Abstract: In order to enable a driver in driving a vehicle to quickly and assuredly recognize a pedestrian having a collision risk with the vehicle even when it is difficult for the driver to recognize the pedestrian by eyes, such as during night time, an in-vehicle terminal device is configured to: determine a collision risk based on pedestrian position information and vehicle position information; generate turn-on instruction information which, when the pedestrian is determined to have the collision risk with the vehicle, causes an indicator light carried by the pedestrian to be turned on in a prescribed light color; and transmit the turn-on instruction information to a pedestrian terminal device via pedestrian-vehicle communication, and wherein the pedestrian terminal device is configured to: receive the turn-on instruction information transmitted from the in-vehicle terminal device; and turn on the indicator light based on the turn-on instruction information.

Abstract: Pedestrian terminal device that can save power consumption. The pedestrian terminal device carried by a pedestrian is provided with an operation mode selector for selecting one of a principal terminal operation mode wherein a pedestrian-vehicle communication with an in-vehicle terminal device is performed representing other pedestrian terminal devices, and an in-group terminal operation mode wherein a short-range wireless communication of a shorter range and a smaller power output than the pedestrian-vehicle communication is performed with another pedestrian terminal device operating in the principal terminal operation mode.

Abstract: A base station transmits an OFDM signal to a mobile station, using carrier frequencies of a frequency band shared with another system. The base station includes a frequency selector that selects an unused frequency band based on an interference level of the frequency band, selects a carrier frequency for systematic-bit mapping, and selects a carrier frequency for parity-bit mapping, and a turbo coder that performs turbo coding processing on transmission data and outputs a systematic bit and a parity bit. The base station also includes a carrier-mapper that performs systematic-bit mapping and parity-bit mapping, and a control-signal generator that generates a control signal containing band-division-count information and signal-type information. The base station further includes an orthogonal frequency division multiplexer that generates the OFDM signal and a transmitter that transmits the OFDM signal to the mobile station.

Abstract: An object is to suppress a decrease in communication quality and improve the communication quality even when interference is present in some of a frequency band in use in a case where a turbo coding scheme is combined with multicarrier communication using some of a frequency band shared with another system. A frequency selector (107) selects a band not used by another system, based on a measurement value of a reception level, then selects a subband for systematic-bit mapping from among subbands having a measurement value of the reception level lower than a threshold, and selects a subband for parity-bit mapping from among subbands other than the subband for systematic-bit mapping, for each subband (carrier frequency) of the selected band. A carrier-mapper (110) maps a systematic bit and parity bit to each subband based on the result of selection by the frequency selector (107).

Abstract: A base station is provided that performs time-division duplex radio communication with a terminal, using part of a frequency band shared with another system. The base station includes a receiver that receives an uplink signal from the terminal for each frequency band in use, and a guard-time-length setter that sets a length of a guard time. The base station also includes a reception level measurer, which measures a reception level of the uplink signal and a reception level of the guard time having a predetermined length, and a frequency band selector, which selects a frequency band in which the reception level of the guard time is not greater than a first threshold. The base station further includes a control signal generator that generates a control signal, and a transmitter that transmits a downlink signal, including the control signal, to the terminal for the frequency band in use.

Abstract: An OFDM signal transmission apparatus is provided, which includes a mapping unit configured to map first signals into N subcarriers and second signals into M subcarrier(s) to form an OFDM signal, wherein N is larger than M. The first signals are each indicating a same bit of retransmission information and the second signals are each indicating a same bit of information other than retransmission information. The OFDM signal transmission apparatus further includes a transmitting unit configured to transmit the formed OFDM signal.

Abstract: The base station performs radio communication of a time-division-duplex scheme with a terminal apparatus, using any of a plurality of channels included in each of a plurality of frequency bands, and includes: a channel selector that selects a plurality of use channels to be used for the radio communication; a transmitter that transmits a downlink signal to the terminal apparatus; and a receiver that receives an uplink signal from the terminal apparatus. The transmitter transmits, using at least one of the plurality of use channels, the downlink signal in a transmission interval of the downlink signal, and the receiver receives the uplink signal in the transmission interval of the downlink signal, using another one of the plurality of use channels that is not adjacent to the at least one of the use channels.

Abstract: A terminal apparatus, a radio communication system and a communication method are provided each capable of transmitting feedback information indicating a reception result of a DL signal to a base station without reducing the efficiency of transmitting a UL signal. The terminal apparatus includes an error detector that detects the presence or absence of an error in a downlink signal transmitted from the base station apparatus, a configurator that configures a different preamble depending on whether or not there is an error in the downlink signal and a transmitter that transmits an uplink signal including the configured preamble.

Abstract: A controller is provided that controls a plurality of base stations, each configured to communicate with a mobile station, using some carrier frequencies of a frequency band shared with another system. The controller includes a receiver that receives first frequency information from a first base station in communication with the mobile station, and second frequency information from a second base station, the second base station being a handover destination. The controller also includes a frequency selector that selects a carrier frequency for systematic-bit mapping and a carrier frequency for parity-bit mapping based on the first frequency information and the second frequency information.

Abstract: Even in a crowded situation in which multiple pedestrians and vehicles gather, it possible to sufficiently suppress pedestrian-vehicle communication between a pedestrian terminal device and a vehicle-mounted terminal device, and to reduce communication congestion due to an increase in traffic in pedestrian-vehicle communication.

Abstract: In MIMO communication, a communication device is provided that transmits a transfer rate request signal while reducing it and reducing the interference and power consumption when the transfer rate request signal is transmitted substantially without lowering the transmission efficiency. A modulation encoding unit encodes and modulates transmission data transmitted to a communication partner and the transfer rate request signal is the plurality of transmission antennas. A transmission unit and a transmission antenna transmit a signal from the modulation encoding unit. A transmission control unit controls transmission of a signal transmitted from the transmission antenna and transmits a transfer rate request signal of one transmission antenna via the transmission antenna according to a comparison result between a difference of the transfer rate request signal in the respective transmission antenna of the communication partner and a predetermined value.

Abstract: Pedestrian terminal device that can save power consumption. The pedestrian terminal device carried by a pedestrian is provided with an operation mode selector for selecting one of a principal terminal operation mode wherein a pedestrian-vehicle communication with an in-vehicle terminal device is performed representing other pedestrian terminal devices, and an in-group terminal operation mode wherein a short-range wireless communication of a shorter range and a smaller power output than the pedestrian-vehicle communication is performed with another pedestrian terminal device operating in the principal terminal operation mode.

Abstract: A terminal apparatus, a radio communication system and a communication method are provided each capable of transmitting feedback information indicating a reception result of a DL signal to a base station without reducing the efficiency of transmitting a UL signal. The terminal apparatus includes an error detector that detects the presence or absence of an error in a downlink signal transmitted from the base station apparatus, a configurator that configures a different preamble depending on whether or not there is an error in the downlink signal and a transmitter that transmits an uplink signal including the configured preamble.

Abstract: An OFDM signal transmission apparatus is provided, which includes a mapping unit configured to map first signals into N subcarriers and second signals into M subcarrier(s) to form an OFDM signal, wherein N is larger than M. The first signals are each indicating a same bit of retransmission information and the second signals are each indicating a same bit of information other than retransmission information. The OFDM signal transmission apparatus further includes a transmitting unit configured to transmit the formed OFDM signal.

Abstract: The present invention aims to perform sensing of a frequency with high accuracy by securing a sufficient amount of time to measure a reception level of a guard time while avoiding a decrease in transmission rate as much as possible even when the distance between a terminal and a base station is short. To this end, a base station is disclosed which is configured to set a guard time based on the measured reception level of a UL signal during a period other than a period when it is time to measure an interference amount. Meanwhile, the base station sets a guard time so as to secure a predetermined length required for measurement of a reception level when it is time to measure the interference amount.

Abstract: A base station is provided that performs time-division duplex radio communication with a terminal, using part of a frequency band shared with another system. The base station includes a receiver that receives an uplink signal from the terminal for each frequency band in use, and a guard-time-length setter that sets a length of a guard time. The base station also includes a reception level measurer, which measures a reception level of the uplink signal and a reception level of the guard time having a predetermined length, and a frequency band selector, which selects a frequency band in which the reception level of the guard time is not greater than a first threshold. The base station further includes a control signal generator that generates a control signal, and a transmitter that transmits a downlink signal, including the control signal, to the terminal for the frequency band in use.

Abstract: An OFDM signal transmission apparatus is provided, which includes a mapping unit configured to map first signals into N subcarriers and second signals into M subcarrier(s) to form an OFDM signal, wherein N is larger than M. The first signals are each indicating a same bit of retransmission information and the second signals are each indicating a same bit of information other than retransmission information. The OFDM signal transmission apparatus further includes a transmitting unit configured to transmit the formed OFDM signal.

Abstract: An ink ribbon includes a core and a mounting section. The core is configured to be wound with an ink ribbon tape. The mounting section is mounted with an identification information recording part in which identification information of the ink ribbon tape is recorded to be inputtable and outputtable. The mounting section includes at least one hole section which supports at least one end portion of the core to be rotatable. The mounting section covers at least a part of the core via the ink ribbon tape wound around the core in a state where the core is rotatable.

Abstract: In MIMO communication, a communication device is provided that transmits a transfer rate request signal while reducing it and reducing the interference and power consumption when the transfer rate request signal is transmitted substantially without lowering the transmission efficiency. A modulation encoding unit encodes and modulates transmission data transmitted to a communication partner and the transfer rate request signal is the plurality of transmission antennas. A transmission unit and a transmission antenna transmit a signal from the modulation encoding unit. A transmission control unit controls transmission of a signal transmitted from the transmission antenna and transmits a transfer rate request signal of one transmission antenna via the transmission antenna according to a comparison result between a difference of the transfer rate request signal in the respective transmission antenna of the communication partner and a predetermined value.

Abstract: In MIMO communication, a communication device is provided that transmits a transfer rate request signal while reducing it and reducing the interference and power consumption when the transfer rate request signal is transmitted substantially without lowering the transmission efficiency. A modulation encoding unit encodes and modulates transmission data transmitted to a communication partner and the transfer rate request signal is the plurality of transmission antennas. A transmission unit and a transmission antenna transmit a signal from the modulation encoding unit. A transmission control unit controls transmission of a signal transmitted from the transmission antenna and transmits a transfer rate request signal of one transmission antenna via the transmission antenna according to a comparison result between a difference of the transfer rate request signal in the respective transmission antenna of the communication partner and a predetermined value.