???????LTE FDD??

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??????????????3G???????????2009??1?￡??й?3G??????????????????????????????????3G??????ɡ??????????????????????????5??——?????????????????????????????????????????????????й????????????TD-SCDMA?????????????3G?????????2009??????????????

????????????????????????????????й?????е????????“????”3G????????Σ?????λС????й???????й???????????????????????WCDMA??CDMA2000?????

????????????????????TD-SCDMA??????????????????????????????????????????????????????????3G???????????????“?????”????——?й??????38.2%?????й??????44%??3G??????????????й??????18.63%????

?????????й???????????????TD-LTE??4G???????鲿??????????????????????3G??????????????????????λ????????????????????????????????3G?????????????????TD-SCDMA?????????仰??????????????“???”?????????????????????κμ???????????????????????????3G?????????????4G??????????????????3G???????????

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????????в????????????4G???TD-LTE??LTE FDD????????????????3G?????С???????????????????????????????????????????????????????

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?????????????4G??????????????????TD-LTE??????????????????????????п????????????????????????????4G??????LTE FDD?????????????????????ζ????????????????TD-LTE?????

????4G??3G???λ????

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???????????3G??????????HSDPA+??????42Mbps???????ó????14.4Mbps??????3???????й??????4G??????????????????·????????????????30Mbps~60Mbps????????????????3G????????????????????HSPA+???????????????????????????4G???ó??????????????????LTE FDD??????????????е?3G?????????4G????????????????????????????????3G???????????????????TD-LTE?????λ????????

????????й??????????CDMA??3G???????????????WCDMA?????????????????????3G????????в?????????????????????????????????3G????硢????????????????·??????Ч?????????4G???????????????????????????????????????????????????

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????????????μ??????????????????TD-LTE??LTE FDD????????????????????3G?????????????????С???????????????????????????????????

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