IN-USE CHANNEL CONTROLLING METHOD OF MOBILE RATIO COMMUNICATION SYSTEM

摘要

PURPOSE:To secure the communication quality of all channels and to utilize even a channel having a disturbing wave effectively by switching a call to a channel with a low disturbing wave level when the ratio of a desired wave level and a disturbing wave level decreases below a specific value. CONSTITUTION:A base station receive wave is inputted from a terminal 11 and mixed by a mixing circuit 12 with a local oscillation frequency signal from a local oscillation circuit 13 to obtain an intermediate frequency band signal. This signal is branched into three, and one is passed through a band-pass filter 14 where a sound modulated spectrum passes to demodulate a voice signal by a demodulator 15. This is outputted to a terminal 18. Other intermediate frequency band signals are supplied to receiving circuits 16 and 17 for pilot signals f1 and f2 to receive components of frequencies f1 and f2, thereby knowing the desired wave level and disturbing wave level by the levels of the received components. When a call in communication is switched to another channel, the service channel switching procedure of the current car telephone system is applied as it is.