AUTOMATIC REPEAT REQUEST

Communications Systems Glossary

Communications Systems — Error detection and correction — Automatic repeat request

 

 

 

 

 

 

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Information on Automatic repeat request (ARQ)

Automatic repeat request (ARQ) is an error-control system in which a request for re-transmission is generated by the receiver when an error in transmission is detected. A number of systems can be used. In a simple system a positive acknowledgement (ACK) is returned when the data is received correctly and a negative acknowledgement (NACK) is returned when an error is detected. There are three main types of ARQ: stop-and-wait, go-back-N, and selective-reject.


Other topics in our resources on Communications Systems related to Automatic repeat request include: 
 
  • acknowledgement (Ack)
  • negative acknowledgement (NACK)
  • Forward Error Correction (FEC)
  • Error detecting code (EDC)
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  • Cyclic redundancy check (CRC)
  • Block code
  • Selective-reject automatic repeat request (Selective-reject ARQ)
  • Go-back-N automatic repeat request (Go-back-N ARQ)
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  • Cyclic code
  • Frame check sequence (FCS)
  • Stop-and-wait automatic repreat request (Stop-and-wait ARQ)
  • Convolutional code

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