Coordinated transmission method, coordinated transmission system, central station and radio base station
First Claim
1. A coordinated transmission method in which a plurality of radio base stations simultaneously transmit signals to a radio terminal locating in a first coordinated cluster formed by adjacent sectors of the plurality of radio base stations, comprising:
- selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that the plurality of radio base stations transmit first directional beams of a first frequency domain resource toward a center of the first coordinated cluster while not transmitting the first directional beams toward a second coordinated cluster adjacent to the first coordinated cluster, and the second directional pattern is configured so that the plurality of radio base stations transmit second directional beams of a second frequency domain resource toward a center of the second coordinated cluster while not transmitting the second directional beams toward the first coordinated cluster; and
distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal.
1 Assignment
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Accused Products
Abstract
A coordinated transmission method of the invention has the steps of selecting a directional pattern corresponding to an area in which a radio terminal locates, from among a plurality of directional patterns determined respectively corresponding to a plurality of resources in frequency domains where the plurality of directional patterns is configured so that a plurality of radio base stations surrounding the area transmits, to the area, directional beams of same frequency domain resources to face one another, while not transmitting the directional beams of the same frequency domain resources using the same frequency domain resources to areas adjacent to the area, and of distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal.
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Citations
13 Claims
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1. A coordinated transmission method in which a plurality of radio base stations simultaneously transmit signals to a radio terminal locating in a first coordinated cluster formed by adjacent sectors of the plurality of radio base stations, comprising:
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selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that the plurality of radio base stations transmit first directional beams of a first frequency domain resource toward a center of the first coordinated cluster while not transmitting the first directional beams toward a second coordinated cluster adjacent to the first coordinated cluster, and the second directional pattern is configured so that the plurality of radio base stations transmit second directional beams of a second frequency domain resource toward a center of the second coordinated cluster while not transmitting the second directional beams toward the first coordinated cluster; and distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal. - View Dependent Claims (2, 3, 4, 5)
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6. A coordinated transmission system in which a plurality of radio base stations simultaneously transmit signals to a radio terminal locating in a first coordinated cluster formed by adjacent sectors of the plurality of radio base stations, comprising:
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a selection section for selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that the plurality of radio base stations transmit first directional beams of a first frequency domain resource toward a center of the first coordinated cluster while not transmitting the first directional beams toward a second coordinated cluster adjacent to the first coordinated cluster, and the second directional pattern is configured so that the plurality of radio base stations transmit second directional beams of a second frequency domain resource toward a center of the second coordinated cluster while not transmitting the second directional beams toward the first coordinated cluster; and a delivery section for distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal.
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7. A central station connected to a plurality of radio base stations in a coordinated transmission system in which the plurality of radio base stations simultaneously transmit signals to a radio terminal locating in a first coordinated cluster formed by adjacent sectors of the plurality of radio base stations, comprising:
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a selection section for selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that the plurality of radio base stations transmit first directional beams of a first frequency domain resource toward a center of the first coordinated cluster while not transmitting the first directional beams toward a second coordinated cluster adjacent to the first coordinated cluster, and the second directional pattern is configured so that the plurality of radio base stations transmit second directional beams of a second frequency domain resource toward a center of the second coordinated cluster while not transmitting the second directional beams toward the first coordinated cluster; and a delivery section for distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain of and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A radio base station in a coordinated transmission system in which a plurality of radio base stations simultaneously transmit signals to a radio terminal locating in a first coordinated cluster formed by adjacent sectors of the plurality of radio base stations, comprising:
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a selection section for selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that for selecting a first directional pattern or a second directional pattern, wherein the first directional pattern is configured so that the plurality of radio base stations transmit first directional beams of a first frequency domain resource toward a center of the first coordinated cluster while not transmitting the first directional beams toward a second coordinated cluster adjacent to the first coordinated cluster, and the second directional pattern is configured so that the plurality of radio base stations transmit second directional beams of a second frequency domain resource toward a center of the second coordinated cluster while not transmitting the second directional beams toward the first coordinated cluster; and a delivery section for distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal.
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Specification