CORDLESS TELEPHONE SYSTEM

摘要

PURPOSE:To preclude the possibility of collision of outgoing calls or incoming calls even under the environment where plural cordless telephone systems are used simultaneously by discriminating outgoing and incoming idle channels via 1st and 2nd reception circuits respectively. CONSTITUTION:A station incoming signal from a telephone line incoming to a speech circuit 10 is informed to a control circuit 4 and an outgoing radio circuit connection operation addressed to a mobile station 2 from a base station 1 is started. At first a 1st radio reception circuit 6 applies idle channel discrimination to detect the intensity of a radio wave to a radio circuit 3 inputted from an antenna 13 and when the check of an idle channel in the incoming line of a reception frequency of a base station 1 is not detected, a 2nd radio reception section 19 is operated and an idle outgoing line of a transmission frequency of the base station 1 is checked. Then an idle control channel as to both incoming and outgoing frequencies for the line 3 is discriminated. On the other hand, the processing above is similar to the mobile station 2 and collision of incoming and outgoing calls is prevented.