| 摘要 |
<p>PURPOSE:To avoid collision between a re-transmission data and a new transmission data by re-transmitting a collision data efficiently. CONSTITUTION:Each time slot accessed by a peripheral station in the random access system consists of a mini-slot part and a data slot part. When a data A1(B1) is sent in a 1st slot (data slot part) of a frame 1 by a peripheral station T1(T2), the signal is sent in a mini-slot M1(M4) selected optionally in the mini- slot part. A central station C monitors the mini-slot part, and since two mini- slots are used in the mini-slot part of the 1st slot of the frame 1, it is judged that collision takes place in the slot and a re-transmission slot is assigned. The peripheral stations T1, T2 select the re-transmission slot in the order of the position of the mini-slot used by the stations themselves and send collision data A1', B1' again. When other peripheral station T3 sends a new data C1, the station selects a time slot (2nd slot of a frame 3) at which the station sends the data in random access from re-transmission use slot assign information.</p> |
