Radio base station apparatus, user terminal and radio communication method

摘要

To effectively improve the reception quality in a pico-base station, while preventing throughput of a macro-base station from significantly deteriorating, a macro-base station (M-BS) is provided with a beam generating section (35) that generates a directional beam to a macro-UE using antenna weights based on a beampattern assigned to the macro-UE existing in a macro-cell having a first coverage area, and a coordination section (36) that determines a beam pattern so that a beam pattern to the macro-UE existing in the macro-cell is a beam pattern that suppresses interference power to a pico-UE existing in a pico-cell, in assigning the beam pattern to the macro-UE existing in the macro-cell during a transmission period assigned to a pico-base station (P-BS) locally forming the pico-cell in the macro-cell.

主权项

1. A radio base station apparatus comprising:
a beam generating section configured to generate a directional beam to a user terminal using antenna weights based on a beam pattern assigned to the user terminal existing in a first cell having a first coverage area; and a coordination section configured to determine a beam pattern so that a beam pattern to the user terminal existing in the first cell is a beam pattern that suppresses interference power to a user terminal existing in a second cell, in assigning the beam pattern to the user terminal existing in the first cell during a transmission period assigned to a micro-base station locally forming the second cell having a second coverage area smaller than the first coverage area in the first cell, wherein the coordination section receives a second cell beam pattern suitable for the user terminal existing in the second cell that the micro-base station accommodates from the micro-base station, and determines the beam pattern that suppresses interference power to the user terminal existing in the second cell by referring to the second cell beam pattern, during the transmission period assigned to the micro-base station forming the second cell.