management frekuensi
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Management Management FrekuensiFrekuensi
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Spesifikasi Frekuensi GSMSpesifikasi Frekuensi GSM
• Band Frekuensi : uplink (890 MHz - 915 MH downlink (935 MHz - 960 MHz)
• Duplex Spacing : 45 MHz• Carrier Spacing : 200 MHz• Modulasi : GMSK• Transmission Rate : 270 Kbps• Metode Akses : FDMA - TDMA• Basic Duplexing: FDD• Speech Coder : RPE LPC 13 Kbps• Diversity :
• Channel Coding• Interleaving• Frequencies Hoping• Adaptive Equalization
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Alokasi FrekuensiAlokasi Frekuensi
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Alokasi Kanal Frekuensi GSMAlokasi Kanal Frekuensi GSM
001 002 122 123 124
890,2 890,4 914,6 914,8 915
001 002 122 123 124
935,2 935,4 959,6 959,8 960
BSS RECEIVER
(Up-Link)
BSS Transmitter
(Downlink-Link)
45 MHz
ChannelNumber
Frequency
ChannelNumber
Frequency
25 MHz
MHz
MHz
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Alokasi Kanal Operator GSM di IndonesiaAlokasi Kanal Operator GSM di Indonesia
Operator Frekuensi (MHz) No. Kanal
• Satelindo 890.0 - 900.0 1 - 50
• Telkomsel 900.0 - 907.5 51 - 87
• Excelkomindo 907.5 - 915.0 88 - 124
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Konsep Kanal GSMKonsep Kanal GSM
Kanal = Channel = TRX = RF-Carrier = 1 Frame TDMA
Kanal Fisik (Phisycal Channel)– 1 ts dari Frame merupakan satu Kanal Fisik– Dalam 1 Channel terdapat 8 kanal fisik (ts 0-7)
Kanal Logical (Phisycal Channel)– berisi informasi anntara MS dan BS– Jenis Informasi yaitu user Data dan Control Signalling– Kanal ini ditumpangkan pada kanal fisik
1 2 3 4 5 6 70
1 Frame
1 time slot (ts)
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Frequency ReuseFrequency Reuse
• DefinisiDefinisi– Pemakaian frekuensi yang sama secara
berulang di lokasi yang berbeda
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Latar Belakang Frekuensi ReuseLatar Belakang Frekuensi Reuse
• Keterbatasan Alokasi Frekuensi• Keterbatasan Area Cakupan Cell• Menaikkan Jumlah Pembicaraan• Membentuk Cluster yang berisi beberapa cell• Co-Channel Interferensi
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Cell Reuse PatternCell Reuse Pattern
3 Site Cluster 4 Site Cluster 7 Site Cluster
3/9 Site Cluster 4/12 site cluster 7/21 site cluster
BS
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Reuse DistanceReuse Distance
Frekuensi Sets:
A, B, C…..G
G B
F
E D
A
A
A
A
A
A
A
Diameter Cell
C
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Co-Channel InterferenceCo-Channel Interference
4 1
3
1 4
2 3
1Interference P
ath
Pengelompokan Kanal Frekuensi
1=51,63
2=55,60
3=72,62
4=57,76
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Adjacent Channel InterferenceAdjacent Channel Interference
4 1
3
1 4
2 3
1
Pengelompokan Kanal Frekuensi
1=51,63
2=55,60
3=72,62
4=57,76
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Inter System InterferenceInter System Interference
Pemancar Lain di luar GSM yang menggunakan rekuensimendekati frekuensi dari BS di Cell A, sehingga mempengaruhi kualitas suara.
Pemancar Lain
Cell A
Cell B
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Mengurangi CO-CHANNEL InterferensiMengurangi CO-CHANNEL Interferensi
• Menggunakan Antena Directional (Sectorized Cell)
• Menerapkan Downtilting Antena• Menerapkan Power Control• Menggunakan Umbrella Pattern Antena (Biasanya
pada penggunaan Mikrosel)
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DownTiltingDownTilting
• Mengurangi Coverage Cell• Efektif untuk high traffic (perkotaan)
Normal
Downtilting
Vertical Antena