Xisaabinta heerka ugu sarreeya ee soo dejinta 5G

1. Fikradaha aasaasiga ah

Iyada oo ku saleysan tignoolajiyada asalka ah ee LTE (Kobcinta Muddada Dheer), nidaamka 5G NR wuxuu qaataa qaar ka mid ah tignoolajiyada cusub iyo naqshadaha.5G NR kaliya ma dhaxlo OFDMA (Orthogonal Frequency-Division Multiple Access) iyo FC-FDMA ee LTE balse waxa ay dhaxlaan tignoolajiyada anteenada badan ee LTE.Socodka MIMO waa ka badan yahay LTE.Habaynta, MIMO waxa ay taageertaa xulashada la qabsiga ee QPSK (Qaybta Soo noqnoqoshada Orthogonal-Qaybta Multiple Access), 16QAM (16 qaabaynta cabbirka laba-geesoodka ah ee heer-sare ah), 64QAM (64-xajmiga cabbir-xaruneed ee heer-sare ah), iyo 256 QAM (256 cabbir heer-sare ah habaynta).

Nidaamka NR, sida LTE, wuxuu si dabacsanaan ah u qoondayn karaa wakhtiga iyo inta jeer ee bandwidth iyada oo loo marayo qaybinta soo noqnoqda iyo kala qaybinta wakhti-qaybinta.Laakin si ka duwan LTE, NR-gu waxa uu taageeraa ballaadhka doorsoomayaasha-hoosaadka, sida 15/30/60/120/240KHz.Xaddiga xadhkaha qaada ee ugu badan ee la taageeray ayaa ka sarreeya LTE, sida ka muuqata shaxanka hoose:

Xisaabinta aragtiyeed ee qiimaha ugu sarreeya ee NR waxay la xiriirtaa bandwidth, qaabka qaabaynta, qaabka MIMO, iyo cabbirro gaar ah.

Kuwa soo socda waa khariidadda kheyraadka waqtiga-soo noqnoqda

Jaantuska kore waa khariidadda kheyraadka waqtiga-soo noqnoqda oo ka muuqata xog badan oo LTE ah.Oo aan si kooban uga hadalno xisaabinta xisaabinta heerka ugu sarreeya ee 5G iyada oo la adeegsanayo.

2. xisaabinta heerka ugu sarreeya ee NR downlink

Ilaha laga heli karo qaybta soo noqnoqda

Gudaha 5G NR, cutubka jadwalka aasaasiga ah ee PRB ee kanaalka xogta waxaa lagu qeexay sida 12-hoosaadyo (ka duwan LTE).Marka loo eego borotokoolka 3GPP, 100MHz bandwidth (30KHz sub-carrier) waxa uu leeyahay 273 PRB-yada la heli karo, taas oo macnaheedu yahay in NR uu leeyahay 273*12=3276-xambaarayaal-hoosaadyada qaybta soo noqnoqda.

Ilaha la heli karo ee goobta wakhtiga

Dhererka boosku wuxuu la mid yahay LTE, weli waa 0.5ms, laakiin mar kasta booska, waxaa jira 14 calaamadood oo OFDMA ah, iyadoo la tixgelinayo in kheyraadka qaar loo baahan yahay in loo isticmaalo si loo diro signal ama waxyaabo, waxaa jira ilaa 11 calaamad waxaa loo isticmaali karaa gudbinta, tani waxay ka dhigan tahay in ku dhawaad ​​11 ka mid ah 14-side-hoosaadyo isku mid ah oo lagu kala qaado 0.5ms gudahooda loo isticmaalo gudbinta xogta.

Waqtigaan, 100MHz bandwidth (30KHz subcarrier) ee gudbinta 0.5ms waa 3726*11=36036

Qaab dhismeedka qaab-dhismeedka (2.5ms laba wareeg oo hoose)

Marka qaab-dhismeedka qaab-dhismeedka lagu habeeyo wareegga labanlaaban ee 2.5ms, saamiga wakhti-hoosaadka gaarka ah waa 10: 2: 2, waxaana jira (5 + 2 * 10/14) hoos-u-dhisyada 5ms gudahooda, markaa tirada hoos-u-dhisyada halkii millise seconds. wuxuu ahaa 1.285 $.1s=1000ms, marka 1285.7 waqti hoos u dhigista waxaa lagu jadwalsan karaa 1s gudahood.wakhtigan, tirada shirkadaha-hoosaadka loo isticmaalo jadwalka hoos u dhigista waa 36036*1285.7

Isticmaale keli ah MIMO 2T4R iyo 4T8R

Iyadoo loo marayo tiknoolajiyada anteenada badan, isticmaalayaasha calaamaduhu waxay taageeri karaan gudbinta xogta badan ee isku mar.Tirada ugu badan ee durdurrada xogta hoose iyo kor u qaadida ee hal isticmaale waxay ku xidhan tahay tirada yar ee lakabyada soo dhawaynta saldhiga iyo UE waxay helaysaa lakabyo, oo ay xaddiday qeexida borotokoolka.

64T64R ee saldhiga saldhiga, 2T4R UE waxay taageeri kartaa ilaa 4 gudbinta xogta isku mar.

Nooca borotokoolka R15 ee hadda jira wuxuu taageeraa ugu badnaan 8 lakab;taas oo ah, tirada ugu badan ee lakabyada SU-MIMO ee lagu taageeray dhinaca shabakada waa 8 lakab.

Hababka sare ee nidaamka 256 QAM

Hal baabuur-hoosaadka ayaa qaadi kara 8 bits.

Marka la soo koobo, xisaabin adag oo ah heerka ugu sarreeya ee aragtida hoose:

Hal isticmaale: MIMO2T4R

273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s

Hal isticmaale: MIMO4T8R

273*12*11*1.2857*1000*8*8≈2.97Gb/s