Abstract: In a mobile phone system including plural base stations for transmitting logical control channel signals through transmission slots to which the same slot number in one frame is allocated, and a mobile phone for receiving the logical control channel signals through a reception slot to which the slot number corresponding to the transmission slots having the same slot number in the one frame is allocated, according to a handover method, each of the base stations transmits the logical control signal through the transmission slot to which the sane slot number in the one frame is allocated, and the mobile phone sets to a receivable state the reception slot to which the slot number corresponding to that of the transmission slot used when each of the plural base stations transmits the logical control channel is allocated, whereby the logical channel signal is received through the reception slot which is set to the receivable state, thereby performing handover.

Abstract: A digital cordless telephone system includes a plurality of radio base stations, a master unit, a subsidiary unit, a charging base, and a communication mode switching unit. The radio base stations are connected to a public line and each cover a certain service area. The master unit is connected to a personal line. The subsidiary unit is connected to a nearby radio base station or the master unit through a time-division multiplex radio channel to transmit/receive speech and control data. The charging base charges the subsidiary unit. The communication mode switching unit includes a detection section for detecting that the subsidiary unit is placed on the charging base, and a control section for automatically selecting whether to connect the subsidiary unit to a radio base station or the master unit depending on whether the subsidiary unit is placed on the charging base.