Web Reference: Dec 30, 2025 · It automatically detects lost or corrupted data packets and requests their retransmission, thereby improving the reliability of communication over unreliable networks. ARQ is a group of error-control protocols. It is used to achieve reliable data transfer over unreliable communication channels. Automatic Repeat Request (ARQ) is defined as a protocol that facilitates the retransmission of data packets in the event of errors, utilizing a window mechanism that allows for the transmission of multiple packets before receiving acknowledgments for earlier ones. May 2, 2019 · Whenever an error-free packet is received from A with a SN equal to RN, release received packet to higher layer and increment RN. At arbitrary times, but within bounded delay after receiving any error_free frame from A, transmit a frame to A containing RN in the request # field.
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