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
13 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, 9)
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10. 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. - View Dependent Claims (11, 12, 13)
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Specification