Abstract: When the received power level of the low-power PDCCH control information from a low-power base station (200) received by a radio terminal (300) is at a prescribed level or more, a high-power base station (100) removes the high-power base station (100) as the connection destination candidate of the radio terminal (300) regardless of the received power level of the high-power PDCCH control information from the high-power base station (100), and performs handover processing so that the connection destination of the radio terminal (300) switches from the high-power base station (100) to the low-power base station (200) which has become the connection destination candidate.

Abstract: A radio base station (1A) generates and holds associations each between a resource block and a piece of MIMO information and allocates, based on the associations, a resource block to radio terminals (2A and 2C) in the cell (3A). When the radio terminals (2A and 2C) in the cell (3A) suffers a predetermined level or higher level of interference caused by the communication between another radio base station (1B) and a radio terminal (2B) that exists in the cell (3B) of the other radio base station (1B), the radio base station (1A) selects one of the associations each between a resource block and a piece of MIMO information and allocates, based on the selected association, a resource block to the radio terminals (2A and 2C) in the cell (3A).

Abstract: Even when being located at cell edge in a multiband mobile communication system, a radio communication terminal, is allowed to stably execute cell search so as to easily establish a connection with a radio base station. The radio communication terminal according to the present invention includes: a first determination unit 13 configured to determine whether or not a broadcast map can be received from a plurality of radio base stations; a second determination unit 14 configured to determine whether or not an AAS diversity map can be received from the radio base stations in ascending order of used frequency bands, when it is determined that the broadcast map cannot be received; and a communication controller 15 configured to select a radio base station, which is determined to be a radio base station from which the AAS diversity map can be received, as a connection destination radio base station, and to communicate with the selected radio base station.

Abstract: The disclosed radio base station (1A) generates and retains associations between resource blocks and MIMO information, and allocates resource blocks to radio terminals (2A, 2C) within a cell (3A) on the basis of said associations. When the interference received by the radio terminals (2A, 2C) within the cell (3A) is greater than or equal to a specified level, said interference being due to the communication between another radio base station (1B) and a radio terminal (2B) within the cell (3B) associated with said other radio base station (1B), the radio base station (1A) selects any one of the associations between the resource blocks and the MIMO information and, on the basis of said associations, allocates resource blocks to the radio terminals (2A, 2C) within the cell (3A).

Abstract: A radio base station (1A) generates and holds associations each between a resource block and a piece of MIMO information and allocates, based on the associations, a resource block to radio terminals (2A and 2C) in the cell (3A). When the radio terminals (2A and 2C) in the cell (3A) suffers a predetermined level or higher level of interference caused by the communication between another radio base station (1B) and a radio terminal (2B) that exists in the cell (3B) of the other radio base station (1B), the radio base station (1A) selects one of the associations each between a resource block and a piece of MIMO information and allocates, based on the selected association, a resource block to the radio terminals (2A and 2C) in the cell (3A).

Abstract: The present invention relates to a cell search method for a multiband radio communication system including a mobile station and multiple base stations.

Abstract: When allocating CCEs as a radio resource to a new radio terminal within a predetermined sector, the disclosed radio base station (1) acquires the new AL corresponding to the new radio terminal, and identifies CCEs that cannot be allocated (non-allocatable CCEs) determined in response to an AL that is larger than said new AL. Furthermore, when a new search space wherein the CCE is completely unused exists among new search spaces corresponding to the new radio terminal, and when a non-allocatable CCE is contained in said new search space wherein the CCE is completely unused, the radio base station (1) allocates said non-allocatable CCE to the new radio terminal.

Abstract: When allocating CCEs as a radio resource to a plurality of radio terminals within a predetermined sector, the disclosed radio base station (1) acquires an AL for each radio terminal within the predetermined sector, and sets a CCE allocating order for the radio terminals in descending order of corresponding AL size. Furthermore, the radio base station (1) allocates CCEs to predetermined radio terminals to be allocated to in accordance with the set allocating order.

Abstract: A control unit (102) in a provided radio base station (1A) calculates an error rate for control information the radio base station (1A) had sent using a PDCCH to a radio terminal (2A). If the calculated error rate is outside a prescribed range, the radio base station (1A) confirms the status of a response from the radio terminal (2A) in reply to the control information sent using the PDCCH to the radio terminal (2A). The radio base station (1A) also corrects a reference SINR in accordance with the aforementioned response status.

Abstract: When estimating the quality (SINR) of a PDCCH corresponding to a local sector formed by a radio base station (1A), a control unit (102) in the radio base station (1A) confirms the status of a response from a radio terminal (2A) in reply to control information sent using the PDCCH to the radio terminal (2A). The radio base station (1A) corrects a reference SINR in accordance with the aforementioned response status, thereby obtaining an estimated value (estimated PDCCH-SINR).

Abstract: A control unit (102) in a radio base station (1A) receives from a radio terminal (2A) a measured W-CQI corresponding to a local sector, and also acquires the utilization ratio of a PDCCH corresponding to said sector. Also, in addition to receiving a measured W-CQI corresponding to the local sector, the control unit (102) in the radio base station (1A) acquires from other radio base stations (1B and 1C) utilization ratios of PDCCHs and PDSCHs corresponding to other sectors. Additionally, the control unit (102) in the radio base station (1A) estimates the PDCCH quality (SINR) corresponding to the local sector on the basis of a SINR obtained from the measured W-CQIs and also on the basis of the utilization ratios of PDCCHs and PDSCHs corresponding to other sectors.

Abstract: A control unit (102) in a radio base station (1A) receives from a radio terminal (2A) a measured W-CQI corresponding to a local sector, and also acquires the utilization ratio of a PDCCH corresponding to said sector. Also, in addition to receiving a measured W-CQI corresponding to the local sector, the control unit (102) in the radio base station (1A) acquires from other radio base stations (1B and 1C) utilization ratios of PDCCHs and PDSCHs corresponding to other sectors. Additionally, the control unit (102) in the radio base station (1A) estimates the PDCCH quality (SINR) corresponding to the local sector on the basis of a SINR obtained from the measured W-CQIs and also on the basis of the utilization ratios of PDCCHs and PDSCHs corresponding to other sectors.

Abstract: A control unit (102) in a radio base station (1A) receives a measurement W-CQI message from a radio terminal (2A) and acquires the usage rate of the PDCCH corresponding to the serving sector. Further, the control unit (102) in the radio base station (1A) multiplies the measurement W-CQI corresponding to the serving sector by the reciprocal of the usage rate of the PDCCH corresponding to the radio base station (1A), and thereby estimates the SINR of the PDCCH corresponding to the serving sector at the radio terminal (2A).

Abstract: A reception device 10 includes a channel estimator 130 configured to calculate channel estimation information for each of first to fourth known signals, the channel estimation information indicating estimation of a characteristic of a channel of the radio signal and an SNR estimator 150 configured to interpolate channel estimation information on an intersection by using the channel estimation information on each of the first known signal and the fourth known signal, the intersection being where a line joining the first known signal and the fourth known signal intersects with a line joining the second known signal and the third known signal, and to interpolate channel estimation information on the intersection by using the channel estimation information on each of the second known signal and the third known signal, and to calculate noise power of the radio signal on the basis of a difference between the interpolated two channel estimation information.

Abstract: Provided is a wireless communication apparatus which prevents deterioration of communication characteristics because of a transmission weight of a greatest common factor and enhances the communication characteristics of feedback MIMO.

Abstract: Provided is a wireless communication apparatus which prevents deterioration of a communication characteristics because of a transmission weight of a highest common factor and enhances the communication characteristics of feedback MIMO. A wireless communication apparatus having a plurality of antennas includes a reception unit for receiving signals of channels in a predetermined frequency band from another wireless communication apparatus and obtaining channel state information of the channels, a channel state information calculation unit for calculating a weighted average of the channel state information as representative channel state information of the predetermined frequency band overall based on power of the channel state information, a transmission weight selection unit for selecting a transmission weight based on the representative channel state information, and a transmission unit for transmitting identification information of the transmission weight to the another wireless communication apparatus.

Abstract: Provided is a wireless communication apparatus, which enhances communication characteristics of feedback MIMO by switching transmission weight selection processing based on a channel state to select a suitable transmission weight with a small calculation load.

Abstract: Provided is a wireless communication apparatus which prevents deterioration of communication characteristics because of a transmission weight of a greatest common factor and enhances the communication characteristics of feedback MIMO.

Abstract: A wireless communication apparatus prevents deterioration of communication characteristics because of a transmission weight of a highest common factor and enhances the communication characteristics of feedback MIMO.

Abstract: A radio base station (100) is provided with a stream determination unit (141) for determining whether communication quality of a radio communication channel between the radio base station (100) and a receiving device is lower than a predetermined threshold, and an antenna selector (142) for selecting, from among transmitting antennas (131-134), transmitting antennas such that the distance between the transmitting antennas (131-134) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.