selected topic6
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mobileTRANSCRIPT
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1 Selected Topics in Telecommunication Engineering I
504460
5 2558 .
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Wireless Communication
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() (The cellular
concept and frequency planning )
: (Mobile radio propagation I: Large scale path loss )
: (Mobile radio propagation II: Multipath and small scale fading )
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() (Modulation
techniques for mobile communications)
(Channel coding for Wireless communications)
(Introduction to Wireless networking)
(Introduction to some wireless communications standards)
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()
path loss feding Grade of Service (GoS)
AMPS GSM GPRS
WCDMA
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Path loss model (Hata model)
!!
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Path loss model Okumura/Hata
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Path loss model Okumura/Hata
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Path loss model Cost 231
!!!!
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Cost 231 ()
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Cost 231 ()
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Cost 231 ()
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Cost 231 ()
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Cost 231 ()
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1
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1 ()
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1 ()
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1 ()
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1 ()
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1 ()
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Grade of Service (GoS)
Erlang B Erlang C
nonblocking
blocking
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3
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3 Erlang
Erlang traffic intensity (60) () () =
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= x = 4.9 H
3 ()
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0.0552
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4a
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4b
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395 7 1 calls
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395 7 1 calls
395/7 57 1 Erlangs (m = 57) 1% (0.01)
5 ()
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(m = 57)
(A = 44.2)
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#x2# 2 44.2
calls 1 44.2 x 30 = 1326 calls
5 ()
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1G 2G 3G AMPS
GSM
GPRS
EDGE
WCDMA49
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AMPS GSM GPRS WCDMA AMPS
AMPS 1G AT&T 824 894 (MHz)
AMPS
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AMPS GSM GPRS WCDMA () GSM
GSM AMPS GSM TDMA GSM 2G
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AMPS GSM GPRS WCDMA () GPRS
GPRS 2.5G GPRS 9.6 170 (kbps) GPRS TDMA
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AMPS GSM GPRS WCDMA () EDGE (Enhance Data Rate for GSM Evolution)
EDGE (Enhanced Data rates for GSM Evolution) 3GPP (3rd Generation Partnership Project) GPRS EGPRS (Enhanced General Packet Radio Service) 2.75G
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AMPS GSM GPRS WCDMA () WCDMA
WCDMA GSM CDMA TDMA WCDMA GSM WCDMA 3 WCDMA 2
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