Cov Kev Qhia Kom Paub Ntxiv ntawm 3G
3G yog peb lub cim ntawm wireless technologies. Nws tuaj yeem tsim kho kom zoo dua qub dhau wireless technologies, xws li kev sib kis ceev, kev siv xovtooj zoo siab, thiab thoob ntiaj teb kev khiav haujlwm.
3G feem ntau siv nrog cov xov tooj ntawm tes thiab cov handsets ua ib qho txhais tau tias yog txuas xov tooj mus rau internet los yog lwm tus IP networks thiaj li ua lub suab thiab video hu, mus download tau thiab muab cov ntaub ntawv xa tawm, thiab mus saib cov Web site.
Keeb Kwm
3G ua raws li tus qauv ntawm G's tias ITU pib nyob rau hauv thaum ntxov 1990s. Cov qauv no yog ib qho lag luam hu ua IMT-2000 (International Mobile Communications 2000). 3G, yog li ntawd, los tom qab 2G thiab 2.5 G , tiam ob tiam neeg.
2G technologies xws li, nrog lwm tus, lub ntiaj teb no System for Mobile ( GSM ). 2.5G coj cov qauv uas yog nruab nrab ntawm 2G thiab 3G, nrog rau General Packet Xov tooj cua Service ( GPRS ), Cov Ntawv Txhawb Kev Tshaj Tawm rau GSM Evolution ( EDGE ), Universal Mobile Telecommunications System (UMTS), thiab lwm tus.
3G Zoo Li Cas?
3G muaj cov kev tshaj li nram qab no dhau 2.5G thiab cov tes hauj lwm yav dhau los:
- Ntau zaus ntau dua cov ntaub ntawv ceev.
- Enhanced suab thiab video streaming.
- Videoconferencing yug.
- Web thiab WAP ntawm kev nce siab dua.
- IPTV (TV hauv internet) txhawb nqa.
Technical Specifications
Kev hloov tus nqi rau 3G networks yog nruab nrab ntawm 128 thiab 144 kbps (kilobits ib pliag) rau cov cuab yeej yoo mov, thiab 384 kbps rau cov qeeb qeeb (nyiam cov neeg taug kev). Rau wireless wireless LANs , tus nqi hla dhau 2 Mbps (2,000 kbps).
3G yog ib txheej ntawm cov technologies thiab cov qauv qhia ntawv muaj xws li W-CDMA, WLAN, thiab cov xov tooj ntawm tes, thiab lwm cov.
Yuav tsum tau siv
Ib tug ntaus ntawv uas yog 3G tshaj, zoo li ib lub xov tooj los yog ntsiav tshuaj, yog, ntawm chav kawm, thawj qhov yuav tsum tau ua. Qhov no yog qhov twg lub npe "3G xov tooj" los ntawm-lub xov tooj uas muaj 3G functionality. Lub sij hawm tsis muaj dab tsi ua nrog rau cov koob yees duab los yog lub cim xeeb nws muaj. Ib qho piv txwv yog iPhone 3G.
3G tes feem ntau muaj ob lub koob yees duab txij thaum lub tshuab tso cai rau tus neeg siv kom muaj kev hu xov tooj, uas yog ib qho uas siv neeg siv lub koob yees duab los kuj xav tau.
Tsis zoo li Wi-nkaus , uas koj tuaj yeem tau txais dawb hauv cov hotspots , koj yuav tsum tau cuv npe mus rau ib qhov chaw pabcuam kom tau 3G txuas network. Hom kev pab no feem ntau hu ua cov phiaj xwm tswv yim lossis phiaj xwm network.
Koj lub xov tooj txuas nrog 3G network los ntawm nws daim npav SIM (hauv lub xov tooj ntawm lub xov tooj ntawm tes) lossis nws daim npav 3G (uas tuaj yeem ua ntau hom, zoo li USB , PCMCIA, thiab lwm yam), ob qho tib si uas tau muab los yog muag los ntawm tus neeg muab kev pabcuam.
Qhov no yog li cas cov cuab yeej txuas rau hauv internet thaum nws nyob rau hauv ntau yam ntawm ib lub network 3G. Nyob rau hauv qhov tseeb, tus ntaus ntawv yog rov qab tshaj cov laus dua, uas yog vim li cas ib lub xov tooj 3G tau txais 2G kev pab cuam yog nws muaj thaum 3G service tsis yog.
3G Tus Nqi Yog Dab Tsi?
3G tsis pheej yig, tab sis nws yog ib qho tseem ceeb rau cov neeg siv uas xav tau kev sib txuas ntawm txoj kev tawm mus. Muaj qee tus neeg muab kev pabcuam pub rau hauv cov pob nyiaj siv qis, tabsis feem ntau ntawm lawv muaj cov tswv yim uas tus neeg siv yuav them rau cov ntaub ntawv xa mus, vim hais tias cov cuab yeej siv- pob ntawv . Piv txwv, muaj ntau cov kev pabcuam uas muaj cov nqi qis rau tus thawj gigabyte ntawm cov ntaub ntawv xa mus, thiab ib tus nqi ib-megabyte lossis ib tus nqi-gigabyte tom qab ntawd.
3G thiab lub suab
Wireless technologies yog ib txoj kev rau mobile cov neeg siv ua dawb los yog pheej yig hu thoob ntiaj teb thiab txuag nyiaj ntau ntau vim cov kev siv xov tooj tshiab thiab kev pab cuam. 3G tes hauj lwm muaj qhov kom zoo dua rau kev khiav tawm, tsis zoo li Wi-nkaus, uas tsuas yog siv rau ob peb meters ntawm ib ncig ntawm tus qauv rhiav.
Ib tug neeg siv nrog ib lub xov tooj 3G thiab cov phiaj xwm xov xwm zoo tsim kho rau kev hu xov tooj hu dawb. Lawv tsuas yog yuav tsum nruab ib qho ntawm ntau cov kev pab dawb VoIP , xws li Viber, WhatsApp, lossis Telegram.