WIRELESS COMMUNICATIONS APPARATUS, WIRELESS COMMUNICATIONS METHOD, PROGRAM, AND INTEGRATED CIRCUIT
First Claim
1. A wireless communications apparatus which performs wireless communications with an external apparatus, said wireless communications apparatus comprising:
- an antenna having a directivity that is changeable;
a storage unit configured to store a plurality of directional patterns and a plurality of thresholds, the directional patterns each indicating the directivity of said antenna, and the thresholds each being an expected value of a throughput obtained according to a first radio propagation environment parameter indicating a state of a radio propagation environment; and
a controller which changes the directivity of said antenna based on a directional pattern selected from the directional patterns,wherein said controller includes;
a threshold identifying unit configured to measure the first radio propagation environment parameter by using one of the directional patterns, and identify, from among the thresholds stored in said storage unit, a threshold corresponding to the measured first radio propagation environment parameter;
a directional pattern selecting unit configured to;
perform test communications by sequentially switching the directional patterns;
measure a second radio propagation environment parameter for each of the directional patterns used for the test communications, the second radio propagation environment parameter being different from the first radio propagation environment parameter; and
select, from among the directional patterns, a directional pattern having an actual throughput that is greater than the threshold, the actual throughput being calculated from a measurement value of the second radio propagation environment parameter; and
a threshold adjusting unit configured to change the threshold identified by said threshold identifying unit, according to the number of test communications that is the number of the directional patterns used for the test communications performed by said directional pattern selecting unit.
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Accused Products
Abstract
A wireless communications apparatus (100) includes: antennas (111, 112, and 113); a threshold identifying unit (141) which measures a first radio propagation environment parameter by using a specific directional pattern, and identifies a threshold, from among thresholds, which corresponds to the measured first radio propagation environment parameter; a directional pattern selecting unit (142) which performs test communications by sequentially switching directional patterns, and selects a directional pattern having an actual throughput, calculated from a measurement value of a second radio propagation environment parameter, greater than the threshold; and a threshold adjusting unit (143) which changes the threshold identified by the threshold identifying unit (141), according to the number of test communications that is the number of the directional patterns used for the test communications performed by the directional pattern selecting unit (142).
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Citations
15 Claims
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1. A wireless communications apparatus which performs wireless communications with an external apparatus, said wireless communications apparatus comprising:
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an antenna having a directivity that is changeable; a storage unit configured to store a plurality of directional patterns and a plurality of thresholds, the directional patterns each indicating the directivity of said antenna, and the thresholds each being an expected value of a throughput obtained according to a first radio propagation environment parameter indicating a state of a radio propagation environment; and a controller which changes the directivity of said antenna based on a directional pattern selected from the directional patterns, wherein said controller includes; a threshold identifying unit configured to measure the first radio propagation environment parameter by using one of the directional patterns, and identify, from among the thresholds stored in said storage unit, a threshold corresponding to the measured first radio propagation environment parameter; a directional pattern selecting unit configured to; perform test communications by sequentially switching the directional patterns; measure a second radio propagation environment parameter for each of the directional patterns used for the test communications, the second radio propagation environment parameter being different from the first radio propagation environment parameter; and select, from among the directional patterns, a directional pattern having an actual throughput that is greater than the threshold, the actual throughput being calculated from a measurement value of the second radio propagation environment parameter; and a threshold adjusting unit configured to change the threshold identified by said threshold identifying unit, according to the number of test communications that is the number of the directional patterns used for the test communications performed by said directional pattern selecting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of performing wireless communications with an external apparatus, said method being performed by a wireless communications apparatus which includes an antenna and a storage unit, the antenna having a directivity that is changeable, the storage unit storing a plurality of directional patterns and a plurality of thresholds, the directional patterns each indicating the directivity of the antenna, the thresholds each being an expected value of a throughput obtained according to a first radio propagation environment parameter indicating a state of a radio propagation environment,
said method comprising: -
measuring the first radio propagation environment parameter by using one of the directional patterns, and identifying, from among the thresholds stored in said storage unit, a threshold corresponding to the measured first radio propagation environment parameter; (i) performing test communications by sequentially switching the directional patterns, (ii) measuring a second radio propagation environment parameter for each of the directional patterns used for the test communications, the second radio propagation environment parameter being different from the first radio propagation environment parameter, (iii) selecting, from among the directional patterns, a directional pattern having an actual throughput that is greater than the threshold, the actual throughput being calculated from a measurement value of the second radio propagation environment parameter, and (iv) causing the antenna to perform the wireless communications with the selected directional pattern; and changing the threshold identified in said identifying, according to the number of test communications that is the number of the directional patterns used for the test communications performed in said performing.
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14. A non-transitory computer-readable recording medium for use in a computer and having a computer program recorded thereon, the computer including an antenna and a storage unit, the antenna having a directivity that is changeable, the storage unit storing a plurality of directional patterns and a plurality of thresholds, the directional patterns each indicating the directivity of the antenna, and the thresholds each being an expected value of a throughput obtained according to a first radio propagation environment parameter indicating a state of a radio propagation environment, the computer program causing the computer to perform wireless communications with an external apparatus and causing the computer to execute:
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measuring the first radio propagation environment parameter by using one of the directional patterns, and identifying, from among the thresholds stored in said storage unit, a threshold corresponding to the measured first radio propagation environment parameter; (i) performing test communications by sequentially switching the directional patterns, (ii) measuring a second radio propagation environment parameter for each of the directional patterns used for the test communications, the second radio propagation environment parameter being different from the first radio propagation environment parameter, (iii) selecting, from among the directional patterns, a directional pattern having an actual throughput that is greater than the threshold, the actual throughput being calculated from a measurement value of the second radio propagation environment parameter, and (iv) causing the antenna to perform the wireless communications with the selected directional pattern; and changing the threshold identified in said identifying, according to the number of test communications that is the number of the directional patterns used for the test communications performed in said performing.
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15. An integrated circuit which causes a wireless communications apparatus to perform wireless communications with an external apparatus, the wireless communications apparatus including an antenna and a storage unit, the antenna having a directivity that is changeable, the storage unit storing a plurality of directional patterns and a plurality of thresholds, the directional patterns each indicating the directivity of the antenna, and the thresholds each being an expected value of a throughput obtained according to a first radio propagation environment parameter indicating a state of a radio propagation environment, said integrated circuit comprising:
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a threshold identifying unit configured to measure the first radio propagation environment parameter by using one of the directional patterns, and identify, from among the thresholds stored in said storage unit, a threshold corresponding to the measured first radio propagation environment parameter; a directional pattern selecting unit configured to; perform test communications by sequentially switching the directional patterns; measure a second radio propagation environment parameter for each of the directional patterns used for the test communications, the second radio propagation environment parameter being different from the first radio propagation environment parameter; and select, from among the directional patterns, a directional pattern having an actual throughput that is greater than the threshold, the actual throughput being calculated from a measurement value of the second radio propagation environment parameter; and a threshold adjusting unit configured to change the threshold identified by the threshold identifying unit, according to the number of test communications that is the number of the directional patterns used for the test communication performed by the directional pattern selecting unit.
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Specification