Fujitsu Corporation

Hitoshi Yokoyama

Takayoshi Ode

Kazuhisa Obuchi

Kazuo Kawabata

Kenji Suda

Daisuke Nitta

Kotaro Shiizaki

Takao Nakagawa

Satoshi Yamamoto

Koji Tsubouchi

Hiroki Akiyama

A wireless access system in which a first operator and a second operator share a predetermined band, includes a first base station belonging to the first operator, the first base station configured to transmit broadcast information indicating a priority of the first operator in the predetermined band; and a second base station belonging to the second operator, the second base station configured to perform wireless communication using a band configured based on a priority of the second operator in the predetermined band and the broadcast information transmitted by the first base station.

Wireless access system

A base station performs wireless communication with a first apparatus, and performs wired communication with a second apparatus. When a first communication speed corresponding to a wireless quality of the wireless communication is higher than a second communication speed of the wired communication, the base station changes a currently set modulation and coding scheme to a modulation and coding scheme corresponding to the second communication speed.

Apparatus for controlling modulation and coding scheme depending on communication speed

A communication device that is capable of communicating with a mobile terminal in cooperation with another communication device, and is capable of communicating with the mobile terminal via the other communication device. This communication device characteristically includes: a mode selecting unit configured to select one of a cooperative communication mode and a relayed communication mode, the cooperative communication mode being for transmitting notification information to the mobile terminal, the notification information being for causing the other communication device to perform a cooperative communication, the relayed communication mode being for causing the other communication device to relay notification information to the mobile terminal; and a mode information transmitting unit configured to transmit mode information to the other communication device, the mode information indicating a result from the mode selecting unit.

Communication devices, mobile terminal, in a cooperative communication system

A communication system includes a base station and a mobile terminal device. The base station includes a detection information notifying unit. The detection information notifying unit notifies, using a predetermined control channel, the mobile terminal device of detection information that includes a power-saving time that indicates a time that elapses before the base station enters a power-saving state. The mobile terminal device includes a detecting unit and a region information notifying unit. The detecting unit, when being notified of the detection information by the detection information notifying unit, detects a region in which a mobile terminal device is not capable of communicating with any base station based on the power-saving time included in the detection information. The region information notifying unit notifies a given base station of information on the region detected by the detecting unit.

Communication system, communication method, mobile terminal, device, and base station

A wireless communication system including: a terminal, and a base station including an antenna configured to perform wireless communication with the terminal, and a processor configured to perform, when a difference between a first throughput at a radio layer for the wireless communication and a second throughput at an upper layer to the radio layer for the wireless communication is larger than a given value, a processing to decrease errors at a radio layer for the wireless communication.

Wireless communication system, base station, and wireless communication method

A communication apparatus includes a receiving unit, an extracting unit, a generating unit and a transmitting unit. The receiving unit receives a signal from a first network using a first communication method. The extracting unit extracts, from a signal received via a control channel of the first network, notification information that is broadcast to be notified to a communication apparatus belonging to the first network and also used by a communication apparatus belonging to a second network. Here, the second network uses a second communication method different from the first communication method. The generating unit generates a notification frame used to notify the communication apparatus belonging to the second network of the notification information. The transmitting unit transmits the notification frame to the communication apparatus belonging to the second network.

Communication apparatus and communication method for extracting notification information from received signal and transmitting notification information

A transmitting station in the radio system performing scheduled transmission to a plurality of user terminals including: a plurality of antennas and a reception unit configured to obtain reception quality information estimated from a pilot channel among information fed back from each of the plurality of user terminals, to determine based on the obtained reception quality information, a transmission system for the plurality of antennas and a transmission unit configured to add a specific bit which identifies the determined transmission system to a scheduler management channel, and to vary contents of the other bit area in the scheduler management channel, as corresponding to the specific bit, and further transmit the scheduler management channel to the plurality of user terminals.

Radio communication system using multi-antenna transmission technique, and multi-user scheduler therefor

A wireless communication device including: a plurality of antennas configured to perform a plurality of wireless communication protocols simultaneously, and a processor configured to obtain each of a plurality of power consumptions for each of the plurality of the wireless communication protocols, to obtain each of a plurality of communication throughput for each of the plurality of the wireless communication protocols, to calculate an aggregated communication efficiency of the wireless communication using the plurality of wireless communication protocols simultaneously based on the plurality of the power consumptions and the plurality of the communication throughput, and to control the plurality of the antennas, when the aggregated communication efficiency exceeds a given value, as to perform the plurality of wireless communication protocols simultaneously, and, when the aggregated communication efficiency is equal to or less than the given value, as to stop one of the plurality of wireless communication protocols.

Wireless communication device and wireless communication method

A relay station capable of communicating with a first base station, a second base station, and a mobile station, includes a relay unit configured to relay communication between the first base station and the mobile station; a receiving unit configured to receive load information concerning the second base station; and a changeover unit configured to change, from the first base station over to the second base station, a communication counterpart of the mobile station, communicating with the mobile station via the relay unit, the communication counterpart being changed based on the received load information.

Relay station, base station, mobile station, communication system, and communication method

A method of detecting a hole area to be generated in a cover area of a communication system which includes a plurality of base station apparatuses and mobile station apparatuses, includes: measuring received powers from the plurality of base station apparatuses at the mobile station apparatuses, and, based on the received power from the other base station apparatus among a plurality of base station apparatuses other than the base station apparatus which covers a cell in which the mobile station apparatuses are positioned, detecting a hole area to be generated when a signal output from the base station apparatus is stopped.

Communication system, method of detecting hole area, base station apparatus, and mobile station apparatus

A management device includes a managing unit that manages whether a dedicated access slot different from an access slot is assigned to the mobile terminal unit, the access slot being arbitrarily used by a mobile terminal unit when the mobile terminal unit gets random access to a base station unit, a selecting unit that selects a dedicated access slot which has not been assigned among dedicated access slots managed by the managing unit when having received a priority notification indicating that a mobile terminal unit being a communicating destination of the base station unit is a priority terminal given priority for performing communication, and an instructing unit that instructs the base station unit managed by the management device to reserve the dedicated access slot selected by the selecting unit.

Wireless communication system, management device, and mobile terminal unit

A radio communications apparatus transmitting data using multiple antennas is disclosed that includes a data link layer control information generation part configured to generate multiple data link layer control information items from generated data link layer control information; a data unit generation part configured to generate multiple data units to be transmitted through the corresponding antennas, based on the data link layer control information items generated by the data link layer control information generation part, so that the data units include the data link layer control information items; and a physical layer processing part configured to perform adaptive modulation and coding on the data units.

Radio communications apparatus and communication method

A wireless base station includes a first receiving section which receives data from a plurality of terminals positioned within a wireless area in which data communication with a processing section on a network is performed by the wireless base station via a core network, a multiplexing controller which shares, with the processing section, first identification information allocated to a group and second identification information allocated to each of a plurality of member terminals constituting the group, and controls to determine whether a terminal serving as a source of the received data is a member terminal belonging to the group, based on the second identification information, and to multiplex, of the received data from the plurality of terminals, data from the terminal determined to be the member terminal belonging to the group, based on the first identification information, and a first sending section sends the multiplexed data to the core network.

Wireless base station, wireless communication system, and wireless communication method

In a communication terminal that performs bidirectional communication using different frequencies for transmission and reception, a receiving unit receives reception signals transmitted from the base station, a detecting unit detects the timing of DL when the receiving unit receives the reception signals, an adjusting unit adjusts the timing of UL to transmit the transmission signals so as to synchronize the timing of the DLand the timing of the UL, and a transmitting unit transmits transmission signals to the base station based on the timing of UL adjusted.

Communication terminal device, base station, and communication method

A communication apparatus for communicating via a frame containing a plurality of first type blocks into which pilot information is inserted and a plurality of second type blocks into which control information or data is inserted, the communication apparatus including a channel estimation accuracy predicting unit for predicting channel estimation accuracy of each of the plurality of second type blocks based on channel estimate values of the plurality of first type blocks in the frame. The communication apparatus includes an allocation determining unit for determining an allocation based on priority information containing a priority of each type of the control information and data such that control information or data of a higher-priority type is inserted into a block among the plurality of second type blocks with higher channel estimation accuracy.

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Kawasaki, Japan

Hitoshi Yokoyama