3G vs 4G | Ceev, zaus thiab nta piv | Lub roj teeb lub neej tsawg dua hauv 4G
3G thiab 4G ob qho tib si yog mobile wireless nkag siv thev naus laus zis thiab 3G tau siv dav tam sim no thiab 4G tau hloov zuj zus thiab raug xa mus rau qee lub nroog hauv Tebchaws Europe thiab Asmeskas.
3G (Third Generation Networks)
3G yog lub tshuab siv wireless hloov pauv 2G tes hauj lwm. Qhov txiaj ntsig tseem ceeb ntawm 3G yog, nws nrawm dua 2G tes hauj lwm. Smart mobile handsets yog tsim tsis tsuas yog rau lub suab hu, tab sis kuj rau kev siv Internet thiab mobile daim ntaub ntawv. 3G tes hauj lwm tso cai rau ib txhij lub suab thiab cov ntaub ntawv kev pab cuam nrog ceev variation ntawm 200 kbit / s thiab yog hais tias nws tsuas yog cov ntaub ntawv nws yuav xa ob peb Mbit / s.(Mobile Broadband)
Ntau 3G thev naus laus zis tau siv tam sim no thiab qee qhov ntawm lawv yog EDGE (Txhim kho cov ntaub ntawv tus nqi rau GSM Evolution), los ntawm CDMA tsev neeg EV-DO (Evolution-Data Optimized) uas siv Code Division Multiple Access lossis Time Division Multiple Access rau multiplexing, HSPA (High Speed Packet Access) uas siv 16QAM modulation txheej txheem (Quadrature Amplitude Modulation) thiab ua rau cov ntaub ntawv tus nqi ntawm 14 Mbit / s downlink thiab 5.8 Mbit / s uplink speeds) thiab WiMAX (Wireless Interoperability rau Microwave Access - 802.16).
Qhov txiaj ntsig tseem ceeb ntawm 3G tes hauj lwm dhau 2G yog, cov ntaub ntawv ceev dua nrog lub suab.
4G (Forth Generation Networks)
Txhua tus neeg tsom mus rau tam sim no tig mus rau 4G vim nws cov ntaub ntawv tus nqi. Hauv kev sib txuas lus ceev ceev nws muaj 100 Mbit / s (xws li tsheb ciav hlau lossis tsheb) thiab kev sib txuas lus qis qis lossis kev nkag mus ruaj khov yuav ua rau 1 Gbit / s. Qhov no yog kev hloov pauv loj hauv kev siv tshuab wireless.
Nws yog qhov sib npaug heev kom tau txais LAN lossis Gigabit Ethernet txuas rau lub xov tooj ntawm tes.
4G muab txhua qhov kev sib txuas lus IP nrog kev nkag mus rau cov xov tooj ntse, ntsiav tshuaj, laptops thiab txhua lub xov tooj ntse. Theoretically hais lus no 4G nkag mus ceev yog ntau tshaj Cable los yog DSL technologies nyob rau hauv lub siab 4G yog ceev tshaj ADSL, ADSL2 los yog ADSL2+.
Thaum 4G tau pib thiab yog tias koj muaj tsawg kawg 54 Mbits / s (qhov xwm txheej phem tshaj) rub tawm ntawm koj lub xov tooj ntawm tes lossis ntsiav tshuaj, koj tuaj yeem khiav ib daim ntawv thov hauv internet li koj ua hauv desktop computers. Piv txwv li koj tuaj yeem khiav Skype, YouTube, IP TV apps, Video on Demand, VoIP Client thiab ntau ntxiv. Yog tias koj muaj ib tus neeg siv VoIP ntsia ntawm koj lub cuab yeej tes koj tuaj yeem ua VoIP hu los ntawm koj lub xov tooj. Qhov no yuav tua lub suab nrov lag luam sai sai. Nyob rau tib lub sijhawm koj tuaj yeem sau npe rau txhua tus lej hauv zos rau koj tus neeg siv khoom VoIP mobile thiab pib txais kev hu xov tooj ntawm koj lub xov tooj ntawm IP. Piv txwv li yog tias koj nyob hauv New York koj tsis tas yuav tau txais NY tus lej hloov koj tuaj yeem sau npe Toronto tus lej txuas hauv koj lub xov tooj ntawm VoIP tus neeg siv. Txhua qhov chaw koj mus hauv 4G kev pab them nqi lossis thaj chaw Wi-Fi koj tuaj yeem tau txais kev hu rau koj tus lej Toronto. (Txawm tias koj tuaj yeem sau npe rau Switzerland tus lej tas thiab nyob hauv New York).
Koj tuaj yeem siv hu video hla IP thiab muaj ntsej muag sib ntsib ntawm mus. Koj tuaj yeem hu xov tooj dawb rau koj tus poj niam, tus hluas nkauj lossis txawm tuaj yeem muaj lub rooj sib tham video thaum koj mus ncig yog tias koj txuas nrog 4G.
Txawm tias 4G twb tau muab tso rau hauv Tebchaws Europe thiab North America (Qee lub chaw muab kev pabcuam yog Telnor, Tele2, Telia hauv Tebchaws Europe thiab Verizon, Sprint hauv Asmeskas), nws tseem nyob rau theem kev txhim kho. 4G, ntxiv rau lub hom phiaj 100 Mbits / s cov ntaub ntawv tus nqi rau kev txav cov neeg siv khoom thiab 1GB rau cov neeg siv nyob ruaj khov kuj xav kom ua tiav cov kev pabcuam zoo dua rau cov neeg siv kawg yam tsis muaj kev poob qis thiab tso cai sib tham sib roaming thoob ntiaj teb.
Cov 4G thev naus laus zis hauv kev siv yog flash OFDM, 802.16e wireless lossis mobile WiMax thiab HC SDMA, UMB thiab Wi-Fi.
Qhov txawv ntawm 3G thiab 4G
(1) Qhov sib txawv tseem ceeb yog cov ntaub ntawv tus nqi yog nrog 4G koj tuaj yeem theoretically mus txog 100 Mbits / s thaum nyob hauv 3G, theoretically nws nce mus txog 14 Mbit / s downlink thiab 5.8 Mbit / s uplink.
(2) 4G network yog txhua tus IP whereas 3G ib qho kev sib xyaw ntawm Circuit Court thiab pob ntawv hloov network
(3) Tam sim no tau tshaj tawm li cas 4G thev naus laus zis tau txais los ntawm 3G xws li Wi-max thiab LTE, ITU tau txhais lawv li 3.9G tsis yog 4G technologies.
