Abstract: A radio frame control device comprises a controlling unit, a resource block allocation unit, and a resource block conversion unit. The controlling unit controls a downlink radio frame of an orthogonal frequency division multiple access scheme. The resource block allocation unit allocates resource blocks to a terminal station using any one of a plurality of resource block allocation methods respectively having different restrictions. The resource block conversion unit determines whether or not conversion is possible from allocation information of resource blocks allocated according to a first resource block allocation method into resource block allocation information by a second resource block allocation method. The resource block conversion unit converts the resource block allocation method for the resource block allocation information when the conversion is possible.

Abstract: An initial access setting information generating apparatus includes a preamble information transmission number obtaining unit that receives and obtains the number of transmissions for preamble information in a non-contention type initial access procedure performed between a base station and a communication terminal, where the preamble information transmission number obtaining unit receives and obtains the number of transmissions after the initial access procedure is completed; an expected reception power determination unit that determines an expected reception power at the base station, based on the number of transmissions for the preamble information, which is obtained by the preamble information transmission number obtaining unit; and a set value communication unit that generates and outputs initial access setting information about the initial access procedure for the communication terminal, based on the expected reception power determined by the expected reception power determination unit.

Abstract: A threshold computation apparatus obtains estimated interference power for an uplink from a terminal to a base station; a predetermined communication quality value necessary for the uplink; a maximum value of transmission power of the terminal; and transmission power of the base station for a downlink from the base station to the terminal. The apparatus subtracts a logarithmic value of the maximum value of the transmission power of the terminal from a logarithmic value of the transmission power of the base station for the downlink; adds a logarithmic value of the communication quality value and a logarithmic value of the estimated interference power to a result of the subtraction; and determines a result of the addition to be a logarithmic value of received power at the terminal; and computes a threshold based on the logarithmic value of the received power at the terminal and predetermined conditions.

Abstract: A wireless resource allocation apparatus performs determining an amount of VoIP traffic for each terminal station; determining whether semi-persistent scheduling or dynamic scheduling is used for transmitting each packet of the VoIP traffic, based on a result of the determination for the amount of the VoIP traffic; managing, for each terminal station, a resource block allocated in the semi-persistent scheduling; and managing each resource block which is not managed for the allocation in the semi-persistent scheduling and is allocated in the dynamic scheduling. If it is determined that the dynamic scheduling is used for transmitting each packet of the VoIP traffic to a terminal station, the resource block, which has been managed for the relevant terminal station as a resource block allocated in the semi-persistent scheduling, is released, and the released resource block is managed as a resource block allocated in the dynamic scheduling.

Abstract: A reference signal transmission scheduling device, which performs scheduling on uplink transmission of a reference signal (SRS) from a mobile terminal to a base station in a wireless communication system, is designed to appropriately allocate an SRS transmission resource to the mobile terminal in consideration of the current circumstances of the mobile terminal. Herein, the maximum value of an SRS bandwidth is calculated based on the maximum transmission-enabled power of the mobile terminal, while the minimum value of the SRS bandwidth is calculated based on the mobility of the mobile terminal. Additionally, the SRS bandwidth, which is actually used by the mobile terminal subjected to SRS transmission resource allocation, is determined within the range between the maximum value and the minimum value of the SRS bandwidth.

Abstract: A frequency block allocation apparatus based on a single carrier frequency division multiple access method includes an allocation index computation target selector that selects frequency block groups, each consisting of one or more continuous non-allocated frequency blocks from a set of non-allocated frequency blocks; an allocation index computation unit that computes an allocation index for each target pair of each frequency block group and a terminal; and a frequency block allocation unit that determines one of the target pairs to be a frequency block allocation target, in accordance with priority based on the computed allocation indexes.

Abstract: A transmission power control device is able to capture the serving sector measurement information of a mobile station with respect to a serving sector and the neighboring sector measurement information of the mobile station with respect to a neighboring sector. The transmission power control device selects a power control mode based on a decision as to whether or not the neighboring sector measurement information has been captured in an applied time in the past. The power level of a mobile station is determined based on the selected power control mode. Thus, it is possible to reduce inter-cell interference and inter-sector interference because the power level of a mobile station is determined in light of communication environments, even though the mobile station is connected with a base station in an LTE-based communication system which cannot always detect the neighboring sector measurement information.

Abstract: A radio base station apparatus of the invention includes a scramble code-generating part that generates a different scramble code for each sector, at least for adjacent sectors, and a scrambling part that uses a scramble code generated by said scramble code-generating part to scramble a scrambling-target portion in said downlink sub-frame. This contributes to increasing extraction precision when extracting a desired signal from a signal that was affected by interference between/among sectors.

Abstract: A threshold computation apparatus obtains estimated interference power for an uplink from a terminal to a base station; a predetermined communication quality value necessary for the uplink; a maximum value of transmission power of the terminal; and transmission power of the base station for a downlink from the base station to the terminal. The apparatus subtracts a logarithmic value of the maximum value of the transmission power of the terminal from a logarithmic value of the transmission power of the base station for the downlink; adds a logarithmic value of the communication quality value and a logarithmic value of the estimated interference power to a result of the subtraction; and determines a result of the addition to be a logarithmic value of received power at the terminal; and computes a threshold based on the logarithmic value of the received power at the terminal and predetermined conditions.

Abstract: A handover parameter control apparatus in each cell of a cellular system having a condition in which if power received by a mobile terminal from a neighbor base station and power received from an access base station, to which the mobile terminal is connected, have power difference greater than or equal to a threshold, the mobile terminal executes handover from an access cell belonging to the access base station to a neighbor cell belonging to the neighbor base station. The apparatus includes a threshold control weight computation unit that computes a threshold control weight which indicates a threshold control direction so as to reduce handover failures, by using a frequency of first-type handover failure events which reduces by increasing the threshold; and a frequency of second-type handover failure events which reduces by decreasing the threshold; and a threshold determination unit that determines the threshold based on the threshold control weight.

Abstract: A reference signal transmission scheduling device, which performs scheduling on uplink transmission of a reference signal (SRS) from a mobile terminal to a base station in a wireless communication system, is designed to appropriately allocate an SRS transmission resource to the mobile terminal in consideration of the current circumstances of the mobile terminal. Herein, the maximum value of an SRS bandwidth is calculated based on the maximum transmission-enabled power of the mobile terminal, while the minimum value of the SRS bandwidth is calculated based on the mobility of the mobile terminal. Additionally, the SRS bandwidth, which is actually used by the mobile terminal subjected to SRS transmission resource allocation, is determined within the range between the maximum value and the minimum value of the SRS bandwidth.

Abstract: An initial access setting information generating apparatus includes a preamble information transmission number obtaining unit that receives and obtains the number of transmissions for preamble information in a non-contention type initial access procedure performed between a base station and a communication terminal, where the preamble information transmission number obtaining unit receives and obtains the number of transmissions after the initial access procedure is completed; an expected reception power determination unit that determines an expected reception power at the base station, based on the number of transmissions for the preamble information, which is obtained by the preamble information transmission number obtaining unit; and a set value communication unit that generates and outputs initial access setting information about the initial access procedure for the communication terminal, based on the expected reception power determined by the expected reception power determination unit.

Abstract: An in-phase component (I channel) and a quadrature component (Q channel) are interchanged between modulation symbols of an 8PSK system to be assigned to subcarriers of an OFDM system.

Abstract: A transmission power control device is able to capture the serving sector measurement information of a mobile station with respect to a serving sector and the neighboring sector measurement information of the mobile station with respect to a neighboring sector. The transmission power control device selects a power control mode based on a decision as to whether or not the neighboring sector measurement information has been captured in an applied time in the past. The power level of a mobile station is determined based on the selected power control mode. Thus, it is possible to reduce inter-cell interference and inter-sector interference because the power level of a mobile station is determined in light of communication environments, even though the mobile station is connected with a base station in an LTE-based communication system which cannot always detect the neighboring sector measurement information.

Abstract: A transmission power control apparatus is provided with: an interference information acquisition unit which acquires interference information indicative of an interference amount for each frequency block in a neighboring base station; and a transmission power control unit which control the transmission power of a mobile terminal when a frequency block group configured by one or more frequency blocks is allocated to the mobile terminal, based on the interference information acquired by the interference information acquisition unit.

Abstract: A wireless resource allocation apparatus performs determining an amount of VoIP traffic for each terminal station; determining whether semi-persistent scheduling or dynamic scheduling is used for transmitting each packet of the VoIP traffic, based on a result of the determination for the amount of the VoIP traffic; managing, for each terminal station, a resource block allocated in the semi-persistent scheduling; and managing each resource block which is not managed for the allocation in the semi-persistent scheduling and is allocated in the dynamic scheduling. If it is determined that the dynamic scheduling is used for transmitting each packet of the VoIP traffic to a terminal station, the resource block, which has been managed for the relevant terminal station as a resource block allocated in the semi-persistent scheduling, is released, and the released resource block is managed as a resource block allocated in the dynamic scheduling.

Abstract: A frequency block allocation apparatus based on a single carrier frequency division multiple access method includes an allocation index computation target selector that selects frequency block groups, each consisting of one or more continuous non-allocated frequency blocks from a set of non-allocated frequency blocks; an allocation index computation unit that computes an allocation index for each target pair of each frequency block group and a terminal; and a frequency block allocation unit that determines one of the target pairs to be a frequency block allocation target, in accordance with priority based on the computed allocation indexes.

Abstract: An adaptive rotation angle control apparatus of this invention includes a communication quality approximating equation storage portion which stores a communication quality approximating equation including as variables reception quality information, amplitude fluctuation information, and a rotation angle; a computation portion which substitutes into the communication quality approximating equation the reception quality information and amplitude fluctuation information of the input information, and a rotation angle, and calculates the value of the communication quality approximating equation; and an adaptive control portion which provides a rotation angle to the computation portion, receives from the computation portion communication quality information, which is the value of the communication quality approximating equation calculated using the rotation angle provided, and determines the optimum rotation angle based on the received communication quality information.

Abstract: A radio base station apparatus of the invention includes a scramble code-generating part that generates a different scramble code for each sector, at least for adjacent sectors, and a scrambling part that uses a scramble code generated by said scramble code-generating part to scramble a scrambling-target portion in said downlink sub-frame. This contributes to increasing extraction precision when extracting a desired signal from a signal that was affected by interference between/among sectors.

Abstract: A radio frame control device comprises a controlling unit, a resource block allocation unit, and a resource block conversion unit. The controlling unit controls a downlink radio frame of an orthogonal frequency division multiple access scheme. The resource block allocation unit allocates resource blocks to a terminal station using any one of a plurality of resource block allocation methods respectively having different restrictions. The resource block conversion unit determines whether or not conversion is possible from allocation information of resource blocks allocated according to a first resource block allocation method into resource block allocation information by a second resource block allocation method. The resource block conversion unit converts the resource block allocation method for the resource block allocation information when the conversion is possible.