1. Nā manaʻo kumu
Ma muli o ka ʻenehana mua o LTE (Long Term Evolution), ua hoʻohana ka ʻōnaehana 5G NR i kekahi mau ʻenehana a me nā hale hana.ʻAʻole hoʻoili wale ʻo 5G NR iā OFDMA (Orthogonal Frequency-Division Multiple Access) a me FC-FDMA o LTE akā loaʻa iā ia ka ʻenehana multi-antenna o LTE.ʻOi aku ka holo o MIMO ma mua o LTE.Ma ka modulation, kākoʻo ʻo MIMO i ke koho adaptive o QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multi-level quadrature amplitude modulation), 64QAM (64 multi-level quadrature amplitude modulation), a me 256 QAM (256 multi-level quadrature amplitude. modulation).
Hiki i ka ʻōnaehana NR, e like me LTE, ke hoʻokaʻawale i ka manawa a me ke alapine i ka bandwidth ma o ka hoʻokaʻawale ʻana i ka mahele pinepine a me ka hoʻokaʻawale ʻana i ka manawa.Akā ʻaʻole like me LTE, kākoʻo ka NR i nā laula-sub-carrier ākea, e like me 15/30/60/120/240KHz.ʻOi aku ka kiʻekiʻe o ka bandwidth lawe ukana i kākoʻo ʻia ma mua o LTE, e like me ka hōʻike ʻana ma ke kiʻi ma lalo nei.
| U | Ka hakahaka o ka sub-carrier | Ka helu o kēlā me kēia kau manawa | Ka helu o ka manawa o kēlā me kēia kiʻi | Ka helu o ka manawa o kēlā me kēia 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 |
|
ʻO ka helu ʻana o ka helu kiʻekiʻe o ka NR pili i ka bandwidth, mode modulation, mode MIMO, a me nā ʻāpana kikoʻī.
Aia ma hope iho ka palapala ʻāina kumu manawa-frequency
ʻO ka pakuhi ma luna nei ka palapala ʻāina kumu manawa-frequency i ʻike ʻia ma nā ʻikepili LTE he nui.A e kamaʻilio pōkole e pili ana i ka helu ʻana o ka helu helu kiʻekiʻe 5G me ia.
2. ka helu ana o NR downlink peak rate
Loaʻa nā kumuwaiwai ma ka domain frequency
Ma 5G NR, ua wehewehe ʻia ka ʻāpana hoʻonohonoho kumu PRB o ke kahawai ʻikepili he 12 sub-carriers (ʻokoʻa me LTE).Wahi a ka protocol 3GPP, loaʻa iā 100MHz bandwidth (30KHz sub-carrier) he 273 PRB i loaʻa, ʻo ia hoʻi he 273*12=3276 sub-carriers i ka domain frequency.
Loaʻa nā kumuwaiwai ma ke kahua manawa
ʻO ka lōʻihi o ka manawa manawa like me LTE, he 0.5ms mau, akā i kēlā me kēia manawa, aia nā hōʻailona OFDMA 14, me ka noʻonoʻo pono e hoʻohana ʻia kekahi mau kumuwaiwai no ka hoʻouna ʻana i kahi hōʻailona a i ʻole kekahi mau mea, aia ma kahi o 11 mau hōʻailona. Hiki ke hoʻohana ʻia no ka hoʻouna ʻana, ʻo ia hoʻi, ma kahi o 11 o 14 mau sub-carriers o ke alapine like i hoʻouna ʻia i loko o 0.5ms e hoʻohana ʻia e hoʻouna i ka ʻikepili.
I kēia manawa, 100MHz bandwidth (30KHz subcarrier) ma 0.5ms hoʻouna ʻia ʻo 3726*11=36036
Ka hoʻonohonoho ʻana o ke kiʻi (2.5ms pōʻai pālua ma lalo)
Ke hoʻonohonoho ʻia ka hoʻolālā kiʻi me kahi pōʻai pālua 2.5ms, ʻo 10:2:2 ka lākiō o ka manawa subframe kūikawā, a aia (5+2*10/14) nā ʻāpana downlink i loko o 5ms, no laila ka nui o nā kau lalo i kēlā me kēia millisecond. ma kahi o 1.2857.1s=1000ms, no laila hiki ke hoʻonohonoho ʻia nā manawa manawa downlink 1285.7 i loko o 1s.i kēia manawa, ʻo ka helu o nā subcarriers i hoʻohana ʻia no ka hoʻonohonoho downlink ʻo 36036*1285.7
Mea hoʻohana hoʻokahi MIMO 2T4R a me 4T8R
Ma o ka ʻenehana multi-antenna, hiki i nā mea hoʻohana hōʻailona ke kākoʻo i ka hoʻouna ʻana i ka ʻikepili multi-stream i ka manawa like.ʻO ka helu kiʻekiʻe loa o nā kahawai ʻikepili downlink a uplink no ka mea hoʻohana hoʻokahi e pili ana i ka helu liʻiliʻi o nā papa hoʻokipa kahua kahua a loaʻa iā UE nā papa, i kāohi ʻia e ka wehewehe protocol.
Ma ka 64T64R o ke kahua kahua, hiki i ka 2T4R UE ke kākoʻo i ka hoʻouna ʻana i ka ʻikepili kahawai 4 i ka manawa like.
Kākoʻo ka mana protocol R15 i kēia manawa i ka nui o 8 papa;ʻo ia hoʻi, ʻo ka nui o nā papa SU-MIMO i kākoʻo ʻia ma ka ʻaoʻao pūnaewele he 8 mau papa.
ʻO ka hoʻololi kiʻekiʻe 256 QAM
Hiki i kekahi subcarrier ke lawe i 8 bits.
No ka hōʻuluʻulu ʻana, kahi helu ʻino o ka helu kiʻekiʻe o ka ʻatikala downlink:
Mea hoʻohana hoʻokahi: MIMO2T4R
273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s
Mea hoʻohana hoʻokahi: MIMO4T8R
273*12*11*1.2857*1000*8*8≈2.97Gb/s
Ka manawa kau: Apr-26-2021