| 摘要 |
PURPOSE: To provide a frequency monitoring system in a mobile object communication system capable of executing inspection so as to detect an originating source of an illegal radio wave generated in a service area within a frequency band allocated to a communication business proprietor. CONSTITUTION: A control part 12 arranged in a switching center 1 instructs unused transmitting/receiving parts 9, 10 in a base station 2 to measure a receiving level in accordance with a signal outputted from a timer 36 at a fixed interval. A frequency measuring control part 31 successively reads out all frequency bands stored in a 2nd memory part 32 to be transmitted from mobile terminal equipments 4, 5 to the station 2 and controls the transmitting/receiving parts 9, 10 to measure the receiving levels of signals with the frequency bands. The measured results of the receiving levels are compared with a judgment value stored in a 3rd memory part 33 and an abnormal state of occurrence of a receiving level during communication though being unused is detected, stored in a 4th memory 34 and outputted to a maintenance device 15. |
