{"id":582,"date":"2026-04-04T02:08:02","date_gmt":"2026-04-04T02:08:02","guid":{"rendered":"https:\/\/www.viz-tools.com\/vi\/uml-timing-diagrams-iot-guide\/"},"modified":"2026-04-04T02:08:02","modified_gmt":"2026-04-04T02:08:02","slug":"uml-timing-diagrams-iot-guide","status":"publish","type":"post","link":"https:\/\/www.viz-tools.com\/vi\/uml-timing-diagrams-iot-guide\/","title":{"rendered":"S\u1ee9c m\u1ea1nh \u1ea9n gi\u1ea5u c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian UML: T\u1ea1i sao ch\u00fang quan tr\u1ecdng h\u01a1n b\u1ea1n ngh\u0129 \u0111\u1ed1i v\u1edbi IoT"},"content":{"rendered":"

Trong th\u1ebf gi\u1edbi Internet v\u1ea1n v\u1eadt (IoT), th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1; n\u00f3 l\u00e0 m\u1ed9t ngu\u1ed3n l\u1ef1c c\u1ed1t l\u00f5i. C\u00e1c thi\u1ebft b\u1ecb giao ti\u1ebfp, c\u1ea3m bi\u1ebfn k\u00edch ho\u1ea1t h\u00e0nh \u0111\u1ed9ng, v\u00e0 b\u1ed9 x\u1eed l\u00fd qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean trong nh\u1eefng gi\u1edbi h\u1ea1n th\u1eddi gian nghi\u00eam ng\u1eb7t. Khi m\u1ed9t vi \u0111i\u1ec1u khi\u1ec3n b\u1ecf l\u1ee1 th\u1eddi h\u1ea1n, d\u1eef li\u1ec7u s\u1ebd b\u1ecb m\u1ea5t. Khi m\u1ed9t c\u1ed5ng giao ti\u1ebfp l\u00e0m ch\u1eadm t\u00edn hi\u1ec7u, h\u1ec7 th\u1ed1ng nh\u00e0 th\u00f4ng minh s\u1ebd tr\u1edf n\u00ean kh\u00f4ng ph\u1ea3n h\u1ed3i. \u0110\u1ec3 qu\u1ea3n l\u00fd nh\u1eefng gi\u1edbi h\u1ea1n quan tr\u1ecdng n\u00e0y, c\u00e1c k\u1ef9 s\u01b0 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a c\u1ee5 th\u1ec3 th\u01b0\u1eddng b\u1ecb b\u1ecf qua thay v\u00ec c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac ho\u1eb7c h\u00e0nh vi: s\u01a1 \u0111\u1ed3 th\u1eddi gian UML. \ud83d\udcc9<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 nhu c\u1ea7u k\u1ef9 thu\u1eadt v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1eddi gian trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 ph\u00e2n t\u00e1n. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1ch tr\u1ef1c quan h\u00f3a lu\u1ed3ng th\u1eddi gian c\u00f3 th\u1ec3 ng\u0103n ng\u1eeba nh\u1eefng l\u1ed7i t\u1ed1n k\u00e9m trong t\u00edch h\u1ee3p ph\u1ea7n c\u1ee9ng-ph\u1ea7n m\u1ec1m v\u00e0 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

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\"Line<\/figure>\n<\/div>\n

\ud83e\udd14 Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 th\u1eddi gian UML l\u00e0 g\u00ec?<\/h2>\n

S\u01a1 \u0111\u1ed3 th\u1eddi gian UML l\u00e0 m\u1ed9t lo\u1ea1i s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c t\u1eadp trung v\u00e0o c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian c\u1ee7a c\u00e1c tin nh\u1eafn \u0111\u01b0\u1ee3c trao \u0111\u1ed5i gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c th\u00e0nh ph\u1ea7n. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1, v\u1ed1n nh\u1ea5n m\u1ea1nh th\u1ee9 t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n, s\u01a1 \u0111\u1ed3 th\u1eddi gian nh\u1ea5n m\u1ea1nh tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian. N\u00f3 m\u00f4 t\u1ea3 khi n\u00e0o m\u1ed9t t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi, m\u1ea5t bao l\u00e2u \u0111\u1ec3 x\u1eed l\u00fd, v\u00e0 khi n\u00e0o tr\u1ea1ng th\u00e1i thay \u0111\u1ed5i x\u1ea3y ra.<\/p>\n

\u0110\u1ed1i v\u1edbi c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 IoT, s\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng. M\u1ed9t thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c l\u1ec7nh (th\u1ee9 t\u1ef1), nh\u01b0ng s\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd ti\u1ebft l\u1ed9 li\u1ec7u thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 ph\u1ea3n \u1ee9ng trong khung th\u1eddi gian 50 mili gi\u00e2y \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u b\u1edfi giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng hay quy tr\u00ecnh an to\u00e0n hay kh\u00f4ng.<\/p>\n

\ud83d\udee0 C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3<\/h3>\n
    \n
  • D\u00f2ng \u0111\u1eddi:<\/strong>Nh\u1eefng \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng \u0111\u1ea1i di\u1ec7n cho v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng, th\u00e0nh ph\u1ea7n ho\u1eb7c m\u00f4-\u0111un ph\u1ea7n c\u1ee9ng c\u1ee5 th\u1ec3. Trong IoT, ch\u00fang th\u01b0\u1eddng \u0111\u1ea1i di\u1ec7n cho c\u1ea3m bi\u1ebfn, vi \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c c\u1ed5ng m\u1ea1ng.<\/li>\n
  • Thanh th\u1eddi gian:<\/strong>Nh\u1eefng \u0111o\u1ea1n ngang tr\u00ean d\u00f2ng \u0111\u1eddi cho bi\u1ebft th\u1eddi gian m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c \u1edf tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3. Ch\u00fang th\u1ec3 hi\u1ec7n t\u1ea3i x\u1eed l\u00fd v\u00e0 chu k\u1ef3 ng\u1ee7.<\/li>\n
  • T\u00edn hi\u1ec7u:<\/strong>Nh\u1eefng m\u0169i t\u00ean ch\u1ec9 ra vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u ho\u1eb7c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n gi\u1eefa c\u00e1c d\u00f2ng \u0111\u1eddi.<\/li>\n
  • Thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i:<\/strong>Nh\u1eefng \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng cho th\u1ea5y s\u1ef1 chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng (v\u00ed d\u1ee5: t\u1eeb T\u1ea1m d\u1eebng<\/em> sang Ho\u1ea1t \u0111\u1ed9ng<\/em>).<\/li>\n
  • Gi\u00e1 tr\u1ecb th\u1eddi gian:<\/strong>Nh\u00e3n s\u1ed1 h\u1ecdc (v\u00ed d\u1ee5: 5ms<\/em>, 2s<\/em>) x\u00e1c \u0111\u1ecbnh c\u00e1c gi\u1edbi h\u1ea1n nghi\u00eam ng\u1eb7t cho c\u00e1c t\u01b0\u01a1ng t\u00e1c.<\/li>\n<\/ul>\n

    \u2699\ufe0f T\u1ea1i sao c\u00e1c h\u1ec7 th\u1ed1ng IoT \u0111\u00f2i h\u1ecfi m\u00f4 h\u00ecnh h\u00f3a theo th\u1eddi gian<\/h2>\n

    M\u00f4i tr\u01b0\u1eddng IoT v\u1ed1n d\u0129 \u0111a d\u1ea1ng. Ch\u00fang k\u1ebft h\u1ee3p vi \u0111i\u1ec1u khi\u1ec3n ti\u00eau th\u1ee5 \u00edt n\u0103ng l\u01b0\u1ee3ng v\u1edbi c\u00e1c giao th\u1ee9c m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y t\u1ea1o n\u00ean m\u1ed9t b\u1ed1i c\u1ea3nh th\u1eddi gian ph\u1ee9c t\u1ea1p. C\u00e1c m\u1eabu thi\u1ebft k\u1ebf th\u00f4ng th\u01b0\u1eddng th\u01b0\u1eddng kh\u00f4ng th\u1ec3 ghi nh\u1eadn \u0111\u1ed9 tr\u1ec5 do truy\u1ec1n d\u1eabn kh\u00f4ng d\u00e2y, x\u1eed l\u00fd ng\u1eaft ho\u1eb7c ch\u1ebf \u0111\u1ed9 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng g\u00e2y ra.<\/p>\n

    \ud83d\udd0b Qu\u1ea3n l\u00fd n\u0103ng l\u01b0\u1ee3ng v\u00e0 chu k\u1ef3 l\u00e0m vi\u1ec7c<\/h3>\n

    Nhi\u1ec1u n\u00fat IoT ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng pin. \u0110\u1ec3 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng, ch\u00fang chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 ng\u1ee7 n\u01a1i ch\u00fang kh\u00f4ng x\u1eed l\u00fd d\u1eef li\u1ec7u. S\u01a1 \u0111\u1ed3 th\u1eddi gian m\u00f4 h\u00ecnh h\u00f3a r\u00f5 r\u00e0ng qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i t\u1eeb ch\u1ebf \u0111\u1ed9 ng\u1ee7 sang tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

      \n
    • \u0110\u1ed9 tr\u1ec5 \u0111\u00e1nh th\u1ee9c:<\/strong>Th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 ph\u1ea7n c\u1ee9ng kh\u1edfi \u0111\u1ed9ng l\u1ea1i sau khi ph\u00e1t hi\u1ec7n t\u00edn hi\u1ec7u l\u00e0 bao l\u00e2u?<\/li>\n
    • Kho\u1ea3ng th\u1eddi gian truy\u1ec1n:<\/strong>B\u1ed9 ph\u00e1t v\u00f4 tuy\u1ebfn c\u00f3 s\u1eb5n s\u00e0ng truy\u1ec1n ngay khi th\u1ee9c d\u1eady kh\u00f4ng?<\/li>\n
    • Tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i ng\u1ee7:<\/strong>H\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i ti\u00eau th\u1ee5 \u00edt n\u0103ng l\u01b0\u1ee3ng nhanh \u0111\u1ebfn m\u1ee9c n\u00e0o \u0111\u1ec3 b\u1ea3o v\u1ec7 tu\u1ed5i th\u1ecd pin?<\/li>\n<\/ul>\n

      Kh\u00f4ng h\u00ecnh dung \u0111\u01b0\u1ee3c c\u00e1c chuy\u1ec3n ti\u1ebfp n\u00e0y, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf m\u1ed9t giao th\u1ee9c khi\u1ebfn b\u1ed9 ph\u00e1t v\u00f4 tuy\u1ebfn ho\u1ea1t \u0111\u1ed9ng qu\u00e1 l\u00e2u, l\u00e0m h\u1ebft pin ch\u1ec9 trong v\u00e0i ng\u00e0y thay v\u00ec v\u00e0i n\u0103m.<\/p>\n

      \ud83d\udce1 \u0110\u1ed9 tr\u1ec5 m\u1ea1ng v\u00e0 m\u1ea5t g\u00f3i tin<\/h3>\n

      C\u00e1c giao th\u1ee9c kh\u00f4ng d\u00e2y nh\u01b0 LoRaWAN, Zigbee ho\u1eb7c MQTT qua Wi-Fi g\u00e2y ra \u0111\u1ed9 tr\u1ec5 thay \u0111\u1ed5i. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap x\u00e1c \u0111\u1ecbnh ph\u1ea1m vi ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c cho c\u00e1c \u0111\u1ed9 tr\u1ec5 n\u00e0y.<\/p>\n

        \n
      • Th\u1eddi gian v\u00f2ng quay (RTT):<\/strong>Th\u1eddi gian t\u1eeb khi g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn khi nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn.<\/li>\n
      • Ng\u01b0\u1ee1ng th\u1eddi gian h\u1ebft h\u1ea1n:<\/strong>N\u1ebfu ph\u1ea3n h\u1ed3i kh\u00f4ng \u0111\u1ebfn trong v\u00f2ngX<\/em>mili gi\u00e2y, h\u1ec7 th\u1ed1ng ph\u1ea3i th\u1eed l\u1ea1i ho\u1eb7c th\u00f4ng b\u00e1o cho ng\u01b0\u1eddi d\u00f9ng.<\/li>\n
      • \u0110\u1ec7m:<\/strong>Tin nh\u1eafn c\u00f3 th\u1ec3 ch\u1edd trong h\u00e0ng \u0111\u1ee3i bao l\u00e2u tr\u01b0\u1edbc khi tr\u1edf n\u00ean l\u1ed7i th\u1eddi?<\/li>\n<\/ul>\n

        \ud83d\udcca S\u01a1 \u0111\u1ed3 th\u1eddi gian so v\u1edbi c\u00e1c m\u00f4 h\u00ecnh UML kh\u00e1c<\/h2>\n

        Hi\u1ec3u r\u00f5 s\u01a1 \u0111\u1ed3 th\u1eddi gian n\u1eb1m \u1edf \u0111\u00e2u trong s\u1ed1 c\u00e1c m\u00f4 h\u00ecnh kh\u00e1c l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ea7y \u0111\u1ee7 h\u1ec7 th\u1ed1ng. Trong khi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 th\u1ec3 hi\u1ec7n lu\u1ed3ng, s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u1ec3 hi\u1ec7n c\u00e1c r\u00e0ng bu\u1ed9c.<\/p>\n\n\n\n\n\n\n\n\n
        Lo\u1ea1i s\u01a1 \u0111\u1ed3<\/th>\nTr\u1ecdng t\u00e2m ch\u00ednh<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t trong IoT<\/th>\n<\/tr>\n<\/thead>\n
        S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/strong><\/td>\nTh\u1ee9 t\u1ef1 c\u00e1c tin nh\u1eafn<\/td>\nX\u00e1c \u0111\u1ecbnh giao th\u1ee9c trao \u0111\u1ed5i gi\u1eefa c\u1ea3m bi\u1ebfn v\u00e0 m\u00e1y ch\u1ee7 \u0111\u00e1m m\u00e2y.<\/td>\n<\/tr>\n
        M\u00e1y tr\u1ea1ng th\u00e1i<\/strong><\/td>\nChuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i<\/td>\nQu\u1ea3n l\u00fd c\u00e1c tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng c\u1ee7a kh\u00f3a th\u00f4ng minh (Kh\u00f3a, M\u1edf kh\u00f3a, M\u1edf).<\/td>\n<\/tr>\n
        S\u01a1 \u0111\u1ed3 th\u1eddi gian<\/strong><\/td>\nTh\u1eddi l\u01b0\u1ee3ng v\u00e0 th\u1eddi h\u1ea1n<\/td>\n\u0110\u1ea3m b\u1ea3o b\u00e1o \u0111\u1ed9ng an to\u00e0n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t trong v\u00f2ng 100ms k\u1ec3 t\u1eeb khi c\u1ea3m bi\u1ebfn ch\u00e1y \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t.<\/td>\n<\/tr>\n
        S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng<\/strong><\/td>\nLogic quy tr\u00ecnh l\u00e0m vi\u1ec7c<\/td>\nB\u1ea3n \u0111\u1ed3 h\u00f3a c\u00e1c b\u01b0\u1edbc logic trong quy tr\u00ecnh c\u1eadp nh\u1eadt ph\u1ea7n m\u1ec1m.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        L\u01b0u \u00fd s\u1ef1 kh\u00e1c bi\u1ec7t. N\u1ebfu b\u1ea1n ch\u1ec9 m\u00f4 h\u00ecnh h\u00f3a th\u1ee9 t\u1ef1 c\u1ee7a c\u00e1c tin nh\u1eafn, b\u1ea1n c\u00f3 th\u1ec3 b\u1ecf l\u1ee1 th\u1ef1c t\u1ebf l\u00e0 tin nh\u1eafn \u0111\u1ebfn qu\u00e1 mu\u1ed9n \u0111\u1ec3 c\u00f3 \u00edch. S\u01a1 \u0111\u1ed3 Th\u1eddi gian s\u1ebd l\u1ea5p \u0111\u1ea7y kho\u1ea3ng tr\u1ed1ng \u0111\u00f3.<\/p>\n

        \ud83d\ude80 C\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf: Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng ph\u00e2n t\u00edch th\u1eddi gian<\/h2>\n

        Kh\u00f4ng ph\u1ea3i th\u00e0nh ph\u1ea7n n\u00e0o c\u0169ng c\u1ea7n m\u00f4 h\u00ecnh th\u1eddi gian chi ti\u1ebft. Tuy nhi\u00ean, m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng con IoT nh\u1ea5t \u0111\u1ecbnh \u0111\u00f2i h\u1ecfi x\u00e1c minh th\u1eddi gian nghi\u00eam ng\u1eb7t.<\/p>\n

        1. V\u00f2ng \u0111i\u1ec1u khi\u1ec3n th\u1eddi gian th\u1ef1c<\/h3>\n

        Trong IoT c\u00f4ng nghi\u1ec7p (IIoT), b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 ph\u1ea3i ph\u1ea3n h\u1ed3i t\u00edn hi\u1ec7u t\u1eeb b\u1ed9 m\u00e3 h\u00f3a. N\u1ebfu v\u00f2ng \u0111i\u1ec1u khi\u1ec3n qu\u00e1 ch\u1eadm, \u0111\u1ed9ng c\u01a1 c\u00f3 th\u1ec3 dao \u0111\u1ed9ng ho\u1eb7c v\u01b0\u1ee3t qu\u00e1 v\u1ecb tr\u00ed m\u1ee5c ti\u00eau. S\u01a1 \u0111\u1ed3 Th\u1eddi gian b\u1ea3n \u0111\u1ed3 h\u00f3a c\u00e1c chu k\u1ef3 \u0111\u1ecdc c\u1ea3m bi\u1ebfn, t\u00ednh to\u00e1n v\u00e0 ghi d\u1eef li\u1ec7u b\u1ed9 ch\u1ea5p h\u00e0nh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o th\u1eddi gian v\u00f2ng l\u1eb7p t\u1ed5ng th\u1ec3 lu\u00f4n d\u01b0\u1edbi ng\u01b0\u1ee1ng gi\u1edbi h\u1ea1n nghi\u00eam tr\u1ecdng.<\/p>\n

        2. C\u00e1c giao th\u1ee9c \u0111\u1ed3ng b\u1ed9 h\u00f3a<\/h3>\n

        Khi nhi\u1ec1u thi\u1ebft b\u1ecb c\u1ea7n ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed3ng b\u1ed9 (v\u00ed d\u1ee5: h\u1ec7 th\u1ed1ng \u0111\u00e8n th\u00f4ng minh trong s\u00e2n v\u1eadn \u0111\u1ed9ng ho\u1eb7c c\u00e1c c\u1ea3m bi\u1ebfn \u0111\u1ed3ng b\u1ed9 trong nh\u00e0 m\u00e1y), ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3. S\u01a1 \u0111\u1ed3 Th\u1eddi gian minh h\u1ecda s\u1ef1 l\u1ec7ch pha gi\u1eefa c\u00e1c \u0111\u1ed3ng h\u1ed3 v\u00e0 th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 l\u1ea1i ch\u00fang.<\/p>\n

        3. C\u1eadp nh\u1eadt qua kh\u00f4ng kh\u00ed (OTA)<\/h3>\n

        Vi\u1ec7c c\u1eadp nh\u1eadt ph\u1ea7n m\u1ec1m qua kh\u00f4ng d\u00e2y bao g\u1ed3m vi\u1ec7c t\u1ea3i xu\u1ed1ng m\u1ed9t kh\u1ed1i d\u1eef li\u1ec7u l\u1edbn, x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n v\u00e0 ghi nh\u1edb. Qu\u00e1 tr\u00ecnh n\u00e0y kh\u00f4ng \u0111\u01b0\u1ee3c l\u00e0m gi\u00e1n \u0111o\u1ea1n c\u00e1c ch\u1ee9c n\u0103ng quan tr\u1ecdng. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap x\u00e1c \u0111\u1ecbnh th\u1eddi gian ng\u01b0ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a \u0111\u01b0\u1ee3c ph\u00e9p cho m\u1ed9t thi\u1ebft b\u1ecb c\u1ee5 th\u1ec3 trong khung th\u1eddi gian c\u1eadp nh\u1eadt.<\/p>\n

        4. X\u1eed l\u00fd ng\u1eaft<\/h3>\n

        C\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o ng\u1eaft. M\u1ed9t ng\u1eaft \u01b0u ti\u00ean cao (nh\u01b0 s\u1ef1 c\u1ed1 m\u1ea5t \u0111i\u1ec7n) ph\u1ea3i \u01b0u ti\u00ean h\u01a1n m\u1ed9t t\u00e1c v\u1ee5 \u01b0u ti\u00ean th\u1ea5p (nh\u01b0 ghi nh\u1eadt k\u00fd d\u1eef li\u1ec7u). Vi\u1ec7c tr\u1ef1c quan h\u00f3a c\u00e1c \u0111i\u1ec3m \u01b0u ti\u00ean n\u00e0y \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng kh\u00f4ng b\u1ecf l\u1ee1 s\u1ef1 ki\u1ec7n quan tr\u1ecdng do qu\u00e1 tr\u00ecnh n\u1ec1n \u0111ang b\u1eadn.<\/p>\n

        \ud83e\udde9 C\u1ea5u tr\u00fac d\u1eef li\u1ec7u th\u1eddi gian<\/h2>\n

        \u0110\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 h\u1eefu \u00edch, b\u1ea1n ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a th\u1eddi gian. Vi\u1ec7c ch\u1ecdn \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng ph\u00f9 h\u1ee3p l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 r\u00f5 r\u00e0ng.<\/p>\n

          \n
        • V\u00f2ng \u0111\u1ed3ng h\u1ed3:<\/strong>D\u00f9ng cho c\u00e1c thao t\u00e1c n\u1ed9i b\u1ed9 c\u1ee7a b\u1ed9 x\u1eed l\u00fd. R\u1ea5t ch\u00ednh x\u00e1c, nh\u01b0ng mang t\u00ednh tr\u1eebu t\u01b0\u1ee3ng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf c\u1ea5p h\u1ec7 th\u1ed1ng.<\/li>\n
        • Miligi\u00e2y (ms):<\/strong>Ti\u00eau chu\u1ea9n cho \u0111\u1ed9 tr\u1ec5 c\u1ea5p \u1ee9ng d\u1ee5ng v\u00e0 truy\u1ec1n t\u1ea3i g\u00f3i m\u1ea1ng.<\/li>\n
        • Gi\u00e2y (s):<\/strong>D\u00f9ng cho t\u01b0\u01a1ng t\u00e1c v\u1edbi ng\u01b0\u1eddi d\u00f9ng v\u00e0 t\u00ednh to\u00e1n ti\u00eau hao pin.<\/li>\n
        • Ph\u00fat\/Gi\u1edd:<\/strong>D\u00f9ng cho c\u1eeda s\u1ed5 b\u1ea3o tr\u00ec, ghi nh\u1eadt k\u00fd d\u00e0i h\u1ea1n v\u00e0 c\u00e1c t\u00e1c v\u1ee5 theo l\u1ecbch.<\/li>\n<\/ul>\n

          Khi m\u00f4 h\u00ecnh h\u00f3a, tr\u00e1nh k\u1ebft h\u1ee3p c\u00e1c \u0111\u01a1n v\u1ecb tr\u00ean c\u00f9ng m\u1ed9t tr\u1ee5c tr\u1eeb khi c\u00f3 s\u1ef1 chuy\u1ec3n \u0111\u1ed5i r\u00f5 r\u00e0ng. T\u00ednh nh\u1ea5t qu\u00e1n s\u1ebd gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c cho \u0111\u1ed9i ng\u0169 k\u1ef9 s\u01b0.<\/p>\n

          \u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong m\u00f4 h\u00ecnh h\u00f3a th\u1eddi gian<\/h2>\n

          Vi\u1ec7c t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y kh\u00e1 \u0111\u01a1n gi\u1ea3n, nh\u01b0ng vi\u1ec7c t\u1ea1o rach\u00ednh x\u00e1c<\/em>nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. M\u1ed9t s\u1ed1 l\u1ed7i ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn th\u1ea5t b\u1ea1i trong tri\u1ec3n khai.<\/p>\n

          Gi\u1ea3 \u0111\u1ecbnh h\u00e0nh vi x\u00e1c \u0111\u1ecbnh<\/h3>\n

          Ph\u1ea7n m\u1ec1m ch\u1ea1y tr\u00ean h\u1ec7 \u0111i\u1ec1u h\u00e0nh m\u1ee5c \u0111\u00edch chung c\u00f3 th\u1ec3 kh\u00f4ng x\u00e1c \u0111\u1ecbnh. C\u00e1c ng\u1eaft, thu gom r\u00e1c ho\u1eb7c thi\u1ebfu cache c\u00f3 th\u1ec3 g\u00e2y ra \u0111\u1ed9 l\u1ec7ch th\u1eddi gian. S\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i ph\u1ea3n \u00e1nh th\u1eddi gian th\u1ef1c thi tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t<\/em> (WCET), ch\u1ee9 kh\u00f4ng ph\u1ea3i tr\u01b0\u1eddng h\u1ee3p trung b\u00ecnh. D\u1ef1a v\u00e0o gi\u00e1 tr\u1ecb trung b\u00ecnh trong c\u00e1c \u1ee9ng d\u1ee5ng IoT quan tr\u1ecdng v\u1ec1 an to\u00e0n l\u00e0 con \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn th\u1ea5t b\u1ea1i.<\/p>\n

          B\u1ecf qua c\u00e1c quy tr\u00ecnh n\u1ec1n<\/h3>\n

          Nhi\u1ec1u nh\u00e0 ph\u00e1t tri\u1ec3n m\u00f4 h\u00ecnh h\u00f3a lu\u1ed3ng th\u1ef1c thi ch\u00ednh nh\u01b0ng b\u1ecf qua c\u00e1c t\u00e1c v\u1ee5 n\u1ec1n. N\u1ebfu m\u1ed9t t\u00e1c v\u1ee5 ghi nh\u1eadt k\u00fd ch\u1ea1y \u0111\u1ed3ng th\u1eddi v\u1edbi t\u00e1c v\u1ee5 \u0111\u1ecdc c\u1ea3m bi\u1ebfn, th\u1eddi gian \u0111\u1ecdc c\u1ea3m bi\u1ebfn s\u1ebd b\u1ecb tr\u00ec ho\u00e3n. Lu\u00f4n ph\u1ea3i t\u00ednh \u0111\u1ebfn c\u00e1c lu\u1ed3ng song song trong s\u01a1 \u0111\u1ed3.<\/p>\n

          B\u1ecf qua \u0111\u1ed9 tr\u1ec5 ph\u1ea7n c\u1ee9ng<\/h3>\n

          Ph\u1ea7n m\u1ec1m kh\u00f4ng ch\u1ea1y trong ch\u00e2n kh\u00f4ng. M\u1ed9t c\u1ea3m bi\u1ebfn c\u00f3 th\u1ec3 m\u1ea5t 10ms \u0111\u1ec3 ph\u1ea3n \u1ee9ng v\u1eadt l\u00fd tr\u01b0\u1edbc khi g\u1eedi t\u00edn hi\u1ec7u s\u1ed1. M\u1ed9t bus truy\u1ec1n th\u00f4ng (nh\u01b0 I2C) c\u00f3 th\u1ec3 c\u00f3 \u0111\u1ed9 tr\u1ec5 c\u1ed1 \u0111\u1ecbnh cho m\u1ed7i byte. Nh\u1eefng \u0111\u1eb7c t\u00ednh ph\u1ea7n c\u1ee9ng n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o d\u01b0\u1edbi d\u1ea1ng c\u00e1c thanh th\u1eddi gian tr\u00ean c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng.<\/p>\n

          \ud83d\udcc8 C\u00e1c ch\u1ec9 s\u1ed1 \u0111\u1ec3 x\u00e1c minh th\u1eddi gian trong IoT<\/h2>\n

          Khi xem x\u00e9t m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian, h\u00e3y t\u00ecm c\u00e1c ch\u1ec9 s\u1ed1 c\u1ee5 th\u1ec3 n\u00e0y \u0111\u1ec3 x\u00e1c minh hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n\n\n\n\n\n\n
          Ch\u1ec9 s\u1ed1<\/th>\n\u0110\u1ecbnh ngh\u0129a<\/th>\nNg\u01b0\u1ee1ng th\u00f4ng th\u01b0\u1eddng cho IoT<\/th>\n<\/tr>\n<\/thead>\n
          \u0110\u1ed9 tr\u1ec5<\/strong><\/td>\nTh\u1eddi gian t\u1eeb s\u1ef1 ki\u1ec7n \u0111\u1ebfn ph\u1ea3n h\u1ed3i<\/td>\n< 100ms cho \u0111i\u1ec1u khi\u1ec3n, < 5s cho truy\u1ec1n d\u1eef li\u1ec7u gi\u00e1m s\u00e1t<\/td>\n<\/tr>\n
          \u0110\u1ed9 bi\u1ebfn thi\u00ean th\u1eddi gian<\/strong><\/td>\nS\u1ef1 bi\u1ebfn thi\u00ean v\u1ec1 th\u1eddi gian<\/td>\n\u01afu ti\u00ean \u0111\u1ed9 bi\u1ebfn thi\u00ean th\u1ea5p cho th\u1eddi gian th\u1ef1c<\/td>\n<\/tr>\n
          Chu k\u1ef3 l\u00e0m vi\u1ec7c<\/strong><\/td>\nT\u1ef7 l\u1ec7 th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng so v\u1edbi t\u1ed5ng th\u1eddi gian<\/td>\nT\u1ed1i \u01b0u h\u00f3a cho tu\u1ed5i th\u1ecd pin (v\u00ed d\u1ee5: 1%)<\/td>\n<\/tr>\n
          T\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u<\/strong><\/td>\nTh\u1ec3 t\u00edch d\u1eef li\u1ec7u tr\u00ean m\u1ed7i \u0111\u01a1n v\u1ecb th\u1eddi gian<\/td>\nPh\u1ee5 thu\u1ed9c v\u00e0o b\u0103ng th\u00f4ng m\u1ea1ng<\/td>\n<\/tr>\n
          Th\u1eddi gian ph\u1ee5c h\u1ed3i<\/strong><\/td>\nTh\u1eddi gian \u0111\u1ec3 kh\u00f4i ph\u1ee5c ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng sau s\u1ef1 c\u1ed1<\/td>\n< 1 gi\u00e2y cho kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          \ud83d\udee0 T\u00edch h\u1ee3p th\u1eddi gian v\u00e0o quy tr\u00ecnh ph\u00e1t tri\u1ec3n<\/h2>\n

          S\u01a1 \u0111\u1ed3 th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 t\u00e0i li\u1ec7u; ch\u00fang l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a logic thi\u1ebft k\u1ebf. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch t\u00edch h\u1ee3p ch\u00fang v\u00e0o v\u00f2ng \u0111\u1eddi k\u1ef9 thu\u1eadt.<\/p>\n

            \n
          • Giai \u0111o\u1ea1n Y\u00eau c\u1ea7u:<\/strong> X\u00e1c \u0111\u1ecbnh c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian trong t\u00e0i li\u1ec7u y\u00eau c\u1ea7u (v\u00ed d\u1ee5: \u201cH\u1ec7 th\u1ed1ng ph\u1ea3i ph\u1ea3n h\u1ed3i trong v\u00f2ng 200ms\u201d).<\/li>\n
          • Giai \u0111o\u1ea1n thi\u1ebft k\u1ebf:<\/strong> T\u1ea1o s\u01a1 \u0111\u1ed3 Th\u1eddi gian \u0111\u1ec3 x\u00e1c minh c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng b\u1edfi ki\u1ebfn tr\u00fac \u0111\u1ec1 xu\u1ea5t.<\/li>\n
          • Giai \u0111o\u1ea1n tri\u1ec3n khai:<\/strong> S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ec3 thi\u1ebft l\u1eadp b\u1ed9 \u0111\u1ebfm th\u1eddi gian ph\u1ea7n c\u1ee9ng v\u00e0 th\u1eddi gian ch\u1edd ph\u1ea7n m\u1ec1m.<\/li>\n
          • Ki\u1ec3m th\u1eed:<\/strong> So s\u00e1nh th\u1eddi gian \u0111o th\u1ef1c t\u1ebf v\u1edbi s\u01a1 \u0111\u1ed3. N\u1ebfu th\u1eddi gian \u0111o v\u01b0\u1ee3t qu\u00e1 s\u01a1 \u0111\u1ed3, thi\u1ebft k\u1ebf c\u1ea7n \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/li>\n
          • B\u1ea3o tr\u00ec:<\/strong> C\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3 khi ph\u1ea7n m\u1ec1m c\u00e0i \u0111\u1eb7t ho\u1eb7c thay \u0111\u1ed5i ph\u1ea7n c\u1ee9ng l\u00e0m thay \u0111\u1ed5i \u0111\u1eb7c t\u00ednh th\u1eddi gian.<\/li>\n<\/ul>\n

            \ud83d\udd0d Kh\u00e1m ph\u00e1 s\u00e2u: Ph\u00e2n t\u00edch c\u00e1c t\u01b0\u01a1ng t\u00e1c t\u00edn hi\u1ec7u<\/h2>\n

            H\u00e3y c\u00f9ng xem x\u00e9t m\u1ed9t m\u1eabu t\u01b0\u01a1ng t\u00e1c c\u1ee5 th\u1ec3 ph\u1ed5 bi\u1ebfn trong IoT: v\u00f2ng l\u1eb7p ki\u1ec3m tra (Polling Loop).<\/p>\n

            H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi vi \u0111i\u1ec1u khi\u1ec3n. Vi \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng s\u1eed d\u1ee5ng ng\u1eaft; n\u00f3 ki\u1ec3m tra c\u1ea3m bi\u1ebfn m\u1ed7i 100 mili gi\u00e2y.<\/p>\n

              \n
            1. D\u00f2ng s\u1ed1ng 1 (Vi \u0111i\u1ec1u khi\u1ec3n):<\/strong> G\u1eedi l\u1ec7nh \u0111\u1ecdc.<\/li>\n
            2. D\u00f2ng s\u1ed1ng 2 (C\u1ea3m bi\u1ebfn):<\/strong> T\u1ed1n 5ms \u0111\u1ec3 chu\u1ea9n b\u1ecb d\u1eef li\u1ec7u.<\/li>\n
            3. D\u00f2ng s\u1ed1ng 2 (C\u1ea3m bi\u1ebfn):<\/strong> G\u1eedi d\u1eef li\u1ec7u tr\u1edf l\u1ea1i (2ms).<\/li>\n
            4. D\u00f2ng s\u1ed1ng 1 (Vi \u0111i\u1ec1u khi\u1ec3n):<\/strong> X\u1eed l\u00fd d\u1eef li\u1ec7u (3ms).<\/li>\n
            5. D\u00f2ng s\u1ed1ng 1 (Vi \u0111i\u1ec1u khi\u1ec3n):<\/strong> Chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 ng\u1ee7 trong th\u1eddi gian c\u00f2n l\u1ea1i \u0111\u1ec3 \u0111\u1ea1t chu k\u1ef3 100ms.<\/li>\n<\/ol>\n

              S\u01a1 \u0111\u1ed3 Th\u1eddi gian tr\u1ef1c quan h\u00f3a kho\u1ea3ng tr\u1ed1ng n\u00e0y. N\u1ebfu vi \u0111i\u1ec1u khi\u1ec3n m\u1ea5t 60ms \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u thay v\u00ec 3ms, chu k\u1ef3 ng\u1ee7 s\u1ebd b\u1ecb thu h\u1eb9p v\u00e0 ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng t\u0103ng v\u1ecdt. Vi\u1ec7c tr\u1ef1c quan h\u00f3a n\u00e0y gi\u00fap c\u00e1c k\u1ef9 s\u01b0 ph\u00e1t hi\u1ec7n ra nh\u1eefng \u0111i\u1ec3m k\u00e9m hi\u1ec7u qu\u1ea3 tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 n\u00e0o.<\/p>\n

              \ud83c\udf10 H\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n v\u00e0 s\u1ef1 tr\u00f4i \u0111\u1ed3ng h\u1ed3<\/h2>\n

              Trong m\u1ed9t h\u1ec7 th\u1ed1ng IoT ph\u00e2n t\u00e1n, c\u00e1c thi\u1ebft b\u1ecb kh\u00f4ng chia s\u1ebb m\u1ed9t \u0111\u1ed3ng h\u1ed3 duy nh\u1ea5t. Ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o th\u1eddi gian m\u1ea1ng ho\u1eb7c dao \u0111\u1ed9ng n\u1ed9i b\u1ed9. Theo th\u1eddi gian, c\u00e1c \u0111\u1ed3ng h\u1ed3 n\u00e0y b\u1ecb tr\u00f4i.<\/p>\n

              S\u01a1 \u0111\u1ed3 Th\u1eddi gian gi\u00fap l\u1eadp k\u1ebf ho\u1ea1ch chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a. N\u00f3 cho th\u1ea5y khung th\u1eddi gian c\u01a1 h\u1ed9i \u0111\u1ec3 g\u1eedi g\u00f3i \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u00e0 th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 thi\u1ebft b\u1ecb nh\u1eadn \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed3ng h\u1ed3 n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3. N\u1ebfu \u0111\u1ed9 tr\u00f4i qu\u00e1 l\u1edbn, s\u01a1 \u0111\u1ed3 s\u1ebd nh\u1ea5n m\u1ea1nh nhu c\u1ea7u s\u1eed d\u1ee5ng giao th\u1ee9c m\u1ea1nh m\u1ebd h\u01a1n nh\u01b0 Precision Time Protocol (PTP) thay v\u00ec NTP ti\u00eau chu\u1ea9n.<\/p>\n

              \ud83d\udcc9 Tr\u1ef1c quan h\u00f3a t\u00ednh \u0111\u1ed3ng th\u1eddi<\/h2>\n

              C\u00e1c thi\u1ebft b\u1ecb IoT th\u01b0\u1eddng ch\u1ea1y nhi\u1ec1u t\u00e1c v\u1ee5 c\u00f9ng l\u00fac. S\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c t\u00e1c v\u1ee5 n\u00e0y ch\u1ea1y song song tr\u00ean c\u00f9ng m\u1ed9t d\u00f2ng s\u1ed1ng.<\/p>\n

                \n
              • Nhi\u1ec7m v\u1ee5 A:<\/strong> \u01afu ti\u00ean cao, ch\u1ea1y m\u1ed7i 10ms.<\/li>\n
              • Nhi\u1ec7m v\u1ee5 B:<\/strong> \u01afu ti\u00ean th\u1ea5p, ch\u1ea1y m\u1ed7i 100ms.<\/li>\n<\/ul>\n

                N\u1ebfu Nhi\u1ec7m v\u1ee5 B ch\u1ea1y trong 50ms, n\u00f3 s\u1ebd ch\u1eb7n Nhi\u1ec7m v\u1ee5 A trong kho\u1ea3ng th\u1eddi gian \u0111\u00f3. Bi\u1ec3u \u0111\u1ed3 cho th\u1ea5y n\u1ebfu Nhi\u1ec7m v\u1ee5 A b\u1ecf l\u1ee1 th\u1eddi h\u1ea1n. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng m\u00e0 vi\u1ec7c b\u1ecf l\u1ee1 th\u1eddi h\u1ea1n c\u00f3 th\u1ec3 g\u00e2y nguy hi\u1ec3m an to\u00e0n.<\/p>\n

                \ud83c\udfaf Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf<\/h2>\n

                Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 Th\u1eddi gian UML \u0111\u00f2i h\u1ecfi s\u1ef1 thay \u0111\u1ed5i trong t\u01b0 duy t\u1eeb “\u0111i\u1ec1u g\u00ec x\u1ea3y ra” sang “khi n\u00e0o n\u00f3 x\u1ea3y ra”. S\u1ef1 thay \u0111\u1ed5i n\u00e0y kh\u00f4ng \u0111\u01a1n gi\u1ea3n nh\u01b0ng l\u00e0 c\u1ea7n thi\u1ebft cho thi\u1ebft k\u1ebf IoT b\u1ec1n v\u1eefng.<\/p>\n

                  \n
                • B\u1eaft \u0111\u1ea7u \u0111\u01a1n gi\u1ea3n:<\/strong> \u0110\u1eebng m\u00f4 h\u00ecnh h\u00f3a t\u1eebng mili gi\u00e2y c\u1ee7a to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng. H\u00e3y t\u1eadp trung v\u00e0o c\u00e1c \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng tr\u01b0\u1edbc ti\u00ean.<\/li>\n
                • S\u1eed d\u1ee5ng k\u00fd hi\u1ec7u chu\u1ea9n:<\/strong> \u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh vi\u00ean trong nh\u00f3m hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c k\u00fd hi\u1ec7u. T\u00ednh nh\u1ea5t qu\u00e1n l\u00e0 ch\u00eca kh\u00f3a.<\/li>\n
                • X\u00e1c th\u1ef1c b\u1eb1ng d\u1eef li\u1ec7u:<\/strong> S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u th\u1eddi gian th\u1ef1c nh\u1eb1m tinh ch\u1ec9nh s\u01a1 \u0111\u1ed3.<\/li>\n
                • Truy\u1ec1n \u0111\u1ea1t c\u00e1c r\u00e0ng bu\u1ed9c:<\/strong> L\u00e0m cho c\u00e1c y\u00eau c\u1ea7u v\u1ec1 th\u1eddi gian tr\u1edf n\u00ean r\u00f5 r\u00e0ng v\u1edbi c\u00e1c k\u1ef9 s\u01b0 ph\u1ea7n c\u1ee9ng, ch\u1ee9 kh\u00f4ng ch\u1ec9 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m.<\/li>\n<\/ul>\n

                  B\u1eb1ng c\u00e1ch coi th\u1eddi gian nh\u01b0 m\u1ed9t y\u1ebfu t\u1ed1 h\u00e0ng \u0111\u1ea7u trong thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n, b\u1ea1n s\u1ebd gi\u1ea3m thi\u1ec3u r\u1ee7i ro v\u1ec1 l\u1ed7i \u0111\u1ed9 tr\u1ec5, s\u1ef1 c\u1ed1 ngu\u1ed3n \u0111i\u1ec7n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 \u0111\u1ed3ng b\u1ed9 h\u00f3a. C\u00f4ng s\u1ee9c b\u1ecf ra \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a d\u00f2ng th\u1eddi gian s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch l\u1edbn v\u1ec1 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng.<\/p>\n

                  \ud83d\udd17 T\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd<\/h2>\n
                    \n
                  • Nh\u1eadn th\u1ee9c v\u1ec1 th\u1eddi gian:<\/strong>C\u00e1c h\u1ec7 th\u1ed1ng IoT nh\u1ea1y c\u1ea3m v\u1edbi th\u1eddi gian. Nh\u1eefng \u0111\u1ed9 tr\u1ec5 \u0111\u1ec1u quan tr\u1ecdng.<\/li>\n
                  • R\u00f5 r\u00e0ng v\u1ec1 h\u00ecnh \u1ea3nh:<\/strong>S\u01a1 \u0111\u1ed3 th\u1eddi gian th\u1ec3 hi\u1ec7n c\u00e1c thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i theo th\u1eddi gian, b\u1ed5 sung cho s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1.<\/li>\n
                  • T\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean:<\/strong> Gi\u00fap c\u00e2n b\u1eb1ng nhu c\u1ea7u hi\u1ec7u su\u1ea5t v\u1edbi gi\u1edbi h\u1ea1n v\u1ec1 th\u1eddi l\u01b0\u1ee3ng pin.<\/li>\n
                  • X\u00e1c minh:<\/strong> Cung c\u1ea5p n\u1ec1n t\u1ea3ng \u0111\u1ec3 ki\u1ec3m th\u1eed v\u00e0 tinh ch\u1ec9nh hi\u1ec7u su\u1ea5t.<\/li>\n
                  • H\u1ee3p t\u00e1c:<\/strong>C\u1ea7u n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa gi\u1edbi h\u1ea1n ph\u1ea7n c\u1ee9ng v\u00e0 logic ph\u1ea7n m\u1ec1m.<\/li>\n<\/ul>\n

                    Khi b\u1ea1n thi\u1ebft k\u1ebf th\u1ebf h\u1ec7 thi\u1ebft b\u1ecb k\u1ebft n\u1ed1i ti\u1ebfp theo, \u0111\u1eebng b\u1ecf qua ph\u00e2n t\u00edch th\u1eddi gian. \u0110\u00f3 l\u00e0 l\u1edbp tin c\u1eady \u1ea9n gi\u1ea5u, \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng ch\u1ec9 v\u1ec1 m\u1eb7t logic, m\u00e0 c\u00f2n v\u1ec1 m\u1eb7t th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    Trong th\u1ebf gi\u1edbi Internet v\u1ea1n v\u1eadt (IoT), th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1; n\u00f3 l\u00e0 m\u1ed9t ngu\u1ed3n l\u1ef1c c\u1ed1t l\u00f5i. C\u00e1c thi\u1ebft b\u1ecb giao ti\u1ebfp, c\u1ea3m bi\u1ebfn k\u00edch…<\/p>\n","protected":false},"author":1,"featured_media":583,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 Th\u1eddi gian UML cho IoT: H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu \u23f1\ufe0f","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 l\u00fd do t\u1ea1i sao s\u01a1 \u0111\u1ed3 Th\u1eddi gian UML l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng IoT. H\u1ecdc c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed9 tr\u1ec5, chu k\u1ef3 ngu\u1ed3n \u0111i\u1ec7n v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian th\u1ef1c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[13],"tags":[39,43],"class_list":["post-582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 Th\u1eddi gian UML cho IoT: H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu \u23f1\ufe0f<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 l\u00fd do t\u1ea1i sao s\u01a1 \u0111\u1ed3 Th\u1eddi gian UML l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng IoT. 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