Fujitsu Corporation

Hirotoshi Shimizu

Kazuhisa Obuchi

Akihide Otonari

Yoshinori Soejima

Shinya Okamoto

Miki Yamasaki

Chiaki Shinohara

Yoji Sugawara

Masatoshi Kimura

Takashi Dateki

Masashi Matsumoto

Yoshihiro Tomita

Yuji Uehara

Tatsuo Fujiwara

Yoshinori Wada

Masahiro Wanou

Takurou Nishikawa

Shinsuke Okazoe

Mamoru Horiuchi

Yasushi Fujioka

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

A mobile radio device capable of receiving a radio signal whose frequency band switches, includes a setting unit that when the frequency band of the radio signal is a first frequency band, sets a first threshold corresponding to the first frequency band, and that when the frequency band switches from the first frequency band to a second frequency band different from the first frequency band, sets for a given period, a third threshold that is between the first threshold and a second threshold corresponding to the second frequency band and subsequently sets the second threshold; and a determining unit that determines a travel speed of the mobile radio device, based on a comparison of a moving average obtained by temporally accumulating variations of estimates of propagation characteristics of the radio signal and averaging the accumulated variations by a moving average method using a threshold set by the setting unit.

Mobile radio device and determining method

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

A wireless communication apparatus that uses a communication protocol to transmit and receive data with a data check bit, including a received data determining section that performs a data check for received data by using the data check bit to determine whether the data is error; a received result transmitting section that, when determined to be error, discards the data and transmits a retransmission request to other wireless communication apparatus of the transmitting origin, whereas determined to be not error, transmits a message indicating that the data is normal to the other wireless communication apparatus of the transmitting origin; and a retransmission asking section that determines whether a format of the data is incorrect or normal, and when determined to be normal, passes the data to predetermined processing, whereas when determined to be incorrect, discards the data and asks the received result transmitting section to request retransmission of the data.

Wireless communication apparatus, wireless communication control apparatus, wireless communication method, wireless communication program storage medium, wireless communication control method, and wireless communication control program storage medium

Request for retransmission when format of data is incorrect

MAC entity produces a single PDU in such a way that two or more SDU's, which are received from RLC entity via logical channels, are integrated, and header H and MAC control information CONT are added. Transmission order information (time stamp TS) is added to the PDU. The PDU including the transmission order information is transferred to a transport channel, and then transmitted on a radio basis to an apparatus of the other party.

Radio apparatus, radio communication system, and radio information notification method

A communication system includes: a base station; and a mobile terminal for sequentially sending a plurality of data packets at a designated data transfer rate and information of velocity of the mobile terminal to the base station; the base station including: a receiver for receiving the data packet and the velocity information; a transmitter for transmitting a request to the mobile terminal to resend a data packet upon detection of an error in the data packet previously received; and a reply controller for setting number of requests to be repetitively sent in accordance with the velocity information and, after the number of requests have been sent, sending command to change the designated data transfer rate to the mobile terminal.

Communication system

A method for counting correctly substantial transmission times of a data unit such as an RLC-PDU even if the data unit is divided before being transmitted is provided. The method includes the steps of preparing a counter for the RLC-PDU (#), making a storage portion store a pointer indicating a position of a division PDU of the RLC-PDU to be transmitted every time when the division PDU obtained by dividing the RLC-PDU is transmitted (#), determining whether or not the transmission times should be counted along with a transmission of the division PDU to be transmitted based on the pointer of the division PDU to be transmitted and the pointer of a division PDU that was transmitted last time (#and #), and making the counter perform the count process when it is determined that the transmission times should be counted (#).

Method and device for counting transmission times of data unit, transmission device, and computer program

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

A display control device comprises: a cathode ray tube (CRT) control unit for transferring, to a CRT display, a CRT transfer clock signal, a video data signal and a synchronous signal in accordance with the CRT transfer clock signal generated from a first clock signal having a constant and stable cycle; and a liquid crystal display (LCD) control unit for transferring, to a LCD display, a LCD transfer clock signal, a video data signal and a synchronous signal in accordance with the LCD transfer clock signal generated from a second clock signal as a spread spectrum clocking signal generated based on the first clock signal.

Display control device

A radio receiver includes a first sampling section and a second sampling section for sampling, in the predetermined sampling interval, a first receiving symbol and a second receiving symbol transmitted to the radio receiver via a first transmission route and a second transmission route, respectively. The radio receiver further includes a diversity combining section for diversity combining sampling signals obtained by the respective sampling, sections and a control section for controlling a sampling position to obtain the difference between the sampling position of the first receiving symbol sampled by the first sampling section and the sampling position of the second receiving symbol sampled by the second sampling section such that the obtained difference is different from the difference in the sampling positions corresponding to the difference in timing between the first receiving symbol and the second receiving symbol.

Radio receiver with diversity receiving function

A system for controlling an image display which enables the efficiency of transfer of image data to be greatly improved when a control processor and display control unit access an image memory at alternate timings, the control processor updates the image data, and the display control unit displays the image data on a display, wherein the control processor is first made to wait so that the relative deviation in phase between the operational cycle (T1 to T4) of the control processor and the alternate access cycle of the control processor and display control unit specified by the display control unit is initially set to a certain relative relationship so that the two accesses do not conflict, then the image data is transferred without waiting.

Method and apparatus for controlling image display

Relay and exchange system for time division multiplex data

A checking method for a device having a plurality of light emitting elements, especially an LED array installed in electronic printing equipment. The check is done while the LED array is mounted in the equipment and does not require removal thereof. The check is done in a short time period, so it can be done during a period of page change of the printer, without disturbing the operation of the printer. Each of the LEDs are lighted one by one with a pulse. The output emission of the array is detected by a photoelectric detector which is positioned to detect the emission from any of the LEDs. The output of the detector becomes a burst of pulses, each of the pulses representing the emission property of a corresponding LED. Each pulse is converted into a digital signal and stored in a RAM as emission data. The emission data is fed back to the driver of each LED to compensate for differences in the emission characteristics of the LEDs. This improves the uniformity of the output image the electronic printer. Each time of the check is performed, the RAM is rewritten. Thereby, a change in the emission data indicates a change or degradation of one or more of the LEDs. This enables one to forecast the life expectancy of the LED array, and maintenance of the printer becomes easier.

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Kawasaki, Japan

Hirotoshi Shimizu