1. Mafungiro anokosha
Kubva pane yekutanga tekinoroji yeLTE (Yakareba Nguva Evolution), iyo 5G NR sisitimu inotora humwe hunyanzvi hutsva uye zvivakwa.5G NR haingogari nhaka yeOFDMA chete (Orthogonal Frequency-Division Multiple Access) uye FC-FDMA yeLTE asi inogara nhaka tekinoroji yakawanda-antenna yeLTE.Kuyerera kweMIMO kunodarika LTE.Mukugadzirisa, MIMO inotsigira kusarudzwa kweQPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multi-level quadrature amplitude modulation), 64QAM (64 multi-level quadrature amplitude modulation), uye 256 QAM (256 multi-level quadrature amplitude modulation). modulation).
Iyo NR system, senge LTE, inogona kugovera nguva uye frequency mubandwidth kuburikidza nefrequency division multiplexing uye nguva-kupatsanura kuwanda.Asi kusiyana neLTE, iyo NR inotsigira kuchinjika-sub-mutakuri upamhi, senge 15/30/60/120/240KHz.Iyo yakanyanya mutakuri bandwidth inotsigirwa yakakwira kupfuura LTE, sezvakaratidzwa mumufananidzo uri pazasi:
| U | Nzvimbo ye sub-carrier | Nhamba yenguva yakatarwa | Huwandu hwenguva yakatarwa pafuremu imwe neimwe | Huwandu hwenguva yakatarwa pane imwe subframe |
| 0 | 15 | 14 | 10 | 1 |
| 1 | 30 | 14 | 20 | 2 |
| 2 | 60 | 14 | 40 | 4 |
| 3 | 120 | 14 | 80 | 8 |
| 4 | 240 | 14 | 160 |
|
Iyo theoretical kuverenga kweiyo peak kukosha kweNR ine hukama nebandwidth, modulation mode, MIMO modhi, uye yakatarwa paramita.
Inotevera inguva-frequency resource mepu
Girafu iri pamusoro ndiyo mepu yenguva-frequency resource inoonekwa mune yakawanda LTE data.Uye ngatitaure muchidimbu nezve kuverenga kweiyo 5G peak rate kuverenga nayo.
2. kuverenga kweNR downlink peak rate
Zviwanikwa zviripo mufrequency domain
Mu5G NR, iyo yekutanga kuronga unit PRB yedata chiteshi inotsanangurwa se 12 sub-vatakuri (yakasiyana neLTE).Maererano ne 3GPP protocol, 100MHz bandwidth (30KHz sub-carrier) ine 273 inowanikwa PRBs, zvinoreva kuti NR ine 273 * 12 = 3276 sub-carriers mu frequency domain.
Zviwanikwa zviripo mudura renguva
Hurefu hwenguva yenguva yakafanana neLTE, ichiri 0.5ms, asi mune imwe neimwe nguva slot, pane 14 OFDMA zviratidzo, tichifunga kuti imwe sosi inoda kushandiswa kutumira chiratidzo kana zvimwe zvinhu, pane zvakatenderedza gumi nezviratidzo izvo. inogona kushandiswa kutapurirana, izvi zvinoreva kuti anenge gumi nerimwe egumi nemana-vatakuri veiyo yakafanana frequency inofambiswa mukati me0.5ms inoshandiswa kuendesa data.
Panguva ino, 100MHz bandwidth (30KHz subcarrier) pa 0.5ms kutapurirana ndiko 3726*11=36036
Chimiro chechimiro (2.5ms kaviri-kutenderera pazasi)
Kana chimiro chefuremu chagadziriswa ne 2.5ms kaviri kutenderera, iyo yakakosha subframe nguva slot ratio ndeye 10: 2: 2, uye kune (5+2 * 10/14) downlink slots mukati me5ms, saka huwandu hwedownlink slots pamillisecond. ingangoita 1.2857.1s=1000ms, saka 1285.7 downlink time slots inogona kurongwa mukati me1s.panguva ino, nhamba ye subcarriers inoshandiswa pakugadzirisa downlink ndeye 36036 * 1285.7
Mushandisi mumwechete MIMO 2T4R uye 4T8R
Kuburikidza neakawanda-antenna tekinoroji, vashandisi vechiratidzo vanogona kutsigira akawanda-rukova kufambisa data panguva imwe chete.Huwandu hwepamusoro hwedownlink uye uplink data hova dzemushandisi mumwe chete zvinoenderana nehuwandu hudiki hwemabhesi echiteshi chekugamuchira masevhisi uye UE inogamuchira maseru, inomanikidzwa neprotocol tsananguro.
Mune 64T64R ye base chiteshi, iyo 2T4R UE inogona kutsigira anosvika mana ekutepfenyura data kufambiswa panguva imwe chete.
Ikozvino R15 protocol vhezheni inotsigira huwandu hwe8 layer;kureva kuti, huwandu hwepamusoro hweSU-MIMO layers inotsigirwa padivi retiweki ndeye 8 layer.
Yakakwirira kurongeka modulation 256 QAM
Imwe subcarrier inogona kutakura 8 bits.
Kupfupisa, kuverengera kwakakasharara kwehuwandu hwepamusoro hweiyo downlink theory:
Mushandisi mumwechete: MIMO2T4R
273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s
Mushandisi mumwechete: MIMO4T8R
273*12*11*1.2857*1000*8*8≈2.97Gb/s
Nguva yekutumira: Kubvumbi-26-2021