{"id":86250,"date":"2020-06-23T13:42:20","date_gmt":"2020-06-23T11:42:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/novyj-standart-802-11ah-high-efficiency-wlan-chto-zhe-v-nem-novogo-i-kogda-ego-zhdat"},"modified":"2020-06-23T13:42:20","modified_gmt":"2020-06-23T11:42:20","slug":"novyj-standart-802-11ah-high-efficiency-wlan-chto-zhe-v-nem-novogo-i-kogda-ego-zhdat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/novyj-standart-802-11ah-high-efficiency-wlan-chto-zhe-v-nem-novogo-i-kogda-ego-zhdat","title":{"rendered":"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>T\u00f6\u00f6tav r\u00fchm alustas standardi kallal t\u00f6\u00f6tamist juba 2014. aastal ning praegu on t\u00f6\u00f6s draft3.0. See erineb oluliselt eelmistest 802.11 standardite p\u00f5lvkondadest, kus kogu t\u00f6\u00f6 mahtus kahe mustandi sisse. Seda p\u00f5hjustab piisavalt suur arv plaanitud keerulisi muudatusi, mis omakorda n\u00f5uavad detailsemat ja keerulisemat \u00fchilduvustestimist. R\u00fchma esialgne eesm\u00e4rk oli spektri kasutamise efektiivsuse parandamine, et suurendada WLAN-i l\u00e4bilaskev\u00f5imet tiheda abonentide ja juurpuntide tiheda hulga korral. Peamised tegurid standardi arendamiseks olid: mobiilikasutajate arvu suurenemine, live-\u00fclekanded sotsiaalmeedias (fookus \u00fcleslaadimise liiklusele) ja muidugi IoT.<\/p>\n<h4>Uuenduste skeem n\u00e4eb v\u00e4lja j\u00e4rgmine:<\/h4>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/36a0bd4ee33a05f57900ba3ea9c409fc.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h4><b>MIMO 8\u00d78, rohkem ruumilisi vooge<\/b><\/h4>\n<p>\nToetust MIMO 8\u00d78, kuni 8SS (ruumilised vood). Standard 802.11ac kirjeldas samuti toetust 8 SS teoorias, kuid praktikas olid 802.11ac \u201ewave 2\u201d juurdep\u00e4\u00e4supunktid piiratud 4 ruumilise voolu toetamisega. Seega saavad MIMO 8\u00d78 toetava juurdep\u00e4\u00e4supunktid samaaegselt teenindada kuni 8 klienti 1x1, neli klienti 2x2 jne.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/04f9880565115724d4c36ee000323846.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>MU-MIMO DL\/UL (Multi-User MIMO allalaadimine\/\u00fcleslaadimine)<\/b><\/h4>\n<p>\nSamasugune tugi multiuser re\u017eiimile nii allalaadimise kui ka \u00fcleslaadimise kanalites. V\u00f5imalus samal ajal konkurentsiv\u00f5imeliseks juurdep\u00e4\u00e4suks \u00fcleslaadimise kanalile, andmete ja kontrollraamide r\u00fchmitamine v\u00e4hendab oluliselt \u201e\u00fclekoormust\u201c, mis suurendab l\u00e4bilaskev\u00f5imet ja v\u00e4hendab reageerimisaega.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/4bf73e1a736677d222292fb240093278.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>Pikendatud OFDM s\u00fcmbol<\/b><\/h4>\n<p>\nOFDM on t\u00f6\u00f6tanud standardites 802.11a\/g\/n\/ac umbes 20 aastat ilma muudatusteta. Vastavalt standardile on 20MHz laiuses kanalis 64 alamkandjat, mis asuvad \u00fcksteisest 312,5 kHz kaugusel (20MHz\/64). Kuna selle aja jooksul on pooljuhtide t\u00f6\u00f6stus edasi liikunud, pakutakse 802.11ah-s 4-kordset alamkandjate arvu suurenemist kuni 256, alamkandjate vahemaa on 78,125 kHz. OFDM s\u00fcmboli pikkus (aeg) on p\u00f6\u00f6rdv\u00f5rdeline sagedusega ning suureneb seega samuti 4 korda, alates 3,2 \u03bcs kuni 12,8 \u03bcs. See t\u00e4iustus suurendab andmete edastamise efektiivsust ja usaldusv\u00e4\u00e4rsust, eriti \u201e\u00f5ues\u201c WLAN-is.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/419a44a117fc1ec3668cb96606a397be.png\" style=\"display:block;margin: 0 auto;\" \/><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/387221308864da403503298929f1ca0a.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>Pikendatud ulatus<\/b><\/h4>\n<p>\nUued kaitsevahendite v\u00e4\u00e4rtused karkassi vahel on n\u00fc\u00fcd 1,6 \u03bcs ja 3,2 \u03bcs \"outdoor\" WLAN-i jaoks, \"indoor\" jaoks j\u00e4\u00e4b intervall 0,8 \u03bcs. Uus paketite formaat koos usaldusv\u00e4\u00e4rsema (pikema) preambuliga. K\u00f5ik eeltoodu v\u00f5imaldab saavutada kuni 4-kordse kiiruset\u00f5usu v\u00f5rgu piiril.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/52b4048a122395892e753fb1e2edb143.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>OFDMA DL\/UL (Ortogonaalne sageduse jaotamise mitme ligip\u00e4\u00e4su tehnoloogia)<\/b><\/h4>\n<p>\n\u00dcks peamisi muudatusi on OFDMA kasutuselev\u00f5tt OFDM asemel. OFDMA tehnoloogiat kasutatakse LTE-v\u00f5rkudes ja see on t\u00f5estanud oma k\u00f5rget efektiivsust. Erinevus seisneb selles, et OFDM-is kasutab kogu sageduskanal ja seni, kuni edastus ei ole l\u00f5petatud, ei saa j\u00e4rgmine klient sagedusressurssi kasutada. OFDMA puhul lahendatakse see probleem jagades kanali erineva laiusega subkanaliteks, mida nimetatakse RU-ks (ressursi\u00fchikud). Praktikas t\u00e4hendab see, et 256 alamsagedust 20 MHz kanalis saab jagada RU-ks 26 alamsagedusega. Iga RU jaoks saab m\u00e4\u00e4rata oma kodeerimisstrateegia MCS ja edastuse v\u00f5imsuse.<br \/>\nKokkuv\u00f5ttes toob see m\u00e4rkimisv\u00e4\u00e4rse v\u00f5rgumahtude suurenemise ning ka iga eraldi kliendi jaoks suurema l\u00e4bilaskev\u00f5ime.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/10ec320ccd52e9689906cd1050fae12f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/ef07d56ff3145c1df555e78418366368.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>1024 QAM<\/b><\/h4>\n<p>\nUued MCS (modulatsiooni ja kodeerimise komplekti) 10 ja 11 on lisatud 1024-QAM-i modulatsiooniks. See t\u00e4hendab, et n\u00fc\u00fcd kannab \u00fcks s\u00fcmbol selles skeemis 10 bitti teavet, mis on 25% suurenemine v\u00f5rreldes 8 bitiga 256-QAM-is.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/ccb86190a62b645de5c1d3b879ddff29.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>TWT (Target Wake Time) \u2013 \u201e\u00dclesse t\u00f5usu ressursi ajastamine\u201c<\/b><\/h4>\n<p>\nEnergiat s\u00e4\u00e4stev mehhanism, mis on t\u00f5estanud end standardis 802.11ah ja n\u00fc\u00fcd on see kohandatud 802.11ax-i. TWT v\u00f5imaldab juurdep\u00e4\u00e4supunktidel teavitada kliente, millal minna energias\u00e4\u00e4sture\u017eiimi, ning pakub ajakava, millal \u00e4rgata teabe vastuv\u00f5tmiseks v\u00f5i edastamiseks. Need on v\u00e4ga l\u00fchikesed ajaperioodid, kuid v\u00f5imalus magada hulga l\u00fchikeste perioodide jooksul on aku t\u00f6\u00f6p\u00f5him\u00f5ttes suur t\u00e4htsus. \u201eContention\u201c ja konfliktide v\u00e4hendamine klientide vahel suurendab aega energias\u00e4\u00e4sture\u017eiimis. S\u00f5ltuvalt liiklusest v\u00f5ivad energiatarbimise parendused ulatuda 65% kuni 95%-ni (Broadcomi testide kohaselt). IoT seadmete jaoks on TWT-toe olemasolu \u00e4\u00e4rmiselt oluline.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/0b06bbc6184eec0eb5f803b232ab44f1.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>BSS v\u00e4rv \u2013 ruumiline taaskasutus<\/b><\/h4>\n<p>\nSelleks, et suurendada tiheda WLAN-v\u00f5rgu mahtu, tuleb suurendada kanaliteressurssi taaskasutamise sagedust. Naabruses tegutsevate BSS-ide m\u00f5ju, mis t\u00f6\u00f6tavad samal kanalis, v\u00e4hendamiseks on soovitatav kasutada \"color-bit\" m\u00e4rgistust. See v\u00f5imaldab d\u00fcnaamiliselt reguleerida CCA (selge kanali hindamine) tundlikkust ja saatjatoimet. V\u00f5rgu maht suureneb kanaliplaani tihendamise t\u00f5ttu, samas kui olemasolev h\u00e4ire avaldab MCS-i valikule v\u00e4hem m\u00f5ju.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ah (k\u00f5rge efektiivsusega WLAN), mis selles uues on ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/3c6764f39a83577809d9bfb07205cfd4.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Seoses l\u00e4heneva turvastandardite uuendamisega kuni <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/globalsign\/blog\/415391\/\">WPA3<\/a><\/noindex>, ei pruugi k\u00f5igil olla v\u00f5imalik turvak\u00fcsimusi lahendada lihtsalt tarkvara uuendamisega, seet\u00f5ttu esitleb ettev\u00f5te Extreme Networks 2018. aasta neljandas kvartalis juurdep\u00e4\u00e4supunkte, millel on riistvara tugi 802.11ah ja WPA3. <\/p>\n<p>T\u00e4iendavalt 802.11ah kohta <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/348472\/\">802.11ah<\/a><\/noindex>.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/extremenetworks\/blog\/416327\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0431\u043e\u0447\u0430\u044f \u0433\u0440\u0443\u043f\u0430 \u043d\u0430\u0447\u0430\u043b\u0430 \u0440\u0430\u0431\u043e\u0442\u0443 \u043d\u0430\u0434 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u043c \u0435\u0449\u0435 \u0432 2014 \u0433\u043e\u0434\u0443 \u0438 \u0441\u0435\u0439\u0447\u0430\u0441 \u0438\u0434\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0430 \u043d\u0430\u0434 draft3.0. \u0427\u0442\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043e\u0442 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0438\u0445 \u043f\u043e\u043a\u043e\u043b\u0435\u043d\u0438\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u0432 802.11, \u0432\u0435\u0434\u044c \u0442\u0430\u043c \u0432\u0441\u044f \u0440\u0430\u0431\u043e\u0442\u0430 \u0443\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u043b\u0430\u0441\u044c \u0432 \u0434\u0432\u0430 \u0434\u0440\u0430\u0444\u0442\u0430. \u041f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u044d\u0442\u043e \u043f\u043e \u043f\u0440\u0438\u0447\u0438\u043d\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u0447\u0438\u0441\u043b\u0430 \u0437\u0430\u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043b\u0435\u043a\u0441\u043d\u044b\u0445 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u0442\u0440\u0435\u0431\u0443\u044e\u0442 \u0431\u043e\u043b\u0435\u0435 \u0434\u0435\u0442\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0438 \u0441\u043b\u043e\u0436\u043d\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0435\u0440\u0435\u0434 \u0433\u0440\u0443\u043f\u043f\u043e\u0439 \u0441\u0442\u043e\u044f\u043b\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":86251,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-86250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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