Huawei Gsm Bts3900a Auxiliary Equipment-20080730-B-Issue1[1].0
DXU GSM Equipment
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Transcript of DXU GSM Equipment
1
GSM equipment
2
Reference
• Ericsson GSM RBS 2000 Basics (student Text EN/LZT 123 3805 R2A)
• 遠傳電訊教育中心 GSM Basic Training Material, http://www.fetec.org.tw
3
GSM System StructureSS
BSSMS OMC
BSCRBS
AUC
HLREIR
ILR
GMSC
DTI MSC/VLR
PSTNPSTN
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Radio Base Station
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Radio Base Station
TRU CDU
Antenna
ECU PSU
TRU
Main supply
Battery supply
To BSC
DXU
• DXU: Distribution Switch Unit• TRU:Transceiver Unit• CDU:Combining and Distribution Unit• ECU: Energy Control Unit• PSU: Power Supply Units
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TRU:Transceiver Unit
• One TRU handle 8 air time slots• Perform Channel Coding,
Interleaving, Ciphering, Equalization• One transmit output, two receive
inlets
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Transmission between RBS & BSC
• Enhancement of transmission network
B SC
R B S
BSC
RBS
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Transmission between RBS & BSC
• Building access network is expensive• Chain and Tree structures Vs. Ring and Mesh
BSC
RBS
Ring
BSC
RBS
Protection
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Antenna
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Omni-directional Antenna
GSM 900
GSM 1800
Lightning conductor
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Directional Antenna
GSM 900
GSM 1800
Lightningconductor
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Directional Antenna
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Antenna Diversity• Two independent
antennas receive the same signal
• Space Diversity: Two antennas are separated in a certain physical distance
• Polarization Diversity: Two different polarization arrays in an antenna unit
Horizational array
Verticalarray
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Indoor Leakage Coaxial Cable
Leakage coaxial cable
15
Indoor antenna
Omni-directional antennaDirectional patch antenna