Method of detecting troubles in a receiver for a common control channel of a mobile radio telephone communication system and a system therefor
First Claim
1. In a mobile radio telephone system of the type having mobile stations;
- base stations, each base station having a plurality of speech channel transmitter/receivers to transmit and receive signals through a speech channel and an access channel transmitter/receiver to control calls from said mobile stations through an access channel; and
a central station for connecting said mobile stations and a telephone exchange network or said mobile station with each other by way of said base stations, the improvement comprising;
means for detecting from the output of said access channel receiver a calling signal from said mobile station and a test calling signal and providing a detection output in response to said calling signal and said test calling signal; and
control means connected to the output of said detecting means for transmitting said test calling signal to the last-mentioned access channel receiver if the detection output of said detecting means is not received within a first predetermined interval of time and, for generating a trouble signal if said detection output is not received within a second predetermined interval of time, after the transmission of said test calling signal, said second predetermined interval of time being shorter than said first predetermined interval of time.
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Accused Products
Abstract
A mobile radio system having apparatus for monitoring problems in the access channel receiver of a base station. The output of the access channel receiver of a base station is linked directly, or indirectly via an access channel data receiver in a control center, to a test apparatus. The test apparatus monitors the signals linked thereto and in this manner determines that signals are passing through the access channel receiver. If no signal is received at the test apparatus within a first predetermined time it transmits to the base station a test signal designed to be received by the base station access channel receiver. If the access channel receiver is operating correctly it will receive the test signal and a signal will be linked to the test apparatus. If the access channel receiver is not operating correctly no signal will be linked to the test apparatus, and if the test apparatus does not receive the test signal from the output of the access channel receiver within a second predetermined time after the transmission of the test signal, the test apparatus will provide an output indicating that a problem exists in the access channel receiver.
41 Citations
8 Claims
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1. In a mobile radio telephone system of the type having mobile stations;
- base stations, each base station having a plurality of speech channel transmitter/receivers to transmit and receive signals through a speech channel and an access channel transmitter/receiver to control calls from said mobile stations through an access channel; and
a central station for connecting said mobile stations and a telephone exchange network or said mobile station with each other by way of said base stations, the improvement comprising;means for detecting from the output of said access channel receiver a calling signal from said mobile station and a test calling signal and providing a detection output in response to said calling signal and said test calling signal; and control means connected to the output of said detecting means for transmitting said test calling signal to the last-mentioned access channel receiver if the detection output of said detecting means is not received within a first predetermined interval of time and, for generating a trouble signal if said detection output is not received within a second predetermined interval of time, after the transmission of said test calling signal, said second predetermined interval of time being shorter than said first predetermined interval of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- base stations, each base station having a plurality of speech channel transmitter/receivers to transmit and receive signals through a speech channel and an access channel transmitter/receiver to control calls from said mobile stations through an access channel; and
Specification