Abstract: A communication device includes, a controller that executes control to receive a data transmission packet from another communication device, create a reception confirmation packet indicating reception of the data transmission packet, and store the created reception confirmation packet in a transmission buffer, and a transmitter that transmits a part of reception confirmation packets stored in the transmission buffer to the other communication device but does not transmit reception confirmation packets other than the transmitted reception confirmation packet to the other communication device.

Abstract: A communication device includes a receiver , a transmitter that executes first transmission processing and second transmission processing , and a controller that controls the transmitter in accordance with a radio quality of wireless communication so that either the first transmission processing or the second transmission processing is executed.

Abstract: A communication device that supports D2D (Device-to-Device) communication includes a processor configured to determine a sensing section for performing sensing based on a position of a first slot in a candidate selection slot set and information regarding a transmission of an aperiodic traffic, the sensing section being formed by a plurality of consecutive slots in a sensing window, the candidate selection slot set including a slot that is configured to transmit a D2D signal; and a sensing unit configured to perform sensing in the sensing section determined by the processor. The processor determines a resource for transmitting the D2D signal in the candidate selection slot set based on a result of the sensing by the sensing unit.

Abstract: A wireless communications system includes a base station; and a terminal; wherein the base station includes a transmitter configured to transmit to the terminal using a physical downlink control channel, information used for assignment of first candidate and second candidate of a utilization resource in an unlicensed band for transmitting a wireless signal; and a receiver configured to receive the wireless signal from the terminal; and the terminal includes a receiver configured to receive the information; and a transmitter configured to transmit the wireless signal to the base station using the first candidate when the first candidate is idle, or using the second candidate when the first candidate is not idle and the second candidate is idle; and wherein the assignment of the first candidate and the second candidate by the base station is performed by allocating a plurality of subframes.

Abstract: A base station device includes: a memory; and a processor coupled to the memory and configured to execute a first generation processing that includes generating a first control channel to be placed in a sub-frame at a predetermined cycle, the first control channel including designation information indicating at least one sub-frame in the predetermined cycle, execute a second generation processing that includes generating a second control channel to be placed in a sub-frame indicated by the designation information in the first control channel, the second control channel including control information for controlling communication, and execute a transmission processing that includes transmitting a sub-frame in which the first control channel is placed and a sub-frame in which the second control channel is placed.

Abstract: A radio base station includes: a radio communicator configured to perform radio communication; and a first controller that includes a first scheduler configured to perform a first scheduling that is at least a first part of a scheduling for the radio communication; and a second controller that is coupled to the first controller via a network, wherein the second controller comprises a second scheduler configured to perform a second scheduling that is at least a second part of the scheduling for the radio communication.

Abstract: A base station device that communicates with a terminal device in a wireless manner, the base station device includes, a controller configured to determine an accumulation number which is a number of reception confirmation packets that are able to be accumulated in the terminal device and correspond to packets received from the base station device, in accordance with an amount of data transmitted by the terminal device, and a transmitter configured to transmit a control signal including the determined accumulation number to the terminal device.

Abstract: A wireless communications system includes a base station; and a terminal; wherein the base station includes a transmitter configured to transmit to the terminal using a physical downlink control channel, information used for assignment of first candidate and second candidate of a utilization resource in an unlicensed band for transmitting a wireless signal; and a receiver configured to receive the wireless signal from the terminal; and the terminal includes a receiver configured to receive the information; and a transmitter configured to transmit the wireless signal to the base station using the first candidate when the first candidate is idle, or using the second candidate when the first candidate is not idle and the second candidate is idle; and wherein the assignment of the first candidate and the second candidate by the base station is performed by allocating a plurality of subframes.

Abstract: A wireless communications system includes a first communications apparatus configured to use a predetermined band shared with a second wireless communications system and receive a wireless signal from a second communications apparatus; and the second communications apparatus. The first communications apparatus is further configured to assign to the second communications apparatus, a first candidate and a second candidate for a utilization resource in the predetermined band. The second communications apparatus is configured to perform radio resource idle state detection based on a result of assignment of the first candidate and the second candidate. The second communications apparatus is further configured to use the first candidate and transmit the wireless signal to the first communications apparatus when the first candidate is idle, and to use the second candidate and transmit the wireless signal to the first communications apparatus, when the first candidate is not idle and the second candidate is idle.

Abstract: A wireless device is used in a wireless communication system that includes a base station for controlling communication in which a time division duplex frame including at least one uplink subframe and at least one downlink subframe is transmitted. The wireless device includes: a request transmitter that transmits a request for performing D2D (device-to-device) communication to the base station; a receiver that receives position information to indicate a position at which a blank subframe is allocated in the time division duplex frame from the base station; and a scheduler that determines a schedule for D2D communication based on the position information and reports the schedule to a corresponding wireless device. The blank subframe is configured to include a symbol for control signal and a plurality of blank symbols in which no signal is transmitted from the base station.

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 radio base station includes: a radio communicator configured to perform radio communication; and a first controller that includes a first scheduler configured to perform a first scheduling that is at least a first part of a scheduling for the radio communication; and a second controller that is coupled to the first controller via a network, wherein the second controller comprises a second scheduler configured to perform a second scheduling that is at least a second part of the scheduling for the radio communication.

Abstract: A base station device includes: a memory; and a processor coupled to the memory and configured to execute a first generation processing that includes generating a first control channel to be placed in a sub-frame at a predetermined cycle, the first control channel including designation information indicating at least one sub-frame in the predetermined cycle, execute a second generation processing that includes generating a second control channel to be placed in a sub-frame indicated by the designation information in the first control channel, the second control channel including control information for controlling communication, and execute a transmission processing that includes transmitting a sub-frame in which the first control channel is placed and a sub-frame in which the second control channel is placed.

Abstract: A communication device includes, a controller that executes control to receive a data transmission packet from another communication device, create a reception confirmation packet indicating reception of the data transmission packet, and store the created reception confirmation packet in a transmission buffer, and a transmitter that transmits a part of reception confirmation packets stored in the transmission buffer to the other communication device but does not transmit reception confirmation packets other than the transmitted reception confirmation packet to the other communication device.

Abstract: A communication device includes a receiver , a transmitter that executes first transmission processing and second transmission processing , and a controller that controls the transmitter in accordance with a radio quality of wireless communication so that either the first transmission processing or the second transmission processing is executed.

Abstract: A wireless device is used in a wireless communication system that includes a base station for controlling communication in which a time division duplex frame including at least one uplink subframe and at least one downlink subframe is transmitted. The wireless device includes: a request transmitter that transmits a request for performing D2D (device-to-device) communication to the base station; a receiver that receives position information to indicate a position at which a blank subframe is allocated in the time division duplex frame from the base station; and a scheduler that determines a schedule for D2D communication based on the position information and reports the schedule to a corresponding wireless device. The blank subframe is configured to include a symbol for control signal and a plurality of blank symbols in which no signal is transmitted from the base station.

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: 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: A wireless communications system includes a first communications apparatus configured to use a predetermined band shared with a second wireless communications system and receive a wireless signal from a second communications apparatus; and the second communications apparatus. The first communications apparatus is further configured to assign to the second communications apparatus, a first candidate and a second candidate for a utilization resource in the predetermined band. The second communications apparatus is configured to perform radio resource idle state detection based on a result of assignment of the first candidate and the second candidate. The second communications apparatus is further configured to use the first candidate and transmit the wireless signal to the first communications apparatus when the first candidate is idle, and to use the second candidate and transmit the wireless signal to the first communications apparatus, when the first candidate is not idle and the second candidate is idle.

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.