Radio communication device and radio communication method
First Claim
1. A radio communication device that includes a radio communication unit transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising:
- an antenna selector configured to perform antenna selection processing when a communication quality degrades below a predetermined threshold in a radio communication channel between the radio communication device and the receiving device receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series, the antenna selection processing performed by selecting, from among the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the communication quality degrades below the predetermined threshold, whereinthe radio communication unit transmits the communication data series through the transmitting antennas selected by the antenna selector,the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band,among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, andthe antenna selector selects the short distance antenna group when the communication quality degrades below the predetermined threshold.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio base station (100) is provided with a stream determination unit (141) for determining whether communication quality of a radio communication channel between the radio base station (100) and a receiving device is lower than a predetermined threshold, and an antenna selector (142) for selecting, from among transmitting antennas (131-134), transmitting antennas such that the distance between the transmitting antennas (131-134) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.
14 Citations
11 Claims
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1. A radio communication device that includes a radio communication unit transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising:
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an antenna selector configured to perform antenna selection processing when a communication quality degrades below a predetermined threshold in a radio communication channel between the radio communication device and the receiving device receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series, the antenna selection processing performed by selecting, from among the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the communication quality degrades below the predetermined threshold, wherein the radio communication unit transmits the communication data series through the transmitting antennas selected by the antenna selector, the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band, among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, and the antenna selector selects the short distance antenna group when the communication quality degrades below the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio communication device that includes a radio communication unit capable of transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising:
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an antenna selector configured to perform antenna selection processing when the number of communication data series transmitted from the radio communication unit to the receiving device decreases to a predetermined number or below, the antenna selection processing performed by selecting, from the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the number of communication data series decreases to the predetermined number or below, the receiving device being capable of receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series, wherein the radio communication unit transmits the communication data series through the transmitting antennas selected by the antenna selector, the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band, among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, and the antenna selector selects the short distance antenna group when the communication quality degrades below the predetermined threshold.
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10. A radio communication method that uses a radio communication unit transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising the steps of:
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when a communication quality degrades below a predetermined threshold in a radio communication channel between the radio communication unit and the receiving device receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series, selecting, from among the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the communication quality degrades below the predetermined threshold; and transmitting, from the radio communication unit, the communication data series through the transmitting antennas selected by the step of selecting, wherein the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band, among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, and selecting, by the antenna selector, the short distance antenna group when the communication quality degrades below the predetermined threshold.
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11. A radio communication method that uses a radio communication unit capable of transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising the steps of:
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when the number of communication data series transmitted from the radio communication unit to the receiving device decreases to a predetermined number or below, selecting, from among the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the number of communication data series decreases to the predetermined number or below, the receiving device being capable of receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series; and transmitting, from the radio communication unit, the communication data series through the transmitting antennas selected by the step of selecting, wherein the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band, among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, and selecting, by the antenna selector, the short distance antenna group when the communication quality degrades below the predetermined threshold.
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Specification