Deciphering keeb kwm ntawm kev loj hlob thiab kev hloov ntawm Mobile Communication Technology Kev sib txuas lus yog dab tsi? (3)
3G: Tus qauv kev sib txuas lus txawb thib peb
3G muab faib ua plaub hom qauv, xws li CDMA2000, WCDMA, TD-SCDMA, thiab WiMAX. Ntawm ntau tus qauv ntawm 3G, lo lus CDMA muaj qhov cuam tshuam ntau tshaj plaws. CDMA yog lub npe luv ntawm Code Division Multiple Access, uas yog lub hauv paus kev tshaj lij ntawm kev sib txuas lus mobile thib peb.
CDMA system qhia tau hais tias muaj peev xwm loj rau kev txhim kho vim nws txoj kev npaj yooj yim zaus, lub peev xwm loj, kev siv ntau zaus coefficient, muaj peev xwm tiv thaiv ntau yam, kev sib txuas lus zoo, muaj peev xwm muag, thiab muag muag.
4G: Wireless cellular xov tooj kev sib txuas lus raws tu qauv 100Mbps download ceev
4G network hais txog plaub-tiam wireless cellular xov tooj kev sib txuas lus raws tu qauv. Nws yog cov khoom lag luam uas sib koom ua ke 3G thiab WLAN thiab tuaj yeem xa cov duab yeeb yaj kiab zoo thiab cov duab xa tawm zoo piv rau cov lus txhais hauv TV. Lub 4G system tuaj yeem rub tawm ntawm 100Mbps, uas yog 2,000 lub sijhawm sai dua li dial-up, thiab upload ntawm 20Mbps.
4G cov khoom lag luam muaj ntau dua
Niaj hnub no, 4G teeb liab kev pab them nqi yog dav heev. Muaj ntau thiab ntau lub xov tooj ntawm tes thiab ntsiav tshuaj cov khoom uas txhawb TD-LTE thiab FDD-LTE. Ntau cov ntsiav tshuaj txhawb 4G network raws li tus qauv. Android thiab Win system ntsiav tshuaj uas txhawb kev hu xov tooj thiab network kuj muaj. Feem ntau.
Tsis muaj qhov tsis ntseeg tias 4G tes hauj lwm tau nce kev ceev ntawm kev sib txuas ntawm tes. Rau ntau ntawm peb, qhov no yog ib kauj ruam loj rau pem hauv ntej los ntawm kev sib txuas ruaj khov.
Rau cov neeg siv, qhov sib txawv loj tshaj plaws ntawm 2G, 3G, thiab 4G tes hauj lwm yog qhov sib txawv sib kis ceev. Raws li cov tiam tshiab ntawm kev sib txuas lus thev naus laus zis, 4G tes hauj lwm tau txhim kho kev sib kis ceev heev. Hauv txoj kev xav, lub network ceev yog 50 npaug ntawm 3G, thiab qhov kev paub tiag tiag yog li 10 npaug. Internet ceev yog piv rau 20M hauv tsev broadband, yog li 4G network tuaj yeem muaj qhov nrawm heev. Saib cov yeeb yaj kiab siab, cov ntaub ntawv loj sib kis ceev ceev heev.
