{"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\/cs\/blog\/administrirovanie\/novyj-standart-802-11ah-high-efficiency-wlan-chto-zhe-v-nem-novogo-i-kogda-ego-zhdat","title":{"rendered":"Nov\u00fd standard 802.11ah (High Efficiency WLAN), co nov\u00e9ho p\u0159in\u00e1\u0161\u00ed a kdy jej o\u010dek\u00e1vat?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pracovn\u00ed skupina zah\u00e1jila pr\u00e1ci na standardu ji\u017e v roce 2014 a nyn\u00ed prob\u00edh\u00e1 pr\u00e1ce na draftu 3.0. Co se od p\u0159edchoz\u00edch generac\u00ed standard\u016f 802.11 li\u0161\u00ed, proto\u017ee tam byla cel\u00e1 pr\u00e1ce rozd\u011blena do dvou draft\u016f. D\u016fvodem je dostate\u010dn\u011b velk\u00fd po\u010det pl\u00e1novan\u00fdch komplexn\u00edch zm\u011bn, kter\u00e9 vy\u017eaduj\u00ed podrobn\u011bj\u0161\u00ed a slo\u017eit\u011bj\u0161\u00ed testov\u00e1n\u00ed kompatibility. P\u016fvodn\u011b p\u0159ed skupinou st\u00e1lo zad\u00e1n\u00ed zlep\u0161it efektivitu vyu\u017e\u00edv\u00e1n\u00ed spektra za \u00fa\u010delem zv\u00fd\u0161en\u00ed propustnosti WLAN s vysokou hustotou u\u017eivatelsk\u00fdch stanic a p\u0159\u00edstupov\u00fdch bod\u016f. Hlavn\u00edmi hnac\u00edmi silami pro v\u00fdvoj standardu byly: zvy\u0161ov\u00e1n\u00ed po\u010dtu mobiln\u00edch u\u017eivatel\u016f, \u017eiv\u00e9 p\u0159enosy na soci\u00e1ln\u00edch s\u00edt\u00edch (d\u016fraz na uploadov\u00fd provoz) a samoz\u0159ejm\u011b IoT.<\/p>\n

Sch\u00e9maticky novinky vypadaj\u00ed n\u00e1sledovn\u011b:<\/h4>\n

\"Nov\u00fd<\/p>\n

<\/a><\/noindex><\/p>\n

MIMO 8\u00d78, v\u00edce prostorov\u00fdch tok\u016f<\/b><\/h4>\n

\nBude p\u0159id\u00e1na podpora MIMO 8\u00d78, a\u017e 8SS (prostorov\u00fdch tok\u016f). Standard 802.11ac tak\u00e9 popisoval podporu 8 SS teoreticky, ale v praxi byly p\u0159\u00edstupov\u00e9 body 802.11ac \"wave 2\" omezeny na podporu 4 prostorov\u00fdch tok\u016f. Tedy p\u0159\u00edstupov\u00e9 body s podporou MIMO 8x8 budou moci sou\u010dasn\u011b obsluhovat a\u017e 8 klient\u016f 1x1, \u010dty\u0159i klienty 2x2 atd.<\/p>\n

\"Nov\u00fd<\/p>\n

MU-MIMO DL\/UL (Multi-User MIMO Downlink\/Uplink)<\/b><\/h4>\n

\nSou\u010dasn\u00e1 podpora re\u017eimu multiuser jak pro download, tak pro upload kan\u00e1l. Mo\u017enost sou\u010dasn\u00e9ho konkuren\u010dn\u00edho p\u0159\u00edstupu k upload kan\u00e1lu, skupinov\u00e1n\u00ed jak datov\u00fdch, tak kontroln\u00edch r\u00e1mc\u016f, umo\u017en\u00ed v\u00fdrazn\u011b sn\u00ed\u017eit \u201eoverhead\u201c, co\u017e povede ke zv\u00fd\u0161en\u00ed propustnosti a sn\u00ed\u017een\u00ed doby odezvy.<\/p>\n

\"Nov\u00fd<\/p>\n

Dlouh\u00fd OFDM symbol<\/b><\/h4>\n

\nOFDM funguje ve standardech 802.11a\/g\/n\/ac po dobu ~20 let bez jak\u00fdchkoli zm\u011bn. Podle standardu je v kan\u00e1lu o \u0161\u00ed\u0159ce 20 MHz um\u00edst\u011bno 64 podnosn\u00fdch, kter\u00e9 jsou od sebe vzd\u00e1leny 312,5 kHz (20 MHz\/64). Vzhledem k tomu, \u017ee b\u011bhem t\u00e9to doby pr\u016fmysl polovodi\u010d\u016f ud\u011blal zna\u010dn\u00fd pokrok, v 802.11ah je navr\u017eeno \u010dty\u0159n\u00e1sobn\u00e9 zv\u00fd\u0161en\u00ed podnosn\u00fdch na 256, s intervalem mezi podnosn\u00fdmi 78,125 kHz. D\u00e9lka OFDM symbolu (\u010das) je obvykle inverzn\u00ed k frekvenci a tak\u00e9 se \u010dty\u0159ikr\u00e1t zv\u00fd\u0161\u00ed z 3,2 \u00b5s na 12,8 \u00b5s. Toto zlep\u0161en\u00ed zv\u00fd\u0161\u00ed efektivitu a spolehlivost p\u0159enosu dat, zvl\u00e1\u0161t\u011b v \u201eoutdoor\u201c WLAN.<\/p>\n

\"Nov\u00fd\"Nov\u00fd <\/p>\n

Roz\u0161\u00ed\u0159en\u00fd dosah<\/b><\/h4>\n

\nByly p\u0159id\u00e1ny nov\u00e9 hodnoty ochrann\u00fdch interval\u016f mezi r\u00e1mci, kter\u00e9 nyn\u00ed mohou b\u00fdt 1,6 \u03bcs a 3,2 \u03bcs pro \u201eoutdoor\u201c WLAN, zat\u00edmco pro \u201eindoor\u201c z\u016fst\u00e1v\u00e1 interval 0,8 \u03bcs. Nov\u00fd form\u00e1t paket\u016f s spolehliv\u011bj\u0161\u00ed (del\u0161\u00ed) preambul\u00ed. To v\u0161e umo\u017en\u00ed a\u017e \u010dty\u0159n\u00e1sobn\u00e9 zv\u00fd\u0161en\u00ed rychlosti p\u0159ipojen\u00ed na hranici s\u00edt\u011b.<\/p>\n

\"Nov\u00fd <\/p>\n

OFDMA DL\/UL (Orthogonal Frequency Division Multiple Access)<\/b><\/h4>\n

\nJednou z hlavn\u00edch zm\u011bn je zaveden\u00ed OFDMA nam\u00edsto OFDM. Technologie OFDMA se pou\u017e\u00edv\u00e1 v s\u00edt\u00edch LTE a prok\u00e1zala svou vysokou \u00fa\u010dinnost. Rozd\u00edl spo\u010d\u00edv\u00e1 v tom, \u017ee p\u0159i p\u0159enosu v OFDM zab\u00edr\u00e1 cel\u00fd frekven\u010dn\u00ed kan\u00e1l a dokud nen\u00ed p\u0159enos dokon\u010den, dal\u0161\u00ed klient nem\u016f\u017ee vyu\u017e\u00edt frekven\u010dn\u00ed zdroj. V OFDMA se \u00fakol \u0159e\u0161\u00ed tak, \u017ee se kan\u00e1l rozd\u011bluje na podkan\u00e1ly r\u016fzn\u00fdch \u0161\u00ed\u0159ek, naz\u00fdvan\u00e9 RU (Resource Units). V praxi to znamen\u00e1, \u017ee 256 podnosn\u00fdch 20MHz kan\u00e1lu m\u016f\u017ee b\u00fdt rozd\u011bleno na RU po 26 podnosn\u00fdch. Pro ka\u017ed\u00fd RU lze p\u0159i\u0159adit vlastn\u00ed sch\u00e9ma k\u00f3dov\u00e1n\u00ed MCS a tak\u00e9 v\u00fdkon p\u0159enosu.
\nV celkov\u00e9m pohledu to p\u0159inese v\u00fdznamn\u00e9 zv\u00fd\u0161en\u00ed kapacity s\u00edt\u011b obecn\u011b, a tak\u00e9 propustnosti pro ka\u017ed\u00e9ho jednotliv\u00e9ho klienta.<\/p>\n

\"Nov\u00fd
\n\"Nov\u00fd<\/p>\n

1024 QAM<\/b><\/h4>\n

\nByly p\u0159id\u00e1ny nov\u00e9 MCS (Modulation and Coding Sets) 10 a 11 pro modulaci 1024-QAM. To znamen\u00e1, \u017ee jeden symbol v t\u00e9to sch\u00e9matu p\u0159en\u00e1\u0161\u00ed 10 bit\u016f informac\u00ed, co\u017e p\u0159edstavuje 25% n\u00e1r\u016fst ve srovn\u00e1n\u00ed se 8 bity v 256-QAM.<\/p>\n

\"Nov\u00fd <\/p>\n

TWT (Target Wake Time) \u2013 \u201eUp Link resource scheduling\u201c<\/b><\/h4>\n

\nMechanismus \u00faspory energie, kter\u00fd se osv\u011bd\u010dil ve standardu 802.11ah a nyn\u00ed byl adaptov\u00e1n v 802.11ax. TWT umo\u017e\u0148uje p\u0159\u00edstupov\u00fdm bod\u016fm informovat klienty, kdy p\u0159ej\u00edt do re\u017eimu \u00faspory energie, a poskytuje harmonogram, kdy je t\u0159eba se probudit pro p\u0159\u00edjem nebo p\u0159enos informac\u00ed. To jsou velmi kr\u00e1tk\u00e9 \u010dasov\u00e9 \u00faseky, ale mo\u017enost sp\u00e1t b\u011bhem mnoha kr\u00e1tk\u00fdch period m\u00e1 velk\u00fd v\u00fdznam pro \u017eivotnost baterie. Sn\u00ed\u017een\u00ed \u201e\u00fatok\u016f\u201c a koliz\u00ed mezi klienty zv\u00fd\u0161\u00ed \u010das str\u00e1ven\u00fd v re\u017eimu \u00faspory energie. V z\u00e1vislosti na typu provozu se zlep\u0161en\u00ed spot\u0159eby energie m\u016f\u017ee pohybovat od 65% do 95% (podle test\u016f Broadcom). Pro za\u0159\u00edzen\u00ed IoT je podpora TWT nesm\u00edrn\u011b d\u016fle\u017eit\u00e1.<\/p>\n

\"Nov\u00fd<\/p>\n

BSS Color \u2013 Prostorov\u00e9 vyu\u017eit\u00ed<\/b><\/h4>\n

\nPro zv\u00fd\u0161en\u00ed kapacity s\u00edt\u00ed s vysokou hustotou WLAN je t\u0159eba zv\u00fd\u0161it frekvenci op\u011btovn\u00e9ho vyu\u017eit\u00ed kan\u00e1lov\u00fdch zdroj\u016f. Aby se sn\u00ed\u017eil vliv sousedn\u00edch BSS pracuj\u00edc\u00edch na stejn\u00e9m kan\u00e1lu, navrhuje se je ozna\u010dit pomoc\u00ed \u201ecolor-bit\u201c. To umo\u017en\u00ed dynamick\u00e9 p\u0159izp\u016fsoben\u00ed citlivosti CCA (clear channel assessment) a v\u00fdkonu vys\u00edla\u010de. Kapacita s\u00edt\u011b se zv\u00fd\u0161\u00ed d\u00edky zahu\u0161t\u011bn\u00ed kan\u00e1lov\u00e9ho pl\u00e1nu, p\u0159i\u010dem\u017e st\u00e1vaj\u00edc\u00ed interference bude m\u00edt men\u0161\u00ed vliv na v\u00fdb\u011br MCS.<\/p>\n

\"Nov\u00fd<\/p>\n

V souvislosti s bl\u00ed\u017e\u00edc\u00edmi se aktualizacemi bezpe\u010dnostn\u00edch standard\u016f na WPA3<\/a><\/noindex>, ne v\u0161ichni budou m\u00edt mo\u017enost vy\u0159e\u0161it bezpe\u010dnostn\u00ed probl\u00e9my jednoduchou aktualizac\u00ed softwaru, proto spole\u010dnost Extreme Networks ji\u017e ve \u010dtvrt\u00e9m \u010dtvrtlet\u00ed 2018 p\u0159edstav\u00ed p\u0159\u00edstupov\u00e9 body s hardwarovou podporou 802.11ah a WPA3. <\/p>\n

Dal\u0161\u00ed informace o 802.11ah<\/a><\/noindex>.
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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