Abstract: A wireless communication system includes a base station apparatus and a terminal device. The base station apparatus includes a processor that executes a process including mapping first control information concerning a first frequency band which needs a license to use for wireless communication, mapping second control information concerning a second frequency band which does not need the license to use for the wireless communication, and generating a control channel signal by arranging the first control information and the second control information in areas different from each other; and a transmitter that transmits the control channel signal generated by the processor to the terminal device.

Abstract: At a base station, a table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the table, based on the index value from the base station.

Abstract: A wireless communication system includes: a destination device; a source device configured to support device-to-device (D2D) communication and transmit data to the destination device; and a plurality of terminal devices respectively configured to support the D2D communication. One or more terminal devices among the plurality of terminal devices respectively transmit a discovery signal including parameter information to the source device when the one or more terminal devices are respectively configured to be selectable as a relay station for communication with the source device by the destination device. The source device performs a measurement of the discovery signal that is respectively received from the one or more terminal devices, and selects a terminal device that will relay data to be transmitted from the source device to the destination device from among the one or more terminal devices in accordance with the measurement.

Abstract: A base station includes a controller to execute a process including grouping a plurality of wireless terminals into one or more groups using at least one of phases of signals and location information of each wireless terminal received from the plurality of wireless terminals, and allocating, to wireless terminals belonging to each group, resources to perform coordinated multi-point transmission by the wireless terminals in each group, a transmitter to transmit an identifier of each group and an allocation result of the resources to each wireless terminal, and a receiver to receive data transmitted from the wireless terminals of each group by the coordinated multi-point transmission.

Abstract: A base station includes a storage device to store results of carrier sensing performed respectively on a data transmission side and on a data reception side with respect to a plurality of sub-bands in unlicensed frequencies being the frequencies of which a use is not licensed for data transmission, and a controller to extract sub-bands of the unlicensed frequencies being determined that are in an idle status or have high possibility to be in the idle status by both of the data transmission side and the data reception side in the carrier sensing results as candidates for sub-bands of the unlicensed frequencies to be used for transmitting data by the data transmission side.

Abstract: At a base station, a table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the table, based on the index value from the base station.

Abstract: A communication terminal device includes a determining unit that determines a region size of a control channel in accordance with a PHICH duration value transmitted from a base station device, and an acquiring unit that acquires, on the basis of the region size, data to be sent to the communication terminal device. A base station device includes a first control unit that updates a CFI value at a first interval, a second control unit that updates a PHICH duration value at a second interval, the second interval being greater than the first interval, and a scheduling unit that performs scheduling of, only in a subframe in which the PHICH duration value matches the CFI value, data to be sent to a communication terminal device that is outside an arrival coverage of a signal including the CFI value.

Abstract: A wireless communication system includes a base station apparatus and a terminal device. The base station apparatus includes a processor that executes a process including mapping first control information concerning a first frequency band which needs a license to use for wireless communication, mapping second control information concerning a second frequency band which does not need the license to use for the wireless communication, and generating a control channel signal by arranging the first control information and the second control information in areas different from each other; and a transmitter that transmits the control channel signal generated by the processor to the terminal device.

Abstract: At a base station, a table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the table, based on the index value from the base station.

Abstract: A wireless communication system includes: a plurality of terminal devices respectively configured to support D2D communication; and a base station configured to control the plurality of terminal devices, and provides a wireless communication service using a licensed band. The base station selects a terminal device from the plurality of terminal devices based on information received from the plurality of terminal devices, and transmits a measurement instruction that instructs measurement of a usage state of an unlicensed band to the selected terminal device. The selected terminal device measures a usage state for each sub-band in the unlicensed band according to the measurement instruction, and transmits a measurement result to the base station. The base station determines an available sub-band in the unlicensed band for D2D communication based on the measurement result, and transmits sub-band information that indicates the determined sub-band to a terminal device that performs D2D communication.

Abstract: A wireless communication system includes: a plurality of terminal devices respectively configured to support D2D (Device to Device) communication; and a base station configured to control the plurality of terminal devices. A first terminal device that communicates with a second terminal device via a first D2D link receives identification information of a third terminal device from the third terminal device that communicates with a fourth terminal device via a second D2D link. The first terminal device transmits the identification information of the third terminal device received from the third terminal device to the base station. The base station controls at least one of a resource for the first D2D link and a resource for the second D2D link in such a way that the resource for the first D2D link and the resource for the second D2D link are different from each other.

Abstract: At a base station, a table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the table, based on the index value from the base station.

Abstract: At a base station, a lookup table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the lookup table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a lookup table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the lookup table, based on the index value from the base station.

Abstract: A wireless system includes a plurality of terminals and a wireless base station. Each of the plurality of terminals determines a priority of a local terminal related to transmission of a certain signal according to a certain rule when the certain signal is not received from the wireless base station.

Abstract: At a base station, a lookup table is prepared that for each index value among multiple different index values, associates repetition counts of different channels correlated with each other. The base station acquires reception information indicating a reception state of a wireless signal at a mobile station, determines a repetition count for each channel based on the reception information, and acquires from the lookup table, an index value corresponding to the respective repetition counts for the channels. The base station transmits to the mobile station, a wireless signal that includes the index value to notify the mobile station of the index value. The mobile station has a lookup table that for each index value among different index values, associates repetition counts of different channels correlated with each other and acquires the repetition counts of the channels from the lookup table, based on the index value from the base station.

Abstract: In some embodiments, a terminal-to-terminal network may include one or more terminals each configured to receive a timing reference signal. The one or more terminals may be Base Station further configured to select a timing offset relative to a periodic transmission frame of the terminal-to-terminal network. The timing offset may be associated with a time relative to the periodic transmission frame at which a timing synchronization signal is broadcast. The timing synchronization signal may be based at least in part on the timing reference signal. The one or more terminals may be further configured to select a timing synchronization signal transmission rate. The one or more terminals may be further configured to broadcast the timing synchronization signal at the timing offset and at the timing synchronization signal transmission rate.

Abstract: A communication system includes: a group including a plurality of communication terminals; and a base station. A first communication terminal in the group includes: an estimation unit that estimates path loss between the first communication terminal and the base station; and a transmission unit that transmits information about the estimated path loss to the base station. The base station includes: a reception unit that receives information about the path loss transmitted from the first communication terminal; and a transmission unit that transmits the received information about the path loss to second communication terminals other than the first communication terminal in the group. Each of the second communication terminals includes: a reception unit that receives the information about the path loss transmitted from the base station; and a determination unit that determines transmit power of the second communication terminal based on the received information about the path loss.

Abstract: A communication terminal device includes a determining unit that determines a region size of a control channel in accordance with a PHICH duration value transmitted from a base station device, and an acquiring unit that acquires, on the basis of the region size, data to be sent to the communication terminal device. A base station device includes a first control unit that updates a CFI value at a first interval, a second control unit that updates a PHICH duration value at a second interval, the second interval being greater than the first interval, and a scheduling unit that performs scheduling of, only in a subframe in which the PHICH duration value matches the CFI value, data to be sent to a communication terminal device that is outside an arrival coverage of a signal including the CFI value.

Abstract: A base station classifies at least some of radio communication apparatuses belonging to the same cell into a plurality of groups. The base station assigns to a first group a first signal sequence that is orthogonal to a cyclically shifted version thereof, and assigns to a second group a second signal sequence that is orthogonal to a cyclically shifted version thereof and that is different from the first signal sequence and from the cyclically shifted version of the first signal sequence. The radio communication apparatus belonging to the first group performs spread modulation on data using the first signal sequence or a signal sequence obtained by cyclically shifting the first signal sequence. The radio communication apparatus belonging to the second group performs spread modulation on data using the second signal sequence or a signal sequence obtained by cyclically shifting the second signal sequence.

Abstract: A base station includes a controller to execute a process including grouping a plurality of wireless terminals into one or more groups using at least one of phases of signals and location information of each wireless terminal received from the plurality of wireless terminals, and allocating, to wireless terminals belonging to each group, resources to perform coordinated multi-point transmission by the wireless terminals in each group, a transmitter to transmit an identifier of each group and an allocation result of the resources to each wireless terminal, and a receiver to receive data transmitted from the wireless terminals of each group by the coordinated multi-point transmission.