Base station, radio communications system, and processing method in base station
First Claim
1. A base station capable of simultaneously receiving an uplink signal from a terminal and transmitting a downlink signal to a terminal by using an identical frequency, the base station comprising:
- a transmitting unit that transmits, for each terminal, a downlink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal;
a receiving unit that receives, for each terminal, an uplink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal;
a determining unit that determines, for each terminal, whether reception quality of the uplink signal from the terminal, due to reflected waves of a downlink signal, is equal to or smaller than a certain threshold; and
a change unit that, when the determining unit determines that the reception quality is equal to or smaller than the certain threshold, instructs a first terminal that is a terminal of a transmission source of an uplink signal to change the frequency of the uplink signal of the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal, or changes the frequency of a downlink signal identical to the frequency of the uplink signal from the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal.
1 Assignment
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Accused Products
Abstract
A base station includes a determining unit, and a change unit. The determining unit determines, for each terminal, whether reception quality of an uplink signal from the terminal is equal to or smaller than a certain threshold. The change unit performs first processing or second processing when the reception quality is equal to or smaller than the certain threshold. The first processing is the processing of instructing a first terminal, a terminal of a transmission source of an uplink signal, to change the frequency of the uplink signal of the first terminal to the frequency of either an uplink or a downlink signal assigned to each terminal. The second processing is the processing of changing the frequency of a downlink signal identical to that of the uplink signal from the first terminal to the frequency of either an uplink or a downlink signal assigned to each terminal.
26 Citations
13 Claims
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1. A base station capable of simultaneously receiving an uplink signal from a terminal and transmitting a downlink signal to a terminal by using an identical frequency, the base station comprising:
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a transmitting unit that transmits, for each terminal, a downlink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; a receiving unit that receives, for each terminal, an uplink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; a determining unit that determines, for each terminal, whether reception quality of the uplink signal from the terminal, due to reflected waves of a downlink signal, is equal to or smaller than a certain threshold; and a change unit that, when the determining unit determines that the reception quality is equal to or smaller than the certain threshold, instructs a first terminal that is a terminal of a transmission source of an uplink signal to change the frequency of the uplink signal of the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal, or changes the frequency of a downlink signal identical to the frequency of the uplink signal from the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio communications system comprising:
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a plurality of terminals; and a base station capable of simultaneously receiving an uplink signal from each of the terminals and transmitting a downlink signal to each of the terminals by using an identical frequency, wherein the base station comprises; a transmitting unit that transmits, for each of the terminals, a downlink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; a receiving unit that receives, for each of the terminals, an uplink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; a determining unit that determines, for each of the terminals, whether reception quality of the uplink signal from the terminal, due to reflected waves of a downlink signal, is equal to or smaller than a certain threshold; and a change unit that, when the determining unit determines that the reception quality is equal to or smaller than the certain threshold, instructs a first terminal that is a terminal of a transmission source of an uplink signal to change the frequency of the uplink signal of the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each of the terminals, or changes the frequency of a downlink signal identical to the frequency of the uplink signal from the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each of the terminals.
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13. A processing method in a base station capable of simultaneously receiving an uplink signal from a terminal and transmitting a downlink signal to a terminal by using an identical frequency, the processing method comprising:
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transmitting, for each terminal, a downlink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; receiving, for each terminal, an uplink signal at a frequency assigned to the terminal via an antenna having directivity in a direction of the terminal; determining, for each terminal, whether reception quality of the uplink signal from the terminal, due to reflected waves of a downlink signal, is equal to or smaller than a certain threshold; and instructing a first terminal that is a terminal of a transmission source of an uplink signal to change the frequency of the uplink signal of the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal or changing the frequency of a downlink signal identical to the frequency of the uplink signal from the first terminal to either the frequency of an uplink signal or the frequency of a downlink signal assigned to each terminal when it is determined that the reception quality is equal to or smaller than the certain threshold.
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Specification