| 摘要 |
<p>To enable an efficient cell search even in the case where a mobile station does not recognize scrambling sequences of accessible cells to which the mobile station has access rights. In a transmission method, a service area covered by a first cell is provided with a plurality of second cells with a smaller radius than the first cell. A first radio base station (10) belongs to a first cell while second radio base stations (20, 20) belong to different second cells. A transmitter (11) of the first radio base station transmits a synchronization channel in a given band while a transmitter (21, 21a) of each second radio base station transmits a synchronization channel in a band that is different from the given band and also from those of other second radio base stations. A control unit (31) of a mobile station narrows down bands to be observed for detecting synchronization channels to the given band or, if there are some of the second cells that the mobile stations are allowed to access, to the given band and the bands corresponding to the accessible second cells.</p> |
