| 摘要 |
PURPOSE:To make a frequency switching operation classified by every zone at a mobile station by using the same frequency repeatedly effectively and to reduce a load on a processing by employing an intermittent minimum zone system. CONSTITUTION:An area whose service area i.e. the size of the zone 20 is remarkably small compared with the arranging interval of a road station 10 and in which no mobile station loaded on a subscriber vehicle 12 reacts according to a radio wave 18 transmitted from the road station 10 actually i.e. no radio area exists. Therefore, in such intermittent minimum zone system, the same frequency can be used effectively repeatedly on an adjacent road station 20. In such a way, it is possible to make the switching control of the frequency at every zone unnecessary by the mobile station, and to reduce the load on the processing. |
