Fujitsu Corporation

Fujitu Limited

Fujitsu Connected Technologies Limited

Yoshinori Tanaka

Yoshiaki Ohta

Yoshihiro Kawasaki

Katsumasa Sugiyama

Yoshiharu Tajima

Kazuhisa Obuchi

Tetsuya Yano

Kazuo Kawabata

Shunji Miyazaki

Akihide Otonari

Yoshinori Soejima

Hideto Furukawa

Shinya Okamoto

Chiaki Shinohara

Takayoshi Ode

Takaharu Nakamura

Yutaka Kobayashi

Naotoshi Watanabe

Ryuichi Takechi

Masaaki Suzuki

Manabu Kubota

Jianming Wu

Tsuyoshi Shimomura

Tomohiko Taniguchi

Masatsugu Shimizu

Takashi Dateki

Kenji Suda

Morihiko Minowa

Atsushi Tanaka

Hajime Hamada

Tokuro Kubo

Nobuhisa Aoki

Hitoshi Yokoyama

Akira Ito

Miki Yamasaki

Hirotoshi Shimizu

Takao Nakagawa

Junya Mikami

Daisuke Ogawa

Hideaki Yamada

Kensuke Sawada

Satoshi Nakamura

Mitsuo Kobayashi

Hiroaki Iwamoto

Mitsuhiro Azuma

Eisuke Fukuda

Syuuichi Murata

Makoto Uchishima

Kazuaki Imafuku

Mutsumi Saito

Junichi Niimi

Takahiro Matusaki

Yuka Araikawa

Norihiro Ikeda

Shingo Hotta

Hiroaki Arai

Masaru Inoue

Tokurou Kubo

Yoshihara Tajima

A wireless communications system including a mobile station MS and base stations BSand BS, wherein one or both of the mobile station MS and the base stations BSand BSis provided with a unit for notifying information of a frame position with the possibility of transmission of packets based on detection of deterioration of a reception quality and wherein the mobile station MS is provided with a unit for determining a frame position without the possibility of transmission of packets and shifting to a peripheral cell detection mode at this frame position based on information of a frame position with the possibility of transmission of packets, whereby it is possible to shift to a peripheral cell detection mode without lowering the transmission efficiency and without complicating the processing.

Wireless communications system, base station, and mobile station

A radio receiving apparatus for receiving the variable-length RLC PDU data in an RLC layer includes the buffer memory sectioned into a plurality of areas having a predetermined maximum data length of the RLC PDU data. By referring to a sequence number SN included in each received RLC PDU data, the radio receiving apparatus stores the RLC PDU data having an identical sequence number SN into an identical area, and assembles an RLC SDU data on a basis of the RLC PDU data stored in each area.

Radio communication apparatus

A radio communication system, that includes a source base station; a target base station; and a mobile station for receiving either first sequence number or second sequence number, or both of the first and second sequence numbers from the target base station, whereby the first sequence number is transferred from the source base station to the target base station and the second sequence number is added to PDCP (Packet Data Convergence Protocol) SDU (Service Data Unit) which is transferred from the source base station to the target base station.

Base station, mobile station, communication system, transmission method and reordering method

Instead of adding control information that should be passed on to two or more RLC entities or two or more PDCP entities on the counterpart side to data respectively in two or more RLC entities or two or more PDCP entities at the sending end, control information is added in MAC entity and then distributed to two or more RLC entities in MAC entity on the counterpart side.

Radio communication system and radio communication method

In a mobile communication system, a mobile station receives intermittently a channel transmitted by a first or second base station through a relay station. Herein, the relay station, before execution of a handover for switching a connection destination of its own station from the first base station to the second base station, transmits information on the second base station. The mobile station, based on the information on the second base station received from the relay station before the handover, controls a timing for receiving the channel from the relay station after the handover.

Radio communication method, relay station and mobile station

A wireless communication system comprising a transmitter configured to transmit a data signal and a control signal to the same mobile station and a control unit configured to regulate transmission power of the control signal in accordance with a reception status of the control signal in the mobile station.

Error rate control apparatus

In a radio communication system a first radio station performs communication by the use of a first radio signal. A second radio station receives a second radio signal which is indistinguishable from the first radio signal. A third radio station is in a radio communication area of the first radio station and a radio communication area of the second radio station. A communication format conversion unit generates a third radio signal by converting a communication format of the second radio signal to a communication format which is distinguishable from the first radio signal, and communicates with the third radio station by the use of the third radio signal.

Radio communication system

Radio communication apparatus for retransmitting data

A base station which is able to perform radio communications with a relay station and a mobile station, the base station includes a transmitter configured to transmit radio signals to the relay station in downlink backhaul subframes, and to limit transmission of radio signals to the relay station in subframes other than the downlink backhaul subframes; and a controller configured to allow, when performing a random access procedure to the relay station, the transmitter to transmit a message of the random access procedure even in the subframes other than the downlink backhaul subframes.

Radio communication system, base station, relay station, and radio communication method

A wireless communication system includes a wireless base station, a mobile station configured to communicate with the wireless base station, and a relay station configured to relay the communication between the wireless base station and the mobile station. When the number of the mobile stations communicating with the wireless base station is judged to have become smaller than or equal to a given number, a power controller in the relay station executes at least one of power control to cut off the power for relaying the communication, power control to perform intermittent operation, and power control to perform power-saving operation.

Wireless communication system

A mobile user terminal, which communicates with a base station in an intermittent fashion, the mobile user terminal includes a radio transmitter which transmits downlink channel quality information indicating downlink channel quality and an uplink pilot signal to a base station in an intermittent fashion; and a transmit time controller which synchronizes transmit time of the downlink quality information and transmit time of the uplink pilot signal relative to each other, such that the downlink quality information and the uplink pilot signal are sent in adjacent different timings in a period corresponding to a state of intermittent communicate.

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

Radio transmission apparatus, radio receiving apparatus, radio communication apparatus, radio transmission method, and radio receiving method

Growing community of inventors

Kawasaki, Japan

Kazuhisa Obuchi