olemus
tagasisidestatud veaparandus: saate kordamise taotlus, kui vastuvõtupoolel avastati viga
= an error-control method for data transmission that uses acknowledgements

ülevaateid
https://en.wikipedia.org/wiki/Automatic_repeat_request
https://www.computerlanguage.com/results.php?definition=automatic+repeat+request
https://theijes.com/papers/vol6-issue5/J0605016466.pdf
https://en.wikipedia.org/wiki/Hybrid_automatic_repeat_request

standardid
https://tools.ietf.org/html/rfc3366