Patent ID: 8730883
Filing Date: 2014-05-20
Classification: H04B,H04W

Abstract:
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.