H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/17, 379/2
H04B 3/60 (2006.01) H04B 7/26 (2006.01) H04B 17/00 (2006.01) H04M 3/24 (2006.01) H04Q 7/34 (2006.01)
Patent
CA 1182527
A B S T R A C T A mobile radio telephone system of the type having mobile subscriber stations, mobile base stations and a mobile control centre is described. Each mobile base station has several speech channel transmitter/receivers to trans- mit and receive signals respectively through several speech channels and an access channel transmitter/receiver to control calls from the mobile subscriber stations through an access channel. The mobile control centre is capable of enabling communication between the mobile subscriber stations and of connecting a telephone exchange network to the mobile subscriber stations by way of the mobile base stations. The invention involves the use of a detecting circuit connected to the output of the access channel receiver for detecting both a calling signal originated from the mobile subscriber stations and a test call- ing signal to provide a detection output, and a test transmitter responsive to a first control signal for transmitting the test calling signal to the access channel receiver through the access channel. Also included is a centre control- ler responsive to the test calling signal received by the access channel receiver for transmitting a first response signal to a test receiver through the access channel transmitter. The test receiver receives the first response signal transmitted from the access channel transmitter. Finally a controller is connected to the detecting circuit, test transmitter and receiver and centre controller for generating the first control signal when the detection output is not generated within a first predetermined interval of time and supplying a first alarm signal to the centre controller when the received first response signal is not received within a second predetermined interval of time after the transmission of the test calling signal.
401528
Kai Tomokazu
Nakahara Hidetoshi
Nippon Electric Co. Ltd.
Smart & Biggar
LandOfFree
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