1. Amahame shingiro
Ukurikije tekinoroji yumwimerere ya LTE (Long Term Evolution), sisitemu ya 5G NR ikoresha tekinoloji nshya nububiko.5G NR ntabwo iragwa gusa OFDMA (Orthogonal Frequency-Division Multiple Access) na FC-FDMA ya LTE ahubwo izungura tekinoroji ya antenna nyinshi ya LTE.Urujya n'uruza rwa MIMO rurenze LTE.Muri modulation, MIMO ishyigikira guhitamo guhuza imiterere ya QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 moderi yo mu rwego rwa kwadrature 16), 64QAM modulation).
Sisitemu ya NR, kimwe na LTE, irashobora kugena byoroshye umwanya ninshuro mugari mugukwirakwiza inshuro nyinshi no kugabana igihe.Ariko bitandukanye na LTE, NR ishyigikira ubugari-bw-ubwikorezi bugari, nka 15/30/60/120 / 240KHz.Umubare munini wabatwara umurongo ushyigikiwe uruta LTE, nkuko bigaragara ku gishushanyo gikurikira:
| U | Umwanya wo gutwara ibintu | Umubare wa buri mwanya | Umubare wigihe cyateganijwe kuri buri kintu | Umubare wigihe cyumwanya wa 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 |
|
Kubara theoretique yo kugereranya agaciro ka NR bifitanye isano numuyoboro mugari, uburyo bwo guhindura, uburyo bwa MIMO, nibipimo byihariye.
Ibikurikira nigihe ikarita yumutungo ikarita
Igishushanyo kiri hejuru ni ikarita yumutungo ikarita igaragara mumibare myinshi ya LTE.Reka tuvuge muri make ibijyanye no kubara igipimo cya 5G cyo kubara hamwe nacyo.
2. kubara igipimo cya NR kumanuka
Ibikoresho biboneka murwego rwumurongo
Muri 5G NR, ibice byibanze byateganijwe PRB yumuyoboro wamakuru bisobanurwa nkibikoresho 12 (bitandukanye na LTE).Ukurikije protocole ya 3GPP, umurongo wa 100MHz (30KHz-itwara abagenzi) ufite PRBs 273 ziboneka, bivuze ko NR ifite 273 * 12 = 3276 itwara abantu murwego rwumurongo.
Ibikoresho biboneka mugihe cyagenwe
Uburebure bwigihe cyagenwe ni kimwe na LTE, buracyari 0.5m, ariko muri buri mwanya, hari ibimenyetso 14 bya OFDMA, urebye ko ibikoresho bimwe bigomba gukoreshwa kugirango wohereze ikimenyetso cyangwa ibintu bimwe na bimwe, hari ibimenyetso bigera kuri 11 ko irashobora gukoreshwa mugukwirakwiza, ibi bivuze ko abagera kuri 11 kuri 14 batwara ibintu bimwe na bimwe byandikirwa muri 0.5m bikoreshwa mugutanga amakuru.
Muri iki gihe, umurongo wa 100MHz (30KHz subcarrier) kuri 0.5ms yoherejwe ni 3726 * 11 = 36036
Imiterere yikadiri (2,5m yikubye kabiri)
Iyo imiterere yimiterere igizwe na 2.5ms yikubye kabiri, igipimo cyihariye cya subframe umwanya wikigereranyo ni 10: 2: 2, kandi hariho (5 + 2 * 10/14) ahantu hamanuka muri 5ms, bityo umubare wibice byamanuka kuri milisegonda ni nka 1.2857.1s = 1000ms, bityo 1285.7 kumanura umwanya bishobora gutegurwa muri 1s.muri iki gihe, umubare wa subcarrier zikoreshwa kuri gahunda yo kumanura ni 36036 * 1285.7
Umukoresha umwe MIMO 2T4R na 4T8R
Binyuze muri tekinoroji ya antenna nyinshi, abakoresha ibimenyetso barashobora gushyigikira amakuru menshi mugihe kimwe.Umubare ntarengwa wa downlink na uplink data stream kumukoresha umwe biterwa numubare muto ugereranije na base base yakira kandi UE yakira ibice, bikumirwa nibisobanuro bya protocole.
Muri 64T64R ya sitasiyo fatizo, 2T4R UE irashobora gushyigikira icyarimwe amakuru yoherejwe icyarimwe.
Ubu R15 protocole verisiyo ishyigikira ntarengwa 8;ni ukuvuga, umubare ntarengwa wa SU-MIMO ushyigikiwe kuruhande rwurusobe ni 8.
Guhindura gahunda yo hejuru 256 QAM
Subcarrier imwe irashobora gutwara bits 8.
Mu ncamake, kubara hafi yikigereranyo cyo hejuru yigitekerezo cyo kumanura:
Umukoresha umwe: MIMO2T4R
273 * 12 * 11 * 1.2857 * 1000 * 4 * 8 = 1.482607526.4bit≈1.48Gb / s
Umukoresha umwe: MIMO4T8R
273 * 12 * 11 * 1.2857 * 1000 * 8 * 8≈2.97Gb / s
Igihe cyo kohereza: Apr-26-2021