Abstract
We survey the data transmission models in a communication system from the viewpoint of reliability: data transmission often fails owing to errors generated by disconnections, noises or distortions in a communication line. To protect against such errors and to ensure accurate transmission of data, the following three schemes of error-control procedures are mainly used: (i) Forward-error-correction (FEC) scheme, (ii) automatic-repeat-request (ARQ) scheme, and (iii) hybrid ARQ schemes, which combines FEC with ARQ. ARQ schemes are mainly employed in data transmission systems to achieve high reliability of communication. Further, three protocols of stopand-wait (SW), go-back-N (GBN) and selective-repeat (SR) have been well known in ARQ schemes. In this chapter, we formulate three typical stochastic models of SW ARQ, SR ARQ and hybrid ARQ schemes, and discuss analytically and numerically optimal policies to improve the data throughput.
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