WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD
First Claim
1. A wireless communication system comprising:
- a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna elements; and
a plurality of second wireless stations each including a reception power measurement unit that measures a reception power,wherein the transmission directivity control unit of the first wireless station determines the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations,the transmission units generate wireless signals using the transmission directivity,the plurality of antenna elements transmit the generated wireless signals, andthe reception power measurement unit of the particular second wireless station measures the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detects the presence or absence of interference.
1 Assignment
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Accused Products
Abstract
Communication quality is prevented from being deteriorated due to interference caused by low accuracy of channel information or interference from another base station or another wireless communication system. A wireless communication system includes a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna elements, and a plurality of second wireless stations each including a reception power measurement unit that measures a reception power. The transmission directivity control unit determines the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations. The transmission units generate wireless signals using the transmission directivity. The plurality of antenna elements transmit the generated wireless signals. The reception power measurement unit measures the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detect the presence or absence of interference.
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Citations
16 Claims
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1. A wireless communication system comprising:
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a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna elements; and a plurality of second wireless stations each including a reception power measurement unit that measures a reception power, wherein the transmission directivity control unit of the first wireless station determines the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations, the transmission units generate wireless signals using the transmission directivity, the plurality of antenna elements transmit the generated wireless signals, and the reception power measurement unit of the particular second wireless station measures the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detects the presence or absence of interference. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communication method in which wireless communication is performed between a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna element, and a plurality of second wireless stations each including a reception power measurement unit that measures a reception power, the method comprising:
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a step of determining, using the transmission directivity control unit in the first wireless station, the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations; a step of generating, using the transmission units in the first wireless station, wireless signals using the determined transmission directivity, and transmitting the generated wireless signals from the plurality of antenna elements; and a step of measuring, using the reception power measurement unit in the particular second wireless station, the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detecting the presence or absence of interference.
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9. A wireless communication system in which a base station performs simultaneous communication of data with a plurality of terminals using the same frequency,
the base station comprising: -
a data selection/generation unit that generates the data; a null signal terminal determination unit that determines, when there is a terminal for which an interference power needs to be evaluated, the terminal as a null signal terminal; a first reception unit that receives a signal transmitted from the null signal terminal and acquires interference power information; a transmission method determination unit that determines a transmission weight, a modulation scheme, and a coding scheme based on channel information of a terminal that is a communication party and the interference power information acquired from the null signal terminal; a data selection/output unit that selects transmission data destined for the terminal that is the communication party from among data to be transmitted and outputs the transmission data; and a first transmission unit that transmits the transmission data using the determined modulation scheme, coding scheme, and transmission weight, and each of the terminals comprising; a second reception unit that receives the transmission data as a reception signal; a reception signal demodulation unit that performs detection, synchronization, and decoding of the reception signal; a null signal determination unit that determines that each of the terminals itself is the null signal terminal based on an output of the reception signal demodulation unit; an interference power evaluation unit that measures a reception power of a null signal portion and records the reception power as an interference power when each of the terminals itself is determined to be the null signal terminal; and a second transmission unit that modulates, codes, and transmits information on the interference power. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification