{"id":475909,"date":"2023-08-09T07:24:43","date_gmt":"2023-08-09T07:24:43","guid":{"rendered":""},"modified":"2023-09-05T11:11:33","modified_gmt":"2023-09-05T11:11:33","slug":"arq","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/arq\/","title":{"rendered":"ARQ"},"content":{"rendered":"

Y\u00eau c\u1ea7u l\u1eb7p l\u1ea1i t\u1ef1 \u0111\u1ed9ng (ARQ), c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Truy v\u1ea5n truy\u1ec1n l\u1ea1i t\u1ef1 \u0111\u1ed9ng, l\u00e0 m\u1ed9t giao th\u1ee9c li\u00ean l\u1ea1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ng m\u00e1y t\u00ednh \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady. N\u00f3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u01a1 s\u1edf ph\u00e1t hi\u1ec7n l\u1ed7i, trong \u0111\u00f3 c\u00e1c g\u00f3i d\u1eef li\u1ec7u l\u1ed7i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh v\u00e0 truy\u1ec1n l\u1ea1i, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a truy\u1ec1n th\u00f4ng d\u1eef li\u1ec7u.<\/p>\n

S\u1ef1 ra \u0111\u1eddi v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a ARQ<\/h2>\n

ARQ ra \u0111\u1eddi t\u1eeb nhu c\u1ea7u giao ti\u1ebfp \u0111\u00e1ng tin c\u1eady v\u00e0 kh\u00f4ng c\u00f3 l\u1ed7i trong m\u1ea1ng m\u00e1y t\u00ednh. \u1ee8ng d\u1ee5ng s\u1edbm nh\u1ea5t c\u1ee7a c\u01a1 ch\u1ebf ARQ \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y v\u00e0o nh\u1eefng n\u0103m 1960 d\u01b0\u1edbi d\u1ea1ng h\u1ec7 th\u1ed1ng th\u00f4ng tin v\u1ec7 tinh Echo I v\u00e0 Echo II. Giao th\u1ee9c Echo, m\u1ed9t s\u01a1 \u0111\u1ed3 ARQ \u0111\u01a1n gi\u1ea3n, \u0111\u1ea3m b\u1ea3o truy\u1ec1n d\u1eef li\u1ec7u th\u00e0nh c\u00f4ng gi\u1eefa ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn b\u1eb1ng c\u00e1ch truy\u1ec1n l\u1ea1i d\u1eef li\u1ec7u trong tr\u01b0\u1eddng h\u1ee3p c\u00f3 l\u1ed7i ho\u1eb7c thi\u1ebfu x\u00e1c nh\u1eadn.<\/p>\n

Qua nhi\u1ec1u n\u0103m, khi s\u1ee9c m\u1ea1nh t\u00ednh to\u00e1n ng\u00e0y c\u00e0ng t\u0103ng v\u00e0 c\u00e1c giao th\u1ee9c m\u1ea1ng ph\u00e1t tri\u1ec3n, c\u01a1 ch\u1ebf ARQ li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn, \u0111\u1ea1t \u0111\u1ebfn \u0111\u1ec9nh cao trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p m\u00e0 ch\u00fang ta c\u00f3 ng\u00e0y nay.<\/p>\n

S\u1ef1 hi\u1ec3u bi\u1ebft m\u1edf r\u1ed9ng v\u1ec1 ARQ<\/h2>\n

M\u1ee5c \u0111\u00edch c\u01a1 b\u1ea3n c\u1ee7a ARQ l\u00e0 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n ch\u00ednh x\u00e1c gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p c\u01a1 ch\u1ebf ph\u00e1t hi\u1ec7n l\u1ed7i, trong \u0111\u00f3 m\u1ed7i g\u00f3i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c k\u00e8m theo t\u1ed5ng ki\u1ec3m tra ho\u1eb7c m\u1ed9t d\u1ea1ng d\u1eef li\u1ec7u \u0111i\u1ec1u khi\u1ec3n kh\u00e1c m\u00e0 ng\u01b0\u1eddi nh\u1eadn s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem g\u00f3i c\u00f3 b\u1ecb h\u1ecfng trong qu\u00e1 tr\u00ecnh truy\u1ec1n hay kh\u00f4ng.<\/p>\n

N\u1ebfu d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c kh\u00f4ng c\u00f3 l\u1ed7i, ng\u01b0\u1eddi nh\u1eadn s\u1ebd g\u1eedi x\u00e1c nh\u1eadn (ACK) cho ng\u01b0\u1eddi g\u1eedi. N\u1ebfu g\u00f3i c\u00f3 l\u1ed7i, m\u1ed9t x\u00e1c nh\u1eadn ph\u1ee7 \u0111\u1ecbnh (NAK) s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi, nh\u1eafc ng\u01b0\u1eddi g\u1eedi truy\u1ec1n l\u1ea1i d\u1eef li\u1ec7u. N\u1ebfu ng\u01b0\u1eddi g\u1eedi kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn trong m\u1ed9t khung th\u1eddi gian c\u1ee5 th\u1ec3 (kho\u1ea3ng th\u1eddi gian ch\u1edd), n\u00f3 s\u1ebd cho r\u1eb1ng g\u00f3i b\u1ecb m\u1ea5t ho\u1eb7c b\u1ecb h\u1ecfng v\u00e0 truy\u1ec1n l\u1ea1i.<\/p>\n

ARQ v\u1eadn h\u00e0nh nh\u01b0 th\u1ebf n\u00e0o: C\u01a1 ch\u1ebf n\u1ed9i b\u1ed9<\/h2>\n

ARQ ho\u1ea1t \u0111\u1ed9ng tr\u00ean h\u1ec7 th\u1ed1ng ki\u1ec3m tra v\u00e0 c\u00e2n b\u1eb1ng gi\u1eefa ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u. C\u01a1 ch\u1ebf n\u00e0y bao g\u1ed3m ba b\u01b0\u1edbc thi\u1ebft y\u1ebfu:<\/p>\n

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  1. Truy\u1ec1n d\u1eef li\u1ec7u:<\/strong> Ng\u01b0\u1eddi g\u1eedi truy\u1ec1n g\u00f3i d\u1eef li\u1ec7u, c\u00f9ng v\u1edbi chu\u1ed7i \u0111i\u1ec1u khi\u1ec3n gi\u1ed1ng nh\u01b0 t\u1ed5ng ki\u1ec3m tra.<\/li>\n
  2. Ph\u00e1t hi\u1ec7n l\u1ed7i:<\/strong> Khi nh\u1eadn \u0111\u01b0\u1ee3c g\u00f3i d\u1eef li\u1ec7u, ng\u01b0\u1eddi nh\u1eadn s\u1ebd th\u1ef1c hi\u1ec7n ki\u1ec3m tra l\u1ed7i b\u1eb1ng chu\u1ed7i \u0111i\u1ec1u khi\u1ec3n.<\/li>\n
  3. X\u00e1c nh\u1eadn ho\u1eb7c truy\u1ec1n l\u1ea1i:<\/strong> T\u00f9y thu\u1ed9c v\u00e0o vi\u1ec7c ki\u1ec3m tra l\u1ed7i, ng\u01b0\u1eddi nh\u1eadn s\u1ebd g\u1eedi ACK ho\u1eb7c NAK. Trong tr\u01b0\u1eddng h\u1ee3p NAK ho\u1eb7c thi\u1ebfu x\u00e1c nh\u1eadn trong kho\u1ea3ng th\u1eddi gian ch\u1edd, ng\u01b0\u1eddi g\u1eedi s\u1ebd truy\u1ec1n l\u1ea1i g\u00f3i d\u1eef li\u1ec7u.<\/li>\n<\/ol>\n

    S\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c b\u01b0\u1edbc n\u00e0y \u0111\u1ea3m b\u1ea3o vi\u1ec7c truy\u1ec1n c\u00e1c g\u00f3i d\u1eef li\u1ec7u trong m\u1ea1ng th\u00e0nh c\u00f4ng v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n

    C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a ARQ<\/h2>\n

    M\u1ed9t s\u1ed1 t\u00ednh n\u0103ng n\u1ed5i b\u1eadt c\u1ee7a ARQ bao g\u1ed3m:<\/p>\n

      \n
    1. Truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady:<\/strong> ARQ \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c kh\u1edbp v\u1edbi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi, \u0111\u1ea3m b\u1ea3o giao ti\u1ebfp kh\u00f4ng c\u00f3 l\u1ed7i.<\/li>\n
    2. Ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda l\u1ed7i:<\/strong> N\u00f3 c\u00f3 c\u01a1 ch\u1ebf ph\u00e1t hi\u1ec7n l\u1ed7i t\u00edch h\u1ee3p v\u00e0 kh\u1ea3 n\u0103ng y\u00eau c\u1ea7u truy\u1ec1n l\u1ea1i, t\u1eeb \u0111\u00f3 s\u1eeda l\u1ed7i.<\/li>\n
    3. Ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng:<\/strong> B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u theo tr\u1ea1ng th\u00e1i x\u00e1c nh\u1eadn, ARQ \u0111i\u1ec1u ch\u1ec9nh t\u1eafc ngh\u1ebdn m\u1ea1ng.<\/li>\n<\/ol>\n

      C\u00e1c lo\u1ea1i ARQ: M\u1ed9t nghi\u00ean c\u1ee9u so s\u00e1nh<\/h2>\n

      ARQ c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n th\u00e0nh ba lo\u1ea1i ch\u00ednh: ARQ d\u1eebng v\u00e0 ch\u1edd, ARQ quay l\u1ea1i v\u00e0 ARQ l\u1eb7p l\u1ea1i c\u00f3 ch\u1ecdn l\u1ecdc.<\/p>\n\n\n\n\n\n\n\n
      C\u00e1c lo\u1ea1i ARQ<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n
      ARQ d\u1eebng v\u00e0 ch\u1edd<\/td>\nTrong ki\u1ec3u n\u00e0y, ng\u01b0\u1eddi g\u1eedi \u0111\u1ee3i x\u00e1c nh\u1eadn c\u1ee7a ng\u01b0\u1eddi nh\u1eadn sau khi g\u1eedi t\u1eebng g\u00f3i tr\u01b0\u1edbc khi g\u1eedi g\u00f3i ti\u1ebfp theo.<\/td>\nT\u1ed1t nh\u1ea5t cho c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01a1n gi\u1ea3n, quy m\u00f4 nh\u1ecf, n\u01a1i th\u1eddi gian kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed1i quan t\u00e2m \u0111\u00e1ng k\u1ec3.<\/td>\n<\/tr>\n
      ARQ quay l\u1ea1i-N<\/td>\nNg\u01b0\u1eddi g\u1eedi g\u1eedi m\u1ed9t lo\u1ea1t g\u00f3i m\u00e0 kh\u00f4ng ch\u1edd x\u00e1c nh\u1eadn nh\u01b0ng s\u1ebd truy\u1ec1n l\u1ea1i t\u1eeb g\u00f3i \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn cu\u1ed1i c\u00f9ng trong tr\u01b0\u1eddng h\u1ee3p ph\u00e1t hi\u1ec7n l\u1ed7i.<\/td>\nL\u00fd t\u01b0\u1edfng cho c\u00e1c m\u00f4i tr\u01b0\u1eddng c\u00f3 ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n d\u1eabn k\u00e9m tin c\u1eady h\u01a1n.<\/td>\n<\/tr>\n
      ARQ l\u1eb7p l\u1ea1i c\u00f3 ch\u1ecdn l\u1ecdc<\/td>\nCh\u1ec9 nh\u1eefng g\u00f3i c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n l\u00e0 c\u00f3 l\u1ed7i m\u1edbi \u0111\u01b0\u1ee3c truy\u1ec1n l\u1ea1i.<\/td>\nTh\u00edch h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao, n\u01a1i hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng l\u00e0 quan tr\u1ecdng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u00c1p d\u1ee5ng ARQ v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c th\u00e1ch th\u1ee9c li\u00ean quan<\/h2>\n

      ARQ t\u00ecm th\u1ea5y \u1ee9ng d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng kh\u00e1c nhau, bao g\u1ed3m m\u1ea1ng kh\u00f4ng d\u00e2y, truy\u1ec1n th\u00f4ng v\u1ec7 tinh v\u00e0 th\u1eadm ch\u00ed trong c\u00e1c giao th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u c\u01a1 b\u1ea3n nh\u01b0 Giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n truy\u1ec1n d\u1eabn (TCP) trong m\u1ea1ng m\u00e1y t\u00ednh.<\/p>\n

      Tuy nhi\u00ean, ARQ kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f4ng c\u00f3 th\u00e1ch th\u1ee9c. Vi\u1ec7c ch\u1edd \u0111\u1ee3i li\u00ean t\u1ee5c \u0111\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 vi\u1ec7c truy\u1ec1n l\u1ea1i c\u00e1c g\u00f3i s\u1ebd ti\u00eau t\u1ed1n th\u00eam b\u0103ng th\u00f4ng. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ARQ n\u00e2ng cao nh\u01b0 Go-Back-N v\u00e0 L\u1eb7p l\u1ea1i c\u00f3 ch\u1ecdn l\u1ecdc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n

      Ph\u00e2n t\u00edch so s\u00e1nh ARQ v\u1edbi c\u00e1c giao th\u1ee9c t\u01b0\u01a1ng t\u1ef1<\/h2>\n

      ARQ c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u kh\u00e1c nh\u01b0 S\u1eeda l\u1ed7i chuy\u1ec3n ti\u1ebfp (FEC) v\u00e0 ARQ lai (HARQ).<\/p>\n\n\n\n\n\n\n\n
      T\u00ednh n\u0103ng<\/th>\nARQ<\/th>\nFEC<\/th>\nHARQ<\/th>\n<\/tr>\n<\/thead>\n
      Ph\u00e1t hi\u1ec7n l\u1ed7i<\/td>\n\u0110\u00fang<\/td>\nKH\u00d4NG<\/td>\n\u0110\u00fang<\/td>\n<\/tr>\n
      S\u1eeda l\u1ed7i<\/td>\nC\u00f3, b\u1eb1ng c\u00e1ch truy\u1ec1n l\u1ea1i<\/td>\nC\u00f3, kh\u00f4ng c\u1ea7n truy\u1ec1n l\u1ea1i<\/td>\nC\u00f3, b\u1eb1ng c\u1ea3 hai ph\u01b0\u01a1ng ph\u00e1p<\/td>\n<\/tr>\n
      Hi\u1ec7u qu\u1ea3<\/td>\nTh\u1ea5p h\u01a1n khi t\u1ef7 l\u1ec7 l\u1ed7i cao<\/td>\nTh\u1ea5p h\u01a1n khi t\u1ef7 l\u1ec7 l\u1ed7i th\u1ea5p<\/td>\nCao trong c\u1ea3 hai tr\u01b0\u1eddng h\u1ee3p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      T\u01b0\u01a1ng lai c\u1ee7a ARQ: C\u00e1i nh\u00ecn v\u1ec1 c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi n\u1ed5i<\/h2>\n

      Khi truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y v\u00e0 di \u0111\u1ed9ng ph\u00e1t tri\u1ec3n th\u00ec ti\u1ec1m n\u0103ng c\u1ee7a ARQ c\u0169ng t\u0103ng theo. M\u1ed9t l\u0129nh v\u1ef1c tr\u1ecdng t\u00e2m ch\u00ednh l\u00e0 ph\u00e1t tri\u1ec3n c\u00e1c s\u01a1 \u0111\u1ed3 ARQ hi\u1ec7u qu\u1ea3 h\u01a1n, c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng li\u1ec1n m\u1ea1ch trong c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao, kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn nh\u01b0 5G tr\u1edf l\u00ean.<\/p>\n

      Trong b\u1ed1i c\u1ea3nh n\u00e0y, c\u00e1c phi\u00ean b\u1ea3n n\u00e2ng cao c\u1ee7a ARQ lai (HARQ), k\u1ebft h\u1ee3p nh\u1eefng \u01b0u \u0111i\u1ec3m t\u1ed1t nh\u1ea5t c\u1ee7a ARQ v\u00e0 S\u1eeda l\u1ed7i chuy\u1ec3n ti\u1ebfp (FEC), \u0111ang \u0111\u01b0\u1ee3c xem x\u00e9t cho c\u00e1c h\u1ec7 th\u1ed1ng li\u00ean l\u1ea1c kh\u00f4ng d\u00e2y trong t\u01b0\u01a1ng lai, cung c\u1ea5p c\u00e1c c\u01a1 ch\u1ebf truy\u1ec1n d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n

      ARQ trong l\u0129nh v\u1ef1c m\u00e1y ch\u1ee7 proxy<\/h2>\n

      Trong th\u1ebf gi\u1edbi m\u00e1y ch\u1ee7 proxy, ARQ \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng. L\u00e0 trung gian trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u, m\u00e1y ch\u1ee7 proxy th\u01b0\u1eddng t\u1eadn d\u1ee5ng c\u01a1 ch\u1ebf ARQ \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady.<\/p>\n

      \u0110\u1eb7c bi\u1ec7t trong tr\u01b0\u1eddng h\u1ee3p m\u1ea1ng kh\u00f4ng \u0111\u00e1ng tin c\u1eady ho\u1eb7c m\u00f4i tr\u01b0\u1eddng c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao, m\u00e1y ch\u1ee7 proxy h\u1ed7 tr\u1ee3 ARQ c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7. H\u1ecd c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd lu\u1ed3ng d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, ph\u00e1t hi\u1ec7n l\u1ed7i v\u00e0 k\u00edch ho\u1ea1t truy\u1ec1n l\u1ea1i khi c\u1ea7n thi\u1ebft, t\u1eeb \u0111\u00f3 mang l\u1ea1i tr\u1ea3i nghi\u1ec7m duy\u1ec7t web li\u1ec1n m\u1ea1ch cho ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i.<\/p>\n

      Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n
        \n
      1. ARQ \u2013 Wikipedia<\/a><\/li>\n
      2. Giao th\u1ee9c ARQ \u2013 M\u1ea1ng m\u00e1y t\u00ednh<\/a><\/li>\n
      3. ARQ trong Truy\u1ec1n th\u00f4ng Kh\u00f4ng d\u00e2y \u2013 ResearchGate<\/a><\/li>\n<\/ol>\n

        Nh\u00ecn chung, ARQ l\u00e0 m\u1ed9t giao th\u1ee9c quan tr\u1ecdng \u0111\u1ea3m b\u1ea3o vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady qua c\u00e1c m\u1ea1ng. Kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda l\u1ed7i c\u1ee7a n\u00f3 khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu trong l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 truy\u1ec1n th\u00f4ng ng\u00e0y c\u00e0ng ph\u00e1t tri\u1ec3n.<\/p>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-475909","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Automatic Repeat Request (ARQ): An In-Depth Overview<\/mark>","faq_items":[{"question":"What is the Automatic Repeat Request (ARQ)?","answer":"

        ARQ, also known as Automatic Retransmission Query, is a communication protocol used in computer networking to ensure reliable data transmission. It operates based on error detection, where erroneous data packets are identified and retransmitted to maintain data integrity.<\/p>"},{"question":"When was ARQ first introduced?","answer":"

        ARQ was first applied in the 1960s in the Echo I and Echo II satellite communication systems. Over the years, as computing power and networking protocols evolved, the ARQ mechanism has been continually refined.<\/p>"},{"question":"How does the ARQ mechanism operate?","answer":"

        ARQ operates through a system of checks and balances between the sender and receiver during data communication. It includes three crucial steps: data transmission, error detection, and either acknowledgment or retransmission. This interplay ensures successful and accurate transmission of data packets.<\/p>"},{"question":"What are the key features of ARQ?","answer":"

        The key features of ARQ include reliable data transfer, error detection and correction, and flow control. It ensures that the data received matches the data sent, has an in-built mechanism to request retransmission thus correcting errors, and regulates network congestion by controlling the data transmission rate.<\/p>"},{"question":"What are the different types of ARQ?","answer":"

        ARQ can be classified into three primary types: Stop-and-Wait ARQ, where the sender waits for the receiver's acknowledgment after each packet transmission; Go-Back-N ARQ, where the sender sends a series of packets without waiting for acknowledgment; and Selective Repeat ARQ, where only specific packets detected as erroneous are retransmitted.<\/p>"},{"question":"What are some applications and challenges of ARQ?","answer":"

        ARQ is used in various communication systems including wireless networks, satellite communication, and computer networking protocols like TCP. However, ARQ can slow down the data transmission rate due to the constant wait for acknowledgments and consume extra bandwidth due to packet retransmission. These issues are mitigated by using advanced ARQ strategies like Go-Back-N and Selective Repeat.<\/p>"},{"question":"How does ARQ compare with other similar protocols?","answer":"

        ARQ, along with Forward Error Correction (FEC) and Hybrid ARQ (HARQ), are data transmission methods. While ARQ and HARQ have error detection and correction capabilities, FEC can correct errors without retransmission. However, ARQ is less efficient when the error rate is high, and FEC is less efficient when the error rate is low, while HARQ remains efficient in both cases.<\/p>"},{"question":"What does the future hold for ARQ technology?","answer":"

        As wireless and mobile communication evolve, so does ARQ's potential. The focus is on developing more efficient ARQ schemes for high-speed, high-volume data transfer environments like 5G and beyond. Enhanced versions of Hybrid ARQ (HARQ) are being considered for future wireless communication systems.<\/p>"},{"question":"How are proxy servers associated with ARQ?","answer":"

        In the world of proxy servers, ARQ plays a critical role. As intermediaries in the data communication process, proxy servers often leverage ARQ mechanisms for reliable data transmission. They effectively manage the data flow, detect errors, and trigger retransmissions as necessary, providing a seamless browsing experience to end users.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/475909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/475909\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=475909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}