Error Correction
Once detected, the error must be corrected
Error correction techniques
- Retransmission (a.k.a, Backward error correction)
- Simplest, most effective, least expensive, most commonly used
- Corrected by retransmission of the data
- Receiver, when detecting an error, asks the sender to retransmit the message
- Often called Automatic Repeat Request (ARQ)
- Forward Error Correction
- Receiving device can correct incoming messages itself