{"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\/hu\/blog\/administrirovanie\/novyj-standart-802-11ah-high-efficiency-wlan-chto-zhe-v-nem-novogo-i-kogda-ego-zhdat","title":{"rendered":"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A munkacsoport 2014 \u00f3ta dolgozik a szabv\u00e1nyon, \u00e9s jelenleg a draft3.0 kidolgoz\u00e1sa zajlik. Ez n\u00e9mileg elt\u00e9r a kor\u00e1bbi 802.11-es gener\u00e1ci\u00f3kt\u00f3l, amelyek mind\u00f6ssze k\u00e9t tervezetet tartalmaztak. Ennek oka a tervezett komplex v\u00e1ltoztat\u00e1sok nagy sz\u00e1ma, amelyek r\u00e9szletesebb \u00e9s bonyolultabb kompatibilit\u00e1si tesztel\u00e9st ig\u00e9nyelnek. A csoport kezdeti c\u00e9lja a spektrum felhaszn\u00e1l\u00e1s\u00e1nak hat\u00e9konys\u00e1g\u00e1nak jav\u00edt\u00e1sa volt, hogy n\u00f6velje a WLAN kapacit\u00e1s\u00e1t magas \u00e1llom\u00e1nys\u0171r\u0171s\u00e9g mellett. A szabv\u00e1ny fejl\u0151d\u00e9s\u00e9nek f\u0151 hajt\u00f3erejei: a mobil el\u0151fizet\u0151k sz\u00e1m\u00e1nak n\u00f6veked\u00e9se, \u00e9l\u0151 k\u00f6zvet\u00edt\u00e9sek a k\u00f6z\u00f6ss\u00e9gi m\u00e9di\u00e1ban (f\u00f3kusz a felt\u00f6lt\u00e9si forgalomra) \u00e9s term\u00e9szetesen az IoT.<\/p>\n<h4>A grafikonon az \u00faj\u00edt\u00e1sok a k\u00f6vetkez\u0151k\u00e9ppen n\u00e9znek ki:<\/h4>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" 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, t\u00f6bb t\u00e9rbeli \u00e1raml\u00e1s<\/b><\/h4>\n<p>\nMegjelenik a MIMO 8\u00d78 t\u00e1mogat\u00e1s, ak\u00e1r 8SS (t\u00e9rbeli \u00e1raml\u00e1sok) eset\u00e9n. Az 802.11ac szabv\u00e1ny szint\u00e9n le\u00edrta a 8 SS t\u00e1mogat\u00e1s\u00e1t elm\u00e9letben, de gyakorlatban az 802.11ac 'wave 2' hozz\u00e1f\u00e9r\u00e9si pontok 4 t\u00e9rbeli \u00e1raml\u00f3ra voltak korl\u00e1tozva. Ennek megfelel\u0151en a MIMO 8x8 t\u00e1mogat\u00e1ssal rendelkez\u0151 hozz\u00e1f\u00e9r\u00e9si pontok k\u00e9pesek egyszerre ak\u00e1r 8 1x1, n\u00e9gy 2x2 \u00fcgyf\u00e9l kiszolg\u00e1l\u00e1s\u00e1ra is.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" 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 Le- \u00e9s Felt\u00f6lt\u00e9s)<\/b><\/h4>\n<p>\nEgyidej\u0171 multiuser m\u00f3d t\u00e1mogat\u00e1sa mind a let\u00f6lt\u00e9si, mind a felt\u00f6lt\u00e9si csatorn\u00e1ban. Az upload csatorn\u00e1hoz val\u00f3 egyidej\u0171 versenyk\u00e9pes hozz\u00e1f\u00e9r\u00e9s lehet\u0151s\u00e9ge, valamint az adat- \u00e9s vez\u00e9rl\u0151keretek csoportos\u00edt\u00e1sa jelent\u0151sen cs\u00f6kkenti a \u201et\u00f6bbletkiad\u00e1sokat\u201d, ami a s\u00e1vsz\u00e9less\u00e9g n\u00f6veked\u00e9s\u00e9hez \u00e9s a v\u00e1laszid\u0151 cs\u00f6kken\u00e9s\u00e9hez vezet.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/4bf73e1a736677d222292fb240093278.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>Hossz\u00fa OFDM szimb\u00f3lum<\/b><\/h4>\n<p>\nAz OFDM az 802.11a\/g\/n\/ac szabv\u00e1nyokban k\u00f6r\u00fclbel\u00fcl 20 \u00e9ve v\u00e1ltozatlanul m\u0171k\u00f6dik. A szabv\u00e1ny szerint a 20MGz sz\u00e9less\u00e9g\u0171 csatorn\u00e1ban 64 alhordoz\u00f3 helyezkedik el, amelyek 312,5 kHz t\u00e1vols\u00e1gra helyezkednek el egym\u00e1st\u00f3l (20MHz\/64). Mivel ez id\u0151 alatt a f\u00e9lvezet\u0151ipar jelent\u0151s el\u0151rel\u00e9p\u00e9st tett, az 802.11ax 256 alhordoz\u00f3 n\u00e9gyszeres n\u00f6vel\u00e9s\u00e9t javasolja, 78,125 kHz t\u00e1vols\u00e1ggal az alhordoz\u00f3k k\u00f6z\u00f6tt. Az OFDM szimb\u00f3lum hossza (id\u0151) ford\u00edtott ar\u00e1nyban \u00e1ll a frekvenci\u00e1val, teh\u00e1t ez is n\u00e9gyszeres\u00e9re n\u0151 3,2 \u00b5s-r\u00f3l 12,8 \u00b5s-ra. Ez a fejleszt\u00e9s n\u00f6veli az adat\u00e1tvitel hat\u00e9konys\u00e1g\u00e1t \u00e9s megb\u00edzhat\u00f3s\u00e1g\u00e1t, k\u00fcl\u00f6n\u00f6sen a \u201ek\u00fcls\u0151\u201d WLAN eset\u00e9ben.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/419a44a117fc1ec3668cb96606a397be.png\" style=\"display:block;margin: 0 auto;\" \/><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/387221308864da403503298929f1ca0a.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>Kib\u0151v\u00edtett Hat\u00f3t\u00e1vols\u00e1g<\/b><\/h4>\n<p>\nAz \u00faj v\u00e9dekez\u00e9si intervallumok \u00e9rt\u00e9keket adtak hozz\u00e1 a keretek k\u00f6z\u00f6tt, amelyek most m\u00e1r 1,6 \u03bcs \u00e9s 3,2 \u03bcs lehetnek az \u201eoutdoor\u201d WLAN eset\u00e9ben, az \u201eindoor\u201d eset\u00e9n az intervallum 0,8 \u03bcs maradt. Az \u00faj csomagform\u00e1tum megb\u00edzhat\u00f3bb (hosszabb) el\u0151tartalommal rendelkezik. Mindez lehet\u0151v\u00e9 teszi ak\u00e1r n\u00e9gyszeres sebess\u00e9gn\u00f6vel\u00e9st az h\u00e1l\u00f3zat hat\u00e1r\u00e1n.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/52b4048a122395892e753fb1e2edb143.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>OFDMA DL\/UL (Orthogonal Frequency Division Multiple Access)<\/b><\/h4>\n<p>\nAz egyik legfontosabb v\u00e1ltoz\u00e1s az OFDM helyett az OFDMA bevezet\u00e9se. Az OFDMA technol\u00f3gi\u00e1t LTE h\u00e1l\u00f3zatokban haszn\u00e1lj\u00e1k \u00e9s bizony\u00edtottan magas hat\u00e9konys\u00e1g\u00fa. A k\u00fcl\u00f6nbs\u00e9g abban rejlik, hogy OFDM eset\u00e9n az eg\u00e9sz frekvenciacsatorna foglalt lesz a k\u00fcld\u00e9s ideje alatt, \u00e9s am\u00edg a k\u00fcld\u00e9s nem fejez\u0151dik be, a k\u00f6vetkez\u0151 kliens nem tudja ig\u00e9nybe venni a frekvenci\u00e1t. Az OFDMA eset\u00e9n ezt a probl\u00e9m\u00e1t \u00fagy oldj\u00e1k meg, hogy a csatorn\u00e1t k\u00fcl\u00f6nb\u00f6z\u0151 sz\u00e9less\u00e9g\u0171 alkatr\u00e9szekre, \u00fagynevezett RU (Resource Units) egys\u00e9gekre osztj\u00e1k. A gyakorlatban ez azt jelenti, hogy a 256 hordoz\u00f3 20MHz-es csatorn\u00e1ja RU egys\u00e9gekre bonthat\u00f3, mindegyiknek 26 hordoz\u00f3j\u00e1val. Minden RU-hoz saj\u00e1t k\u00f3dol\u00e1si s\u00e9m\u00e1t (MCS) \u00e9s \u00e1tviteli teljes\u00edtm\u00e9nyt rendelhet\u00fcnk.<br \/>\n\u00d6sszess\u00e9g\u00e9ben ez jelent\u0151s kapacit\u00e1sn\u00f6veked\u00e9st hoz a h\u00e1l\u00f3zatban, valamint nagyobb s\u00e1vsz\u00e9less\u00e9get minden egyes kliens sz\u00e1m\u00e1ra.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/10ec320ccd52e9689906cd1050fae12f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/ef07d56ff3145c1df555e78418366368.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>1024 QAM<\/b><\/h4>\n<p>\n\u00daj MCS (Modulation and Coding Sets) 10 \u00e9s 11 ker\u00fclt bevezet\u00e9sre az 1024-QAM modul\u00e1ci\u00f3hoz. Ez azt jelenti, hogy most egy szimb\u00f3lum ebben a s\u00e9m\u00e1ban 10 bit inform\u00e1ci\u00f3t hordoz, ami 25%-os n\u00f6veked\u00e9s a 256-QAM 8 bitj\u00e9hez k\u00e9pest.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/ccb86190a62b645de5c1d3b879ddff29.png\" style=\"display:block;margin: 0 auto;\" \/> <\/p>\n<h4><b>TWT (Target Wake Time) \u2013 \u201eUp Link resource scheduling\u201d<\/b><\/h4>\n<p>\nAz energia-megtakar\u00edt\u00e1si mechanizmus, amely sikeresen bebizony\u00edtotta mag\u00e1t a 802.11ah szabv\u00e1nyban \u00e9s most adapt\u00e1lt\u00e1k a 802.11ax-hoz. A TWT lehet\u0151v\u00e9 teszi az hozz\u00e1f\u00e9r\u00e9si pontok sz\u00e1m\u00e1ra, hogy t\u00e1j\u00e9koztass\u00e1k a klienseket, mikor l\u00e9pjenek energiatakar\u00e9kos \u00fczemm\u00f3dba, \u00e9s \u00fctemezik, mikor kell fel\u00e9bredni inform\u00e1ci\u00f3k fogad\u00e1sa vagy k\u00fcld\u00e9se \u00e9rdek\u00e9ben. Ezek nagyon r\u00f6vid id\u0151szakok, de az a lehet\u0151s\u00e9g, hogy sok r\u00f6vid id\u0151szakot aludjanak, nagy jelent\u0151s\u00e9ggel b\u00edr az akkumul\u00e1tor teljes\u00edtm\u00e9nye szempontj\u00e1b\u00f3l. A \u201eversenyhelyzet\u201d \u00e9s a kliensek k\u00f6z\u00f6tti \u00fctk\u00f6z\u00e9sek cs\u00f6kkent\u00e9se n\u00f6veli az energiatakar\u00e9kos \u00fczemm\u00f3dban elt\u00f6lt\u00f6tt id\u0151t. A forgalom t\u00edpus\u00e1t\u00f3l f\u00fcgg\u0151en az energiafogyaszt\u00e1s javul\u00e1sa 65% \u00e9s 95% k\u00f6z\u00f6tt v\u00e1ltozhat (a Broadcom tesztjei szerint). Az IoT eszk\u00f6z\u00f6k sz\u00e1m\u00e1ra a TWT t\u00e1mogat\u00e1sa kiv\u00e9telesen fontos.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/0b06bbc6184eec0eb5f803b232ab44f1.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4><b>BSS Color \u2013 T\u00e9rbeli \u00fajrahaszn\u00e1lat<\/b><\/h4>\n<p>\nA h\u00e1l\u00f3zati kapacit\u00e1s n\u00f6vel\u00e9s\u00e9hez a s\u0171r\u0171 WLAN-okban n\u00f6velni kell a csatornaer\u0151forr\u00e1sok \u00fajrafelhaszn\u00e1l\u00e1si gyakoris\u00e1g\u00e1t. A szomsz\u00e9dos BSS-ek, amelyek ugyanazon a csatorn\u00e1n m\u0171k\u00f6dnek, hat\u00e1s\u00e1nak cs\u00f6kkent\u00e9se \u00e9rdek\u00e9ben javasolt \u0151ket \u201ecolor-bit\u201d jel\u00f6l\u00e9ssel ell\u00e1tni. Ez lehet\u0151v\u00e9 teszi a CCA (clear channel assessment) \u00e9rz\u00e9kenys\u00e9g \u00e9s a jelad\u00f3 teljes\u00edtm\u00e9ny dinamikus be\u00e1ll\u00edt\u00e1s\u00e1t. A h\u00e1l\u00f3zati kapacit\u00e1s n\u00f6vekszik a csatornaplan s\u0171r\u00edt\u00e9s\u00e9vel, mik\u00f6zben a megl\u00e9v\u0151 interferencia kisebb hat\u00e1ssal lesz az MCS kiv\u00e1laszt\u00e1s\u00e1ra.<\/p>\n<p><img decoding=\"async\" alt=\"Az \u00faj 802.11ax (High Efficiency WLAN) szabv\u00e1ny, mit is hoz mag\u00e1val \u00e9s mikor v\u00e1rhat\u00f3?\" src=\"\/wp-content\/uploads\/2020\/06\/3c6764f39a83577809d9bfb07205cfd4.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>A k\u00f6zelg\u0151 biztons\u00e1gi szabv\u00e1nyok friss\u00edt\u00e9se miatt <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/globalsign\/blog\/415391\/\">WPA3<\/a><\/noindex>, nem mindenki fog tudni egyszer\u0171 szoftverfriss\u00edt\u00e9ssel megoldani a biztons\u00e1gi probl\u00e9m\u00e1kat, ez\u00e9rt az Extreme Networks m\u00e1r 2018 negyedik negyed\u00e9v\u00e9ben bemutatja az 802.11ah \u00e9s WPA3 hardveres t\u00e1mogat\u00e1ssal rendelkez\u0151 hozz\u00e1f\u00e9r\u00e9si pontokat. <\/p>\n<p>Tov\u00e1bbi inform\u00e1ci\u00f3k az <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/348472\/\">802.11ah<\/a><\/noindex>.<br \/>\n<br \/>Forr\u00e1s: <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 5.0.3 - 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