Kyocera Corporation

Renesas Electronics Corporation

Nec Corporation

Hironobu Tanigawa

Yasuhiro Nakamura

Nobuaki Takamatsu

Tetsuhiro Suzuki

Toru Sahara

Eiji Kariyada

Kaoru Mori

Norikazu Ohshima

Katsumi Suemitsu

Tadahiko Sugibayashi

Takuya Kitamura

Nobuyuki Ishiwata

Kiyokazu Nagahara

Shunsuke Fukami

Masamitsu Nishikido

Shigeto Hattori

Sadahiko Miura

Yasuaki Ozaki

Ryuichi Sawada

Koji Arata

An image processing deviceincludes an image interfacea memoryand a controllerThe image interfaceacquires a captured image. The positions of specific feature points in a world coordinate system and reference positions of the specific feature points are stored in the memoryThe controllerdetects the specific feature points in the captured image. In a case where discrepancy between the position in the captured image and the reference position is found with regard to a predetermined percentage or more of the specific feature points, the controllerrecalculates a calibration parameter.

Image processing device, imager, information processing device, detector, roadside unit, image processing method, and calibration method

The present invention provides a magnetoresistive effect element which performs writing by a novel method. In a state in which a current does not flow in a magnetization free layer MFR, the magnetization free layer MFR has a magnetic wall MWon the side of a magnetization fixed layer MFX. A magnetic wall MWis moved to the magnetic wall MWside by causing current to flow from the formed side of the magnetic wall MW. Thus, an electrical resistance Rbetween a reference layer REF and the magnetization free layer MFR changes from a low state to a high state.

Semiconductor device

A magnetoresistive effect element of the present invention includes: a domain wall motion layer, a spacer layer and a reference layer. The domain wall motion layer is made of ferromagnetic material with perpendicular magnetic anisotropy. The spacer layer is formed on the domain wall motion layer and made of non-magnetic material. The reference layer is formed on the spacer layer and made of ferromagnetic material, magnetization of the reference layer being fixed. The domain wall motion layer includes at least one domain wall, and stores data corresponding to a position of the domain wall. An anisotropy magnetic field of the domain wall motion layer is larger than a value in which the domain wall motion layer can hold the perpendicular magnetic anisotropy, and smaller than an essential value of an anisotropy magnetic field of the ferromagnetic material of the domain wall motion layer.

Magnetoresistive effect element and magnetic random access memory using the same

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.

Communication system, base station, terminal, and communication method

A magnetic memory includes: a magnetization fixed layer having perpendicular magnetic anisotropy, a magnetization direction of the magnetization fixed layer being fixed; an interlayer dielectric; an underlayer formed on upper faces of the magnetization fixed layer and the interlayer dielectric; and a data recording layer formed on an upper face of the underlayer and having perpendicular magnetic anisotropy. The underlayer includes: a first magnetic underlayer; and a non-magnetic underlayer formed on the first magnetic underlayer. The first magnetic underlayer is formed with such a thickness that the first magnetic underlayer does not exhibit in-plane magnetic anisotropy in a portion of the first magnetic underlayer formed on the interlayer dielectric.

Magnetic memory including memory cells incorporating data recording layer with perpendicular magnetic anisotropy film

A mobile station device configured to communicate with a base station device by a time division duplex (TDD) scheme, and to transmit retransmission data to the base station device by an automatic retransmission scheme in response to reception acknowledgement information transmitted from the base station device, the mobile station device including a controller configured to determine a number of frames from a reception of the reception acknowledgement information to a transmission of the retransmission data, based on a position of a reception slot within a reception frame, the reception slot including the reception acknowledgement information.

Communication system, communication device, and data frame retransmission control method

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 () that generates a downlink frame for a downlink period for performing communication to at least one terminal () of a plurality of terminals from the base station (), an uplink frame generation unit () that generates an uplink frame for an uplink period for performing communication to the base station () from at least one terminal () 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.

OFDMA communication system and communication method

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 () that generates a downlink frame for a downlink period for performing communication to at least one terminal () of a plurality of terminals from the base station (), an uplink frame generation unit () that generates an uplink frame for an uplink period for performing communication to the base station () from at least one terminal () 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.

Present invention provides a communication method and a communication system that can provide more detailed communication control, larger transmission capacity, and more flexible resource distribution to users in comparison with a communication method using a conventional frame format. There are provided a downlink frame generatorthat generates a downlink frame for a downlink period in which a cell stationcommunicates with at least one personal station of the plurality of personal stationsin a predetermined frame format, and an uplink frame generatorthat generates an uplink frame for an uplink period in which at least one personal station of the plurality of personal stations communicates with the cell stationin a predetermined frame format, wherein the frame format of the downlink frame includes a MAP field that notifies, in the downlink period, each personal station of information indicating an available or unavailable subchannel for each personal station.

Communication method and communication system

There are provided an OFDMA communication system capable of reducing a time necessary for a handover without releasing a wireless communication with a base station as a handover source to search base stations, a base station and a mobile station used in the communication system, and a base station switching method. In an OFDMA communication system in which data communication is performed between a plurality of base stationsand a plurality of mobile stations, each base stationincludes subchannel assignment setting unit-which sets assignment of subchannels including a first subchannel and a second subchannel for each of the mobile stations, the first subchannel including information indicating usable or unusable subchannels of the respective mobile stations and being assigned to the respective mobile stations, the second subchannel including actually-used data. When a request for switching the first subchannel is received from one of the mobile stations, the second subchannel is collected and assigned to a same slot as the first subchannel assigned to the one of the mobile stations

Communication system, base station and mobile station used in the communication system, and base station switching method

Each mobile station device () includes: a subchannel allocation refusal determining section (), which determines a subchannel refused to be allocated from a base station device (), based on a communication quality measured for each subchannel by a communication quality measuring section (); an RMAP creating section (), which creates refused channel information (RMAP information) indicating the subchannel determined to be refused to be allocated; and a transmitting section () which gives notice of the created RMAP information to the base station device (). The base station device () includes: an RMAP acquiring section (), which acquires the RMAP information noticed from the each mobile station device (); and a subchannel allocating section (), which determines whether to change a subchannel to be allocated to the each mobile station device (), based on the acquired RMAP information and allocated channel information (MAP information) indicating the subchannel allocated to the each mobile station device ().

Mobile communications system, mobile station device, base station device and channel allocation method

A base station device () performs communications with multiple mobile station devices () by the OFDMA scheme. The base station device () includes an intra-frame region specifying unit () configured to specify a region in a downlink frame to be specified by at least the sub-channel and a transmitter () configured to transmit MAP region information indicating the specified downlink intra-frame region. The intra-frame region specifying unit () specifies a region in a frame that is to contain communication data. The base station device () further includes a MAP generator () configured to generate MAP indicating the specified intra-frame region, and the transmitter () 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.

Mobile communication system, base station device, mobile station device, and mobile communication method

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.

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

In a communication system and a communication method using a TDD-OFDMA communication method, inter-carrier interference due to delay dispersion is prevented by suppressing the delay time within a guard interval. In a base station device, based on a pilot symbol included in uplink information transmitted from a terminal devicethrough an assigned channel assigned by a channel assignment response, it is estimated whether a received timing of receiving the uplink information is early or late, the received timing estimation result is recorded in a timing recording unit, and when transmitting downlink information from the base station device, a transmission timing request is added to the downlink information based on content recorded in the timing recording unit and the downlink information is transmitted to the terminal device(Step S), and in the terminal device, the received transmission timing request is recorded in a transmission timing recording unit, and uplink information is transmitted from the terminal deviceto the base station deviceat a timing instructed by a transmission timing request (Step S).

Communication control method, base station device, terminal device, and communication control system using TDD-OFDMA communication method

A base station apparatus which conducts a packet communication with a wireless communication terminal includes: a retransmission request detection unit which detects a retransmission request from the wireless communication terminal; a bandwidth assignment unit which assigns a communication bandwidth applied to the packet communication; a modulation class calculation portion, based on both bandwidth information regarding the bandwidth assigned by the bandwidth assignment unit and a data amount of packets corresponding to the retransmission request, calculates a modulation class applied to a retransmission in order to adjust a number of retransmitted packets to be the same as a number of previously transmitted packets; a modulation class determination unit which determines whether or not the modulation class is lower than a modulation class applied to a previous packet transmission; and a retransmission unit which retransmits packets corresponding to the retransmission request based on the determination result regarding the modulation class.

Growing community of inventors

Kanagawa, Japan

Hironobu Tanigawa