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

【資料作者】：中興

【資料日期】：2010

【資料語(yǔ)言】：中文

【資料格式】：DOC

【資料目錄和簡(jiǎn)介】：

1.(GSM規(guī)范中規(guī)定的（在無(wú)跳頻情況下），同頻干擾保護(hù)比C/I≥9dB，考慮到3dB的工程余量，工程中要求同頻干擾保護(hù)比C/I≥12dB，規(guī)范中規(guī)定鄰頻干擾保護(hù)比 C/I ≥－9dB，考慮到3dB的工程余量，工程中要求同頻干擾保護(hù)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(wèn)題。聯(lián)通公司在頻率規(guī)劃中可用的頻點(diǎn)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(fù)用（FDMA）和時(shí)分復(fù)用（TDMA）兩種方式。GSM頻段每200KHz分為一個(gè)小段，這也是GSM系統(tǒng)規(guī)定的載頻間隔，每一小段是一個(gè)頻道，在每個(gè)頻道中，采用時(shí)分復(fù)用，分成8個(gè)時(shí)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.