WiMAX vs WiMAX2 Network Technology
WiMAX thiab WiMAX2 yog microwave nkag siv tshuab cov qauv siv hauv kev sib txuas lus txawb. Niaj hnub no qhov kev thov rau cov kev pabcuam dav dav tau loj hlob sai thiab tsuas yog siv cov kev daws teeb meem xws li Digital subscriber line (DSL), Ethernet, fiber optics muaj peev xwm ua tiav cov kev xav tau. Tab sis nws yog qhov kim heev los muab kev sib txuas mais kawg uas siv cov thev naus laus zis txuas thiab muab broadband rau cov chaw nyob deb nroog tsis muaj txiaj ntsig, yog li xav tau kev daws teeb meem wireless. Qhov kev xav tau tshwm sim rau lub voj wireless yog qhov kev thov siab rau Voice over IP, multimedia streaming, sib tham sib gaming thiab lwm yam.yog li IEEE 802.11 Wi-Fi tes hauj lwm tau tsim los ua kom tau raws li qhov xav tau tab sis lawv qhov luv luv thiab qis bandwidth tau txwv lawv lub peev xwm thiab WiMAX (Kev Sib Tham Thoob Ntiaj Teb rau Microwave Access) tau tshwm sim los ua qhov sib txawv.
WiMAX
WiMAX (Kev Sib Tham Thoob Ntiaj Teb rau Microwave Access) yog ib qho ntawm cov thev naus laus zis tau txais rau 4G tes hauj lwm teev los ntawm ITU. Nws yog raws li IEEE 802.16 tus qauv thiab uas tseem hu ua wirelessMAN thiab lub hom phiaj tseem ceeb ntawm cov lus qhia tshwj xeeb yog los ua lub voj wireless es tsis txhob siv cov xov tooj txuas nrog rau kev siv dav dav. Txawb WiMAX yog IEEE 802.16e thiab cov spectrum tam sim no siv rau WiMAX spans ntawm 2.3 GHz txog 3.5 GHz. Multiple Access Technology siv yog OFDMA (Orthogonal Frequency Division Multiple Access) nrog bandwidth sib txawv ntawm 1.25 MHz txog 20 MHz raws li qhov xav tau.
WiMAX tuaj yeem muab kev pab them nqi mus txog 50 km lossis downlink ceev ntawm 70 Mbps ntawm feem ntau thiab qhov kev sib koom ua ke ntawm qhov kev ncua deb thiab kev pab them nqi yog qhov kev txwv loj. WiMAX architecture muaj peb yam tseem ceeb xws li MSS (Mobile Service Station), ASN (Access Service Network) thiab CSN (Connectivity Service Network) piv rau GSM thiab 3G networks.
WiMAX2
Qhov no yog IEEE 802.16m tus qauv thiab nws qhov kev siv yuav raug coj mus rau hauv 2012 feem ntau tej zaum. Cov txheej txheem tshiab no rov qab sib haum nrog 802.16e tus qauv (WiMAX) uas twb muaj lawm thiab vim li ntawd kev hloov kho tshiab rau cov txheej txheem tshiab yog tus nqi zoo. Lub hom phiaj tseem ceeb tom qab tus qauv tshiab yog muab cov kev sib txuas ceev ntawm ntau dua 100 Mbps rau cov neeg siv nrog qis latency thiab muaj peev xwm VoIP. Nws tau hais tias cov ntaub ntawv siab tau ua tiav los ntawm cov kav hlau txais xov ntse tshuab nrog ntau txoj hauv kev. Kev siv spectrum yog qis dua 6GHz thiab tuaj yeem ua haujlwm ntawm qhov ntau teev rau IMT - siab heev nrog bandwidth txawv ntawm 5MHz txog 40 MHz nyob ntawm qhov xav tau.
Qhov txawv ntawm WiMAX thiab WiMAX2 Network Technology
1. WiMAX downlink ceev yog nyob rau hauv thaj tsam ntawm 100 Mbps thaum WiMAX2 lub hom phiaj ntawm kev muab 300 Mbps rau cov neeg siv khoom uas tau sib xws nrog ITU specifications rau 4G network technology.
2. WiMAX2 thev naus laus zis siv 4 × 2 MIMO kav hlau txais xov ua kom cov teeb liab nyob txhua qhov chaw kom qhov ceev yuav raug muab ob npaug rau ntawm WiMAX.
3. WiMAX channel bandwidth yog 20MHz thiab WiMAX2 bandwidth tau muab ob npaug rau thiab sib txawv bandwidth yog siv raws li kev khiav tsheb.
4. WiMAX yog tam sim no xa mus rau ntau lub teb chaws thiab tib neeg siv tom qab ntawd txhua hnub thiab WiMAX2 yuav tsum tau ua lag luam nyob nruab nrab ntawm 2011 - 2012.
