Pab pawg neeg ua haujlwm tau pib ua haujlwm ntawm tus qauv rov qab rau xyoo 2014 thiab tam sim no ua haujlwm ntawm cov qauv 3.0. Nws yog qhov txawv me ntsis ntawm cov tiam dhau los ntawm 802.11 tus qauv, vim tias muaj tag nrho cov haujlwm tau ua tiav hauv ob daim ntawv sau. Qhov no tshwm sim vim muaj ntau yam kev hloov pauv uas tau npaj tseg, uas yuav tsum tau ua kom paub meej ntxiv thiab kev sim ua kom sib haum xeeb. Pab pawg thawj zaug kev sib tw yog txhawm rau txhim kho spectral efficiency kom muaj peev xwm ntawm WLANs nrog qhov ceev ntawm cov neeg siv khoom noj thiab cov ntsiab lus nkag. Cov tsav tsheb tseem ceeb rau kev txhim kho tus qauv yog: nce tus naj npawb ntawm cov neeg siv xov tooj ntawm tes, kev tshaj tawm hauv kev sib raug zoo (tseem ceeb rau kev thauj mus los) thiab, tau kawg, IoT.
Schematically, innovation zoo li no:
MIMO 8x8, ntau qhov kwj deg
Yuav muaj kev txhawb nqa rau MIMO 8x8, mus txog 8SS (Spatial Stream). Tus qauv 802.11ac kuj tau piav qhia txog kev txhawb nqa rau 8 SS hauv txoj kev xav, tab sis hauv kev xyaum, 802.11ac "wave 2" cov ntsiab lus nkag tau txwv rau kev txhawb nqa 4 spatial kwj. Raws li, cov ntsiab lus nkag tau txhawb nqa MIMO 8x8 yuav tuaj yeem ua haujlwm ib txhij txog 8 1x1 cov neeg siv khoom, plaub 2x2 cov neeg siv khoom, thiab lwm yam.
MU-MIMO DL / UL (Multi-User MIMO Downlink / Uplink)
Kev txhawb nqa ib txhij rau multiuser hom rau ob qho tib si rub tawm thiab upload cov channel. Qhov muaj peev xwm ntawm kev sib tw ib txhij nkag mus rau cov channel upload, kev sib koom ua ke ob hnub thiab kev tswj hwm yuav txo qis "cov nyiaj siv ua haujlwm", uas yuav ua rau muaj kev nce ntxiv thiab txo lub sijhawm teb.
Ntev OFDM cim
OFDM tau ua haujlwm hauv 802.11a/g/n/ac cov qauv rau ~ 20 xyoo yam tsis muaj kev hloov pauv. Raws li tus qauv, ib channel nrog qhov dav ntawm 20MGz muaj 64 subcarriers sib nrug ntawm ib leeg nrog lub sijhawm ntawm 312,5 kHz (20MHz)./64). Txij li thaum lub semiconductor kev lag luam tau nce ntau heev nyob rau lub sijhawm no, 802.11x muab 4-fold nce hauv subcarriers rau 256, nrog lub sijhawm nruab nrab ntawm subcarriers ntawm 78,125 kHz. OFDM cim ntev (lub sij hawm) yog inversely proportional rau lub zaus, thiab raws li nws kuj yuav nce 4 zaug ntawm 3,2 ΞΌs rau 12,8 ΞΌs. Qhov kev txhim kho no yuav ua rau kom muaj txiaj ntsig thiab kev ntseeg tau ntawm kev xa cov ntaub ntawv, tshwj xeeb tshaj yog nyob rau hauv "sab nraum zoov" WLAN.
Kev Ncua Sijhawm
Cov txiaj ntsig tshiab rau kev tiv thaiv lub sijhawm nruab nrab ntawm cov thav ntawv tau ntxiv, uas tam sim no tuaj yeem sib npaug ntawm 1,6 Β΅s thiab 3,2 Β΅s rau "sab nraum zoov" WLAN; rau "hauv tsev" lub caij nyoog yog tshuav ntawm 0,8 Β΅s. Cov hom ntawv pob ntawv tshiab nrog kev ntseeg siab dua (ntev) preamble. Tag nrho cov saum toj no yuav tso cai rau koj mus txog 4-fold nce nyob rau hauv kev twb kev txuas ceev ntawm lub network ntug.
OFDMA DL/UL (Orthogonal Frequency Division Multiple Access)
Ib qho kev hloov pauv loj yog kev qhia txog OFDMA es tsis yog OFDM. OFDMA thev naus laus zis tau siv hauv LTE tes hauj lwm thiab tau ua pov thawj tias muaj txiaj ntsig zoo. Qhov txawv yog tias thaum xa hauv OFDM, tag nrho cov zaus channel tau nyob thiab kom txog thaum kev sib kis xaus, tus neeg siv khoom tom ntej tsis tuaj yeem tuav cov khoom siv zaus. Hauv OFDMA, qhov teeb meem no tau daws los ntawm kev faib cov channel rau hauv subchannels ntawm qhov dav sib txawv, lub npe hu ua RU (Resource Units). Hauv kev xyaum, qhov no yuav txhais tau tias 256 subcarriers ntawm 20MHz channel tuaj yeem muab faib ua RUs ntawm 26 subcarriers. Txhua RU tuaj yeem muab tso rau nws tus kheej MCS coding tswvyim, nrog rau kev xa hluav taws xob.
Zuag qhia tag nrho, qhov no yuav ua rau muaj kev nce ntxiv hauv lub peev xwm hauv lub network tag nrho, nrog rau kev nkag mus rau txhua tus neeg siv khoom.
1024 QAB
Ntxiv MCS tshiab (Modulation thiab Coding Sets) 10 thiab 11 rau 1024-QAM modulation. Ntawd yog, tam sim no ib tus cwj pwm hauv cov tswv yim no yuav nqa 10 cov ntaub ntawv, thiab qhov no yog 25% nce piv rau 8bit hauv 256-QAM.
TWT (Target Wake Time) - βUp Link resource schedulingβ
Lub zog txuag hluav taws xob uas tau ua pov thawj nws tus kheej hauv 802.11ah tus qauv thiab tam sim no tau hloov mus rau 802.11ax. TWT tso cai rau cov ntsiab lus nkag los qhia cov neeg siv thaum twg nkag mus rau hom kev txuag hluav taws xob thiab muab lub sijhawm rau thaum twg yuav sawv los txais lossis xa cov ntaub ntawv. Cov no yog lub sijhawm luv luv, tab sis tuaj yeem pw tsaug zog ntau lub sijhawm luv luv yuav ua rau muaj qhov sib txawv loj rau roj teeb lub neej. Txo "kev sib cav" thiab kev sib tsoo ntawm cov neeg siv khoom yuav ua rau kom lub sij hawm siv hauv kev txuag hluav taws xob. Nyob ntawm seb hom kev khiav tsheb, kev txhim kho hauv kev siv hluav taws xob tuaj yeem nyob ntawm 65% mus rau 95% (raws li kev ntsuam xyuas Broadcom). Rau cov khoom siv IoT, TWT kev txhawb nqa yog qhov tseem ceeb.
BSS Xim - Spatial Reuse
Txhawm rau kom muaj peev xwm ntawm WLAN kev sib txuas siab ceev, nws yog ib qho tsim nyog yuav tsum tau ua kom cov khoom siv channel rov siv tau ntau zaus. Txhawm rau txo qis kev cuam tshuam ntawm cov neeg nyob sib ze BSSs ua haujlwm ntawm tib lub channel, nws tau thov kom kos lawv nrog "xim-ntsis". Qhov no yuav tso cai rau koj los hloov kho CCA (kev ntsuam xyuas meej meej) rhiab heev thiab lub zog xa hluav taws xob. Kev muaj peev xwm ntawm lub network yuav nce ntxiv vim qhov kev npaj ua kom sib haum, thaum cov kev cuam tshuam uas twb muaj lawm yuav muaj kev cuam tshuam tsawg dua rau kev xaiv MCS.
Vim qhov kev hloov tshiab tom ntej ntawm cov qauv kev nyab xeeb rau , tsis yog txhua tus yuav tuaj yeem daws teeb meem kev nyab xeeb nrog kev hloov kho software yooj yim, yog li Extreme Networks yuav qhia cov ntsiab lus nkag nrog kho vajtse txhawb rau 2018ax thiab WPA802.11 hauv lub quarter thib plaub ntawm 3.
Xav paub ntxiv txog .
Tau qhov twg los: www.hab.com