Abstract: A multiservice is implemented by connecting one base station and one terminal via one wireless link. There is provided communication control means 2-1 that performs communication in compliance with an OFDMA scheme having traffic channels including first sub-channels for containing information showing enabled or disabled sub-channels and second sub-channels for storing data pertaining to services in correspondence with the first sub-channels, that allocates a plurality of first sub-channels to a plurality of services, respectively, and that connects one base station to one terminal via one wireless link, thereby establishing communication pertaining to the plurality of services.

Abstract: Provided is a wireless communication system for performing communication using a shared control channel that can be used in a predetermined period for each of a plurality of base stations and a plurality of traffic channels that can be adaptively allocated to each of a plurality of wireless communication terminals. The wireless communication terminal is provided with a channel requesting unit that requests the base station to allocate an individual control channel through the shared control channel and a communication control unit that performs control information communication by wirelessly connecting the individual control channel allocated from the base station. The base station is provided with a channel allocating unit that allocates one of the traffic channels as the individual control channel to be exclusively used for the wireless communication terminal when the request of individual control channel allocation is received from the wireless communication terminal through the shared control channel.

Abstract: A multiservice is implemented by connecting one base station and one terminal via one wireless link. There is provided communication control means 2-1 that performs communication in compliance with an OFDMA scheme having traffic channels including first sub-channels for containing information showing enabled or disabled sub-channels and second sub-channels for storing data pertaining to services in correspondence with the first sub-channels, that allocates a plurality of first sub-channels to a plurality of services, respectively, and that connects one base station to one terminal via one wireless link, thereby establishing communication pertaining to the plurality of services.

Abstract: Improvement in utilization efficiency of traffic channels and voice quality in an OFDMA scheme is accomplished. A base station communicating which mobile stations by an OFDMA scheme using subchannels includes: a channel assigning unit 109a which assigns subchannels for communication to the mobile stations; and a call type acquiring unit 109b which acquires a type of a call as a communication object, wherein the channel assigning unit 109a changes a subchannel assignment procedure for assigning the subchannels to the mobile stations according to the acquired type of the call.

Abstract: There is provided an OFDMA communication system capable of suppressing the communication resource reduction and reducing the processing load on a base station. The system includes a downlink frame generation unit (14) that generates a downlink frame for a downlink period for performing communication to at least one terminal (20) of a plurality of terminals from the base station (10), an uplink frame generation unit (24) that generates an uplink frame for an uplink period for performing communication to the base station (10) from at least one terminal (20) of the plurality of terminals, and a channel allocation unit that allocates, for one terminal of the plurality of terminals, one or more subchannels available in the one terminal, wherein the channel allocation unit allocates, among the subchannels, subchannels having a same time slot and a same frequency band in the downlink frame and in the uplink frame for a single terminal of the plurality of terminals.

Abstract: The present invention provides a memory system which contributes to improvement in efficiency of a data process accompanying a memory access. A memory system has a rewritable nonvolatile memory, a buffer memory, and a controller. The controller controls, in response to an access request from an external apparatus, first data transfer between the controller and the external apparatus, second data transfer between the controller and the nonvolatile memory, and third data transfer between the controller and the buffer memory, controls transfer from the controller to the buffer memory in the third data transfer and transfer from the buffer memory to the controller in a time sharing manner, and enables the first data transfer or the second data transfer to be performed in parallel with the transfer carried out in the time sharing manner.

Abstract: Each mobile station device (12) includes: a subchannel allocation refusal determining section (50), which determines a subchannel refused to be allocated from a base station device (10), based on a communication quality measured for each subchannel by a communication quality measuring section (44); an RMAP creating section (52), which creates refused channel information (RMAP information) indicating the subchannel determined to be refused to be allocated; and a transmitting section (54) which gives notice of the created RMAP information to the base station device (10).

Abstract: In a communication system of the OFDMA communication method, even when transmission data is decreased temporarily and then increased again while communication by a user terminal is in progress, the communication can be continued without lowering the communication throughput of the user terminal and the throughput corresponding to QoS can be provided to the user terminal. The OFDMA communication system for performing data communication using one or more subchannels between a base station (1) and a plurality of terminals includes a communication data amount acquisition unit that acquires a communication data amount and a channel allocation unit that allocates the subchannels according to the communication data amount. When the communication data amount has decreased, the channel allocation unit maintains allocation of at least one of the allocated subchannels.

Abstract: The present invention relates to a wireless communication system for TDMA communication with use of one or more communication channels among at least one of a plurality of cell stations and a wireless communication terminal. The wireless communication terminal includes a link-channel-allocation requesting unit that transmits a link-channel allocation request signal upon handover without specifying a destination cell station, using a handover control channel included in the communication channels which is used for transmitting control information concerning handover and has a unique channel number in the wireless communication system. The one of the cell stations includes a link-channel allocating unit that transmits, to the wireless communication terminal, a link-channel allocation signal including link-channel allocation information using the handover control channel upon receiving the link-channel allocation request signal.

Abstract: There is provided an OFDMA communication system capable of suppressing the communication resource reduction and reducing the processing load on a base station. The system includes a downlink frame generation unit (14) that generates a downlink frame for a downlink period for performing communication to at least one terminal (20) of a plurality of terminals from the base station (10), and an uplink frame generation unit (24) that generates an uplink frame for an uplink period for performing communication to the base station (10) from at least one terminal (20) of the plurality of terminals. The downlink frame and the uplink frame have symmetric configurations.

Abstract: There is provided an OFDMA communication system capable of suppressing the communication resource reduction and reducing the processing load on a base station. The system includes a downlink frame generation unit (14) that generates a downlink frame for a downlink period for performing communication to at least one terminal (20) of a plurality of terminals from the base station (10), an uplink frame generation unit (24) that generates an uplink frame for an uplink period for performing communication to the base station (10) from at least one terminal (20) of the plurality of terminals, and a channel allocation unit that allocates, for one terminal of the plurality of terminals, one or more subchannels available in the one terminal, wherein the channel allocation unit notifies information of the allocated one or more available subchannels to the one terminal only by the downlink frame.

Abstract: Provided is a wireless communication system in which a plurality of channels are shared and one of the channels is adaptively allocated to a wireless communication terminal by a base station. The wireless communication terminal is provided with a channel requesting unit that requests the base station to allocate an individual control channel when a communication request is received from an upper control unit of its own terminal or the base station, and a state control unit that controls the state of its own terminal so that the state transits to an individual control channel connected state in which control information is transmitted/received by wirelessly connecting the individual control channel allocated from the base station. The base station is provided with a channel allocating unit that allocates one of a plurality of traffic channels as the individual control channel to be exclusively used for the wireless communication terminal in response to the request from the wireless communication terminal.

Abstract: A base station device (10) performs communications with multiple mobile station devices (20) by the OFDMA scheme. The base station device (10) includes an intra-frame region specifying unit (16) configured to specify a region in a downlink frame to be specified by at least the sub-channel and a transmitter (13) configured to transmit MAP region information indicating the specified downlink intra-frame region. The intra-frame region specifying unit (16) specifies a region in a frame that is to contain communication data. The base station device (10) further includes a MAP generator (121) configured to generate MAP indicating the specified intra-frame region, and the transmitter (13) transmits a downlink frame containing the generated MAP in all or a part of the downlink intra-frame region specified by the MAP region information.

Abstract: In a communication system of the OFDMA communication method, even when transmission data is decreased temporarily and then increased again while communication by a user terminal is in progress, the communication can be continued without lowering the communication throughput of the user terminal and the throughput corresponding to QoS can be provided to the user terminal. The OFDMA communication system for performing data communication using one or more subchannels between a base station (1) and a plurality of terminals includes a communication data amount acquisition unit that acquires a communication data amount and a channel allocation unit that allocates the subchannels according to the communication data amount. When the communication data amount has decreased, the channel allocation unit maintains allocation of at least one of the allocated subchannels.

Abstract: A mobile station device (12) includes a retransmission request transmission timing identifying unit (40) which identifies, based on a timing of reception of a data frame transmitted from a base station device, a timing of transmission of a retransmission request of the data frame to the base station device. The base station device includes a retransmission data frame selecting unit which selects, based on a timing of reception of the retransmission request transmitted from the mobile station device (12), a data frame to be retransmitted from among a plurality of data frames transmitted to the mobile station device (12), and retransmits a data frame selected by the retransmission data frame selecting unit to the mobile station device (12).

Abstract: The throughput of communication is enhanced in a wireless base station device communicating with each of a plurality of terminal devices according to a modulation scheme selected from a plurality of modulation schemes by using any one channel of a plurality of channels.

Abstract: In a base station device 12 which sequentially stores a part or the whole of packets in physical slots formed for time-division multiplexing to perform radio communications with another communication device, an empty region determination unit 22 compares the maximum storage size of each of the physical slots and the data size of the part or whole of the packet to be stored in the physical slot, and determines whether or not an empty region is formed in the physical slot. When the empty region determination unit 22 determines that an empty region is formed in the physical slot, a packet storage/extraction unit 24 stores a part or the whole of a packet subsequent to the packet, in the empty region.

Abstract: There is provided first storage means (3) for storing digital reception beam data converted from a reception beam formed from an ultrasonic received signal; first control means (2) for controlling reading and writing of data from/in the first storage means; a filter coefficient calculation portion (5) for calculating a filter coefficient based on information on the reception beam, the information including a positional relationship between the reception beam and a transmission beam; and a first spatial filter operation portion (4) for subjecting each of a plurality of the reception beam data including data of beams received in parallel from a single transmission beam to filtering processing for reducing a difference in image quality between adjacent beams based on the filter coefficient. Image data output from the first spatial filter operation portion are converted into scanning of a display monitor (8) so as to display an image on the display monitor.

Abstract: A small ultrasound diagnostic device is provided at a low cost that enables the appropriate control by a single power supply unit so as to give a predetermined transmission power to a driving waveform different for each mode without excess or deficiency and without affecting properties of the driving waveform. The ultrasound diagnostic device includes: an ultrasound generation unit (1) that transmits ultrasound; a waveform generation unit (2) that generates a single pulse or a burst pulse whose duty factor is variable in units of a time that is a period corresponding to a frequency outside a frequency band of the ultrasound generation unit (1) so as to drive the ultrasound generation unit (1); and a single power supply unit (3) that determines an amplitude of a driving waveform generated by the waveform generation unit (2). Thereby, an acoustic power of the transmitted ultrasound can be controlled without making the transmission amplitude variable.

Abstract: A front portion of a seat 2 is connected to a base 6 by a front support link 7 and a first support shaft 8, and a rear portion of the seat 2 is connected to a rocking frame 11 by way of a rear support link 14. The first support shaft 8 is slidably fitted to the base 6. An upper portion of the backrest 3 is attached to an upper portion of a back frame 12. When a person is seated, the seat 2 is moved down and moved back, and a lumber support portion 17a of the backrest 3 is moved forwardly in cooperation with movement of the seat 2. Therefore, even when a person is shallowly seated on a chair, the waist portion of the person can precisely be supported. The cooperatively moving means includes a cooperatively moving link mechanism comprising a first through a fifth cooperatively moving link 43, 46, 48, 21 and 20. The third link 48 can be pivoted to return against an elasticity of a second returning spring 49. Therefore, a person is not hampered from being seated thereon deeply.