| 摘要 |
PURPOSE:To improve the operability and the reliability by utilizing a position registration function of each mobile radio equipment so as to correct a difference in time automatically. CONSTITUTION:When an area ID received from a base station of a mobile system is changed, a microprocessor 4 detects the ID stored in a nonvolatile memory 5 to be different at the time of performing preceding position registration. Then the processor 4 makes position registration with a base station to discriminate whether or not there is a difference in time between a district of the received area ID and a district of the area ID in the memory 5. When any the difference in time is in existence, the processor 4 sends information to correct the difference in time of a built-in clock to a clock circuit 6 for the correction and the result is displayed on a display device 7. Then the content of the memory 5 is revised by the received area ID. Thus, it is not required for the user to correct manually the difference in time at each occasion. |
