HSPA vs HSPA + Network Technology
HSPA thiab HSPA + network thev naus laus zis yog kev tshaj tawm ntawm 3GPP uas yog lub luag haujlwm rau tus qauv tsim lub koom haum rau cov xov tooj ntawm tes broadband. Nws yog qhov tseem ceeb uas ob qhov kev tshaj tawm yog tsom rau kev muab cov ntaub ntawv huab cua ntau dua rau cov neeg siv xov tooj ntawm tes nrog txo qis latency los txhawb ntau yam kev siv uas txhawb nqa xov tooj cua hauv cov neeg siv khoom platform ntawm ib ncig ntawm 3.8 billion hauv GSM tsev neeg ntawm cov thev naus laus zis.
HSPA (High Speed Packet Access) (Tshuaj 5 thiab 6)
HSPA yog cov lus siv los hais txog HSDPA (3GPP Tso Tawm 5) thiab HSUPA (3GPP Tso Tawm 6), uas yog pob ntawv raws li thev naus laus zis Evolved muaj cov ntaub ntawv ntau dua piv rau 3G thiab GPRS. Cov ntaub ntawv siab no xav tau thaum txhawb nqa mobile video streaming application, online gaming, video conferencing thiab lwm yam.
Feem ntau ntawm HSPA raug xa mus rau kev siv tshuab rau 3.5G tes hauj lwm. Txoj kev xav HSPA cov ntaub ntawv tuaj yeem mus txog 14.4 Mbps downlink thiab 5.8 Mbps uplink ntawm qhov siab tshaj plaws uas yog 3-4 npaug ntawm 3G downlink speeds uas twb muaj lawm thiab 15 npaug siab dua GPRS. Tab sis cov tes hauj lwm tam sim no muaj peev xwm muab 3.6Mbps downlink thiab 500 kbps rau 2Mbps uplink feem ntau ntawm cov xov tooj cua channel bandwidth ntawm 5MHz. Thaum txhim kho cov tes hauj lwm rau HSPA los ntawm 3G (WCDMA) nws yuav tsum tau hloov pauv cov downlink uas twb muaj lawm rau HSDPA (High Speed Downlink Packet Access) thev naus laus zis thiab uplink rau HSUPA (High Speed Uplink Packet Access) thev naus laus zis. Nws yog qhov tseem ceeb tias cov kev hloov kho tshiab no feem ntau yog hloov kho software ntau dua li kho vajtse hloov kho rau feem ntau ntawm WCDMA tes hauj lwm. Cov ntaub ntawv siab dua tuaj yeem ua tau vim qhov kev txiav txim siab dua cov qauv kev hloov pauv xws li 16QAM txog 64 QAM (Quadrature Amplitude Modulation) nrog MIMO (Ntau Cov Khoom Siv Tawm Ntau Qhov Tawm) thev naus laus zis.
HSPA+ (HSPA Plus) (Evolved HSPA) (Tshiab 7 thiab 8)
Qhov no tseem hu ua Evolved HSPA uas yog 3GPP tso tawm 7 thiab tso tawm 8 rau cov xov tooj ntawm tes broadband. Cov kev tshaj tawm tshiab yog tsom rau kev nce cov ntaub ntawv los ntawm HSPA cov tes hauj lwm uas twb muaj lawm nrog kev pab los ntawm kev txiav txim siab dua cov qauv kev hloov pauv thiab los ntawm kev siv MIMO cov tswv yim. Cov ntaub ntawv tau tshaj tawm yog tsom rau kev muab Push to Talk over Cellular (PoC), Video thiab lub suab los ntawm IP (VoIP), video sib koom thiab lwm yam.
Cov ntaub ntawv ncov tshiab tau teev tseg rau HSPA + yog 84 Mbps rau downlink thiab 22 Mbps rau uplink thiab tsom mus rau kev ua tiav los ntawm kev siv 64QAM modulation scheme nrog MIMO cov tswv yim. Nws yog ib qho tseem ceeb tias cov ntaub ntawv saum toj no yog txuam nrog ib tus neeg nqa khoom ntawm 5 MHz hauv WCDMA tes hauj lwm thiab kev siv tam sim no muaj peev xwm muab cov ntaub ntawv tus nqi txog 21 Mbps. Nws yuav tsum tau xa mus rau yav tom ntej HSPA + nrog 2 × 2 MIMO nrog 64 QAM muaj peev xwm muab 42Mbps downlink thiab 11.5 Mbps uplink theoretically.
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 +.
Qhov txawv ntawm HSPA thiab HSPA+ (HSPA Plus)
1. HSPA sib haum rau 3GPP tso tawm 5 thiab 6 rau mobile broad band networks thaum HSPA + yog cov qauv hauv 3GPP tso tawm 7 thiab 8.
2. HSPA theoretical ncov cov ntaub ntawv tus nqi tuaj yeem mus txog 14.4 Mbps downlink thiab 5.8 Mbps uplink thaum HSPA + cov ntaub ntawv tus nqi yog nyob rau hauv qhov kev txiav txim ntawm 84 Mbps thiab 21 Mbps feem.
3. Modulation scheme yuav tsum tau siv los ntawm HSPA + yog 64QAM thiab HSPA siv digital modulation schemes pib ntawm 16QAM txog 64 QAM.
4. HSPA + muaj kev pom zoo ntxiv rau tag nrho-IP raws li cov pob txha rov qab kom cov chaw nres tsheb hauv paus txuas nrog IP network yog li cov tub ntxhais tau nrawm dua.
5. HSPA + muaj peev xwm txo qis latency qis dua 50ms thiab tam sim no HSPA tes hauj lwm latency nyob ib ncig ntawm 70ms.
