Radio system
First Claim
1. A radio system that divides a certain region into two or more cells and installs a base station at about the center of each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein each base station is divided into two or more sectors, each of which is provided with an antenna different in directivity on a horizontal plane, the antennas are so placed that the antenna beams cover all the directions on the horizontal plane as a whole, and all the antennas using the same frequency and the same polarized wave are so arranged to face in about the same direction.
1 Assignment
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Accused Products
Abstract
The present invention is to provide a radio system that enables effective reuse of a limited number of frequencies without the occurrence of interference between subscriber stations. In the radio system according to the present invention, each base station is divided into two or more sectors, each of which is provided with an antenna different in directivity on a horizontal plane. The antennas are so placed that the antenna beams cover all the directions on the horizontal plane as a whole, and all the antennas using the same frequency and polarized wave are so arranged to face in about the same direction.
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Citations
11 Claims
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1. A radio system that divides a certain region into two or more cells and installs a base station at about the center of each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein
each base station is divided into two or more sectors, each of which is provided with an antenna different in directivity on a horizontal plane, the antennas are so placed that the antenna beams cover all the directions on the horizontal plane as a whole, and all the antennas using the same frequency and the same polarized wave are so arranged to face in about the same direction.
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2. A radio system that divides a certain region into two or more cells and installs a base station at about the center of each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein
each base station is divided into two or more sectors, each of which is provided with an antenna different in directivity on a horizontal plane, the antennas are so placed that the antenna beams cover all the directions on the horizontal plane as a whole, and two or more antennas using the same frequency and the same polarized wave are brought together as an antenna group to arrange all the antenna groups using the same frequency and the same polarized wave to face in about the same direction.
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7. A radio communication system that divides a certain region into two or more cells and installs a base station in each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein
the base station is installed near the edge of the cell, and all the antennas at the base station are made possible communication throughout the same range of the horizontal direction and placed to face in the same direction.
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8. A radio communication system that divides a certain region into two or more cells and installs a base station in each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein
the base station is installed near the edge of the cell, and all the antennas at the base station are made possible communication throughout the same range of the horizontal direction and placed not to face the other stations.
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10. A radio communication system that divides a certain region into two or more cells and installs a base station in each cell to carry out communication between the base station and many fixed terminal stations in the cell in which the base station is installed, wherein
the base station is installed near the edge of the cell, and each cell is divided into two or more sectors, each of which is provided with an antenna, all the antennas at the base station made possible communication throughout the same range of the horizontal direction, and placed not to face the other base stations.
Specification