Provided is a communication apparatus including a communication unit that receives frames including first information from a plurality of other communication apparatuses and transmits first frames including information indicating a first transmission time period to the plurality of other communication apparatuses, a control unit that determines the first transmission time period on the basis of the plurality of pieces of first information, and a processing unit that generates the first frames.

A communication device and a communication signal generation method are provided that perform receiving input data; and processing the input data according to a determined channel to generate a communication frame. The determined channel corresponds to one of a plurality of channels including at least one first channel defined by a first mode and at least one second channel defined by a second mode. A frequency band of the first channel including subcarriers is different from a frequency band of the second channel including subcarriers. A frequency interval of the subcarriers in the first channel is different from a frequency interval of the subcarriers in the second channel. A number of the first channel(s) in the first mode is different from a number of the second channel(s) in the second mode.

To improve throughput and communication quality in radio communication by flexibly controlling UL transmission and DL transmission, a user terminal according to one aspect of the present invention is a user terminal that communicates with a radio base station using a downlink subframe for enabling a first downlink signal to be received, and an uplink subframe for enabling an uplink signal to be transmitted, and is characterized by having a transmission section that transmits an uplink signal using a predetermined radio access scheme in an uplink subframe, a reception section that receives a second downlink signal transmitted using the predetermined radio access scheme in an uplink subframe, and a control section that selects a transmission mode applied to the second downlink signal from a transmission mode applicable to the first downlink signal and a transmission mode applicable to the uplink signal to control reception processing.

A transmitting apparatus includes an analog transmitting unit that performs analog processing on a multiplex signal in which two or more signals are multiplexed and generates a transmission signal, and a signal multiplexing and learning unit that multiplexes the two or more signals with a neural network whose parameters have been adjusted based on the analog characteristics of the analog transmitting unit and constraints on the multiplex signal and generates the multiplex signal.

[Object] To enable a cell appropriate for a terminal device to be selected when beamforming is performed. [Solution] Provided is a device including: an acquisition unit configured to acquire multiple weight sets for beamforming; and a control unit configured to map a reference signal for measurement to radio resources associated with a weight set in advance for each weight set included in the multiple weight sets, and multiply the reference signal by the weight set.

[Object] To enable a cell appropriate for a terminal device to be selected when beamforming is performed. [Solution] Provided is a device including: an acquisition unit configured to acquire multiple weight sets for beamforming; and a control unit configured to map a reference signal for measurement to radio resources associated with a weight set in advance for each weight set included in the multiple weight sets, and multiply the reference signal by the weight set.

When a plurality of the subcarrier spacing values are applied, a reference signal is generated by using a sequence having a sequence length corresponding to a first ratio of a first subcarrier spacing set for transmission data to the maximum settable subcarrier spacing. The sequence of the reference signal is mapped to a frequency resource at mapping intervals in accordance with a second ratio which is the reciprocal of the first ratio, and the transmission data and the reference signal are transmitted.

A user apparatus configured to perform communication with a base station in a mobile communication system that supports carrier aggregation, including: transmission means configured to transmit, to the base station, the number of layers for each of component carriers that form the carrier aggregation as information of downlink MIMO capability; and reception means configured to receive, from the base station, the number of layers that is used for determining a bit width of a rank indicator for each of the component carriers that form the carrier aggregation.

[Object] To provide a communication device capable of considerably improving transmission efficiency of an entire system by realizing flexible design in accordance with various use cases in a communication system in which a base station device and a terminal device communicate with each other. [Solution] Provided is the communication device including: a setting unit configured to share information regarding a region specified in accordance with a predetermined pattern, with another device; and a transmission processing unit configured to broadcast HARQ feedback.

[Object] To provide a communication device capable of considerably improving transmission efficiency of an entire system by realizing flexible design in accordance with various use cases in a communication system in which a base station device and a terminal device communicate with each other. [Solution] Provided is the communication device including: a setting unit configured to share information regarding a region specified in accordance with a predetermined pattern, with another device; and a transmission processing unit configured to broadcast HARQ feedback.