G.hn (Gigabit Home Networking)yog ib qho kev sib txuas xov tooj zoo tshaj plaws nyob rau hauv International Telecommunication Union (ITU-T) tsim los kom ua tiav siab - cov ntaub ntawv xa xov ceev uas siv cov xaim uas twb muaj lawm hauv cov tsev. Nws tsis yog ib qho tshiab cabling system, tab sis theej "enabling" thev naus laus zis uas hloov cov kab hluav taws xob hauv tsev, kab xov tooj, thiab cov coaxial cables rau hauv lub zog, siab -ceev network qaum. Nws raug suav hais tias yog ib qho ntawm cov kev daws teeb meem zoo tshaj plaws rau kev daws cov teeb meem ntawm cov kev pabcuam niaj hnub hauv tsev.
Lub hauv paus ua haujlwm tseem ceeb: Hloov cov xov hlau rau hauv Network Cables
G.hn thev naus laus zis tuaj yeem hloov cov kab hluav taws xob tsis zoo rau hauv siab - txoj hauv kev nrawm nrawm, feem ntau vim nws peb lub hauv paus thev naus laus zis:OFDM kev hloov kho, advanced yuam kev kho mechanisms, thiabUa haujlwm tau zoo Media Access Control (MAC) .
1. Lub Cev Txheej Txheem Lub Cev: OFDM Modulation Technology
Cov kab hluav taws xob hauv tsev tsis yog tsim los rau kev xa cov ntaub ntawv; lawv ua rau cov teeb liab attenuation, cuam tshuam, thiab suab nrov.G.hntackles qhov kev sib tw ntawm lub cev txheej los ntawm kev ua haujlwmOrthogonal Frequency Division Multiplexing (OFDM)tshuab.
Multi-kab kis tau tus mob:Lub tswv yim tseem ceeb ntawm OFDM yog cais qhov siab - cov ntaub ntawv ceev ceev mus rau ntau qhov sib npaug qis - cov ntaub ntawv ceev ceev, txhua qhov hloov pauv mus rau ntau qhov sib koom ua ke orthogonal subcarriers rau kev sib kis. Ib qho piv txwv yog rhuav tshem lub tsheb loj thauj khoom tag nrho (qhov siab - cov ntaub ntawv ceev) mus rau ntau lub tsheb me (cov subcarriers) thauj lawv ib txhij.
Suab nrov thiab cuam tshuam tsis kam:Qhov kom zoo dua ntawm txoj kev no yog tias txawm tias qee qhov subcarriers siv tsis tau vim muaj suab nrov lossis teeb liab attenuation (xws li, cuam tshuam los ntawm cov khoom siv), lwm cov subcarriers tuaj yeem txuas ntxiv xa cov ntaub ntawv. Lub kaw lus tseem tuaj yeem kaw cov subcarriers hauv kev cuam tshuam ntau zaus (lub npe hu ua "notching") kom tsis txhob cuam tshuam nrog cov kev pabcuam hauv xov tooj cua xws li kev tshaj tawm xov xwm luv luv, ua kom muaj kev ruaj ntseg ntawm nws tus kheej kev sib txuas.
Kev siv ntau zaus Band:G.hn thev naus laus zis feem ntau siv ntau zaus ntawm 1.8 MHz mus rau 100 MHz lossis dav dua, ua tiav cov txheej txheem lub cev (PHY) txog li 1 Gbps lossis 2 Gbps los ntawm kev siv cov peev txheej spectrum zoo.
2. Ua kom ntseeg tau cov ntaub ntawv: LDPC yuam kev kho coding
Cov kab hluav taws xob ib puag ncig yog raug rau lub suab nrov impulse (piv txwv li, los ntawm lub cev muaj zog startups), uas tuaj yeem ua rau tawg yuam kev hauv cov ntaub ntawv. G.hn ntiav Forward Error Correction (FEC) technology hu uaTsawg-Density Parity-Kuaj (LDPC) cov lej.
Proactive yuam kev kho:LDPC yog cov txheej txheem coding siab heev uas mus txog Shannon txwv. Lub transmitter ntxiv redundant check ntaub ntawv rau cov ntaub ntawv. Txawm hais tias tus neeg txais tau txais ib feem ntawm cov ntaub ntawv corrupted, nws tuaj yeem siv cov ntaub ntawv txheeb xyuas no thiab cov haujlwm ua lej kom ncaj qha rov qab cov ntaub ntawv qub, tsis tas yuav thov kev xa rov qab los ntawm tus xa. Qhov no zoo heev txhim kho kev sib kis tau zoo, txo qis latency tshwm sim los ntawm kev xa rov qab, thiab ua kom cov smoothness ntawm tiag -siv sij hawm xws li video streaming.
3. Network Coordination Mechanism: TDMA thiab CSMA
Media Access Control (MAC) txheej ntawm G.hn siv cov txheej txheem sib koom ua ke feem ntau raws liTime Division Multiple Access (TDMA), supplemented los ntawmCarrier Sense Multiple Access with Collision Avoidance (CSMA/CA) .
Guaranteeing Quality of Service (QoS):Rau latency- cov ntawv thov nkag siab zoo li video thiab lub suab, Domain Master (lub luag haujlwm sib koom tes hauvG.hnnetwork) siv TDMA txhawm rau khaws lub sijhawm sib kis tau zoo rau cov ntaub ntawv ntws, ua kom lawv tau txais kev lees paub bandwidth thiab qis latency, thiab zam kev sib tsoo.
Ua kom cov ntaub ntawv tawg:Rau cov ntaub ntawv tsis tu ncua, CSMA / CA txoj kev tuaj yeem siv tau, qhov nodes mloog cov channel ua ntej xa thiab tsuas yog xa thaum nws tsis ua haujlwm, yog li tswj hwm tag nrho cov kev sib txuas hauv network.
Evolution thiab Enhancement: Los ntawm Wave 1 mus rau Wave 2
G.hn thev naus laus zis txuas ntxiv mus, nrog rau kev lag luam tseem ceeb tam sim no muab qhov muaj zog duaWave 2txheem.
G.hn Wave 1:Thawj tus qauv - tiam, nrog qhov siab tshaj PHY tus nqi txog li 1 Gbps thiab cov txiaj ntsig tau zoo ntawm ib puag ncig 500 Mbps nyob rau hauv cov xwm txheej zoo.
G.hn Wave 2:Qhov thib ob - tiam txheej txheem txhawb PHY tus nqi mus rau 2 Gbps los ntawm kev txuas cov zaus band thiab optimizing coding, ua tau raws li qhov xav tau ntawm daim ntawv thov xws li 8K video streaming, VR / AR gaming, thiab siab - hloov ntaub ntawv ceev. Wave 2 kuj qhia txog Quick Noise Adaptation (QNA) thev naus laus zis, uas tshawb pom thiab hloov kho lub suab nrov mus txog 5 npaug sai dua li cov tiam dhau los, txo qis latency thiab txhim kho kev ua haujlwm ruaj khov hauv qhov chaw cuam tshuam nyuaj.
Qhov zoo tshaj plaws thev naus laus zis: MIMO thiab Hla -Theem kis
G.hn (tshwj xeeb tshaj yog tus qauv Wave 2) feem ntau ua haujlwmNtau -Input Multiple-Output (MIMO)technology, uas yog qhov tseem ceeb rau nws cov kev ua tau zoo tshaj cov qauv qub.
Multi-Txoj kev kis tau tus mob:Cov kab hluav taws xob sib txuas lus ib txwm siv (xws li HomePlug thaum ntxov) feem ntau tsuas yog siv ib khub ntawm cov xov hlau (nyob thiab nruab nrab) rau ib leeg -Input Ib Leeg- Tso zis (SISO) kis. Hauv qhov sib piv, G.hn MIMO tuaj yeem siv peb cov xov hlau (nyob, nruab nrab, thiab Lub Ntiaj Teb) ntawm lub tsev hluav taws xob los tsim ntau yam kev sib kis. Qhov no zoo ib yam li kev nthuav dav ib - txoj kev mus rau hauv ntau txoj kev - txoj kab kev loj, ua kom cov ntaub ntawv nce ntxiv thiab ruaj khov.
Kev daws qhov Hla -Phase Challenge:Hauv cov tsev nyob, cov chav sib txawv yuav nyob ntawm cov theem hluav taws xob sib txawv. Cov thev naus laus zis qub tawm tsam rau cov teeb liab hla cov theem, ua rau kev poob qis hauv lub network.G.hnMIMO thev naus laus zis siv tau zoo siv ntau- kab cim kab lus kom ua tiav kev sib txuas lus zoo ntawm cov theem sib txawv, nthuav dav qhov kev ntseeg siab thiab ntau yam kev pab cuam hauv network.
Kev sib piv nrog lwm yam technologies
Nco tseg:Piv nrog rau cov thev naus laus zis Wi-Fi thev naus laus zis, G.hn fais fab kab kev daws teeb meem zoo dua rau kev daws teeb meem teeb meem tom qab cov teeb liab hla ntawm phab ntsa, muab kev sib txuas ruaj khov dua.
Daim ntawv thov Scenario
Nrog nws cov kev kub ceev, tsis tshua muaj latency, kev ruaj ntseg siab, thiab muaj peev xwm ua kom muaj kev sib txuas uas twb muaj lawm, G.hn thev naus laus zis tau siv dav hauv ntau qhov chaw:
Tsev Networks:Tshem tawm Wi-Fi qhov chaw tuag, muab kev ruaj khov, siab -kev sib txuas ceev ceev rau cov khoom siv xws li TVs ntse, game consoles, IPTV teeb- saum lub thawv, thiab PCs.
Kev Lag Luam Extensions:Hauv chaw ua haujlwm, tsev so, chav tsev, thiab lwm yam, txuas ntxiv kev nkag mus rau txhua chav tsev yam tsis tas yuav tsum muaj kev tsim kho, thaum muab kev ruaj ntseg network rau cov qhua.
Industrial thiab IoT:Nyob rau hauv daim ntawv thov xws li ntse elevators, hluav taws xob tsheb them chaw nres tsheb, thiab ntse ntsuas, siv fais fab kab rau ntaus ntawv cov ntaub ntawv backhaul thiab tswj, zam tus nqi siab ntawm nteg cov kev sib txuas lus cables nyob rau hauv complex ib puag ncig.
