Video: Qhov ntau ntawm Nb IoT yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
2. Technical sib txawv: SIGFOX, LORA, thiab NB-IOT
| Sigfox | NB - IoT | |
|---|---|---|
| Ntau yam | 10 km (nroog), 40 km (nyob deb nroog) | 1 km (nroog), 10 km (nyob deb nroog) |
| Kev tiv thaiv kev cuam tshuam | Siab heev | Tsawg |
| Authentication & encryption | Tsis txhawb | Yog ( LTE encryption) |
| Adaptive cov ntaub ntawv tus nqi | Tsis muaj | Tsis muaj |
Ib yam li ntawd, NB IoT ua haujlwm li cas?
NB - IoT yog ib qho kev siv tshuab uas ua rau muaj ntau yam khoom siv xa cov ntaub ntawv uas tsis muaj cov txheej txheem mobile network. Nws siv cov ntawv tso cai zaus spectrum uas tsis muaj kev cuam tshuam nrog lwm yam khoom siv uas lav tau cov ntaub ntawv hloov pauv ntau dua.
Ib yam li ntawd, vim li cas NB hauv IoT? NarrowBand-Internet ntawm Yam ( NB - IoT ) yog cov qauv siv hluav taws xob qis dav dav (LPWA) thev naus laus zis tsim los ua kom muaj ntau yam tshiab IoT khoom siv thiab kev pabcuam. NB - IoT ho txhim kho lub zog noj ntawm cov neeg siv khoom, lub peev xwm thiab spectrum efficiency, tshwj xeeb tshaj yog nyob rau hauv sib sib zog nqus kev pab them nqi.
Ib sab saum toj no, NB IoT yog dab tsi hauv LTE?
Narrowband Internet ntawm Yam ( NB - IoT ) yog Low Power Wide Area Network (LPWAN) xov tooj cua tus qauv tsim los ntawm 3GPP kom pab tau ntau yam khoom siv ntawm tes thiab kev pabcuam. NB - IoT siv ib tug subset ntawm lub LTE tus qauv, tab sis txwv lub bandwidth rau ib leeg nqaim-band ntawm 200 kHz.
Vim li cas LoRa ntev npaum li cas?
LoRa pab ntev - ntau kis tau tus mob (ntau tshaj 10 km hauv cheeb tsam nyob deb nroog) nrog kev siv hluav taws xob tsawg. Cov thev naus laus zis npog cov txheej txheem lub cev, thaum lwm cov thev naus laus zis thiab cov txheej txheem xws li LoRaWAN ( Ntev Ntev Wide Area Network) npog cov khaubncaws sab nraud povtseg.
Pom zoo:
Dab tsi yog qhov kwv yees tus naj npawb ntawm cov khoom sib txuas ntawm IoT los ntawm 2020?
'Internet of Things' Txuas Cov Khoom Siv Ua Si yuav luag txog peb zaug rau ntau dua 38 billion units los ntawm 2020. Hampshire, 28th Lub Xya Hli: Cov ntaub ntawv tshiab los ntawm Juniper Research tau qhia tias tus naj npawb ntawm IoT (Internet of Things) txuas nrog cov khoom siv yuav muaj 38.5 billion hauv 2020, nce. Los ntawm 13.4 billion hauv 2015: nce ntau dua 285%
Dab tsi yog qhov txhais ntawm ntau qhov kev txawj ntse?
Txoj kev xav ntawm ntau qhov kev txawj ntse sib txawv ntawm tib neeg kev txawj ntse rau hauv cov 'modalities', es tsis pom kev txawj ntse los ntawm ib qho kev muaj peev xwm. Howard Gardner tau npaj cov qauv no hauv nws 1983 phau ntawv Frames of Mind: Theory of Multiple Intelligences
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index