Cognitive radio communication system using multiple input multiple output communication scheme
First Claim
Patent Images
1. A cognitive radio base station comprising:
- a plurality of antennas;
a setting unit configured to set a secondary terminal, from among a plurality of secondary terminals within a cell coverage of the cognitive radio base station, as a sensing terminal; and
a signal generator configured to generate a transmission signal and to transmit the transmission signal using channels formed between the plurality of antennas and the plurality of secondary terminals, the transmission signal providing a sensing time for the sensing terminal to sense a signal of a primary user and simultaneously providing data to at least one other secondary terminal while the sensing terminal and the at least one other secondary terminal are within the cell coverage, whereinthe signal generator generates the transmission signal so that a signal received by the sensing terminal is null or near-null.
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Abstract
A cognitive radio communication system using a multiple input multiple output (MIMO) communication technology is provided. A cognitive radio base station includes a plurality of antennas, a group setting unit to set at least one sensing terminal group that includes at least one sensing terminal among a plurality of terminals, and a signal generator to generate a transmission signal to transmit the transmission signal using channels formed between the plurality antennas and the plurality of terminals, so that the at least one sensing terminal is accorded a sensing time.
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Citations
27 Claims
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1. A cognitive radio base station comprising:
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a plurality of antennas; a setting unit configured to set a secondary terminal, from among a plurality of secondary terminals within a cell coverage of the cognitive radio base station, as a sensing terminal; and a signal generator configured to generate a transmission signal and to transmit the transmission signal using channels formed between the plurality of antennas and the plurality of secondary terminals, the transmission signal providing a sensing time for the sensing terminal to sense a signal of a primary user and simultaneously providing data to at least one other secondary terminal while the sensing terminal and the at least one other secondary terminal are within the cell coverage, wherein the signal generator generates the transmission signal so that a signal received by the sensing terminal is null or near-null. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cognitive radio base station comprising:
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a setting unit configured to set a secondary terminal, from among a plurality of secondary terminals within a cell coverage of the cognitive radio base station, as a sensing terminal; and an uplink communication terminal decision unit configured to determine at least one uplink communication terminal to perform an uplink communication from among the plurality of secondary terminals, so that the sensing terminal is simultaneously accorded a sensing time to sense for a primary user during the uplink communication while the sensing terminal and the uplink connection terminal are within the cell coverage, wherein the cognitive radio base station generates a transmission signal so that a signal received by the sensing terminal is null or near-null. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of a sensing terminal from among a plurality of secondary terminals within a cell of a cognitive radio base station, the method comprising:
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recognizing by the sensing terminal the existence of a primary user according to a fast sensing scheme and reporting to the cognitive radio base station information associated with the existence of the primary user; and sensing by the sensing terminal a signal of the primary user while receiving a transmission signal from the cognitive radio base station, wherein; the transmission signal is transmitted by the cognitive radio base station via a plurality of antennas, and the transmission signal provides a sensing time for the sensing terminal to sense a signal of the primary user and simultaneously provides data to at least one other secondary terminal while the sensing terminal and the at least one other secondary terminal are within the cell coverage, and the transmission signal is generated so that a signal received by the sensing terminal is null or near-null. - View Dependent Claims (19, 20, 21)
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22. A method of a cognitive radio base station, the method comprising:
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setting by the cognitive radio base station a secondary terminal, from among a plurality of secondary terminals within a cell coverage of the cognitive radio base station, as a sensing terminal; generating by the cognitive radio base station a transmission signal to be transmitted between a plurality of antennas and the plurality of secondary terminals, the transmission signal providing a sensing time during the transmission of the transmission signal to the sensing terminal to sense a primary user on the frequency band while simultaneously provides data to at least one other secondary terminal within the cell coverage; and transmitting by the cognitive radio base station the transmission signal to the plurality of secondary terminals via the plurality of antennas while the sensing terminal and the at least one other secondary terminal are within the cell coverage, wherein the cognitive radio base station generates the transmission signal so that a signal received by the sensing terminal is null or near-null. - View Dependent Claims (23, 24)
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25. A method of a cognitive radio base station, the method comprising:
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setting by the cognitive radio base station a secondary terminal, from among a plurality of secondary terminals within a cell coverage of the cognitive radio base station, as a sensing terminal; and determining by the cognitive radio base station at least one uplink communication terminal configured to perform an uplink communication from among the plurality of secondary terminals, so that the sensing terminal is simultaneously accorded a sensing time to sense for a primary user during the uplink communication while the sensing terminal and the uplink connection terminal are within the cell coverage, wherein the cognitive radio base station generates a transmission signal so that a signal received by the sensing terminal is null or near-null. - View Dependent Claims (26)
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27. A non-transitory computer-readable storage medium storing a program to operate a sensing terminal from among a plurality of secondary terminals within a cell coverage of a cognitive radio base station, comprising instructions to cause the sensing terminal to:
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recognize the existence of a primary user according to a fast sensing scheme and reporting to the cognitive radio base station information associated with the existence of the primary user; and sense a signal of the primary user while receiving a transmission signal from the cognitive radio base station, wherein; the cognitive radio base station transmits the transmission signal via a plurality of antennas, and the transmission signal provides a sensing time for the sensing terminal to sense a signal of the primary user and simultaneously provides data to at least one other secondary terminal while the sensing terminal and the at least one other secondary terminal are within the cell coverage, and the cognitive radio base station generates the transmission signal so that a signal received by the sensing terminal is null or near-null.
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Specification