Interim 2.5G tshuab ua ke tau muab cov ntaub ntawv coj los hloov tshiab
Hauv ntiaj teb cov xov tooj ntawm tes, 2.5G wireless technology yog ib tug steppingstone uas txuas ntxiv siv ob lub cim ( 2G ) wireless technology thiab tiam thib peb ( 3G ) wireless technology. Thaum 2G thiab 3G yog thawm xyoo txhais tias cov kev cai wireless, 2.5G tsis yog. Nws yog tsim rau kev lag luam.
Raws li cov kauj ruam ntawm 2G los ntawm 3G, 2.5G pom qee qhov kev kho tshiab hauv 3G tes hauj lwm nrog rau pob ntawv sib txuas. Cov evolution ntawm 2G rau 3G ushered hauv ceev thiab siab dua cov ntaub ntawv kis tau tus mob.
Evolution ntawm 2.5G Tshuab
Nyob rau hauv 1980s, cellphones ua haujlwm ntawm analog 1G tshuab. Cov kev siv Digital 2G pib ua ntej thaum ntxov xyoo 1990 nyob hauv lub ntiaj teb no rau kev sib txuas lus (GSM) txuj. Lub tshuab yog muaj raws li cov sij hawm sib faib ntau zaus (TDMA) los yog txoj kev faib ntau hom (CDMA). Txawm hais tias 2G tshuab tau superseded los ntawm tom qab tshuab, nws tseem muaj nyob thoob ntiaj teb.
Interim 2.5G tshuab tau ua ib qho txheej txheem pob khoom hloov hloov uas ntau dua li nws tus thawj ntawm. Nws cov infrastructure yuav muab siv rau hauv ib qho uas yuav tsum tau muaj ntau dua li ntawm ib feeb twg, uas ua kom nws zoo tshaj 2G tshuab. Lub 2.5 technology tau ua raws li 2.75G, qhov twg muaj peev xwm tshaj li ntawm peb lub hauv paus, thiab 3G technology hauv kev lig 1990s. Nws thiaj li, 4G thiab 5G ua raws li.
2.5G thiab GPRS
Lub sij hawm 2.5G siv qee zaus siv rau General Packet Radio Service ( GPRS ), uas yog ib qho qauv siv xov tooj ntawm tes siv rau GSM networks thiab yog thawj kauj ruam hauv cov evolution ntawm 3G technology. GPRS tes hauj lwm nws tau xaus rau cov ntaub ntawv Enhanced Data rau GSM Evolution ( EDGE ), uas yog lub pob zeb ntawm 2.75G technology, ntxiv kev nce qib uas tsis yog ib qho qauv siv.