Automatic Repeat Request
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Automatic Repeat reQuest (ARQ), also known as Automatic Repeat Query, is an error control|error-control method for data transmission that uses acknowledgement (data networks)|acknowledgements (messages sent by the receiver indicating that it has correctly received a data frame or Packet (information technology)|packet) and Timeout (computing)|timeouts (specified periods of time allowed to elapse before an acknowledgment is to be received) to achieve reliable data transmission over an unreliable service. If the sender does not receive an acknowledgment before the timeout, it usually Retransmission (data networks)|re-transmits the frame/packet until the sender receives an acknowledgment or exceeds a predefined number of re-transmissions. The types of ARQ protocols include * Stop-and-wait ARQ * Go-Back-N ARQ * Selective Repeat ARQ All three protocols usually use some form of sliding window protocol to tell the transmitter determine which (if any) packets need to be retransmitted. These...
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