Abstract: A base station apparatus capable of transmitting a downlink transmission frame at transmission timing different from another base station apparatus is provided. The base station apparatus includes a blank resource setting section that sets, as a blank resource, a resource corresponding to a downlink control channel included in a downlink transmission frame transmitted from the other base station apparatus, a user data assigning section that assigns user data to the downlink transmission frame while avoiding the blank resource, and a transmission section that transmits the downlink transmission frame assigned the user data to a mobile terminal apparatus.

Abstract: To provide a base station apparatus, mobile terminal apparatus and communication control method for enabling control adapted to interference inside a Heterogeneous network to be performed to support the next-generation mobile communication system, a base station apparatus (20) shares at least a part of the frequency band with another base station apparatus (40) that covers a macro-cell, covers a pico-cell (C1), is capable of transmitting a downlink transmission frame at transmission timing different from the another base station apparatus (40), and is configured to set resources, in which the downlink transmission frame undergoes interference from another downlink transmission frame including a blank period transmitted from the another base station apparatus (40), as blank resources, and assign user data to the downlink transmission frame while avoiding the blank resources.

Abstract: To provide a base station apparatus, mobile terminal apparatus and communication control method for enabling control adapted to interference inside a Heterogeneous network to be performed to support the next-generation mobile communication system, a base station apparatus (20) shares at least a part of the frequency band with another base station apparatus (40) that covers a macro-cell, covers a pico-cell (C1), is capable of transmitting a downlink transmission frame at transmission timing different from the another base station apparatus (40), and is configured to set resources, in which the downlink transmission frame undergoes interference from another downlink transmission frame including a blank period transmitted from the another base station apparatus (40), as blank resources, and assign user data to the downlink transmission frame while avoiding the blank resources.

Abstract: To provide a radio base station apparatus, a radio relay station apparatus and a resource allocation method each which perform resource division of a backhaul sub-frame more optimally and can improve a throughput of a system, in the case of relay transmission. The radio base station apparatus according to the present invention includes: a frequency bandwidth control section configured to control a frequency bandwidth in a backhaul sub-frame, based on the number of the backhaul sub-frames, the number of mobile terminal devices, and frequency utilization efficiency of a radio link; and a transmitting section configured to transmit the backhaul sub-frame with the frequency bandwidth controlled by the frequency bandwidth control section.

Abstract: To partially suppress interference to control channels of a pico-cell from a base station apparatus of a macro-cell and enable assignment of user data to a subframe besides the same subframe using a part of control channels with interference suppressed thereto, a base station apparatus disposed in a second system having a system band comprised of a plurality of component carriers for sharing at least a part of a frequency band with a first system having a macro-cell (C2) and covering a pico-cell (C1) is configured to generate a carrier indicator for indicating another component carrier to which user data is assigned besides the same component carrier on a control channel of the component carrier, while indicating another subframe to which user data is assigned besides the same subframe on the downlink control channel.

Abstract: A mobile terminal selects a radio base station that is the access point for the mobile terminal in accordance with received-radiowave characteristic values for respective radio base stations. The multiple radio base stations include a macrobase station and multiple picobase stations. Each picobase station includes a load measurement unit adapted for measuring or calculating the communication load index of the picobase station itself; an adjustment-value setting unit adapted for setting an adjustment value that is used by the mobile terminal to change the received-radiowave characteristic value of the picobase station itself, depending on the communication load index; and an adjustment-value signaling unit adapted for signaling the adjustment value set by the adjustment-value setting unit to the mobile terminal.

Abstract: A base station apparatus, a mobile terminal apparatus and a communication control method are provided which can perform control adaptable to interference in a heterogeneous network and support next-generation mobile communication systems.

Abstract: To provide a cell selecting method in which an optimal cell can be selected in the case of relay transmission. The cell selecting method includes: in a radio base station apparatus, determining a specified sub-frame including data for measuring reception quality in a mobile terminal device; and in a mobile terminal device, measuring first reception quality using a reference signal of the specified sub-frame transmitted from the radio base station apparatus and second reception quality using a reference signal of the specified sub-frame transmitted from the radio base station apparatus through a radio relay station apparatus, and transmitting the first reception quality and the second reception quality to the radio base station apparatus; and in the radio base station apparatus, selecting a cell to which the mobile terminal device is connected using the first reception quality and the second reception quality, and transmitting information on the selected cell to the mobile terminal device.

Abstract: To provide a base station apparatus, mobile terminal apparatus and communication control method for enabling control adapted to interference inside a Heterogeneous network to be performed to support the next-generation mobile communication system, a base station apparatus (20) shares at least a part of the frequency band with another base station apparatus (40) that covers a macro-cell, covers a pico-cell (C1), is capable of transmitting a downlink transmission frame at transmission timing different from the another base station apparatus (40), and is configured to set resources, in which the downlink transmission frame undergoes interference from another downlink transmission frame including a blank period transmitted from the another base station apparatus (40), as blank resources, and assign user data to the downlink transmission frame while avoiding the blank resources.

Abstract: To partially suppress interference to control channels of a pico-cell from a base station apparatus of a macro-cell and enable assignment of user data to a subframe besides the same subframe using a part of control channels with interference suppressed thereto, a base station apparatus disposed in a second system having a system band comprised of a plurality of component carriers for sharing at least a part of a frequency band with a first system having a macro-cell (C2) and covering a pico-cell (C1) is configured to generate a carrier indicator for indicating another component carrier to which user data is assigned besides the same component carrier on a control channel of the component carrier, while indicating another subframe to which user data is assigned besides the same subframe on the downlink control channel.

Abstract: A multicarrier radio communication system includes a first mobile station located at a position where it is possible to directly communicate with the base station and to communicate with a radio relay station, and a second mobile station located at a position where it is impossible to directly communicate with the base station and it is possible to communicate with the radio relay station. For allocating subcarriers to signals, the base station determines an order of priority for signals destined for mobile stations on the basis of whether each mobile station is the first mobile station or not. The radio relay station allocates subcarriers to the signals, independently of subcarrier allocation made at the base station. For allocating subcarriers, the radio relay station determines an order of priority for signals on the basis of whether each mobile station is the first mobile station or not.