{"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 802.11ax (High Efficiency WLAN), mis on selle uus ja millal seda oodata?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>T\u00f6\u00f6grupp alustas standardi loomist juba 2014. aastal ja praegu on t\u00f6\u00f6s draft3.0. See erineb varasematest 802.11 standardite p\u00f5lvkondadest, kuna seal mahtus kogu t\u00f6\u00f6 kahe mustandi sisse. Selle p\u00f5hjuseks on piisavalt suur hulk plaanitud keerulisi muudatusi, mis n\u00f5uavad vastavalt p\u00f5hjalikumat ja keerulisemat \u00fchilduvuse testimist. Alguses seisis grupi ees \u00fclesanne spektri kasutuse efektiivsuse parandamine WLAN-i l\u00e4bilaskev\u00f5ime suurendamiseks suurte abonentide ja juurdep\u00e4\u00e4supunktide tihedusega. Peamised arenduste tegurid olid: mobiilsete abonentide arvu suurenemine, otse\u00fclekanded sotsiaalmeedias (fookus \u00fcleslaadimistaktil) ja muidugi IoT.<\/p>\n<h4>Uuenduste skeemiline kujutamine n\u00e4eb v\u00e4lja j\u00e4rgmine:<\/h4>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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>\nToetatakse MIMO 8&#215;8, kuni 8SS (ruumilised voolud). Standard 802.11ac kirjeldas samuti 8 SS-i toetust teoreetiliselt, kuid praktikas piirdusid 802.11ac \"wave 2\" ligip\u00e4\u00e4supunktid 4 ruumilise voo toega. Seet\u00f5ttu saavad MIMO 8x8 toega ligip\u00e4\u00e4supunktid samaaegselt teenindada kuni 8 klienti 1x1, nelja klienti 2x2 jne.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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 (Mitme kasutaja MIMO allalaadimine\/\u00fcleslaadimine)<\/b><\/h4>\n<p>\nSamaaegne multiuser-re\u017eiimi tugi nii allalaadimise kui ka \u00fcleslaadimise kanalile. V\u00f5ime samaaegselt konkureerida \u00fcleslaadimise kanaliga, grupiviisiliselt andmete ja kontrollraamidega v\u00e4hendab m\u00e4rgatavalt 'overhead' mahtu, mis toob kaasa suurema l\u00e4bilaskev\u00f5ime ja l\u00fchema vastuseaja.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/4bf73e1a736677d222292fb240093278.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>Pikk OFDM s\u00fcmbol<\/b><\/h4>\n<p>\nOFDM t\u00f6\u00f6tab standardites 802.11a\/g\/n\/ac juba ~20 aastat muutumatuna. Vastavalt standardsusele paigutatakse 20 MHz laiusel kanalil 64 alamkandjat, mis asuvad \u00fcksteisest 312,5 kHz kaugusel (20 MHz\/64). Aja jooksul on pooljuhtide t\u00f6\u00f6stus teinud suuri edusamme ning 802.11ax pakub neljakordset suurendust alamkandjatele kuni 256, alamkandjate vahe on 78,125 kHz. OFDM s\u00fcmboli pikkus (aeg) on p\u00f6\u00f6rdv\u00f5rdeline sagedusega, seega suureneb see samuti neljakordselt, 3,2 \u03bcs-lt 12,8 \u03bcs-ni. See t\u00e4iustus parandab andmete edastamise efektiivsust ja usaldusv\u00e4\u00e4rsust, eriti \u201ev\u00e4lis\u201c WLAN-is.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/419a44a117fc1ec3668cb96606a397be.png\" style=\"display:block;margin: 0 auto;\" \/><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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 kaitseintervallide v\u00e4\u00e4rtused on lisatud raamide vahel, mis v\u00f5ivad n\u00fc\u00fcd olla 1,6 \u03bcs ja 3,2 \u03bcs \u201ev\u00e4lis\u201c WLAN-i jaoks, \u201esiseruumides\u201c on intervall endiselt 0,8 \u03bcs. Uus pakettformaat, millel on usaldusv\u00e4\u00e4rsem (pikem) eelpealkiri. K\u00f5ik \u00fclaltoodu v\u00f5imaldab saavutada kuni neljakordset kiiruskasvu v\u00f5rgu piiril.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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 (Ortoonaalne sagedusjaotuse mitme juurdep\u00e4\u00e4s)<\/b><\/h4>\n<p>\n\u00dcks peamisi muudatusi on OFDMA kasutuselev\u00f5tt OFDM asemel. OFDMA tehnoloogia, mida kasutatakse LTE-v\u00f5rkudes, on t\u00f5estanud oma k\u00f5rget efektiivsust. Erinevus seisneb selles, et OFDM-is h\u00f5ivab kogu sageduskanali ja kuni edastamine ei ole l\u00f5petatud, ei saa j\u00e4rgmine klient sagedusressurssi kasutada. OFDMA puhul lahendatakse see probleem kanali jagamisega erinevate laiusastega alakanaliteks, mida nimetatakse RU-deks (Resource Units). Praktikas t\u00e4hendab see, et 20 MHz kanali 256 alalainurit saab jagada RU-deks 26 alalainuriga. Igal RU-l on v\u00f5imalik m\u00e4\u00e4rata oma kodeerimisskeem MCS ja edastusv\u00f5imsus.<br \/>\nKokkuv\u00f5ttes toob see kaasa m\u00e4rkimisv\u00e4\u00e4rse v\u00f5rgu mahutavuse suurenemise ning ka ribalaiuse iga \u00fcksiku kliendi jaoks.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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 802.11ax (High Efficiency WLAN), mis on selle uus 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 (Modulation and Coding Sets) 10 ja 11 on lisatud 1024-QAM modulaatorile. See t\u00e4hendab, et n\u00fc\u00fcd kannab \u00fcks s\u00fcmbol selle skeemi j\u00e4rgi 10 bitti teavet, mis on 25% kasv v\u00f5rreldes 256-QAM-i 8 bitiga.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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 \"Up Link resource scheduling\"<\/b><\/h4>\n<p>\nEnergiat\u00f5hususe mehhanism, mis on ennast t\u00f5estanud standardis 802.11ah ja n\u00fc\u00fcd on see kohandatud 802.11ax-iga. TWT v\u00f5imaldab ligip\u00e4\u00e4supunktidel teatada klientidele, millal energias\u00e4\u00e4sture\u017eiimi minna, ja esitada ajakava, millal \u00e4rkama, et andmeid vastu v\u00f5tta v\u00f5i edastada. Need on v\u00e4ga l\u00fchikesed ajavahemikud, kuid v\u00f5imalus magada palju l\u00fchikesi perioode on olulise t\u00e4htsusega aku t\u00f6\u00f6ea pikendamiseks. Klientide vaheline \u201ekonkurents\u201c ja kokkup\u00f5rked v\u00e4henevad, mis suurendab energias\u00e4\u00e4sture\u017eiimis viibimise aega. S\u00f5ltuvalt liiklusest v\u00f5ivad energiatarbimise parandused ulatuda 65% kuni 95%-ni (Broadcomi testide kohaselt). IoT seadmete jaoks on TWT toetus \u00e4\u00e4rmiselt oluline.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus 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>\nSuurendada tihedate WLAN-v\u00f5rkude mahtu, on vajalik suurendada kanalite ressursi taaskasutuse sagedust. Et v\u00e4hendada naaberkandjates BSS, mis t\u00f6\u00f6tavad samal kanalil, m\u00f5ju, on soovitatav neid t\u00e4histada \u201ecolor-bit\u201c abil. See v\u00f5imaldab d\u00fcnaamiliselt kohandada CCA (selge kanali hindamise) tundlikkust ja edastamise v\u00f5imsust. V\u00f5rgu maht suureneb kanali plaani tihendamise kaudu, samas kui olemasolev interferents m\u00f5jutab MCS-i valikut v\u00e4hem.<\/p>\n<p><img decoding=\"async\" alt=\"Uus standard 802.11ax (High Efficiency WLAN), mis on selle uus ja millal seda oodata?\" src=\"\/wp-content\/uploads\/2020\/06\/3c6764f39a83577809d9bfb07205cfd4.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Seoses varasema turvastandardite uuendamisega <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/globalsign\/blog\/415391\/\">WPA3<\/a><\/noindex>, ei ole k\u00f5igil lihtne lahendada turvak\u00fcsimusi koos tarkvarauuendustega, seet\u00f5ttu esitleb ettev\u00f5te Extreme Networks juba 2018. aasta neljandas kvartalis juurdep\u00e4\u00e4supunkte, mis toetavad riistvaraliselt 802.11ax ja WPA3. <\/p>\n<p>Lisainfot <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/348472\/\">802.11ax<\/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 5.0.0.1 - 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