| 摘要 |
<p>PURPOSE:To improve collision frequency, and in addition, to reduce mean transmission delay time by providing a base station with a collision detecting means, an ACK signal generating means and a collision counting means, and providing a slave station with a receiving means and a time slot setting means, etc. CONSTITUTION:For a transmission line in which plural pieces unit of time slots time-divided at equal intervals constitutes a frame, plural slave stations 1 send information in synchronism with the time slot selected at random. In this case, the base station 2 detects collision by the collision detecting part 15, and the number of the collided time slots is counted by the collision counting part 17 through the ACK signal generating part 16, and is sent to the stations 1 together with an ACK signal by a transmitting part 18. Each of the stations 1 receives the signal of the station 2 by the receiving part 7, and reduces the number of the time slot through the time slot setting part 10 according as counted result increases, and in addition, in the case of the collision of the information its own station transmitted, it makes this information synchronize with the time slot set by the part 10 at random, and transmits it. Thus, the collision frequency can be improved, and simultaneously, the means transmission delay time can be reduced.</p> |
