Kev suav ntawm 5G Download Peak Rate

1. Cov ntsiab lus tseem ceeb

Raws li tus thawj thev naus laus zis ntawm LTE (Long Term Evolution), 5G NR system tau txais qee cov thev naus laus zis tshiab thiab kev tsim vaj tsev.5G NR tsis tsuas yog tau txais OFDMA (Orthogonal Frequency-Division Multiple Access) thiab FC-FDMA ntawm LTE tab sis tau txais txiaj ntsig ntau lub kav hlau txais xov ntawm LTE.Kev khiav ntawm MIMO yog ntau tshaj LTE.Hauv kev hloov kho, MIMO txhawb kev hloov pauv ntawm QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multi-level quadrature amplitude modulation), 64QAM (64 multi-level quadrature amplitude modulation), thiab 256 QAM (256 multi-level quadrature modulation).

NR system, zoo li LTE, tuaj yeem hloov pauv sijhawm thiab zaus hauv bandwidth los ntawm kev faib ntau zaus thiab faib sijhawm sib faib.Tab sis tsis zoo li LTE, NR txhawb qhov sib txawv-sub-cov cab kuj dav, xws li 15/30/60/120/240KHz.Qhov siab tshaj plaws tus neeg nqa khoom bandwidth txhawb siab yog siab dua LTE, raws li qhia hauv daim duab hauv qab no:

Kev suav cov theoretical ntawm tus nqi siab tshaj ntawm NR yog cuam tshuam nrog bandwidth, hom kev hloov pauv, MIMO hom, thiab cov kev txwv tshwj xeeb.

Hauv qab no yog daim ntawv qhia kev siv sijhawm sijhawm

Daim duab saum toj no yog daim ntawv qhia sij hawm-zaug uas tshwm sim hauv ntau cov ntaub ntawv LTE.Thiab cia peb luv luv tham txog kev suav ntawm 5G ncov tus nqi suav nrog nws.

2. kev suav ntawm NR downlink ncov tus nqi

Muaj cov peev txheej hauv qhov zaus

Hauv 5G NR, lub sijhawm teem caij pib PRB ntawm cov ntaub ntawv channel tau txhais tias yog 12 sub-carriers (sib txawv ntawm LTE).Raws li 3GPP raws tu qauv, 100MHz bandwidth (30KHz sub-carrier) muaj 273 muaj PRBs, uas txhais tau hais tias NR muaj 273 * 12 = 3276 sub-carriers nyob rau hauv lub zaus sau.

Muaj cov peev txheej hauv lub sijhawm

Qhov ntev ntawm lub sijhawm yog tib yam li LTE, tseem 0.5ms, tab sis hauv txhua lub sijhawm, muaj 14 OFDMA cov cim, xav tias qee qhov kev pabcuam yuav tsum tau siv los xa cov teeb liab lossis qee yam, muaj nyob ib ncig ntawm 11 cov cim uas. tuaj yeem siv rau kev sib kis, qhov no txhais tau hais tias kwv yees li 11 ntawm 14 sub-carriers ntawm tib zaus kis hauv 0.5ms yog siv los xa cov ntaub ntawv.

Lub sijhawm no, 100MHz bandwidth (30KHz subcarrier) ntawm 0.5ms kis tau tus mob yog 3726 * 11 = 36036

Ncej qauv (2.5ms ob lub voj voog hauv qab)

Thaum cov qauv tsim tau teeb tsa nrog 2.5ms ob lub voj voog, qhov tshwj xeeb subframe lub sij hawm qhov sib piv yog 10: 2: 2, thiab muaj (5 + 2 * 10/14) downlink slots nyob rau hauv 5ms, yog li tus naj npawb ntawm downlink slots ib millisecond yog 1.2857.1s = 1000ms, yog li 1285.7 downlink lub sijhawm tuaj yeem teem sijhawm hauv 1s.lub sijhawm no, tus naj npawb ntawm cov subcarriers siv rau kev teem caij downlink yog 36036 * 1285.7

Tib neeg siv MIMO 2T4R thiab 4T8R

Los ntawm ntau lub kav hlau txais xov thev naus laus zis, cov neeg siv teeb liab tuaj yeem txhawb nqa ntau cov ntaub ntawv xa mus rau tib lub sijhawm.Qhov siab tshaj plaws ntawm downlink thiab uplink cov ntaub ntawv ntws rau ib tus neeg siv yog nyob ntawm tus lej me me ntawm cov chaw txais tos cov khaubncaws sab nraud povtseg thiab UE tau txais cov khaubncaws sab nraud povtseg, txwv los ntawm cov txheej txheem txhais.

Hauv 64T64R ntawm lub hauv paus chaw nres tsheb, 2T4R UE tuaj yeem txhawb nqa mus txog 4 kwj cov ntaub ntawv xa mus ib txhij.

Tam sim no R15 raws tu qauv version txhawb ntau tshaj 8 txheej;uas yog, qhov siab tshaj plaws ntawm SU-MIMO txheej txhawb rau sab network yog 8 txheej.

High order modulation 256 QAM

Ib lub subcarrier tuaj yeem nqa 8 khoom.

Txhawm rau ua kom tiav, kev suav ntxhib ntawm qhov siab tshaj plaws ntawm qhov kev xav downlink:

Tib neeg siv: MIMO2T4R

273 * 12 * 11 * 1.2857 * 1000 * 4 * 8 = 1.482607526.4bit≈ 1.48Gb/s

Tib neeg siv: MIMO4T8R

273 * 12 * 11 * 1.2857 * 1000 * 8 * 2.97Gb/s