Fujitsu Corporation

Takaharu Kobayashi

Dai Kimura

Takashi Dateki

Tsuyoshi Shimomura

Takashi Seyama

Teppei Oyama

Hideki Furudate

Toshiro Sawamoto

Naoyuki Saitou

A communication system includes a plurality of first communication control devices that are arranged in association with a plurality of operators, and a second communication control device that is connected to the first communication control devices. The first communication control device calculates an effect evaluation value in a case where bands used by an operator of subject are increased and reduced and transmits information containing the effect evaluation value to the second communication control device. The second communication control device specifies a combination of radio devices and a combination of operators that maximize a value of change in a case where each operator changes the used bands of the radio devices and instructs the first communication control devices corresponding to the operators of the specified combination to increase and reduce the used bands of the radio devices of the specified combination.

Communication system and communication control device

A communication control apparatus allocates, to a plurality of operators, a band of each of a plurality of radio units that are shared by the operators and that are connected to a plurality of baseband units managed by the operators. The communication control apparatus includes: a memory; a processor that allocates the band of each of the radio units to the operators in accordance with an upper band use limit that is set for each of the radio units such that a use band used by the operators does not exceed the upper band use limit; and an output unit that outputs allocation information indicating the band allocated to the operators by the processor to each of the baseband units.

Communication control apparatus and communication control method

A base station that includes: a memory; and a processor that is connected to the memory and that is configured to: select one or more terminals to communicate with from plural terminals with which communication is possible using metric values calculated using an error correction offset value corresponding to a number of terminals being selected; and decide on at least one of a modulation scheme or a coding rate for each terminal selected.

Base station and terminal selection method

A base station includes a control unit that controls one or more identifiers to be installed on a plurality of transmission points in accordance with the number of control signals transmitted from the transmission points to one or more wireless terminals or the number of radio resources used to transmit the control signals to the one or more wireless terminals.

Base station, wireless communication system, and base station processing method

A transmission control device includes an acquiring unit that acquires propagation delay time for each propagation path between a plurality of terminal devices and a plurality of transmitter stations; a selector that selects, based on the propagation delay time acquired by the acquiring unit, combinations of terminal devices having similar propagation delay differences from the plurality of the transmitter stations; and a controller that controls transmission timing of the plurality of the transmitter stations that transmit signals to the combinations of the terminal devices selected by the selector.

Transmission control device and transmission control method

A communication device that is configured to: compute reflected transmission weights based on timing correction coefficients to be applied to each of a plurality of antennas according to reception timings of uplink signals from a plurality of wireless terminals that receive multiplexed downlink signals transmitted from the plurality of antennas, and on respective channel estimation values between the plurality of antennas and the plurality of wireless terminals, the computed reflected transmission weights reflecting the timing correction coefficients and being computed at first frequency intervals; compute interpolated transmission weights by interpolating between the computed reflected transmission weights at second frequency intervals that are narrower than the first frequency intervals; and compute transmission weights to be applied to downlink signals by, based on the timing correction coefficients, correcting the interpolated transmission weights that have been interpolated such that the timing correction coefficients are reflected a second time.

Communication device, communication system, and communication method

A transmission control apparatus determines a group of terminal devices that are destinations to which signals are simultaneously transmitted out of a plurality of terminal devices. The transmission control apparatus includes a processor that executes a process including: calculating received power vectors corresponding to received power of the respective terminal devices; determining, based on an inner product between a received power vector of a first terminal device that is determined to belong to the group of terminal devices already and a received power vector of a second terminal device that is a candidate to be newly added to the group of terminal devices, whether to add the second terminal device to the group of terminal devices; and generating transmission signals to be transmitted to a group of terminal devices that are determined in accordance with determination at the determining.

Transmission control apparatus and transmission control method

A communication system includes a first base station that forms a first coverage area, and a second base station that forms a second coverage area different from the first coverage area and uses a same as a radio resource to be used by the first base station, wherein the second base station determines a number of assignment streams at the second base station in the radio resource, computes a number of interference signals removable by the second base station in the radio resource based on a number of receiving antennas included in the second base station and the number of assignment streams, and notifies the first base station of the number of interference signals in the radio resource, and the first base station determines a number of assignment streams at the first base station in the radio resource by using the number of interference signals as an upper limit.

Communication system, base station, and base-station control method

A control device including: a processor configured to: receive first and second quality information indicating qualities of wireless signals transmitted from a first and a second base stations, determine a first and a second ratios based on the first and the second quality information, the first ratio being a ratio with which the base stations perform a coordinated transmission, the second ratio being a ratio with which the first base station performs an uncoordinated transmission, and determine a coordination pattern based on the ratios, the coordination pattern indicating a first wireless resource and a second wireless resource in a specified wireless resource, the first and the second wireless resources being allocated to the coordinated transmission and the uncoordinated transmission, the coordinated pattern being applied to a specified period including a plurality of units of period each being a unit of period for wireless transmission in a wireless communication system.

Control device, control method, and base station

A wireless communication system includes a first access point that forms a first wireless area and a second access point that forms a second wireless area. The first access point controls the scheduling of a terminal located in the first wireless area based on the state of a communication channel between a terminal which is a candidate for scheduling by the second access point and the first access point.

Wireless communication system, wireless communication control method and access point

Connection destinations of a plurality of wireless terminals are selected from a plurality of connection destination candidates to maximize an evaluation value based on each of data rates in cases where each of the wireless terminals is connected to each of the connection destination candidates and each of resource allocation rates for each of the wireless terminals at each of the connection destination candidates.

Wireless communication system, communication control method, control device, control method, control program, and wireless terminal

A communication control apparatus including a processor is provided. The processor is configured to calculate a first predicted communication quality of a mobile station apparatus in a state not including an interference signal from one or more cells among surrounding cells in accordance with measurement results of a quality of reception of a signal from a serving cell and strength of interference signals from the surrounding cells as measured by the mobile station apparatus, and judge permission for transmission of signals by the one or more cells in a radio resource of communication of the mobile station apparatus based on the first predicted communication quality.

Communication control apparatus, base station apparatus, and communication control method

A wireless communication system includes a base station including a determining section that determines control information indicating signal processing for each of wireless resources used for wireless communication with terminal equipment units, and remote access sections each including a first signal processing section that performs first signal processing on a first downlink signal received from the base station so as to generate a second downlink signal to be transmitted to the units via the wireless communication, and a second signal processing section that performs second signal processing on a second uplink signal received from the units via the wireless communication so as to generate a first uplink signal to be transmitted to the base station, and at least one of the first signal processing and the second signal processing being performed for each of the wireless resources based on the control information.

Wireless communication system, remote access device, and base station device

A terminal includes a data receiver that receives data transmitted by a base station to another mobile terminal, a response receiver that receives from the other mobile terminal a negative acknowledgement response indicating that the other mobile terminal has failed to receive the data normally, and a data transmitter that transmits to the other terminal the data, received by the data receiver, in response to the negative acknowledgement response received by the response receiver.

Mobile terminal, base station, communication system, and communication method

A wireless communication method includes, at each base station, respectively forming first and second communication regions at the edges of a cell of the each base station by changing the direction of a directional antenna in synchronization with other surrounding base stations at a given cycle period, where each first communication region is configured so that a first level is reached in the antenna gain between the sectors contained in the cell of the each base station and the sectors included in the cells of the other base stations, and where each second communication region is configured so that a second level lower than the first level is reached in the antenna gain, and, at each mobile station, combining signals from a given number of base stations during a time period in which the sum of incoming signal levels from the given number of base stations satisfies given conditions.

Growing community of inventors

Yamato, Japan

Takaharu Kobayashi