| 摘要 |
PURPOSE:To improve the quality of data transmission by constituting a fixed station with a central fixed station and plural fixed stations which are remote-controlled by this fixed station and by controlling frequencies assigned to plural fixed stations and so on from the central fixed station. CONSTITUTION:Plural distributed fixed stations X1-X3 and Y1-Y3 are remote- controlled by central fixed station A0. The quality of receiving data from mobile stations a1-a4 which is previously measured for each of service areas A-W is stored in central fixed station A0. In case of transmission from fixed station A0 to mobile stations, station A0 determines designation of a distributed fixed station and the assigned frequency on the basis of the storage contents above so that they may be optimum, and station A0 remote-controls distributed fixed stations. Since central fixed station A0 controls assigned frequencies and so on of plural distributed fixed stations, following switching to an optimum frequency can be performed smoothly, so that the quality of data transmission can be improved. |
