| 摘要 |
A mobile radio telephone system has line connection units (34) connected on the one hand to a telephone network (30) and also by lines (35) to radio connection devices (33) which communicate by radio with radio telephone sets (32). Each line connection unit has a subscriber's file (46) identifying which radio telephone sets are located in which of several zones served by the line connection unit. For starting a location information registration operation to enter information concerning the mobile radio telephone sets into the subscriber's file, each radio telephone set is provided with a travel measuring unit (80). The radio telephone set produces a request signal for the location information registration when the travel amount measured exceeds a first threshold value. Alternatively, the radio telephone set resets the measuring unit when the travel amount measured exceeds a first threshold value and thereafter produces a request signal for the location information registration when the travel amount measured goes below a second threshold value smaller than the first threshold value. The radio connection devices broadcast location information signals, and each radio telephone set holds its location information registered in the subscriber's file. When the telephone set receives one of the location information signals which has a location information different from the location information it holds, the radio telephone set produces another request for registration of the different location information. <IMAGE> |
