Patent ID: 8787279

Claim:
A radio communication system provided with a plurality of radio base stations, including a plurality of clusters of radio base stations, each cluster being a plurality of radio base stations that perform coordinated transmission with each other and forming a cell with a plurality of sectors, the radio communication system comprising: a cluster pattern determining section configured to determine an assignment of a cluster pattern to each cluster to suppress inter-cluster interference, each cluster pattern defining a directional pattern of angles of directional beams to be emitted from respective radio base stations within each cluster such that each radio base station within a respective cluster emits beams at a same directional pattern of angles for a given frequency block, and at least two neighboring clusters are assigned different cluster patterns at a same frequency such that a first cluster of the neighboring clusters is assigned a first cluster pattern in which each radio base station emits directional beams at a first directional pattern of angles for a certain frequency, and a second cluster of the neighboring clusters is assigned a second cluster pattern in which each radio base station emits directional beams at a second directional pattern of angles, which is different than the first directional pattern of angles, at the certain frequency; and a directional pattern determining section configured to assign directional patterns of angles of directional beams to the plurality of clusters for each frequency block based on the cluster pattern determined by the cluster pattern determining section, wherein: the plurality of radio base stations form directional beams according to the directional pattern of angles of directional beams in the same time slot and coordinate data transmission between sectors through multiuser multiple-input multiple-output (MIMO) transmission between directional beams of one radio base station and another radio base station having sectors adjacent to each other in a cluster and facing each other at the same frequency block.