1. Echiche ndị bụ isi
Dabere na teknụzụ izizi nke LTE (Long Term Evolution), sistemụ 5G NR na-anabata ụfọdụ teknụzụ na ihe owuwu ọhụrụ.5G NR ọ bụghị naanị na-eketa OFDMA (Orthogonal Frequency-Division Multiple Access) na FC-FDMA nke LTE mana ketara teknụzụ multi-antenna nke LTE.Ọsọ MIMO karịrị LTE.Na mgbanwe mgbanwe, MIMO na-akwado nhọrọ mgbanwe nke QPSK (Orthogonal Frequency-Division Multiple Access), 16QAM (16 multi-level quadrature amplitude modulation), 64QAM (64 multi-level quadrature amplitude modulation), na 256 QAM (256 multi-level quadrature amplitude amplitude mgbanwe).
Usoro NR, dị ka LTE, nwere ike na-agbanwe agbanwe oge na ugboro na bandwit site ugboro nkewa multiplexing na oge-nkewa multiplexing.Mana n'adịghị ka LTE, NR na-akwado obosara-sub-bu-ebu, dị ka 15/30/60/120/240KHz.Oke bandwit nke ebu na-akwado dị elu karịa LTE, dịka egosiri na foto dị n'okpuru:
| U | Oghere nke sub-ebu | Ọnụ ọgụgụ nke oghere kwa oge | Ọnụọgụ nke oghere oge nke otu etiti | Ọnụọgụ nke oghere oge nke kwa 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 |
|
Ngụkọ usoro ihe ọmụmụ nke ọnụ ahịa kacha elu nke NR metụtara bandwit, ọnọdụ mgbanwe, ọnọdụ MIMO, na ihe ndị akọwapụtara.
Ihe na-esote bụ maapụ akụrụngwa ugboro ugboro
Eserese dị n'elu bụ maapụ akụrụngwa ugboro ugboro nke na-egosi n'ọtụtụ data LTE.Ka anyị were nkenke kwuo maka ngụkọ ọnụ ọgụgụ kacha elu 5G na ya.
2. ngụkọta nke NR downlink ọnụ ọgụgụ kasị elu
Akụrụngwa dị na ngalaba ugboro
Na 5G NR, a kọwapụtara ngalaba nhazi oge PRB nke ọwa data dị ka ndị na-ebu sub-12 (dị iche na LTE).Dị ka usoro 3GPP si dị, 100MHz bandwit (30KHz sub-carrier) nwere 273 PRB dị, nke pụtara na NR nwere 273 * 12 = 3276 sub-ebu na ngalaba ugboro.
Akụrụngwa dị na ngalaba oge
Ogologo oge nke oghere dị ka LTE, ka 0.5ms, ma na oge ọ bụla oghere, e nwere 14 OFDMA akara, na-atụle na ụfọdụ akụ kwesịrị iji zipu mgbaàmà ma ọ bụ ihe ụfọdụ, e nwere gburugburu 11 akara na. enwere ike iji ya mee ihe maka nnyefe, nke a pụtara na ihe dịka 11 n'ime 14 ndị na-ebu otu ugboro a na-ebufe n'ime 0.5ms ka a na-eji bufee data.
N'oge a, 100MHz bandwit (30KHz subcarrier) na 0.5ms nnyefe bụ 3726*11=36036
Nhazi etiti (2.5ms okpukpu abụọ n'okpuru)
Mgbe ejiri okirikiri 2.5ms ahazi ihe owuwu etiti, oge oghere subframe pụrụ iche bụ 10: 2: 2, yana enwere (5 + 2 * 10/14) oghere downlink n'ime 5ms, yabụ ọnụ ọgụgụ nke oghere downlink kwa millisecond. bụ 1.2857.1s=1000ms, yabụ enwere ike ịhazi oghere 1285.7 downlink n'ime 1s.N'oge a, ọnụ ọgụgụ nke ndị na-ebu ụgbọ ala ejiri maka nhazi nhazi ala bụ 36036*1285.7
Otu onye ọrụ MIMO 2T4R na 4T8R
Site na teknụzụ multi-antena, ndị ọrụ mgbaàmà nwere ike ịkwado nnyefe data ọtụtụ iyi n'otu oge.Ọnụ ọgụgụ kachasị elu nke iyi data downlink na uplink maka otu onye ọrụ dabere na ọnụ ọgụgụ dị ntakịrị nke ọkwa nnabata ọdụ na UE na-enweta ọkwa, nke nkọwa protocol machibidoro ya.
Na 64T64R nke ọdụ ọdụ, 2T4R UE nwere ike ịkwado nnyefe data iyi 4 n'otu oge.
Ụdị protocol R15 dị ugbu a na-akwado oke nke 8;ya bụ, ọnụ ọgụgụ kachasị elu nke SU-MIMO layers kwadoro n'akụkụ netwọk bụ 8 n'ígwé.
Mgbanwe usoro dị elu 256 QAM
Otu ụgbọ ala nwere ike ibu 8 bit.
Na nchikota, ngụkọ siri ike nke ọnụ ọgụgụ kacha elu nke echiche downlink:
Otu onye ọrụ: MIMO2T4R
273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s
Otu onye ọrụ: MIMO4T8R
273*12*11*1.2857*1000*8*8≈2.97Gb/s
Oge nzipu: Eprel-26-2021