3G yog lub cim thib peb ntawm wireless thev naus laus zis. Nws los nrog kev txhim kho dua li yav dhau los wireless thev naus laus zis, xws li kev sib kis ceev ceev, kev nkag mus rau multimedia siab, thiab thoob ntiaj teb roaming.
3G feem ntau yog siv nrog cov xov tooj ntawm tes thiab tes ua ib txoj hauv kev los txuas lub xov tooj mus rau Is Taws Nem lossis lwm tus IP tes hauj lwm txhawm rau ua suab thiab video hu, rub tawm thiab xa cov ntaub ntawv, thiab dhia hauv Web.
Tus qauv 3G tau hloov pauv los ntawm 4G tus qauv, uas nws tus kheej tau ploj mus los ntawm 5G cov kev pabcuam.
History of 3G
3G ua raws li tus qauv ntawm G's uas ITU tau pib thaum ntxov 1990s. Tus qauv yog ib qho kev pib wireless hu ua International Mobile Communications 2000. 3G, yog li ntawd, tsuas yog tom qab 2G thiab 2.5G, cov thev naus laus zis thib ob.
2G thev naus laus zis suav nrog, ntawm lwm tus, Lub Ntiaj Teb Txheej Txheem rau Txawb. 2.5G coj cov qauv uas nyob nruab nrab ntawm 2G thiab 3G, suav nrog General Packet Radio Service, Enhanced Data rates for GSM Evolution, Universal Mobile Telecommunications System, thiab lwm yam.
3G zoo dua li cas?
3G muab ntau yam kev txhim kho dua 2.5G thiab cov tes hauj lwm yav dhau los:
- Ntau zaus dua cov ntaub ntawv ceev
- Txhim kho suab thiab video streaming
- Videoconferencing txhawb nqa
- Web thiab WAP browsing ntawm qhov nrawm dua
- IPTV (TV hauv internet) txhawb
Technical Specifications
Tus nqi hloov pauv rau 3G tes hauj lwm yog nyob nruab nrab ntawm 128 thiab 144 kilobits ib ob rau cov khoom siv uas txav nrawm, thiab 384 kbps rau cov qeeb qeeb - zoo li cov neeg taug kev taug kev. Rau kev ruaj ntseg LANs, qhov ceev mus dhau 2 Mbps.
3G suav nrog cov qauv xws li W-CDMA, WLAN, thiab xov tooj cua ntawm tes, thiab lwm yam.
Yuav tsum tau siv
Tsis zoo li Wi-Fi, uas koj tuaj yeem tau txais dawb hauv hotspots, koj yuav tsum tau sau npe rau tus muab kev pabcuam kom tau txais 3G network txuas. Cov kev pabcuam no feem ntau hu ua cov phiaj xwm ntaub ntawv lossis phiaj xwm network.
Koj lub cuab yeej txuas nrog 3G network los ntawm nws daim npav SIM (hauv lub xov tooj ntawm tes) lossis nws daim npav 3G cov ntaub ntawv (uas tuaj yeem muaj ntau hom, xws li USB, PCMCIA, thiab lwm yam), ob qho tib si. feem ntau yog muab lossis muag los ntawm tus muab kev pabcuam.
Cov ntawv teev lus no yog li cas lub cuab yeej txuas rau Is Taws Nem thaum nws nyob hauv thaj tsam ntawm lub network. Qhov tseeb, cov cuab yeej rov qab siv tau nrog cov thev naus laus zis qub, uas yog vim li cas 3G tau tshaj xov tooj tuaj yeem tau txais kev pabcuam 2G yog tias nws muaj thaum tsis muaj kev pabcuam 3G.
Lub 3G craze ntawm thaum ntxov 2010s tau rov qab; feem ntau cov khoom siv tam sim no txhawb nqa 4G tus qauv, siv 3G ua qhov poob qis yog tias tsis muaj kev sib txuas 4G. Hauv qee qhov chaw ntawm lub ntiaj teb, tshwj xeeb tshaj yog nyob rau hauv cov cheeb tsam nyob deb nroog, 3G tseem yog lub hauv paus kev pabcuam.
