Radio tele-communication system using multichannel access scheme
First Claim
Patent Images
1. A radio tele-communication system comprising:
- a plurality of base stations connected to a network through wire lines, respectively;
a plurality of mobile stations connected to said base stations through radio channels;
a plurality of speech radio frequencies and at least one control radio frequency being shared by said base and mobile stations;
a signal transmitted at the speech radio frequencies being formatted such that each time frame is constituted by a plurality of time-divisionally multiplexed time slots; and
each of said mobile stations including;
first free state determining means for checking whether the control radio frequency can be used;
second free state determining means for checking whether each time slot of the plurality of speech radio frequencies is free; and
calling control means for performing a calling operation by selecting a radio channel used for the calling operation from free time slots of the plurality of speech radio frequencies and the control radio frequency on the basis of determination results from said first and second free state determining means.
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Abstract
In a radio tele-communication system of this invention, each mobile station is designed to determine whether a control radio frequency can be used and to determine whether any free time slots are included in the time slots of a plurality of speech radio frequencies. A calling operation is performed by selecting a radio channel for the calling operation from the free time slots of the plurality of speech radio frequencies and the control radio frequency on the basis of the determination results.
33 Citations
12 Claims
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1. A radio tele-communication system comprising:
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a plurality of base stations connected to a network through wire lines, respectively; a plurality of mobile stations connected to said base stations through radio channels; a plurality of speech radio frequencies and at least one control radio frequency being shared by said base and mobile stations; a signal transmitted at the speech radio frequencies being formatted such that each time frame is constituted by a plurality of time-divisionally multiplexed time slots; and each of said mobile stations including; first free state determining means for checking whether the control radio frequency can be used; second free state determining means for checking whether each time slot of the plurality of speech radio frequencies is free; and calling control means for performing a calling operation by selecting a radio channel used for the calling operation from free time slots of the plurality of speech radio frequencies and the control radio frequency on the basis of determination results from said first and second free state determining means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile station apparatus used in a radio tele-communication system including a plurality of base stations connected to a network through wire lines, respectively, and a plurality of mobile stations connected to said base stations through radio channels, a plurality of speech radio frequencies and at least one control radio frequency being shared by said base and mobile stations, and a signal transmitted at the speech radio frequencies being formatted such that each time frame is constituted by a plurality of time-divisionally multiplexed time slots, comprising:
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first free state determining means for checking whether the control radio frequency can be used; second free state determining means for checking whether each time slot of the plurality of speech radio frequencies is free; and calling control means for performing a calling operation by selecting a radio channel used for the calling operation from free time slots of the plurality of speech radio frequencies and the control radio frequency on the basis of determination results from said first and second free state determining means. - View Dependent Claims (8, 9, 10, 11)
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12. A radio tele-communication system comprising:
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a plurality of base stations connected to a network through wire lines, respectively; a plurality of mobile stations connected to said base stations through radio channels; a plurality of speech radio channels and at least one control radio channel being shared by said base and mobile stations; and each of said mobile stations including; first free state determining means for checking whether the control radio frequency can be used; second free state determining means for checking whether a free channel is present in the plurality of speech radio channels; and calling control means for performing a calling operation by selecting a radio channel used for the calling operation on the basis of determination results from said first and second free state determining means.
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Specification