THROUGHPUT ANALYSIS OF ARQ SCHEMES IN DIALOG COMMUNICATION OVER HALF-DUPLEX LINE

This paper studies the performance of a dialogue communication system which consists of two stations over a half-duplex line. When a station seizes the right to send its packets, it can consecutively transmits k packets. We analyze the transmission time of a message and the throu ghput performances of Stop-and-Wait, Go-back-N and Selective-Repeat pr otocols for the half-duplex line transmission system. Based on the ana lytical and numerical results, we clarify the influences of the switch ing and the thinking times, which exist in half-duplex line system, on the throughput performance, and give the optimal k which makes the th roughput to become maximum. It is observed that the throughput perform ances are greatly influenced not only by the switching and thinking ti mes but also by the average message length.