| 摘要 |
<p>A data transmission system having a first station and a second station, the first station acting to divide data into a plurality of sections and thereafter add sequential transmission number thereto to create a frame or frames to transmit the same, and the second station acting to receive the frame or frames. Also, in the case where the second station cannot receive several frames normally, the number of frames, on which an error is caused, being consecutive is compared with a threshold. In the case where the number is equal to or more than the threshold, the second station demands from the first station re-transmission in the GBN mode, in which all data numbered subsequent to a specified transmission number are transmitted, and in the case where the number is less than the threshold, the second station demands from the first station re-transmission in the SR mode, in which only a specified transmission number is transmitted. In addition, the threshold is set to be optimum taking account of a resource and performances in accordance with a status of data transmission. <IMAGE></p> |
