Fujitsu Corporation

Hideto Furukawa

Yoshiharu Tajima

Kazuhisa Obuchi

Kazuo Kawabata

Takashi Dateki

Yoshihiro Kawasaki

Yoshiaki Ohta

Daisuke Ogawa

Kazuo Nagatani

Yasuyuki Oishi

Nobutsugu Fujino

Takeshi Inoue

Atsushi Yamashita

Satoru Chikuma

Tetsuyoshi Takenaka

Makoto Yoshida

Tomonori Sato

Masahiko Shimizu

Koji Matsuyama

Hidenobu Fukumasa

Nami Hatazoe

Tetsuya Yano

Nobukazu Fudaba

Tsuyoshi Hasegawa

Masaaki Fujii

Takeshi Takano

Kaneyasu Shimoda

Eisuke Fukuda

Kazuhisa Ohbuchi

Toshihiko Nawa

A radio communication system that includes an encoder configured to perform error correction coding for control channel information by a given error correction coding rate; a modulator configured to perform modulation of the error correction coded control channel information for transmission according to a given modulation scheme; and a processing section configured to perform code decimation of the error correction coded control channel information prior to the modulation, the code decimation being different according to whether the Multi Input Multi Output is applied or not.

Control channel information transmission method, and base station and terminal using the same method

A radio communication system that includes an encoder configured to perform error correction coding for control channel information by a given error correction coding rate and a modulator configured to perform modulation of the error correction coded control channel information for transmission according to a given modulation scheme, code decimation being performed for the error correction coded control channel information prior to the modulation, and the code decimation being different according to whether Multi Input Multi Output is applied or not.

A wireless communication system including a sender apparatus having a plurality of transmitting antennas that performs MIMO transmission of a plurality of data blocks; and a receiver apparatus that receives the plurality of data blocks. The sender apparatus transmits a process number via a control channel different from a data channel to the receiver apparatus, and wherein when the MIMO diversity transmission is performed, the receiver apparatus performs HARQ processing in the received data blocks based on not a process number which prevents the data blocks from competing but the received process number from the sender apparatus.

Transmission controlling method, sender apparatus and receiver apparatus for wireless communication system

A radio communication system includes a mobile station configured to: intermittently receive information indicating a transmission format used for a shared channel via which data is received from a radio communication apparatus, intermittently transmit Channel Quality Indicator (CQI) information relating to the transmission format used for the shared channel in a first mode, set the timing of the intermittent transmission of the CQI information a given time before the reception of the information indicating a transmission format used for the shared channel, the CQI information being transmitted periodically, and switch from the first mode to a second mode in which the CQI information is transmitted more frequently than in the first mode; and the radio communication apparatus configured to communicate with the mobile station.

Radio communication apparatus

In transmission in which MIMO is applied, there have been problems that the number of variable parameters increases and the number of information bits necessary for control channel increases. When the number of simultaneous multiplex users in one frame increases, there is also a problem of increased control channel information in proportion to the number of users. Error correction coding is performed for the control channel information based on the Adaptive Modulation and Coding scheme, and the above error correction coded control channel information is transmitted after being modulated with a predetermined modulation scheme, and further, according to propagation condition, the coding rate in the above error correction coding is made variable.

A transmission controlling method for a wireless communication system wherein a plurality of data blocks can be transmitted from a sender apparatus having a plurality of sending antennas to a receiver apparatus, the transmission controlling method includes on the sender apparatus, sending process information which is not competitive between data blocks to the receiver apparatus with a control channel; and sending the data block to the receiver apparatus; and on the receiver apparatus, receiving the data block and the process information from the sender apparatus.

In a wireless communication system, a sender apparatus sends a data block, for each of a plurality of stream data, with data block identification information, which does not conflict between stream data, annexed, and a reception apparatus performs a re-sending synthesis process for a data block received already and a re-sending data block to which the same data block identification information is individually annexed based on the data block identification information annexed to the received data block. Consequently, also in a case wherein the number of transmission streams between the sender apparatus and the reception apparatus is varied (reduced), the matching property of the data block which is a re-sending synthesis target can be maintained and communication can be continued normally.

To alleviate processing load of a communication apparatus (mobile station) for data transmission using the shared channels. A radio communication apparatus for receiving data via the shared channels, comprises a receiving unit for intermittent reception to determine whether the data received via the shared channels is transmitted to its own station or not in the first operational mode and a transmitting unit for intermittent transmission of information which influences the transmission format of the data a predetermined time before the intermittent reception timing of the receiving unit in the first mode.

Radio communication method of intermittently transmitting channel quality indicator (CQI) information

A transmission controlling method for a wireless communication system wherein a plurality of data blocks can be transmitted from a sender apparatus having a plurality of sending antennas to a receiver apparatus, the transmission controlling method including on the sender apparatus, sending process information which prevent plurality of data blocks from competing to the receiver apparatus with a control channel; and on the receiver apparatus, combining, based on the process information, the data block received already and a re-sent data block.

A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information.

Radio channel control method and receiving apparatus

A wireless communication system including a sender apparatus having a plurality of transmitting antennas that transmits a plurality of data blocks; and a receiver apparatus that receives the plurality of data blocks, wherein the sender apparatus transmits a process number via a control channel different from a data channel to the receiver apparatus, and wherein the receiver apparatus performs HARQ processing of received data blocks based on the received process number which prevents the data blocks from competing.

A radio communication apparatus that includes a receiver that accomplishes intermittent reception of information in a first mode, the information indicating a transmitting format used for a shared channel via which data is received and a transmitter that accomplishes intermittent transmission of quality information at a timing in the first mode, the quality information relating to the transmitting format; and a controller that sets in advance the timing of the intermittent transmission so as to become a given time before a timing of the intermittent reception.

In a radio communication system in which multiple bands or a plurality of different radio frequencies are used, a different radio transmission method is used in each band or at each radio frequency. For example, by transmitting data using radio formats which are different in each band or at each radio frequency, the radio transmission method is made different in each band or at each radio frequency. In order to vary the radio format, (1) the pilot length is varied at each radio frequency; or (2) the pilot interval is varied at each radio frequency; or (3) the guard interval length is varied in each band or at each radio frequency; or (4) when multicarrier modulation is used for radio communication in each band, the subcarrier interval for multicarrier transmission is varied in each band.

Radio communication system

A wireless communication system comprises a mobile station and a base station, which use a plurality of communication channels and a pilot channel corresponding to at least one of the communication channels. The base station has a transmitting unit that employs at least one of the communication channels as a priority channel and transmits channel information of this priority channel and the other channels by use of a communication channel other than the pilot channel. The mobile station has a determining unit that determines a reception level of the pilot channel; an acquiring unit that acquires the channel information transmitted via the communication channel other than the pilot channel; and a deciding unit that decides, as an available communication channel, at least one of the communication channels based on both the channel information acquired by the acquiring unit and the reception level determined by the determining unit.

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Kawasaki, Japan

Hideto Furukawa