AUTOMOBILE TELEPHONE EXCHANGING SYSTEM

摘要

PURPOSE:To prevent the automobile telephone of a cell site controlling station which is not in an overload state from being controlled and the capability of an entire automobile telephone exchanging system from being dropped by a partial overload by detecting overload states at every cell site controlling station and performing transmission control. CONSTITUTION:An exchange 1 houses automobile telephone sets 6 existing in the area to be controlled by the exchange 1 through the cell site controlling station 21 and 22 of each area and connects the telephone sets 6 to a public telephone network. A data linking device 7 connects the cell site controlling stations 21 and 22 with the exchange 1 through data links 3. An overload detecting circuits 8 are provided in the exchange 1 at every cell site controlling station and discriminates the overload state of one cell site controlling station when the time from the moment when the exchange sends a speech frequency moving request to the cell site controlling station to the moment when the moving completion report to the request is received exceeds a previously fixed standard time and counts the number of moving completion reports within the standard time. The circuit 8 performs transmission control when the number exceeds a fixed number against a prescribed number of speech frequency moving requests and cancels the control when the number goes to zero.