HSPA+ vs LTE | HSPA Plus vs LTE Ceev, Spectrum, Nta Piv | 3.75 G vs 4G Roj teeb Lub neej yog ntau dua hauv HSPA +
HSPA+ thiab LTE yog ob qho tib si mobile broadband technologies rau kev nkag mus ceev. LTE yog qhov kev siv thev naus laus zis tshiab tam sim no tau teeb tsa hauv ntau lub teb chaws rau kev siv ceev ceev mobile broadband. Hauv qee lub tebchaws LTE tau ua lag luam tawm. Cov tuam txhab loj tshaj plaws hauv ntiaj teb xws li AT&T (ATT), Verizon twb tau pib tsiv mus rau LTE. WiMAX kuj tseem yog lwm lub thev naus laus zis uas tau teev tseg hauv 4G tab sis piv rau feem ntau ntawm cov neeg nqa khoom loj tau tsiv mus rau LTE. Hauv Teb Chaws Asmeskas sprint siv WiMAX rau kev nkag siab ceev thiab muab kev pabcuam sib npaug rau LTE. Lwm tus neeg nqa khoom hauv Asmeskas T-Mobile tab tom hloov kho lawv lub network los ntawm HSPA + 21Mbps rau HSPA + 42Mbps.
HSPA+(Evolved High Speed Packet Access)
Qhov no yog qhov tso tawm 7, 8 thiab siab dua los ntawm 3GPP (Third Generation Partnership Project) uas teeb tsa cov qauv rau cov xov tooj ntawm tes. Qhov no tso cai rau cov ntaub ntawv tus nqi ntawm 84Mbps downlink thiab 22Mbps uplink nrog kev siv MIMO (Multiple Inputs thiab Multiple Outputs) cov txheej txheem thiab kev txiav txim siab dua cov qauv kev hloov pauv xws li 64QAM (Quadrature Amplitude Modulation).
Nyob rau hauv HSPA + (Tshiab 7) lub peev xwm yog ob npaug ntawm HSPA thiab ntau dua ob npaug ntawm lub peev xwm ntawm lub suab li WCDMA. Hauv Kev Tshaj Tawm 8 HSPA qhia txog lub tswv yim multicarrier thiab ob lub 5MHz cov neeg nqa khoom tau ua ke ua ke los ua ob npaug ntawm cov ntaub ntawv tus nqi. Nrog rau cov kev hloov pauv no, HSPA + muaj peev xwm muab qhov siab tshaj plaws, lub sijhawm latency qis thiab lub sijhawm tham ntau dua.
Nyob rau hauv Tshaj Tawm 7 cov ntaub ntawv tus nqi ntawm downlink yog 28Mbps thiab hauv R8 nws tau txuas ntxiv mus rau 42Mbps theoretically. Tom qab tso tawm zoo li R9 tab tom xav txog kev siv MIMO cov txheej txheem uas muaj peev xwm ua ob npaug ntawm cov ntaub ntawv tus nqi thiab nws nyob ib puag ncig 84Mbps. Cov txheej txheem MIMO tau siv hauv R7 txhawb nqa 2 × 2 MIMO uas 2 xa cov kav hlau txais xov ntawm nodeB thiab ob lub receivers ntawm lub davhlau ya nyob twg hauv lub xov tooj ntawm tes uas ob qho tib si cov ntaub ntawv xa mus rau orthogonally yog li cov ntaub ntawv tus nqi yog ob npaug yam tsis tau nce bandwidth ntawm lub kaw lus.
Vim cov ntaub ntawv siab tau muab los ntawm HSPA + nws tuaj yeem siv los ua kev nkag mus rau hauv internet broadband. Cov ntawv thov xws li VoIP, qis qis hauv internet ua si, streaming, video hu, multicast thiab ntau ntxiv muaj peev xwm los ntawm HSPA + enabled mobile devices.
HSPA + tseem hu ua Is Taws Nem HSPA vim nws qhov kev xaiv tsim qauv tseem hu ua All-IP architecture uas tag nrho cov chaw nres tsheb txuas nrog txhua tus IP raws li cov pob txha rov qab. Nws yog ib qho tseem ceeb uas HSPA + rov qab sib haum nrog 3GPP tso tawm 5 thiab 6 nrog kev txhim kho yooj yim ntawm HSPA rau HSPA +.
LTE (Long Term Evolution)
LTE yog ib qho ntawm cov thev naus laus zis tau txais los ntawm ITU ua 4G thev naus laus zis uas muaj peev xwm ua tau raws li cov qauv teev tseg los ntawm ITU rau 4G tes hauj lwm. 4G tes hauj lwm yog tsim los ua kom muaj peev xwm thiab ceev ntawm cov xov tooj cua sib txuas.
Cov ntaub ntawv tus nqi teev rau LTE yog 100Mbps downlink thiab 50Mbps uplink nrog qis latency tsawg dua 10ms uas txaus siab rau ITU specifications rau 4G tes hauj lwm ib yam nkaus.
Cov bandwidths siv rau LTE yog txawv ntawm 1.4MHz txog 20 MHz thiab txhawb FDD (Frequency Division Multiplexing) thiab TDD (Time Division Multiplexing).
Ua raws li xov tooj cua nkag tau siv thev naus laus zis hauv LTE tes hauj lwm thaum ua tiav cov ntaub ntawv ntau dua, MIMO (Multiple Input Multiple Output), OFDMA (Orthogonal Frequency Division Multiple Access) thiab SC-FDMA (Single Carrier FDMA). SC FDMA zoo ib yam li OFDMA tshwj tsis yog tias nws siv qee qhov kev ua DFT ntxiv thiab tam sim no qhov no tau pom zoo los ntawm 3GPP kom siv los ua cov txheej txheem kev sib txuas lus uplink vim kev xa hluav taws xob ua haujlwm tau zoo thiab tus nqi ntawm cov khoom siv txawb.
Cov kab lus hauv qab no yuav tsum tau siv hauv LTE tes hauj lwm hauv ntau qhov chaw hauv ntiaj teb 700 thiab 1900 MHz hauv North America, 900, 1800, 2600 MHz hauv Europe thiab 1800 thiab 2600 MHz hauv Asia thiab 1800 MHz hauv Australia.
Qhov txawv ntawm HSPA+ thiab LTE
1. HSPA+ tau sib xws nrog cov kev tshaj tawm yav dhau los thiab LTE tsis rov qab sib xws nrog 3G tes hauj lwm.
2. HSPA + cov ntaub ntawv tus nqi muaj peev xwm xa 84Mbps downlink siab tshaj plaws thiab LTE muaj peev xwm muab ntau tshaj 100Mbps downlink.
3. LTE siv OFDMA thiab SC FDMA hauv xov tooj cua nkag tau nrog MIMO cov txheej txheem thiab HSPA + tso siab rau MIMO cov txheej txheem.
4. HSPA + channel bandwidth yog tsau ntawm 5MHz thiab nws muab ob lub channel thaum ob npaug ntawm cov ntaub ntawv tus nqi thiab LTE siv sib txawv bandwidth ntawm 1.4MHz txog 20 MHz.
