Wireless communication method and system using beam direction-variable antenna
First Claim
1. A wireless communication method for base stations each having a plurality of antenna elements to communicate with wireless terminals, comprising the steps of:
- receiving signals from said wireless terminals via said antenna elements from which the received signals can be synthesized and to which the transmission signals can be synthesized to form an antenna directivity of certain beam patterns;
synthesizing said signals received from said antenna elements to form said antenna directivity of said certain beam pattern;
selecting one of said received signals from said wireless terminals on the basis of said synthesized received signals of different directivities and determining transmission beam direction information for use in directing the beam in the direction of said selected signal;
estimating a transmission beam slot on the basis of said determined beam direction information, and a table of the relations of transmission beam directions and time slots on which said radio beams are radiated in those directions; and
transmitting a down-link signal on said estimated transmission beam time slot from said antenna elements controlled.
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Accused Products
Abstract
In a time-division multiplexing wireless communication system, an antenna module has plural antenna elements. Receiver high-frequency circuit synthesizes signals from the antenna elements according to an antenna directivity having a desired beam pattern. Demodulator selects one of the received signals from wireless terminals according to the synthesized received signals, and determines transmission beam direction information for use in directing the beam in the selected direction. Weighting circuit generates weight coefficients for setting of the beam patterns and transmission beam directions according to the transmission beam direction information, and produces transmission time slots according to a table listing the relations of the transmission beam directions and the time slots for use in the beam radiation in those directions. Down-link fixed beam-forming circuit and modulator control the antenna module using the generated beam pattern, beam direction and transmission time slots to transmit the down-link signal.
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Citations
19 Claims
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1. A wireless communication method for base stations each having a plurality of antenna elements to communicate with wireless terminals, comprising the steps of:
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receiving signals from said wireless terminals via said antenna elements from which the received signals can be synthesized and to which the transmission signals can be synthesized to form an antenna directivity of certain beam patterns;
synthesizing said signals received from said antenna elements to form said antenna directivity of said certain beam pattern;
selecting one of said received signals from said wireless terminals on the basis of said synthesized received signals of different directivities and determining transmission beam direction information for use in directing the beam in the direction of said selected signal;
estimating a transmission beam slot on the basis of said determined beam direction information, and a table of the relations of transmission beam directions and time slots on which said radio beams are radiated in those directions; and
transmitting a down-link signal on said estimated transmission beam time slot from said antenna elements controlled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. A wireless communication method for base stations to communicate with wireless terminals, comprising the steps of:
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disposing a plurality of said base stations at the vertices of each square;
controlling beam patterns of antennas of said base stations, which antennas each have a plurality of antenna-elements from which the received signals are synthesized and to which the transmission signals are synthesized to form an antenna directivity of a certain beam pattern, so that said beam patterns of one of adjacent ones of said base stations are shifted in beam direction by 45 degrees or about 45 degrees from those of the other;
receiving signals from said wireless terminals via said antennas;
synthesizing said signals from said antenna elements according to said antenna directivity of said certain beam pattern;
receiving a desired signal from said wireless terminals on the basis of said synthesized received signals of different directivities; and
transmitting a down-link signal from said antenna of which the directivity is controlled to have said predetermined beam pattern.
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10. A wireless communication method for base stations to communicate with wireless terminals, comprising the steps of:
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disposing a plurality of said base terminals at the vertices of each triangle;
synthesizing received signals from and transmitted signals to a plurality of antenna elements that constitute an antenna of each of said base stations to form an antenna directivity having a certain beam pattern; and
controlling said beam patterns of said base stations to direct in the same direction dynamically or statically.
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11. A wireless communication method for base stations to communicate with wireless terminals, comprising the steps of:
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disposing a plurality of said base stations at the vertices of each square;
synthesizing received signals from and transmitted signals to a plurality of antenna elements that constitute an antenna of each of said base stations to form an antenna directivity having a certain beam pattern; and
controlling said beam patterns of said antennas of said base stations so that said beam patterns of one of adjacent ones of said base stations are shifted in beam direction by 45 degrees or about 45 degrees from those of the other. - View Dependent Claims (17, 18, 19)
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12. A wireless communication method comprising the steps of:
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disposing a plurality of base stations at the vertices of each triangle on a plane;
constructing an antenna of each base station by three sector antennas; and
synthesizing received signals from and transmitted signals to said antenna elements.
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13. A wireless communication method comprising the steps of:
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disposing a plurality of base stations at the vertices of each square on a plane;
constructing an antenna of each base station by four sector antennas; and
synthesizing received signals from and transmitted signals to said antenna elements;
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14. A wireless communication method comprising the steps of:
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disposing a plurality of base stations in a square cell shape;
constructing the antenna of each base station by 8 directional antennas; and
specifying the directivity of each antenna for each time slot so that two ones of three directional beams are perpendicular to each other and the other one is radiated at an angle of 135 degrees relative to said two beams.
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16. A wireless communication system for a plurality of base stations to communicate with wireless terminals, each base station comprising:
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an antenna having a plurality of antenna elements, the received signals from which, and the transmitted signals to which are respectively synthesized to form an antenna directivity having certain beam patterns;
a circuit for receiving signals from said wireless terminals via said antenna;
a circuit for synthesizing said signals from said antenna elements according to said antenna directivity of said certain beam pattern;
a circuit for selecting one of said received signals from said wireless terminals on the basis of said synthesized received signals of different directivities, and determining transmission beam direction information for use in directing the beam in said selected direction;
a circuit for generating transmission time slots on the basis of said transmission beam direction information from said decision circuit and an information table that shows the relations of transmission beam directions and beam time slots for use in radiating beams in those directions; and
a circuit for transmitting a down-link signal on said generated transmission beam time slot from said antenna controlled.
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Specification