Delay performances of tandem stop‐and‐wait arq scheme

Abstract

AbstractThis paper considers the stop‐and‐wait ARQ scheme, which is the most fundamental error control method. The scheme is applied to the satellite tandem communication system composed of two links, and the average transmission delay is investigated.First, the tandem system with relay retransmission buffer with a finite capacity is considered, and the generating function for the transmission delay is derived. Using the obtained result, the effect of the buffer size of the relay node and the round‐trip propagation delay on the average transmission delay is investigated. It is shown as a result that the tandem‐type stop‐and‐wait ARQ scheme is better also in terms of the average transmission delay than the standard scheme without the relay‐retransmission buffer. The delay improving factor (the ratio of the average transmission delay to the average transmission delay providing the limit of the improvement with the infinite buffer size) is defined. A design principle is proposed for the buffer size, where not only the throughput but also the average transmission delay are considered.