Kuwerengera kwa 5G Download Peak Rate

1. Mfundo zoyambira

Kutengera ukadaulo woyambirira wa LTE (Long Term Evolution), makina a 5G NR amatengera matekinoloje atsopano ndi zomanga.5G NR sikuti imangolandira OFDMA (Orthogonal Frequency-Division Multiple Access) ndi FC-FDMA ya LTE koma imatenga teknoloji ya LTE yambiri.Kuthamanga kwa MIMO ndikoposa LTE.Pakusinthasintha, MIMO imathandizira kusankha kosinthika kwa QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multilevel quadrature amplitude modulation), 64QAM (64 multilevel quadrature amplitude module), ndi 256 QAM (256 multi-level quadrature amplitude modude) kusintha).

Dongosolo la NR, monga LTE, limatha kugawa nthawi ndi ma frequency mu bandwidth kudzera pa ma frequency division multiplexing ndi kugawa nthawi zambiri.Koma mosiyana ndi LTE, NR imathandizira m'lifupi-sub-carrier wides, monga 15/30/60/120/240KHz.Kuchuluka kwa bandwidth yonyamulira komwe kumathandizidwa ndikwapamwamba kuposa LTE, monga zikuwonekera pachithunzi pansipa:

Kuwerengera kwamalingaliro kwamtengo wapamwamba wa NR kumagwirizana ndi bandwidth, modulation mode, MIMO mode, ndi magawo enaake.

Zotsatirazi ndi mapu azinthu zanthawi zonse

Grafu yomwe ili pamwambayi ndi mapu anthawi zonse omwe amapezeka mu data yambiri ya LTE.Ndipo tiyeni tikambirane mwachidule za kuwerengera kwa nsonga ya 5G nayo.

2. mawerengedwe a NR downlink pachimake

Zida zomwe zilipo mu frequency domain

Mu 5G NR, gawo loyambira lokonzekera PRB la njira ya data limatanthauzidwa ngati zonyamula 12 (zosiyana ndi LTE).Malinga ndi protocol ya 3GPP, 100MHz bandwidth (30KHz sub-carrier) ili ndi 273 PRBs, zomwe zikutanthauza kuti NR ili ndi 273 * 12 = 3276 sub-carriers mu frequency domain.

Zothandizira zomwe zilipo panthawiyi

Kutalika kwa nthawiyo ndi kofanana ndi LTE, komabe 0.5ms, koma nthawi iliyonse, pali zizindikiro za 14 OFDMA, poganizira kuti chinthu china chiyenera kugwiritsidwa ntchito kutumiza chizindikiro kapena zinthu zina, pali zizindikiro za 11 Zitha kugwiritsidwa ntchito pofalitsa, izi zikutanthauza kuti pafupifupi 11 mwa 14 onyamula mafupipafupi omwe amafalitsidwa mkati mwa 0.5ms amagwiritsidwa ntchito potumiza deta.

Panthawiyi, 100MHz bandwidth (30KHz subcarrier) pa 0.5ms kutumiza ndi 3726 * 11 = 36036

Kapangidwe ka chimango (2.5ms kawiri kuzungulira pansipa)

Mapangidwe a chimango akakonzedwa ndi 2.5ms kawiri kuzungulira, gawo lapadera la nthawi ya subframe ndi 10: 2: 2, ndipo pali (5 + 2 * 10/14) mipata yotsika mkati mwa 5ms, kotero chiwerengero cha mipata yotsika pa millisecond. ndi pafupifupi 1.2857.1s=1000ms, kotero mipata ya 1285.7 downlink ikhoza kukonzedwa mkati mwa 1s.panthawiyi, chiwerengero cha subcarriers ntchito downlink ndandanda ndi 36036 * 1285.7

Wogwiritsa ntchito m'modzi MIMO 2T4R ndi 4T8R

Kupyolera mu teknoloji yamitundu yambiri ya antenna, ogwiritsa ntchito zizindikiro amatha kuthandizira kufalitsa deta yamitundu yambiri nthawi imodzi.Kuchuluka kwa mitsinje ya data ya downlink ndi uplink kwa wogwiritsa ntchito m'modzi kumadalira chiwerengero chochepa cha magawo olandirira malo oyambira ndi UE kulandira zigawo, zokakamizidwa ndi tanthauzo la protocol.

Mu 64T64R ya malo oyambira, 2T4R UE imatha kuthandizira mpaka 4 kutumiza kwa data munthawi imodzi.

Mtundu waposachedwa wa protocol wa R15 umathandizira magawo opitilira 8;ndiye kuti, kuchuluka kwa zigawo za SU-MIMO zomwe zimathandizidwa pa intaneti ndi zigawo 8.

Kuwongolera kwakukulu kwa 256 QAM

Wonyamula katundu m'modzi amatha kunyamula ma bits 8.

Mwachidule, kuwerengera movutikira kwa kuchuluka kwa chiphunzitso cha downlink:

Wogwiritsa ntchito m'modzi: MIMO2T4R

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

Wogwiritsa ntchito m'modzi: MIMO4T8R

273*12*11*1.2857*1000*8*8≈2.97Gb/s