Lab 1: Radio Base Station and Antenna Setup in mobile phones

Report
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。

similar documents