Abstract: A wireless communication system according to an embodiment of the present disclosure is provided with a terminal that acquires predetermined data repeatedly and operates while switching between a first mode and a second mode having lower power consumption than the first mode, and a relay unit that operates while switching between a third mode and a fourth mode having lower power consumption than the third mode. The relay unit transmits a polling signal to the terminal in the third mode within a specific time, transitions to the fourth mode within the specific time after transmitting the polling signal, and transitions to the third mode before the specific time elapses. The terminal operates in the first mode while holding the predetermined data, and transitions to the second mode after transmitting the predetermined data to the relay unit.

Abstract: In order to enable a user to acquire a desired content more quickly by performing a matching process by using search target ID information identifying a search target so as to properly acquire a content regarding the search target and to shorten a time required to complete the matching process, a communication device such as router is configured such that, when receiving an interest form a content-centric network, the communication device performs a search process on contents accumulated therein, aiming to find one or more contents which meet a search criteria set specified by the interest, performs the matching process for verifying whether the content found in the search process matches the search target ID information (face image) to acquire a content regarding the search target, and transmits the acquired content to a communication device of a content request source.

Abstract: A user terminal sends out an interest including text data and an image file for matching to an information centric network. When a server receives the interest from the user terminal, the server separates the image file for matching from the interest and sends out a simple interest that includes the text data and does not include the image file for matching and a complex interest that includes the image file for matching to the information centric network. A camera associates the text data included in the simple interest with the image file for matching included in the complex interest, executes a matching process for verifying whether any of the image files accumulated in the own device matches the image file for matching based on the criteria stipulated in the text data, and transmits a matching result report to the user terminal.

Abstract: In order to track a mobile body in an efficient manner, a server collects passage trail information relating to a mobile body to be tracked from a camera provided in an information-centric network to thereby track the mobile body. Specifically, the server transmits a request message which designates a search area and a search period to the information-centric network, requesting the information-centric network to provide passage trail information relating to the mobile body, the passage trail information being acquired by the camera; receives a response message including the passage trail information; and collects the passage trail information associated with the search area and the search period designated by the request message to thereby generate tracking information.

Abstract: In order to track a mobile body in an efficient manner, a server collects passage trail information relating to a mobile body to be tracked from a camera provided in an information-centric network to thereby track the mobile body. Specifically, the server transmits a request message which designates a search area and a search period to the information-centric network, requesting the information-centric network to provide passage trail information relating to the mobile body, the passage trail information being acquired by the camera; receives a response message including the passage trail information; and collects the passage trail information associated with the search area and the search period designated by the request message to thereby generate tracking information.

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: Channel interference is suppressed, and an increase in the cost of manufacturing a terminal or in maximum transmission power is adaptively suppressed. A base station retains information relating to at least one already-allocated bandwidth, among all bandwidths that are to be used for wireless communication, in a memory and determines whether the already-allocated bandwidth that is the same as a bandwidth which satisfies terminal performance information, according to a request for communication from a terminal, which includes the terminal performance information is present or absent. In a case where the already-allocated bandwidth that is the same as the bandwidth which satisfies the terminal performance information is absent, the base station determines whether a non-allocated bandwidth that is the same as the bandwidth which satisfies the terminal performance information is present or absent.

Abstract: In order to enable a user to acquire a desired content more quickly by performing a matching process by using search target ID information identifying a search target so as to properly acquire a content regarding the search target and to shorten a time required to complete the matching process, a communication device such as router is configured such that, when receiving an interest form a content-centric network, the communication device performs a search process on contents accumulated therein, aiming to find one or more contents which meet a search criteria set specified by the interest, performs the matching process for verifying whether the content found in the search process matches the search target ID information (face image) to acquire a content regarding the search target, and transmits the acquired content to a communication device of a content request source.

Abstract: Observing an observation area wider than a cruising distance of a drone, an acquiring observation data of all observation sections and analyzing all the observation area, even when it is impossible for the operator to go to the observation base due to a failure of a traffic infrastructure and when a failure of a communication infrastructure occurs. The drone flies through the observation section from the observation base, where the drone is on standby, to a next observation base to observe, to transmit all observation data after a first observation section stored in the drone to the next drone on standby at the observation base when the drone lands at the next observation base, and to deliver observation data of all observation sections to the observation base, which is a destination, by sequentially repeating the performance of the transmitting of data between the drones in all observation sections.

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 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: Observing an observation area wider than a cruising distance of a drone, an acquiring observation data of all observation sections and analyzing all the observation area, even when it is impossible for the operator to go to the observation base due to a failure of a traffic infrastructure and when a failure of a communication infrastructure occurs. The drone flies through the observation section from the observation base, where the drone is on standby, to a next observation base to observe, to transmit all observation data after a first observation section stored in the drone to the next drone on standby at the observation base when the drone lands at the next observation base, and to deliver observation data of all observation sections to the observation base, which is a destination, by sequentially repeating the performance of the transmitting of data between the drones in all observation sections.

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 transmitting apparatus, a receiving apparatus and a wireless communication method for suppressing interference between codes, while further reducing the ratio of redundant components occupying a signal to improve the transmission efficiency. The transmitting apparatus (100) transmits a signal having a frame structure in which a plurality of symbols follow a pilot symbol to which a guard interval has been added. In the receiving apparatus (200) that receives that signal, a long FFT target section acquiring part (202) acquires, from the received OFDM signal, a long FFT target section that is a target section in which delay waves are to be removed by use of a pilot symbol. A long FFT part (203) performs a fast Fourier transformation of the long FFT target section to convert it to a frequency domain signal. A frequency equalizing part (204) performs a frequency equalization of the long FFT target section by use of an interpolation result of communication line estimation value.

Abstract: A mobile terminal device for performing multi-carrier communication with a base station device can improve communication quality while reducing the data amount without lowering accuracy of feedback information.

Abstract: A mobile terminal device for performing multi-carrier communication with a base station device can improve communication quality while reducing the data amount without lowering accuracy of feedback information.

Abstract: A modulation apparatus is disclosed that enables significant improvements in signal transmission rate in a limited frequency band as compared with conventional modulation schemes. The modulation apparatus has first and second frequency-increasing single side band (SSB) modulators. The modulators are configured to have respective carrier frequencies with a difference by a frequency corresponding to the symbol frequency (i.e. fundamental frequency of the input symbol). An adder combines a lower side band (LSB) signal obtained from the SSB modulator set for a higher carrier frequency, and an upper side band (USB) signal obtained from the SSB modulator set for a lower carrier frequency to obtain a modulation signal.

Abstract: An assignment section 101 determines communication resource assignment to communication terminals based on a transmission rate at which communication is possible for each subcarrier of each communication terminal, and instructs a buffer section 102 to output forward transmission data. In addition, the assignment section 101 instructs a frame creation section 103 to perform forward transmission data symbolization, and also outputs a signal indicating communication resource assignment to each communication terminal. The buffer section 102 holds forward transmission data, and outputs forward transmission data to the frame creation section 103 in accordance with instructions from the assignment section 101. The frame creation section 103 symbolizes a resource assignment signal and transmission data to create a frame, which it outputs to a spreading section 104.

Abstract: An assignment section 101 determines communication resource assignment to communication terminals based on a transmission rate at which communication is possible for each subcarrier of each communication terminal, and instructs a buffer section 102 to output forward transmission data. In addition, the assignment section 101 instructs a frame creation section 103 to perform forward transmission data symbolization, and also outputs a signal indicating communication resource assignment to each communication terminal. The buffer section 102 holds forward transmission data, and outputs forward transmission data to the frame creation section 103 in accordance with instructions from the assignment section 101. The frame creation section 103 symbolizes a resource assignment signal and transmission data to create a frame, which it outputs to a spreading section 104.