3g通訊的發(fā)展與應(yīng)用趨勢(shì)技術(shù)篇(英文版)(編輯修改稿)
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【文章內(nèi)容簡(jiǎn)介】 erent cell types and understand why and when each would be used.208。 Name the concept of frequency reuse.208。 Understand the Characteristic of radio municationOn pletion of this section will be able to:The Division Of Radio FrequencyDifferent frequency has different propagation characteristicsThe Division Of Radio Frequency3003000GHzEHFExtremely HighFrequency30300GHzSHFSuper High Frequency330GHzUHFUltra High Frequency3003000MHzVHFVery High Frequency30300MHzHFHigh Frequency330MHzMFMedium Frequency3003000KHzLFLow Frequency30300KHzVLFVerylow Frequency330KHzVFVoice Frequency3003000HzELFExtremely LowFrequency30300Hz330HzDesignationClassificationFrequencyIMT2023 Frequency Assignment1850 1900 1950 2023 2050 2100 2150 2200 2250ITUEuropeUSA MSSPCSA D B BC D CEF A FE MSSReserveBroadcastauxiliary2165 MHz1990 MHz1850 1900 1950 2023 2050 2100 2150 220022501880 MHz 1980 MHzUMTSGSM 1800 DECT MSS1885 MHz 2025 MHz2023 MHzIMT 2023MSSUMTSJapan MSSIMT 2023MSSIMT 2023PHS1895 1918BC1885A A’2170 MHzIMT 20232110 MHz 2170 MHzMSS MSSCDMATDDWLLFDDWLL19802025MHzGSM1800 CDMAFDDWLL19601920 1945Chinacellular(1) cellular(2) cellular(2)1805 MHz186518651870 188518901895 1910 1930 1945 196519701975The Frequency SpectrumTACS/GSMSeparation 45MHzChannel Bandwidth: 200KHzETACS/EGSM872 890 905 915 917 935 950 960MHzTACS/GSM GSMETACS/ EGSMTACS/GSM GSMThe Frequency SpectrumSeparation: 95MHzChannel Bandwidth: 200KHzBase Station Receive 1710 1785 1805 1880MHzBase Station TransmitDCS 1800The Frequency SpectrumCDMA450MHz800MHz1900MHz2100MHzSeparation increasesService AreaPLMN service area......System areaPLMN service areaMSC area...Location area...Base station area...Radio cell...... ......MSC area...Location area...Base station area...Radio cellCELLOmni1120degree123OmniDirectional Cells120 Degree SectorsFrequency ReUse4(Site)X 3(Cell) Reuse519 61027311591102128411739516Illustration of 4*3 Frequency Reuse 1 2 3 4 5 6 7 8 9 10 11 12 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
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