{"id":389,"date":"2021-05-18T14:18:53","date_gmt":"2021-05-18T07:18:53","guid":{"rendered":"https:\/\/ttsi.com.vn\/?p=389"},"modified":"2021-05-24T14:36:05","modified_gmt":"2021-05-24T07:36:05","slug":"diem-khac-biet-wifi6","status":"publish","type":"post","link":"https:\/\/ttsi.com.vn\/?p=389","title":{"rendered":"\u0110i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ee7a Wifi-6"},"content":{"rendered":"<p><strong>S\u01a1 l\u01b0\u1ee3c v\u1ec1 c\u00e1c chu\u1ea9n WiFi hi\u1ec7n nay<\/strong><\/p>\n<p>C\u00f4ng ngh\u1ec7 Internet kh\u00f4ng d\u00e2y \u0111\u00e3 kh\u00f4ng ng\u1eebng ph\u00e1t tri\u1ec3n k\u1ec3 t\u1eeb khi ra \u0111\u1eddi. Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 WiFi-6, c\u00e1c b\u1ea1n n\u00ean d\u00e0nh v\u00e0i ph\u00fat \u0111\u1ec3 \u0111\u1ecdc nhanh s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a WiFi. T\u1eeb \u0111\u00f3, ch\u00fang ta s\u1ebd th\u1ea5y \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t v\u00e0 c\u00e1c l\u1ee3i \u00edch m\u00e0 WiFi-6 mang l\u1ea1i so v\u1edbi c\u00e1c chu\u1ea9n WiFi \u0111\u01b0\u01a1ng nhi\u1ec7m.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-653 aligncenter\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/Wifi-standard-history.png\" alt=\"-\" width=\"641\" height=\"378\" srcset=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/Wifi-standard-history.png 641w, https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/Wifi-standard-history-300x177.png 300w\" sizes=\"(max-width: 641px) 100vw, 641px\" \/><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>WiFi 2 (802.11b) ra m\u1eaft v\u00e0o th\u00e1ng 7 n\u0103m 1999, h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 l\u00ean \u0111\u1ebfn 11Mbps. Chu\u1ea9n n\u00e0y ho\u1ea1t \u0111\u1ed9ng t\u1ea1i b\u0103ng t\u1ea7n 2,4 Ghz n\u00ean r\u1ea5t d\u1ec5 b\u1ecb nhi\u1ec5u t\u1eeb c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed kh\u00e1c.<\/li>\n<li>WiFi 3 (802.11a\/g) ra m\u1eaft v\u00e0o n\u0103m 2003, WiFi 3 ph\u00e1t \u1edf t\u1ea7n s\u1ed1 cao h\u01a1n l\u00e0 5 Ghz nh\u1eb1m tr\u00e1nh b\u1ecb nhi\u1ec5u t\u1eeb c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c. T\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd c\u1ee7a chu\u1ea9n \u0111\u1ea1t 54 Mbps, tuy nhi\u00ean chu\u1ea9n n\u00e0y kh\u00f3 xuy\u00ean qua c\u00e1c v\u00e1ch t\u01b0\u1eddng v\u00e0 gi\u00e1 c\u1ea3 c\u1ee7a n\u00f3 h\u01a1i cao n\u00ean \u00edt ph\u1ed5 bi\u1ebfn.<\/li>\n<li>WiFi 4 (802.11n) ra m\u1eaft v\u00e0o n\u0103m 2009 v\u00e0 l\u00e0 chu\u1ea9n ph\u1ed5 bi\u1ebfn nh\u1ea5t hi\u1ec7n nay nh\u1edd s\u1ef1 v\u01b0\u1ee3t tr\u1ed9i h\u01a1n so v\u1edbi chu\u1ea9n b v\u00e0 g. Chu\u1ea9n k\u1ebft n\u1ed1i 802.11n h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 t\u1ed1i \u0111a l\u00ean \u0111\u1ebfn 300Mbps, c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u1ea3 b\u0103ng t\u1ea7n 2.4Ghz v\u00e0 5Ghz. Chu\u1ea9n n\u00e0y \u0111\u00e3 v\u00e0 \u0111ang d\u1ea7n thay th\u1ebf WiFi 3 v\u1edbi ph\u1ea1m vi ph\u00e1t s\u00f3ng l\u1edbn h\u01a1n, t\u1ed1c \u0111\u1ed9 cao h\u01a1n v\u00e0 gi\u00e1 h\u1ee3p l\u00fd h\u01a1n.<\/li>\n<li>WiFi 5 (802.11ac) ra m\u1eaft v\u00e0o n\u0103m 2013, thay th\u1ebf WiFi 4 ch\u1eadm ch\u1ea1p, t\u1ed1c \u0111\u1ed9 cao nh\u1ea5t l\u00ean \u0111\u1ebfn 1730 Mbps, ho\u1ea1t \u0111\u1ed9ng \u1edf c\u1ea3 b\u0103ng t\u1ea7n 2.4 Ghz v\u00e0 5 Ghz, n\u00f3 \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng ti\u00eau chu\u1ea9n kh\u00f4ng d\u00e2y cao c\u1ea5p nh\u1ea5t tr\u00ean th\u1ecb tr\u01b0\u1eddng hi\u1ec7n nay. N\u00f3 \u0111i k\u00e8m v\u1edbi r\u1ea5t nhi\u1ec1u s\u1eeda \u0111\u1ed5i v\u00e0 thay \u0111\u1ed5i \u0111\u1ec3 b\u1eaft k\u1ecbp v\u1edbi nhu c\u1ea7u ng\u00e0y c\u00e0ng cao v\u1ec1 t\u00ednh linh ho\u1ea1t v\u00e0 t\u00ednh di \u0111\u1ed9ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u0110\u01b0\u1ee3c ra m\u1eaft v\u00e0o n\u0103m 2019, WiFi-6 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng th\u00e1ch th\u1ee9c ch\u00ednh m\u00e0 m\u1ea1ng kh\u00f4ng d\u00e2y \u0111ang ph\u1ea3i \u0111\u1ed1i m\u1eb7t ng\u00e0y nay, \u0111\u00f3 l\u00e0:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-654\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/wifi6.png\" alt=\"-\" width=\"641\" height=\"352\"><\/p>\n<p>N\u00e2ng cao tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng trong m\u00f4i tr\u01b0\u1eddng m\u1eadt \u0111\u1ed9 cao, H\u1ed7 tr\u1ee3 c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 th\u1ea5p v\u00e0 b\u0103ng th\u00f4ng cao, nh\u01b0 ph\u00e1t tr\u1ef1c tuy\u1ebfn \u00e2m thanh v\u00e0 video theo th\u1eddi gian th\u1ef1c, H\u1ed7 tr\u1ee3 s\u1ef1 b\u00f9ng n\u1ed5 IoT, V\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd pin c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i. Wi-Fi 6 c\u0169ng \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i t\u1eeb c\u1ea3 hai b\u0103ng t\u1ea7n 2,4 v\u00e0 5 GHz. Ti\u00eau chu\u1ea9n Wi-Fi 6 ch\u1ec9 \u0111\u1ecbnh h\u01a1n 50 t\u00ednh n\u0103ng \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt v\u00e0 t\u1ea5t c\u1ea3 ch\u00fang \u0111\u1ec1u nh\u1eb1m m\u1ee5c \u0111\u00edch c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 c\u1ee7a k\u1ebft n\u1ed1i kh\u00f4ng d\u00e2y. B\u00e2y gi\u1edd ch\u00fang ta s\u1ebd th\u1ea5y m\u1ed9t s\u1ed1 ti\u1ebfn b\u1ed9 c\u00f4ng ngh\u1ec7 n\u00e0y.<\/p>\n<p><strong>C\u00e1c l\u1ee3i \u00edch WiFi-6 mang l\u1ea1i so v\u1edbi WIfi-5<\/strong><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-660 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/wifi6-benefits-e1621827188284.png\" alt=\"-\" width=\"641\" height=\"378\"><\/p>\n<p><strong>T\u1ed1c \u0111\u1ed9<\/strong><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-661 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/wifi6-speed-e1621827338669.png\" alt=\"-\" width=\"641\" height=\"378\"><\/p>\n<p><strong>\u0110a truy c\u1eadp ph\u00e2n chia theo t\u1ea7n s\u1ed1 OFDMA<\/strong><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-657 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/ofdma-e1621827384967.png\" alt=\"-\" width=\"641\" height=\"381\"><\/p>\n<p>OFDMA (Orthoganol Frequency Division Multiple Access) l\u1ea5y Access Point l\u00e0m trung t\u00e2m, cho ph\u00e9p \u0111i\u1ec3m truy c\u1eadp 802.11 ax giao ti\u1ebfp \u0111\u1ed3ng th\u1eddi v\u1edbi nhi\u1ec1u thi\u1ebft b\u1ecb b\u1eb1ng c\u00e1ch chia m\u1ed7i k\u00eanh WiFi th\u00e0nh c\u00e1c k\u00eanh nh\u1ecf h\u01a1n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn nh\u01b0 \u201c\u0111\u01a1n v\u1ecb t\u00e0i nguy\u00ean\u201d (RU- Resource Unit).<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-658 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/ofdma2-e1621827411590.png\" alt=\"-\" width=\"641\" height=\"378\"><\/p>\n<p>L\u1ee3i \u00edch ch\u00ednh c\u1ee7a OFDMA l\u00e0 n\u00f3 cho ph\u00e9p m\u1ed9t Access Point ph\u00e2n b\u1ed5 to\u00e0n b\u1ed9 k\u00eanh cho m\u1ed9t ng\u01b0\u1eddi d\u00f9ng duy nh\u1ea5t t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m ho\u1eb7c n\u00f3 c\u00f3 th\u1ec3 ph\u00e2n v\u00f9ng m\u1ed9t k\u00eanh \u0111\u1ec3 ph\u1ee5c v\u1ee5 nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng \u0111\u1ed3ng th\u1eddi. OFDMA l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng b\u0103ng th\u00f4ng th\u1ea5p v\u00e0 d\u1eabn \u0111\u1ebfn t\u00e1i s\u1eed d\u1ee5ng t\u1ea7n s\u1ed1 t\u1ed1t h\u01a1n, gi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 t\u0103ng hi\u1ec7u qu\u1ea3.<\/p>\n<p><strong>MU -MIMO<\/strong><\/p>\n<p>Multi User \u2013 Multiple Input Multiple Output l\u00e0 c\u00f4ng ngh\u1ec7 \u0111a ng\u01b0\u1eddi d\u00f9ng, nhi\u1ec1u ng\u00f5 v\u00e0o, nhi\u1ec1u ng\u00f5 ra \u2013 cho ph\u00e9p Access Point giao ti\u1ebfp v\u1edbi nhi\u1ec1u thi\u1ebft b\u1ecb \u0111\u1ed3ng th\u1eddi. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m th\u1eddi gian khi m\u1ed7i thi\u1ebft b\u1ecb ph\u1ea3i ch\u1edd t\u00edn hi\u1ec7u, l\u00e0m t\u0103ng t\u1ed1c \u0111\u00e1ng k\u1ec3 t\u1ed1c \u0111\u1ed9 truy c\u1eadp m\u1ea1ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-656 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/mumo-e1621827464229.png\" alt=\"-\" width=\"641\" height=\"378\"><\/p>\n<p><strong>BSS Color<\/strong><\/p>\n<p>BSS Color (Basic Service Set Coloring) m\u1ea1ng t\u1ef1 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ea1ng WLAN kh\u00e1c, gi\u1ea3m thi\u1ec3u xung \u0111\u1ed9t v\u00e0 nhi\u1ec5u s\u00f3ng v\u00f4 tuy\u1ebfn tr\u00ean c\u00f9ng m\u1ed9t k\u00eanh. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn s\u1ef1 \u1ed5n \u0111\u1ecbnh h\u01a1n v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t h\u01a1n trong m\u00f4i tr\u01b0\u1eddng m\u1eadt \u0111\u1ed9 cao.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-655 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/bss-e1621827502536.png\" alt=\"-\" width=\"641\" height=\"378\"><\/p>\n<p><strong>TWT \u2013 Target Wake Time<\/strong><\/p>\n<p>Th\u1eddi gian \u0111\u00e1nh th\u1ee9c m\u1ee5c ti\u00eau\u00a0 (TWT) cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb x\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m v\u00e0 t\u1ea7n su\u1ea5t ch\u00fang s\u1ebd th\u1ee9c d\u1eady \u0111\u1ec3 g\u1eedi v\u00e0 nh\u1eadn d\u1eef li\u1ec7u. V\u1ec1 c\u01a1 b\u1ea3n, \u0111i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c Access Point t\u0103ng hi\u1ec7u qu\u1ea3 th\u1eddi gian ng\u1ee7 c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 ti\u1ebft ki\u1ec7m \u0111\u00e1ng k\u1ec3 tu\u1ed5i th\u1ecd PIN, m\u1ed9t t\u00ednh n\u0103ng \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi IoT.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-659 size-full\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/twt-e1621827530180.png\" alt=\"-\" width=\"641\" height=\"377\"><\/p>\n<p><strong>WPA3<\/strong><\/p>\n<p>WPA3 b\u1ed5 sung c\u00e1c t\u00ednh n\u0103ng m\u1edbi \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n h\u00f3a b\u1ea3o m\u1eadt cho WiFi, cho ph\u00e9p x\u00e1c th\u1ef1c m\u1ea1nh m\u1ebd h\u01a1n, cung c\u1ea5p s\u1ee9c m\u1ea1nh m\u00e3 h\u00f3a m\u1ea1nh h\u01a1n cho c\u00e1c th\u1ecb tr\u01b0\u1eddng c\u00f3 d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m v\u00e0 duy tr\u00ec kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i m\u1ea1ng \u2013 \u0111\u00e2y l\u00e0 \u0111i\u1ec1u b\u1eaft bu\u1ed9c trong WiFi-6.<\/p>\n<p><img decoding=\"async\" class=\"wp-image-662 size-full aligncenter\" src=\"https:\/\/ttsi.com.vn\/wp-content\/uploads\/2021\/05\/wpa3-e1621827574428.png\" alt=\"-\" width=\"641\" height=\"377\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u01a1 l\u01b0\u1ee3c v\u1ec1 c\u00e1c chu\u1ea9n WiFi hi\u1ec7n nay C\u00f4ng ngh\u1ec7 Internet kh\u00f4ng d\u00e2y \u0111\u00e3 kh\u00f4ng ng\u1eebng ph\u00e1t tri\u1ec3n k\u1ec3 t\u1eeb khi ra \u0111\u1eddi. Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 WiFi-6, c\u00e1c b\u1ea1n n\u00ean d\u00e0nh v\u00e0i ph\u00fat \u0111\u1ec3 \u0111\u1ecdc nhanh s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a WiFi. T\u1eeb \u0111\u00f3, ch\u00fang ta s\u1ebd th\u1ea5y \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t v\u00e0 c\u00e1c [&#8230;]\n","protected":false},"author":2,"featured_media":664,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-389","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"acf":[],"_links":{"self":[{"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=389"}],"version-history":[{"count":5,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions"}],"predecessor-version":[{"id":682,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions\/682"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=\/wp\/v2\/media\/664"}],"wp:attachment":[{"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ttsi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}