Abstract: A wireless communication system includes: a base station configured to set a first radio resource which is used for transfer of a first data signal, and a second radio resource of which at least a portion overlaps the first radio resource, the second radio resource having a likelihood of being used for transfer of a second data signal, to be in a radio frame format; a first terminal configured to transmit the second data signal to a destination that is the base station, using the second radio resource; and a second terminal configured to, when it is detected that a portion of the first radio source that is allocated from the base station, which overlaps the second radio resource, is used for the transmission of the second data signal, does not perform transmission of the first data signal, which uses the overlapping portion.

Abstract: A terminal apparatus includes a receiver configured to receive a radio signal; processor circuitry configured to generate a response signal to respond to the received radio signal; and a transmitter configured to transmit a plurality of types of signals including the generated response signal, wherein a size of a radio resource to be used for transmitting the generated response signal is changed when the plurality of types of signals including the generated response signal are transmitted on one physical uplink control channel (PUCCH) resource.

Abstract: A base station apparatus includes: a memory; and processor circuitry coupled to the memory, wherein the processor circuitry is configured to: execute notification processing that includes transmitting a notification signal of a first information associated with a reliability of data transmission, execute transmission processing that includes transmitting a reference signal in two or more frequency bands, and execute reception processing that includes receiving a measurement report that includes a channel quality information of the frequency bands, the channel quality information being derived in accordance with the reliability of the data transmission associated with the first information.

Abstract: A base station that switches between uplink periods and downlink periods in a time division manner and performs communication, the base station includes a memory; processor circuitry coupled to the memory, wherein the processor circuitry is configured to: notify of allocation information indicating a combination of resources for time division duplex (TDD) uplink (UL) or downlink (DL) configuration at a predetermined interval; and generate control information indicating cancelation of transmission of a downlink signal, wherein the canceled transmission is configured to be performed by using one of the resources designated by the allocation information, and wherein the processor circuitry is further configured to transmit the generated control information.

Abstract: A wireless communication system includes: a base station; a relay node; and a wireless equipment configured to receive a downlink signal from the base station without the relay node being involved and to transmit an uplink signal to the base station via the relay node, wherein the base station is configured to control a timing at which the wireless equipment transmits the uplink signal, with the downlink signal, using information relating to first timing advance between the base station and the relay node.

Abstract: A communication system for which a first time period and a second time period different from the first time period are set in each of predetermined time intervals, includes: a base station; a first terminal configured to execute radio transmission between the first terminal and the base station in either one of an uplink and a downlink during the first time period and radio transmission between the first terminal and the base station in the other one of the uplink and the downlink in a direction opposite to the first time period during the second time period; and a second terminal configured to execute radio transmission between the second terminal and the base station in a link in the same direction as the first terminal during the first time period and does not execute radio transmission between the second terminal and the base station during the second time periods.

Abstract: A communication device supports a D2D (Device-to-Device) communication and includes a storage, a scheduler and a transmitter. The storage stores a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data. The scheduler selects a first resource for transmitting control information from the first resource pool and selects a second resource for transmitting data from the second resource pool. The transmitter transmits the control information by using the first resource and transmit the data by using the second resource. The scheduler selects the second resource from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool.

Abstract: A terminal device includes a processor and a memory connected to the processor, wherein the processor executes a process including: receiving a resource specifying signal that specifies a random access resource used to transmit a preamble for random access; selecting one preamble from a plurality of preamble candidates previously acquired; and transmitting the selected preamble by using a random access resource arranged in timing based on a reception timing of the resource specifying signal.

Abstract: A communications method includes transmitting by a radio apparatus, where the radio apparatus transmits to a control apparatus, first information indicating a wireless scheme that the radio apparatus can use in any one among wireless communication and wireless broadcasting; extracting and transmitting by the control apparatus, where the control apparatus extracts from frequency information correlating wireless schemes and available frequencies, a frequency that corresponds to the wireless scheme indicated by the first information transmitted by the radio apparatus and transmits to the radio apparatus, second information indicating the extracted frequency; and performing by the radio apparatus, any one among the wireless communication and the wireless broadcasting, using the frequency indicated by the second information transmitted by the control apparatus.

Abstract: A base station performs wireless communication with a terminal using a first frequency band which needs a license to use for wireless communication and a second frequency band which does not need the license to use for the wireless communication. The base station includes: a generator that generates a request signal for requesting data transmission of the terminal in the second frequency band and specifying a first transmission timing of the terminal; and a transmitter that transmits the request signal to the terminal, wherein the request signal includes information specifying a second transmission timing, which is a next transmission timing when the terminal does not perform data transmission at the first transmission timing and is specified by an offset from a reference timing.

Abstract: A wireless communications system includes a first wireless apparatus and a second wireless apparatus. The first wireless apparatus transmits a paging message that includes information indicating a plurality of cells. The paging message causes the second wireless apparatus to transition from an idle state to a connected state. The second wireless apparatus perform processing of connecting to a cell selected based on the information included in the paging message transmitted from the first wireless apparatus.

Abstract: The frequency notifying device includes: a processor configured to store usable frequencies containing a restricted frequency being restricted in use thereof by radio equipment in a predetermined communication area and a frequency not being restricted in use thereof by the radio equipment in the communication area; and notify the radio equipment, in the communication area, of a signal for requesting the radio equipment to check whether the restricted frequency is usable or not before performing a communication using the restricted frequency when notifying the radio equipment of the usable frequency.

Abstract: A communications apparatus includes a processor configured to identify positions where wireless communication with a mobile communications apparatus is possible, the positions being included in a coverage area of the communications apparatus; and obtain from a database that is inaccessible to the mobile communications apparatus, frequency information that indicates frequencies that can be used for the wireless communication at the identified positions; and an announcing unit configured to announce in the coverage area and by a radio signal, correspondence information that is based on the frequency information obtained by the obtaining unit and that correlates the positions and the frequencies that can be used.

Abstract: A terminal apparatus includes a downlink transceiver that receives downlink data via a base station governing a first cell and exchanges with the base station governing the first cell, control information that is for receiving the downlink data; and an uplink transceiver that transmits uplink data via a base station governing a second cell that is different from the first cell and exchanges with the base station governing the second cell, control information that is for transmitting the uplink data.

Abstract: A wireless communications system configured to use a predetermined bandwidth of a Unlicensed bandwidth, includes a base station; and one or more terminals connected to the base station. The one or more terminals calculate a transmission start timing according to a control signal from the base station, perform a process of detecting a wireless signal of the predetermined bandwidth before the transmission start timing, and when a state in which no wireless signal of the predetermined bandwidth is detected has elapsed for a predetermined period, the one or more terminals start transmission from the calculated transmission start timing.

Abstract: A wireless communication method for transmitting data signals of first and second users using first and second subcarrier groups, respectively, and transmitting pilot signals of the first and second users by multiplexing the pilot signals to the data signals, including allocating the pilot signals of the first and second users to different frequencies, where each of the pilot signals is generated based on Zadoff-Chu sequence; and mapping subcarrier components of the pilot signals so that one or more subcarrier components of higher frequencies and one or more subcarrier components of lower frequencies in the transmission band become identical, in regard to the pilot signals of each of the first and second users.

Abstract: An information processing apparatus that manages information of a first frequency band allocated to a first communication system includes: a reception unit that receives, from a second communication system different from the first communication system, capability information indicating sensing capability of sensing a wireless signal by a communication apparatus of the second communication system; and a transmission unit that transmits, to the communication apparatus of the second communication system, information related to a sensing method for sensing a wireless signal transmitted from a communication apparatus of the first communication system in a second frequency band included in the first frequency band, based on the information of the first frequency band and the capability information of the communication apparatus of the second communication system.

Abstract: A wireless communication device is in a communication system that includes a first wireless system employing a first communication method in which communication is started when a sensed power value is smaller than a first set value of a threshold, and includes a second wireless system employing a second communication method in which communication is performed by scheduling performed by a base station. The wireless communication device employs the first communication method. The wireless communication device includes: a processor that executes a process including: determining presence or absence of interference from the second wireless system based on information received from a different wireless communication device employing the first communication method; and changing the threshold to a second set value when it is determined that there is the interference.

Abstract: A user terminal in a radio communication system, in which each of user terminals performs multiplexing of a data signal and a pilot signal and transmits the multiplexed signal to a base station using different data transmission band frequencies that are assigned by the base station, the user terminal includes a receiving unit that receives uplink resource information from a base station; and a pilot generation unit that generates a Zadoff-Chu sequence, to which a cyclic shift is applied, as a pilot signal based on the uplink resource information; and a transmitting unit that transmits the pilot signal generated by the pilot generation unit to the base station; wherein the pilot generation unit includes a subcarrier mapping unit that performs subcarrier mapping by copying a part of the Zadoff-Chu sequence and adding the copy to the Zadoff-Chu sequence in a frequency domain.

Abstract: A wireless communication method including: acquiring, by a wireless terminal configured to asynchronously transmit a wireless signal to a first base station in a first wireless communication system, first information relating to a stop period during which a synchronous wireless communication between two apparatus is stopped in a second wireless communication system that is interfered by the wireless signal asynchronously transmitted from the wireless terminal, and adjusting, by the wireless terminal, a timing of transmitting the wireless signal so as to suppress an overflow of the wireless signal into a period subsequent to the stop period, based on the first information.