ZTE技能認證——GSM_P&O.rar (251.19 KB)【資料名稱】：中興考試認證資料GSM

【資料作者】：中興

【資料日期】：2010

【資料語言】：中文

【資料格式】：DOC

【資料目錄和簡介】：

1.(GSM規(guī)范中規(guī)定的（在無跳頻情況下），同頻干擾保護比C/I≥9dB，考慮到3dB的工程余量，工程中要求同頻干擾保護比C/I≥12dB，規(guī)范中規(guī)定鄰頻干擾保護比 C/I ≥－9dB，考慮到3dB的工程余量，工程中要求同頻干擾保護比C/I≥-6dB。
The GSM specifications define that (when frequency hopping is not available) the co-frequency interference protection ratio C/I≥9dB. Because 3dB engineering allowance is reserved, so the co-frequency interference protection ratio in the engineering should be C/I≥12dB. The specifications defines that the adjacent frequency interference protection ratio C/I ≥-9dB. Because 3dB engineering allowance is reserved, the adjacent frequency interference protection ratio in the engineering should be C/I≥-6dB.
2.G網(wǎng)網(wǎng)絡(luò)規(guī)劃的需要解決的是覆蓋、干擾、容量三大問題。聯(lián)通公司在頻率規(guī)劃中可用的頻點范圍為96～124。
Coverage, interference and capacity are the three major problems that should be solved during planning of G network. China Unicom can use the frequencies 96~124 during frequency planning.
3.GSM系統(tǒng)中，用戶通信占用的信道采用頻分復用（FDMA）和時分復用（TDMA）兩種方式。GSM頻段每200KHz分為一個小段，這也是GSM系統(tǒng)規(guī)定的載頻間隔，每一小段是一個頻道，在每個頻道中，采用時分復用，分成8個時隙。
In the GSM system, the channels occupied by user communication work in two modes: Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA). The GSM frequency band is segmented every 200KHz, which is also the interval of carrier frequency specified for the GSM system. Each segment is a channel. Each channel is divided into 8 timeslots through TDMA.