G.hn EoC Technology: Ib Txoj Kev Sib Koom Tes Ntawm Cov Qauv Txheej Txheem Thoob Ntiaj Teb thiab Hauv Zos Network Architectures
Ntawm nws qhov tseem ceeb, G.hn EoC thev naus laus zis sawv cev rau kev tsim kho tshiab uas ua ke nrog tus txheej txheem thoob ntiaj teb (ITU-T G.hn) nrog lub zos network architecture (EoC). Tus yuam sij rau nws cov txheej txheem technical thiab kev ua tau zoo yog nyob rau hauv nws cov txheej txheem txheej txheem txheej txheem.
G.hn EoC tsis yog tus qauv kev ywj pheej thoob ntiaj teb. Hloov chaw, nws yog ib txoj hauv kev tau txais los ntawm Tuam Tshoj txoj kev lag luam tshaj tawm hauv TV (thiab lwm tus) los daws qhov "kawg 100 meters" coaxial cable nkag teeb meem. Nws siv lub cev txheej (PHY) thev naus laus zis los ntawm ITU-T G.hn tus qauv sib txuas hauv tsev thiab siv rau Ethernet tshaj Coax (EoC) nkag mus rau hauv network architecture. Los ntawm leveraging tus qauv paub tab, nws zam tsis dhau R & D thiab ua kom muaj kev lag luam sai thiab sib cuam tshuam.
Lub hauv paus ntsiab lus tseem ceeb: Ib qho kev sib koom ua ke
Lub hauv paus tseem ceeb ntawm G.hn EoC system nyob hauv kev sib txuas ntawm EPON (Ethernet Passive Optical Network) Media Access Control (MAC) txheej nrog G.hn PHY txheej.
Upper txheej: EPON MAC- Nws siv EPON raws tu qauv, paub rau cov neeg ua haujlwm, raws li cov ntaub ntawv txuas txheej. Qhov no tso cai rau G.hn EoC system ua haujlwm sib cuam tshuam nrog cov khoom siv hluav taws xob EPON / GPON kho qhov muag, ua kom muaj kev sib koom ua ke kev tswj hwm thiab kev ua haujlwm.
Txheej hauv qab: G.hn PHY- Lub luag haujlwm rau lub teeb liab kis tau zoo tshaj qhov nruab nrab coaxial cable, qhov no yog lub hauv paus ntawm nws cov kev ua tau zoo tshaj.
Sib sib zog nqus dhia mus rau hauv lub cev txheej: Lub hauv paus ntawm kev ua tau zoo
Qhov zoo tshaj plaws ntawm G.hn PHY yog qhov laj thawj tseem ceeb vim li casG.hn EoCtechnology ua tiav high bandwidth thiab muaj zog tiv thaiv kev cuam tshuam muaj peev xwm.
Core Modulation thiab Coding Technologies
PHY tau txais kev sib xyaw ua ke ntawm cov thev naus laus zis dav dav lees paub tias yog nce qhov kev txwv kev ua haujlwm theoretical:
OFDM (Orthogonal Frequency Division Multiplexing) kev hloov pauv- Qhov no yog qhov tseem ceeb ntawm nws txoj kev sib kis ceev. OFDM faib cov kis tau tus mob mus rau ntau lub orthogonal narrowband sub-channels, splitting ib tug high-ceev cov ntaub ntawv kwj mus rau hauv ntau low-speed data kwj kis nyob rau hauv parallel ntawm cov sub-channels. Qhov kev tsim no muaj txiaj ntsig zoo tiv thaiv kev cuam tshuam ntau txoj hauv kev thiab ntau zaus xaiv fading hauv coaxial cable raws, zoo heev txhim kho spectral efficiency thiab kis tau tus mob.
LDPC (Low-Density Parity-Check) rau kev kho qhov yuam kev- Raws li cov txheej txheem coding channel uas mus txog qhov txwv Shannon, LDPC cov lej muaj peev xwm kho qhov yuam kev muaj peev xwm, muaj txiaj ntsig zoo nrog cov suab nrov ib puag ncig thiab ua kom muaj kev sib txuas lus zoo ntawm kev kub ceev. Lub hom phiaj tseem ceeb ntawm tus encoder no yog tswj xyuas qhov kev ua tau zoo ntawm kev kho qhov yuam kev nyob rau hauv high-rate kis tau tus mob.
Key PHY Parameters thiab Performance
Nrog kev hloov pauv tas mus li, PHY kev ua tau zoo ntawm G.hn thev naus laus zis tau txhim kho zoo heev:
Kev khiav hauj lwm zaus band thiab modulation muaj peev xwm- Tus qauv G.hn qub (G.9960) txhais tau tias PHY txhawb nqa txog 200 MHz bandwidth, nrog rau txhua tus OFDM subcarrier muaj peev xwm siv tau txog 4096-QAM kev hloov kho. Cov kev hloov kho tshiab kawg (xws li, kev hloov kho 2020) txuas ntxiv cov bandwidth mus rau ntau dua 1 GHz, ua kom muaj kev sib kis ceev mus txog 10 Gbit / s dhau coaxial cable.
Qhov tseeb kis tus nqi- Hauv ntiaj teb tiag tiag G.hn EoC cov khoom lag luam, tus nqi nyob ntawm qhov kev teeb tsa tshwj xeeb thiab cov qauv qauv.
Cov khoom thaum ntxov: Siv 100 MHz lossis 200 MHz bandwidth, lawv ua tiav PHY tus nqi ntawm 400 Mbps thiab MAC txheej txheej ntawm 350 Mbps.
Cov khoom tseem ceeb: Raws li G.hn Wave 2 thev naus laus zis, siv 200 MHz bandwidth, lawv ua tiav PHY tus nqi mus txog 2 Gbit / s thiab ua haujlwm tau zoo txog 1.7 Gbit / s.
Yam latency- Tus neeg teb xov tooj-qib latency yog qhov zoo dua. Qhov siab tshaj plaws latency feem ntau tsis ntau tshaj 10 ms, thiab qhov nruab nrab latency tuaj yeem qis li 5 ms.
Anti-interference thiab coexistence mechanisms- Tus qauv G.hn tau tsim los nrog kev sib txawv ntawm qhov chaw electromagnetic hauv siab. Tshaj li lub cev tiv thaiv txheej txheem muab los ntawm OFDM thiab LDPC, nws suav nrog:
Out-of-Band (OOB) channel- Ib qho kev sib cais qis qis tshwj xeeb rau kev tswj hwm network thiab kev hloov kho firmware ntawm lub taub hau thiab cov khoom siv, tsis cuam tshuam los ntawm cov ntaub ntawv tseem ceeb channel.
Ntshai- Lub peev xwm los txo lossis tua lub zog xa hluav taws xob hauv qee qhov zaus kom tsis txhob cuam tshuam nrog cov xov tooj cua nyiam nyiam ua haujlwm lossis lwm yam kev pabcuam muaj ntawv tso cai.
Dynamic zaus xaiv- Thaum sib koom ua ke nrog cov teeb liab hauv TV ntawm tib coaxial cable, G.hn cov cuab yeej tuaj yeem ntes RF cov cim, thiab Domain Master yuav txav mus rau kev sib txuas lus mus rau lwm qhov chaw RF kom tsis txhob cuam tshuam.
Network scale thiab kev ruaj ntseg –
Loj-muaj peev xwm networking- Ib lub npe G.hn tuaj yeem txhawb nqa txog 250 ntawm.
Advanced encryption- Txhawb 128-ntsis AES kho vajtse encryption los xyuas kom meej cov ntaub ntawv kis tau tus mob.
Summary of Key Technical Advantages
Ua tsaug rau nws cov qauv PHY siab heev,G.hn EoCmuab cov txiaj ntsig tseem ceeb tshaj li yav dhau los coaxial nkag technologies (piv txwv li, kev daws teeb meem raws li HomePlug AV):
| Feature | G.hn EoCQhov zoo |
|---|---|
| Tus nqi kis tau tus mob | PHY tus nqi nce mus txog Gbit / s (piv txwv li, 400 Mbps, 2 Gbps), deb tshaj cov thev naus laus zis thaum ntxov. |
| Anti-interference muaj peev xwm | OFDM thiab LDPC coding muab kev tiv thaiv zoo rau ntau txoj kab thiab suab nrov, ua kom muaj kev sib txuas lus siab. |
| Operator-qib kev ua haujlwm | Muab kev kwv yees qis latency (<10 ms), QoS guarantees, and support for remote management protocols such as TR‑069. |
| Standardization thiab interoperability | Ua raws li kev sib koom ua ke ITU-T tus qauv thoob ntiaj teb (G.996x series), ua kom muaj kev sib cuam tshuam ntawm cov khoom siv los ntawm cov neeg muag khoom sib txawv. |
Hauv cov ntsiab lus, G.hn EoC thev naus laus zis yog kev ua tiav ntawm kev hloov pauv PHY ua haujlwm siab los ntawm ITU-T G.hn tus qauv rau hauv EoC nkag network architecture. Qhov "golden ua ke" ntawm OFDM thiab LDPC siv nyob rau hauv nws PHY yog tus yuam sij rau kev ua tau zoo ntawm tus neeg teb xov tooj-qib kev ua tau zoo- siab bandwidth, muaj zog tiv thaiv kev cuam tshuam, thiab tsis tshua muaj latency- ua rau nws yog ib qho kev daws teeb meem zoo tshaj plaws rau kev hloov pauv ob txoj hauv kev tshaj tawm hauv xov tooj cua hauv xov tooj cua thiab kev siv hluav taws xob siab ceev.
