Lab 1: Radio Base Station and Antenna Setup in mobile phones
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Transcript Lab 1: Radio Base Station and Antenna Setup in mobile phones
LAB 4. Base Station
Goal
透過觀察BTS與天線,以瞭解GSM基地
台的運作
Base Station
Antenna
How do you know it is an antenna?
實驗設備與材料
70803基地收發台。
準備照像機進行記錄。
實驗步驟
到70803觀察基地收發台
觀察基地收發台內的各個模組
是否所有的模組都在使用中
觀察在7館屋頂上的基地台
觀察天線的外觀
觀察佈線的狀況
GSM BTS (in YZU 70803)
Radio Base Station
基地收發台BTS是GSM與MS 之間的溝通
管道。Ericsson稱BTS為RBS。
BTS包括發射器、接受器(天線)、與手機
通訊的無線介面相關之信令號處理的設
備。
MS
BSS
RBS
BSC
Goad of RBS Management
Radio Resource Management
Radio Frequency Measurement
Efficient Spectrum Use
Frequency hopping
Discontinuous Transmission (DTX)
Dynamic Power Regulation
Radio Resource Management
BTS會收集所有MS送來的 signal 測量數
據,轉交給 BSC。BSC 利用這些數據做
channel assignment,一個低干擾的
channel就被稱為是 idle channel,可以
分配給MS使用。
Radio Base Station
To BSC
Antenna
TRU
DXU
CDU
TRU
Main
supply
ECU
PSU
DXU: Distribution Switch Unit
TRU: Transceiver Unit
CDU: Combining and Distribution Unit
ECU: Energy Control Unit
PSU: Power Supply Units
Battery
supply
Parts of RBS (1/3)
TRU: Transceiver Unit
One TRU handles 8 air time slots
Perform Channel Coding, Interleaving,
Ciphering, Equalization
CDU: Combining and Distribution Unit
負責將各個TRU要傳送的transmitted signals
合併送到antenna。
將uplink的signal分配給各個TRU。
Parts of RBS (2/3)
DXU: Distribution Switch Unit
Interface to the BSC (A-bis interface)
Cross connect individual time slots to TRU
Provide RBS synchronization timing
reference (i.e. clock source)
ECU:
監控power的相關設備
使用空調調節RBS機櫃的狀況
Parts of RBS (3/3)
PSU: Power Supply Units
Provide DC voltage based on AC or DC
power supply
Battery Fuse Unit can give a minimum
of 1 hour battery back-up
Antenna on Building 7 (1/2)
2G and 3G antenna
Antenna on Building 7 (2/2)
DCS 1800
directional
antenna
DCS 1800
directional
antenna
3G antenna
2G/3G BTS on Building 7
實驗報告
說明GSM基地收發台的功能。
找出7館的基地台,並說明GSM基地收發
台與天線間的連線狀況。
說明基地台的各種外觀。