LTE vs WiMAX
LTE (3GPP Ntev Lub Sijhawm Evolution) thiab WiMAX (Wireless Interoperability rau Microwave Access) yog kev kub ceev 4G wireless thev naus laus zis. 3G kev loj hlob xaus ntawm HSPA + thiab cov tswv lag luam txawb tau pib siv 4G tes hauj lwm los muab ntau bandwidth rau cov xov tooj ntawm tes. Cov 4G thev naus laus zis no muab kev muaj tiag virtual LAN rau cov xov tooj ntawm tes thiab kom hnov qhov kev paub tiag tiag ntawm kev pabcuam triple play.
Nrog kev sib txuas hauv Is Taws Nem ceev ntawm lub xov tooj ntawm tes, cov neeg siv tuaj yeem txaus siab rau kev hu xov tooj, hu xov tooj thiab rub tawm cov ntaub ntawv ceev ceev lossis rub tawm cov ntaub ntawv, thiab saib Internet TV hauv kev pabcuam nyob lossis xav tau.
Twb 4G cov xov tooj ntse tes tau tso tawm los ntawm Motorola, LG, Samsung thiab HTC feem ntau nrog Android operating system. Android Wi-Fi hotspot feature pab kom peb siv 4G mobile los hloov cov kev pabcuam hauv tsev.
Nyob rau hauv luv luv, 4G tsiv teb tsaws tau hloov peb ntawm ib txoj kab kev mus rau 100 txoj kab tsheb loj lossis txoj kev loj mus sai dua. Hauv kev muaj tiag nws coj cov chaw ze dua. Ib yam li hauv Smartphones thaum koj hu xov tooj los ntawm LA mus rau Sydney thiab tham nrog ib tus neeg, lub ntsej muag hu nrog lub suab zoo thiab yees duab coj lub ntiaj teb los ze dua.
LTE (3GPP Long Term Evolution)
LTE (Long Term Evolution) yog qhov tshiab tshaj plaws ntawm kev nkag mus rau hauv xov tooj ntawm tes network technology categorized raws li 4G tes hauj lwm. Qhov kev cia siab loj ntawm LTE yog siab dua thiab kev txav mus los. LTE twb tau xa tawm hauv Asmeskas thiab hauv qee lub nroog nyob sab Europe. Kev pib rau LTE tau pib xyoo 2004 thiab thawj qhov kev tso tawm yog 3GPP Tso Tawm 8, tso tawm thaum Lub Peb Hlis 2009.
LTE yuav tsum muaj 326 Mbps nrog 4 × 4 MIMO thiab 172 Mbps nrog 2 × 2 MIMO hauv 20 MHz spectrum. LTE txhawb nqa FDD (Frequency Division Duplexing) thiab TDD (Time Division Multiplexing). Qhov txiaj ntsig tseem ceeb hauv LTE yog qhov kev nkag siab siab nrog qis latency. Hauv kev muaj tiag LTE tab tom muab 120 Mbps nyob rau lub sijhawm no thiab qhov ceev yog nyob ntawm tus neeg siv qhov ze rau tus pej thuam thiab tus naj npawb ntawm cov neeg siv hauv ib cheeb tsam ntawm tes.
Ntau tshaj 4G thev naus laus zis yog LTE los ntawm cov chaw muab kev pabcuam thiab feem ntau cov neeg siv xov tooj tau pib muab LTE nrog LTE 4G handsets los ntawm Motorola, LG, Samsung thiab HTC.
Tom ntej ntawm LTE yog LTE siab heev uas tab tom tsim tam sim no. LTE Advanced yog rov qab sib xws nrog LTE tab sis LTE tsis rov qab sib xws nrog ib qho 3G tes hauj lwm.
WiMAX (IEEE 802.16)
WiMAX (802.16) (Wireless Interoperability rau Microwave Access) yog 4th Generation mobile nkag tshuab rau kev nkag mus ceev. Cov qauv tam sim no ntawm cov thev naus laus zis no tuaj yeem muab ib puag ncig 40 Mbps hauv qhov tseeb thiab qhov hloov kho tshiab yuav tsum xa 1Gbps hauv qhov kawg kawg.
WiMAX poob rau hauv IEEE 802.16 tsev neeg thiab 802.16e (1 × 2 SIMO, 64 QAM, FDD) muab 144 Mbps download thiab 138 Mbps upload. 802.16m yog qhov xav tias yuav xa tawm ib ncig ntawm 1Gbps hauv cov ntsiab lus kawg.
WiMAX tau kho cov version thiab mobile version. Qhov ruaj khov WiMAX version (802.16d thiab 802.16e) tuaj yeem siv rau cov kev daws teeb meem dav dav rau hauv tsev thiab tuaj yeem siv rau rov qab cov chaw ua haujlwm nyob deb lossis chaw nres tsheb txawb. Lub WiMAX mobile version (802.16m) tuaj yeem siv los hloov GSM thiab CDMA thev naus laus zis nrog kev cia siab dhau los yog hu ua WiMAX 2.
Qhov txawv ntawm LTE thiab WiMAX
(1) Ob leeg yog kev kub ceev 4G wireless nkag tshuab siv OFDMA –MIMO muab rau peb siab dhau.
(2) LTE thiab WiMAX yog txhua tus IP tes hauj lwm uas tsis tshua muaj latency.
(3) Ob leeg muab kev siv internet ceev ceev rau cov neeg siv xov tooj ntawm tes kom paub txog qhov tseeb ntawm kev ua si triple.
(4) Cov tiam tom ntej ntawm LTE yog LTE Advanced thiab kev nce qib ntawm WiMAX yog WiMAX 2.
(5) LTE ua haujlwm hauv 700 MHz, 2.1 thiab 2.5 GHz zaus thiab WiMAX ua haujlwm hauv 2.1, 2.3.2.5 thiab 3.5 GHz zaus
