Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
330 words
A control system for mobile radio communication comprising: a number of mobile stations, each transmitting a control signal indicative of transmission by a first common radio frequency wave; a plurality of base stations, each disposed in one of a plurality of small radio service zones respectively having an area in which communication can be sufficiently achieved with a radio transmission power of each mobile station, each base station having means for receiving the control signal from the mobile station in the corresponding one of the small radio service zones and means for regenerating the control signal in the form of a binary code; a plurality of fixed transmission lines, each transmitting the binary code regenerated by each of the plurality of base stations; and a control station connected to each of the plurality of fixed transmission lines for transmitting, in response to the binary code, an idle channel indication signal to each of the mobile stations in the whole service area including all of the plurality of small radio service zones at a second common radio frequency wave, the idle channel indication signal having first and second states indicative of busy and idle states of the first common radio frequency wave, respectively, each of said base stations including means for applying to the control station information indicative of the detection of transmission from one of the mobile stations in the small radio service zone of the base station by reversing the state of the binary code transmitted therefrom over the corresponding one of the fixed transmission lines, and said control station including means for establishing the idle channel indication signal to the first state in accordance with the reversal of the earliest one of the binary codes arriving from the base stations, and means for detecting initiation of restoration of the binary code control signal to its normal state, and means for changing the idle channel indication signal into the second state upon completion of reception of said control signal.
Claim 2
Dependent Claim
330 words
A control system for mobile radio communication comprising: a number of mobile stations, each transmitting a control signal indicative of transmission by a first common radio frequency wave; a plurality of base stations, each disposed in one of a plurality of small radio service zones respectively having an area in which communication can be sufficiently achieved with a radio transmission power of each mobile station, each base station having means for receiving the control signal from the mobile station in the corresponding one of the small radio service zones and means for regenerating the control signal in the form of a binary code; a plurality of fixed transmission lines, each transmitting the binary code regenerated by each of the plurality of base stations; and a control station connected to each of the plurality of fixed transmission lines for transmitting, in response to the binary code, an idle channel indication signal to each of the mobile stations in the whole service area including all of the plurality of small radio service zones at a second common radio frequency wave, the idle channel indication signal having first and second states indicative of busy and idle states of the first common radio frequency wave, respectively, each of said base stations including means for applying to the control station information indicative of the detection of transmission from one of the mobile stations in the small radio service zone of the base station by reversing the state of the binary code transmitted therefrom over the corresponding one of the fixed transmission lines, and said control station including means for establishing the idle channel indication signal to the first state in accordance with the reversal of the earliest one of the binary codes arriving from the base stations, and means for detecting initiation of restoration of the binary code control signal to its normal state, and means for changing the idle channel indication signal into the second state upon completion of reception of said control signal.
Claim 3
Dependent Claim
30 words
A control system for mobile radio communication according to claim 1, in which interruption and transmission of the idle channel indication signal corresponds to the first and second states, respectively.
Claim 4
Dependent Claim
37 words
A control system for mobile radio communication according to claim 1, in which said idle channel indication signal assumes two states detectable at each of said mobile stations as said first state and said second state, respectively.