Deciphering keeb kwm ntawm kev loj hlob thiab kev hloov ntawm Mobile Communication Technology Kev sib txuas lus yog dab tsi? (4)
4G Network Standard Appendix:
TD-LTE:
LTE yog tus qauv thoob ntiaj teb raws li OFDMA thev naus laus zis thiab tsim los ntawm 3GPP lub koom haum, suav nrog ob hom FDD thiab TDD rau kev sib koom ua ke spectrum thiab unpaired spectrum.
TD-LTE, uas yog Lub Sijhawm Lub Sijhawm Lub Sijhawm Ntev Evolution, yog sib koom ua ke los ntawm cov tuam txhab loj thoob ntiaj teb thiab cov neeg ua haujlwm them los ntawm 3GPP lub koom haum. Ob hom FDD thiab TDD hauv LTE tus qauv yog qhov tseem ceeb tib yam, thiab tsuas muaj qhov sib txawv me me ntawm ob hom, nrog rau qhov zoo sib xws ntawm 90 feem pua. Lub Sijhawm Division Duplexing (TDD) yog ib qho ntawm cov thev naus laus zis thev naus laus zis siv hauv kev sib txuas lus hauv xov tooj ntawm tes thiab sib raug rau FDD zaus faib duplexing.
FDD-LTE:
LTE yog raws li Orthogonal Frequency Division Multiple Access (OFDMA) thev naus laus zis thiab yog tus qauv thoob ntiaj teb tsim los ntawm 3GPP lub koom haum, suav nrog ob hom FDD thiab TDD rau kev sib koom ua ke spectrum thiab unpaired spectrum. Tsuas muaj qhov sib txawv me me ntawm FDD thiab TD hom hauv LTE tus qauv, nrog rau qhov zoo sib xws ntawm 90 feem pua.
Vim muaj yam xws li kev sib txawv ntawm cov thev naus laus zis wireless, sib txawv zaus siv, thiab kev nyiam ntawm ntau lub tuam txhab, kev tsim qauv thiab kev lag luam ntawm FDD-LTE ua ntej ntawm TD-LTE. FDD-LTE tau dhau los ua tus qauv 4G siv dav tshaj plaws hauv cov tebchaws thiab cheeb tsam hauv ntiaj teb, nrog ntau hom kev sib txawv ntawm cov terminals.
Qhov txawv ntawm ob:
Ob qho tib si TD-LTE thiab FDD-LTE yog lub sijhawm sib faib cov thev naus laus zis mus sij hawm ntev, tab sis TD-LTE yog lub sijhawm ntev hloov pauv thev naus laus zis ntawm TDD version, uas yog hu ua time-division duplex thev naus laus zis. Thiab FDD-LTE kuj yog ib lub sij hawm ntev evolution technology. Qhov txawv yog tias FDD-LTE txais kev faib ntau zaus. Zoo ib yam li lub sij hawm faib multiplexing technology thiab zaus division multiplexing technology hauv chav kawm network.
