1. Likhopolo tsa motheo
Ho ipapisitsoe le theknoloji ea mantlha ea LTE (Long Term Evolution), sistimi ea 5G NR e amohela mahlale a macha le meaho.5G NR ha e fumane feela OFDMA (Orthogonal Frequency-Division Multiple Access) le FC-FDMA ea LTE empa e rua theknoloji ea li-antenna tse ngata tsa LTE.Phallo ea MIMO e feta LTE.Ka modulation, MIMO e ts'ehetsa khetho e feto-fetohang ea QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multilevel quadrature amplitude modulation), 64QAM (64 multilevel quadrature amplitude modulation), le 256 QAM (256 multi-level amplitude quadrature modulation). mofetoledi).
Sistimi ea NR, joalo ka LTE, e khona ho fana ka nako le khafetsa ho bandwidth ka ho arola makhetlo a mangata le karohano ea nako.Empa ho fapana le LTE, NR e ts'ehetsa bophara ba "sub-carrier" bo fapaneng, joalo ka 15/30/60/120/240KHz.Bophahamo ba bandwidth ea carriers bo kaholimo ho LTE, joalo ka ha ho bonts'itsoe setšoantšong se ka tlase:
| U | Sebaka sa mojari-potlana | Nomoro ea sekotjana sa nako | Nako ea nako ea foreimi ka 'ngoe | Nomoro ea nako ea sebaka sa subframe ka 'ngoe |
| 0 | 15 | 14 | 10 | 1 |
| 1 | 30 | 14 | 20 | 2 |
| 2 | 60 | 14 | 40 | 4 |
| 3 | 120 | 14 | 80 | 8 |
| 4 | 240 | 14 | 160 |
|
Palo ea theory ea boleng ba tlhoro ea NR e amana le bandwidth, modulation mode, MIMO mode, le liparamente tse itseng.
E latelang ke 'mapa oa lisebelisoa tsa nako-frequency
Kerafo e ka holimo ke 'mapa oa lisebelisoa tsa nako-frequency o hlahang ho data e ngata ea LTE.Mme ha re bue ka bokhuts'oane ka palo ea lipalo tsa sekhahla sa 5G le eona.
2. palo ea sekhahla sa tlhoro ea NR downlink
Lisebelisoa tse teng sebakeng sa frequency domain
Ho 5G NR, yuniti ea motheo ea kemiso ea PRB ea mocha oa data e hlalosoa e le li-sub-carriers tse 12 (tse fapaneng le LTE).Ho ea ka protocol ea 3GPP, 100MHz bandwidth (30KHz sub-carrier) e na le 273 e fumanehang PRBs, e bolelang hore NR e na le 273 * 12 = 3276 sub-carriers sebakeng sa maqhubu.
Lisebelisoa tse teng sebakeng sa nako
Bolelele ba nako ea nako bo tšoana le LTE, e ntse e le 0.5ms, empa ka nako e 'ngoe le e' ngoe, ho na le matšoao a 14 OFDMA, ho nahanoa hore mohloli o mong o hloka ho sebelisoa ho romela letšoao kapa lintho tse ling, ho na le matšoao a 11 a pota-potileng. e ka sebelisoa bakeng sa phetisetso, sena se bolela hore hoo e ka bang 11 ho 14 li-sub-carriers tsa maqhubu a tšoanang a fetisitsoeng ka hare ho 0.5ms li sebelisetsoa ho fetisetsa data.
Ka nako ena, 100MHz bandwidth (30KHz subcarrier) ho 0.5ms phetiso ke 3726*11=36036
Sebopeho sa foreme (2.5ms habeli potoloho ka tlase)
Ha sebopeho sa foreimi se hlophisoa ka potoloho e habeli ea 2.5ms, karo-karolelano e khethehileng ea nako ea subframe ke 10: 2: 2, 'me ho na le (5+2*10/14) li-downlink slots ka har'a 5ms, kahoo palo ea li-downlink slots ka millisecond. hoo e ka bang 1.2857.1s=1000ms, kahoo 1285.7 downlink time slots e ka hlophisoa ka hare ho 1s.ka nako ena, palo ea li-subcarriers tse sebelisetsoang kemiso ea downlink ke 36036 * 1285.7
Mosebelisi a le mong MIMO 2T4R le 4T8R
Ka theknoloji ea li-antenna tse ngata, basebelisi ba lipontšo ba ka tšehetsa phetiso ea data e ngata ka nako e le 'ngoe.Palo e phahameng ka ho fetisisa ea melaetsa ea data ea downlink le ea uplink bakeng sa mosebedisi a le mong e itšetlehile ka palo e batlang e le nyenyane ea lihlopha tsa ho amohela liteishene tsa setsi le UE e amohelang lihlopha, e hatelletsoeng ke tlhaloso ea protocol.
Ho 64T64R ea setsi sa setsi, 2T4R UE e ka ts'ehetsa ho fihla ho 4 ho fetisoa ha data ka nako e le 'ngoe.
Mofuta oa hajoale oa protocol oa R15 o ts'ehetsa boholo ba likarolo tse 8;ke hore, palo e kholo ea likarolo tsa SU-MIMO tse tšehetsoeng ka lehlakoreng la marang-rang ke likarolo tse 8.
Mokhoa o phahameng oa ho feto-fetoha ha maemo 256 QAM
Subcarrier e le 'ngoe e ka jara likotoana tse 8.
Ho akaretsa, palo e boima ea sekhahla sa tlhoro ea theory ea downlink:
Mosebelisi a le mong: MIMO2T4R
273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s
Mosebelisi a le mong: MIMO4T8R
273*12*11*1.2857*1000*8*8≈2.97Gb/s
Nako ea poso: Apr-26-2021