues in Two-Tier Cellular
  Networks, Prceedings of the ICPWC99
• Giorgio Cimone, D.D.Weerakoon, A.H.Aghvami,
  Performance Evaluation of a Two Layer
  Hierarchical Cellular System with Variable
  Mobilily Users Using Multiple Class
  Applications, IEEE VTS 50th VTC 99
• Fumihide Kojima, Seiichi Sampei, Norhiko
  Morinaga, An Intelligent Radio Resource
  Management Scheme for Multi-layered Cellular
  System with Different Assigned Bandwidths under
  Nonuniform Traffic Conditions, Proceedings of
  the IEEE 1998 International Conference on
  Universal Personal Communications
• Yi-Bing Lin, Li-Fang Chang, Anthony Noerpel,
  Modeling Hierarchical Microcell/Macrocell PCS
  Architecture, IEEE 1995

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Reference(2/2)

• Kuen-Rong Lo, Chung-Ju Chang, Cooper Chang,
  C.Bernard Shung, A Combined Channel Assignment
  Mechanism for Hierarchical Cellular Systems,
  Computer Communications V.21 N.13 1998
• Cooper Chang, Chung-Ju Chang, Kuen-Rong Lo,
  Analysis of a Hierarchical Cellular System with
  Reneging and Dropping for Waiting New and Handoff
  Calls, IEEE Transactions on Vehicular Technology
  vol.48, no.4 1999