Radio mobile communication system wherein probability of loss of calls is reduced without a surplus of base station equipment
First Claim
1. In a mobile radio communication system comprising a control station and a plurality of base stations controlled by said control station and having service areas, respectively, each service area partly overlapping at least one of the other service areas, each base station being allotted with a plurality of channels for use in radio communication with a plurality of mobile stations which are present in the service area of said each base station and each of which has a communicable distance, the number of channels currently used in the radio communication defining a current traffic for said each base station, the improvement wherein:
- said control station comprises;
threshold means for generating a threshold signal representative of a threshold traffic predetermined for each base station;
measuring means coupled to said base stations for measuring the current traffics for the respective base stations to produce a plurality of traffic signals representative of the measured current traffics, respectively; and
monitoring means coupled to said base stations and responsive to said threshold signal and said traffic signals for monitoring the measured current traffics with at least one threshold traffic predetermined for said base stations to supply a traffic adjusting signal to a particular one of said base stations when the current traffic defined for said particular base station exceeds the threshold traffic predetermined therefor and furthermore when the current traffic defined for an adjacent one of said base stations, the service area of which partly overlaps the service area of said particular base station, does not exceed the threshold traffic for said adjacent base station;
said system further comprising varying means operable in at least a predetermined one of first and second modes of operation in response to said traffic adjusting signal, said varying means varying the service area of said particular base station in said first mode of operation, said service area being defined by each base station'"'"'s transmission output power, said varying means varying, in said second mode of operation, the communicable distance of each mobile station present in the service area of said particular base station.
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Accused Products
Abstract
In a mobile radio communication system, a control station supplies a traffic adjusting signal to a particular one of base stations, channels allotted to which are used up to a predetermined number in communication therethrough between the control station and mobile stations in the service area thereof provided that some of the channels allotted to an adjacent base station are idle. The signal narrows the service area of the particular base station as by reducing the base station output power. Alternatively, the signal varies a communicable distance of each mobile station in the service area of the particular base station. For example, the signal makes the particular base station raise the mobile station output power to make some of the mobile stations carry out the communication through the adjacent base station. As a further alternative, the signal varies both the service area and the communicable distance. For example, the signal makes the particular base station raise the reference level used in communication therethrough. Instead, a lower reference level is developed in each mobile station for use in communication through the adjacent base station.
73 Citations
5 Claims
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1. In a mobile radio communication system comprising a control station and a plurality of base stations controlled by said control station and having service areas, respectively, each service area partly overlapping at least one of the other service areas, each base station being allotted with a plurality of channels for use in radio communication with a plurality of mobile stations which are present in the service area of said each base station and each of which has a communicable distance, the number of channels currently used in the radio communication defining a current traffic for said each base station, the improvement wherein:
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said control station comprises; threshold means for generating a threshold signal representative of a threshold traffic predetermined for each base station; measuring means coupled to said base stations for measuring the current traffics for the respective base stations to produce a plurality of traffic signals representative of the measured current traffics, respectively; and monitoring means coupled to said base stations and responsive to said threshold signal and said traffic signals for monitoring the measured current traffics with at least one threshold traffic predetermined for said base stations to supply a traffic adjusting signal to a particular one of said base stations when the current traffic defined for said particular base station exceeds the threshold traffic predetermined therefor and furthermore when the current traffic defined for an adjacent one of said base stations, the service area of which partly overlaps the service area of said particular base station, does not exceed the threshold traffic for said adjacent base station; said system further comprising varying means operable in at least a predetermined one of first and second modes of operation in response to said traffic adjusting signal, said varying means varying the service area of said particular base station in said first mode of operation, said service area being defined by each base station'"'"'s transmission output power, said varying means varying, in said second mode of operation, the communicable distance of each mobile station present in the service area of said particular base station. - View Dependent Claims (2, 3, 4, 5)
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Specification