4G vs 4G Plus
LTE-Advance (Tshaj 10 ntawm 3GPP) thiab WiMAX Tso 2 (IEEE 802.16m) raug xa mus ua 4G lossis 4th Generation Wireless Mobile Broadband technologies, los ntawm ITU-R (International Telecommunication Union - Radio Communication Sector) raws li IMT Advance xav tau. Txawm li cas los xij, LTE (Tshiab 8 ntawm 3GPP) thiab Mobile WIMAX (IEEE 802.16e) tes hauj lwm tau muag ntau heev los ntawm Mobile broadband cov chaw muab kev pabcuam li 4G. Ib yam li ntawd, Kev Txhim Kho ntawm LTE-Advance (Tshaj 11, 12, 13) technologies ib txwm hu ua 4G ntxiv. Txij li cov chaw muab kev pabcuam twb tau ua lag luam LTE - Tso tawm 8 raws li 4G, tam sim no lawv tab tom ua lag luam LTE-Advance (R10 thiab dhau mus) ua 4G ntxiv.
4G yog dab tsi?
Raws li lub Peb Hlis 2008, cov npe ntawm cov kev cai tsim los ntawm ITU-R los ntawm IMT-Advanced specification rau kev ua 4G tus neeg sib tw tshuab suav nrog cov xwm txheej xws li ncov Cov Ntaub Ntawv Ceev ntawm 1 Gbps rau cov neeg taug kev thiab cov neeg siv nyob ruaj khov thiab 100 Mbps thaum siv Nyob rau hauv ib puag ncig kev txav siab, Spectral efficiency rau DL 15-bps / Hz thiab 6.75 bps / Hz rau UL, thiab Cell Edge spectral efficiency ntawm 2.25 bps / Hz / cell. Thaum pib, lawv tau lees paub LTE-Advance (Tshwm Sim 10) thiab WiMAX Release 2 (IEEE 802.16m) raws li qhov tseeb 4G, txij li lawv tau ua raws li IMT Ua Ntej cov cai. LTE-Advance (Tshiab 10) ua tiav DL - 1 Gbps, UL - 500 Mbps thiab DL - 30 bps / Hz, UL - 15 bps / hz spectral efficiency. Cov ntaub ntawv tus nqi thiab spectral efficiency lub hom phiaj yog qhov tseem ceeb hauv IMT-Advance specification. Txawm li cas los xij, LTE, WiMAX, DC-HSPA + thiab lwm yam thev naus laus zis ua ntej 4G tom qab suav tias yog 4G los ntawm ITU-R hauv Geneva, thaum Lub Kaum Ob Hlis 6, 2010, txiav txim siab ntau theem ntawm kev txhim kho hauv kev ua tau zoo thiab kev muaj peev xwm nrog kev hwm rau thawj lub cim thib peb cov tshuab xa mus rau lub hnub. Tsis tas li ntawd, ITU-R tau hais tias, cov ncauj lus qhia ntxaws ntxaws tshiab ntawm IMT-Advanced thev naus laus zis yuav raug muab rau thaum ntxov 2012. Txawm li cas los xij, nws tsis tau raug hloov kho tam sim no, yog li thawj IMT-Advance yuav tsum tau ua rau lub Peb Hlis 2008, sawv mus txog rau hnub tim.
Hauv cov chaw muab kev pabcuam pom, LTE tau ua raws ntau yam ntawm IMT-Advance cov cai xws li Txhua tus IP PS sau, tsis yog rov qab siv tau nrog cov txheej txheem thib 3 ua ntej thiab muaj peev xwm nthuav tawm cov cuab yeej tshiab, cuam tshuam nrog cov qauv wireless uas twb muaj lawm., dynamically sib qhia thiab siv cov kev pab cuam network los txhawb ntau tus neeg siv ib txhij ntawm ib lub xov tooj. Li no, lawv sib cav thiab ua lag luam LTE li 4G. Hauv kev saib pej xeem, LTE tuaj yeem suav tau yooj yim raws li 4G thev naus laus zis.
4G Plus yog dab tsi?
Los ntawm ITU-R pom, 4G ntxiv yog suav tias yog dhau LTE-Advance (Tshaj 10), xws li 3GPP Tso Tawm 11, 12 thiab 13. Tseem tag nrho cov kev tso tawm tom qab R10 siv tib lub hauv paus network. architecture thiab xov tooj cua technologies, tsuas yog nrog kev txhim kho muab los ntawm cov kev tso tawm tshiab. Tsis tas li ntawd, lawv tag nrho rov qab sib xws nrog R10. Hauv kev tso tawm 11, nws txhawb nqa Carrier Aggregation (CA) ntawm ob Lub Cev Muaj Peev Xwm (CC) rau ob qho tib si UL & DL, thiab tsis sib thooj CC rau Carrier Aggregation. UL & DL Coordinated Multi-Point (CoMP) thev naus laus zis kuj tau ntxiv rau hauv R11, ntxiv rau Inter Cell Interference Cancellation (ICIC) kev txhim kho thiab Cell Edge throughput enhancements. Hauv R12 thiab R13, nws tau txhim kho kev sib txuas ntxiv hauv kev sib txuas tsis sib txuas & Inter Bands, uas tau dhau los ua kev lag luam hauv kev lag luam, txij li tsis muaj cov khoom sib txuas rau cov tswv lag luam.
Los ntawm Tus Muab Kev Pabcuam qhov kev xav, LTE-Advance (R10 thiab dhau mus) raug txiav txim siab thiab ua lag luam raws li 4G ntxiv, txij li lawv tau hu ua LTE (R8) ua 4G.
Qhov txawv ntawm 4G thiab 4G Ntxiv yog dab tsi?
• Raws li ITU-R qhov kev xav, LTE-Advance (Tshiab 10), uas yog tag nrho ua raws li IMT-Advance Specifications, yog branded li 4G, qhov twg nws muab cov ntaub ntawv ncov ntawm 1 Gbps rau Cov neeg siv nyob ruaj ruaj, Carrier Aggregation nrog 2 Contiguous Intra band Component carriers, thiab 8 × 8 MIMO.
• Meanwhile, Tso tawm 11 thiab tshaj li thev naus laus zis xws li Non-Contiguous Inter & Intra Band Carrier Aggregation mus txog tsib tus neeg nqa khoom (txog 100 Mhz ntawm Bandwidth), UL / DL CoMP, Enhanced ICIC thiab txhim kho Cell Edge throughput raug suav hais tias yog 4G ntxiv rau thev naus laus zis.
• Raws li Tus Muab Kev Pabcuam Pom Zoo, LTE - Tso Tawm 8 yog suav tias yog 4G qhov uas nws tuaj yeem txhawb nqa siab tshaj DL / UL cov ntaub ntawv tus nqi ntawm 300/75 Mbps, 4 × 4 MIMO, siab kawg ntawm 20Mhz bandwidth ntawm ib lub xov tooj.. LTE-Advance (R10 thiab tshaj) thev naus laus zis tau ua lag luam raws li 4G ntxiv.
Nyeem ntxiv:
- Qhov txawv ntawm 3G thiab 4G Network Technology
- Qhov txawv ntawm 4G thiab Wifi
