Delay performances of tandem go-back-n arq scheme

The performances (throughput and transmission delay) of the Go-back-N ARQ scheme are affected greatly by the bit error rate of the link and the round-trip propagation delay. This paper discusses the transmission delay of the tandem Go-back-N scheme, in which the round-trip propagation delay can substantially be reduced. First, the generating function for the transmission delay distribution is derived, and then the result is applied to derive the average transmission delay. As a result, it is shown clearly that the performance of the tandem Go-back-N ARQ scheme is better than that of the standard Go-back-N ARQ scheme.