Radio station, transmitting station, and frequency band sharing method
First Claim
1. A transmitting station for transmitting a second radio communication system signal to a receiving station in a second radio communication system, using a shared frequency band which a first radio communication system uses in priority to the second radio communication system, comprising:
- an acquisition section that acquires load information of the first radio communication system;
a transmission determining section that estimates, based on the load information acquired in the acquisition section, an allowable interference level margin defined by a difference between an allowable interference level of a first radio communication system signal transmitted using the shared frequency band and a current interference level of the first radio communication system signal, and determines whether transmission of the second radio communication system signal using the shared frequency band is possible or not, based on whether or not the estimated allowable interference level margin is a predetermined value or more;
a predicted interference power calculating section that calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band; and
a broadcast section that broadcasts the predicted interference power calculated in the predicted interference power calculating section to the first radio communication system.
1 Assignment
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Accused Products
Abstract
The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system.
10 Citations
5 Claims
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1. A transmitting station for transmitting a second radio communication system signal to a receiving station in a second radio communication system, using a shared frequency band which a first radio communication system uses in priority to the second radio communication system, comprising:
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an acquisition section that acquires load information of the first radio communication system; a transmission determining section that estimates, based on the load information acquired in the acquisition section, an allowable interference level margin defined by a difference between an allowable interference level of a first radio communication system signal transmitted using the shared frequency band and a current interference level of the first radio communication system signal, and determines whether transmission of the second radio communication system signal using the shared frequency band is possible or not, based on whether or not the estimated allowable interference level margin is a predetermined value or more; a predicted interference power calculating section that calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band; and a broadcast section that broadcasts the predicted interference power calculated in the predicted interference power calculating section to the first radio communication system. - View Dependent Claims (2, 3, 4)
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5. A frequency band sharing method in which a first radio communication system and a second radio communication system share a shared frequency band which the first radio communication system uses in priority to the second radio communication system, comprising:
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broadcasting, in a radio station in the first radio communication system, load information of the first radio communication system to a transmitting station in the second radio communication system; estimating, in a transmitting station in the second radio communication system, based on load information acquired in an acquisition section of the transmitting station, an allowable interference level margin defined by a difference between an allowable interference level of a first radio communication system signal transmitted using the shared frequency band and a current interference level of the first radio communication system signal, determining, in the transmitting station in the second radio communication system, whether transmission of a second radio communication system signal from the transmitting station using the shared frequency band is possible or not, based on whether or not the estimated allowable interference level margin is a predetermined value or more; calculating, in the transmitting station in the second radio communication system, predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band; broadcasting, in the transmitting station in the second radio communication system, the calculated predicted interference power to the radio station in the first radio communication system; increasing, in the radio station in the first radio communication system, an allowable interference level of a first radio communication system signal transmitted using the shared frequency band, based on the broadcast predicted interference power; and increasing transmission power of the first radio communication system signal or decreasing a transmission rate of the first radio communication system signal in an allowable interference level control section, so that signal quality of the first radio communication system signal can be maintained even when a receiving station in the first radio communication system receives the predicted interference power by the second radio communication system signal.
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Specification