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。