Abstract: To provide, while achieving coexistence with other radio access systems, a base station apparatus, a terminal apparatus, and a communication method capable of achieving high frequency efficiency. A carrier sense unit configured to secure a channel occupancy time by carrier sense, and a transmission unit configured to transmit at least one subframe in the channel occupancy time are included, and the transmission unit, in a case of communicating with the terminal apparatus only in an unlicensed band, transmits a preamble signal being a common signal in a cell by using an OFDM symbol in an anterior part of a first subframe of the at least one subframe.

Abstract: An object is to mitigate interference by using effective knowledge or information as to an interference signal while reducing an increase in the amount of calculation. A terminal device includes a reception unit that receives downlink control information from a base station apparatus. In a case of a prescribed transmission mode, a downlink shared channel destined for the terminal apparatus is demodulated on the basis of a power offset between transmit power of the terminal apparatus and transmit power of another terminal apparatus in the downlink shared channel included in the downlink control information. Whether or not to perform interference cancellation is determined according to a value of the power offset.

Abstract: Communication is efficiently performed even when the communication is performed in a high carrier frequency. A terminal apparatus includes: a reception unit configured to receive assistance information from a primary cell and a plurality of synchronization signals from a secondary cell and to perform synchronization on the basis of the assistance information and the plurality of synchronization signals; and a transmission unit configured to transmit measurement information regarding at least one of the plurality of synchronization signals. The assistance information includes respective pieces of information regarding the plurality of synchronization signals. The assistance information includes an ID of each of the plurality of synchronization signals, and the terminal apparatus transmits the ID as the measurement information regarding the synchronization signal.

Abstract: A method that carries out uplink multiple access while reducing complexity in processing accompanying exchange of control information. A terminal device that performs uplink multiple access communication includes a reception unit that receives a frame including first uplink multiple access information, and a transmission unit that transmits a frame including second uplink multiple access information based on the frame including the first uplink multiple access information, and further, after standby of a predetermined period, initiates the uplink multiple access communication.

Abstract: A coding unit and a radio transmitting unit are included. The coding unit includes a first coding unit, a division unit, and a second coding unit. The first coding unit codes information bits by using first coding. The division unit divides an output from the first coding unit into blocks. The second coding unit performs error correction coding on each of the blocks output by the division unit to generate a coded block. The radio transmitting unit transmits a plurality of the coded blocks at a random transmission timing.

Abstract: Degradation in reception performance due to interference is reduced while suppressing an increase in the amount of control information. There is provided a terminal device including; a higher layer that determines whether or not to apply NAICS; and a reception unit that receives downlink control information, in which, in a case where, with the higher layer, an indication that the NAICS has to be applied is provided, if the downlink control information is detected in a UE-specific search space, signal detection in compliance with the NAICS is performed, and in which, in the case where, with the higher layer, the indication that the NAICS has to be applied is provided, if the downlink control information is received in a common search space, signal detection in compliance with a linear scheme is performed.

Abstract: A radio transmission apparatus selects any one group from a plurality of groups each indicating a combination of a plurality of radio reception apparatuses, notifies at least a plurality of radio reception apparatuses belonging to the selected group of an identification number assigned in advance to the selected group, and allocates transmission data addressed to the radio reception apparatuses belonging to the selected group to each of a plurality of frequency resources based on order of the radio reception apparatuses, which is determined in advance in the selected group.

Abstract: A base station apparatus is capable of adjusting antenna gains in a horizontal direction and a vertical direction of the plurality of antennas included in the base station apparatus, by adjusting a phase and an amplitude of a signal addressed and transmitted to a terminal apparatus, stores a codebook which is shared with the terminal apparatus and describes a plurality of linear filters associated with antenna gains in the horizontal direction and antenna gains in the vertical direction, acquires control information indicating at least one out of a plurality of linear filters described in the codebook, of which notification is sent from the terminal apparatus, performs precoding on the signal addressed to the terminal apparatus, based on the control information and the first codebook, and transmits the signal subjected to the precoding.

Abstract: To provide a base station apparatus, a terminal apparatus, and a communication method for achieving a high frequency efficiency while coexisting with other radio access system under environment where multiple frame formats are multiplexed for use. A base station apparatus according to the present invention comprises a receiver that performs carrier sense on the second frequency band based on a predetermined frame configuration among a plurality of frame configurations to obtain the second frequency band during a predetermined duration, and a transmitter that notifies control information concerning the predetermined frame configuration and transmits a downlink signal to the terminal apparatus during the predetermined duration based on the predetermined frame configuration.

Abstract: A base station apparatus, a terminal apparatus, and a communication method are provided that achieve a radio access network in which beam sweeping is appropriately performed in an environment in which a plurality of frame formats are used in a multiplexed fashion. The terminal apparatus according to the present invention includes an antenna unit configured to have a plurality of beam patterns configurable, a receiver configured to acquire information for indicating at least one of a plurality of frame configurations, and a beam sweeping unit configured to perform beam sweeping based on a prescribed frame configuration in a case that the information for indicating the one of the plurality of frame configurations indicates the prescribed frame configuration.

Abstract: Provided is a base station apparatus, a terminal apparatus, and a communication method, capable of improving communication performance such as throughput and communication efficiency in a system using a plurality of frame formats. A terminal apparatus according to the present invention, includes a reception unit to receive information indicating at least one frame structure out of a plurality of frame structures from the base station apparatus, a control unit to perform a transmit power control associated with the frame structure, and a transmission unit to generate a transmit signal based on the frame structure and the transmit power control and transmit the transmit signal to the base station apparatus.

Abstract: Provided are a base station apparatus, a terminal apparatus, and a communication method that enable the improvement of communication performance in a system in which multiple frame formats are used. A transmitter configured to transmit one or more subframes defined with a given fixed time length is provided, wherein at least one subframe out of the subframes includes a common signal interval which is an interval for transmitting a common signal in a cell, the common signal interval includes a signal generated by a first parameter set, and an interval other than the common signal interval includes a signal generated by the first parameter set or a signal generated by a second parameter set different from the first parameter set at least in terms of a subcarrier spacing.

Abstract: There are provided a base station apparatus, a terminal apparatus, and a communication method which are capable of realizing a LTE-A system with improved throughput by performing a CA technology including an unlicensed band while suppressing interference from an existing system. A base station apparatus according to the present invention, which is included in a communication system that applies a communication scheme applied to a first frequency band capable of being used as a dedicated frequency band to a second frequency band different from the first frequency band and is capable of communicating with a terminal apparatus by using the second frequency band and the second frequency band.

Abstract: In a case that interference is received from the surrounding wireless communication apparatuses, the interference signals are reduced thereby improving a communication efficiency. A guard terminal apparatus is used with an access point wirelessly communicating with a wireless terminal apparatus, outputs a signal to perform medium reservation, and includes a leaky coaxial cable configured to wirelessly transmit a signal for performing the medium reservation. The leaky coaxial cable is arranged in a part of a coverage of the access point. The access point or another guard terminal apparatus used with the access point transmits a signal to shorten a reserved period which is based on a transmitted medium reservation signal.

Abstract: A base station apparatus, a terminal apparatus, and a communication method are provided that achieve a radio access network in which beam sweeping is appropriately performed in an environment in which a plurality of frame formats are used in a multiplexed fashion. The base station apparatus according to the present invention includes an antenna unit for which a plurality of beam patterns is configurable, a frame configuration unit capable of configuring a plurality of frame configurations; and a beam sweeping unit configured to perform beam sweeping based on a prescribed frame configuration in a case that a frame configuration configured by the frame configuration unit is the prescribed frame configuration.

Abstract: Provided are a radio transmission apparatus, a radio reception apparatus, and a communication method capable of realizing a radio LAN system in which user throughput is improved by using OFDMA while suppressing overhead. A radio transmission apparatus of the invention selects any one group from a plurality of groups each indicating a combination of a plurality of radio reception apparatuses, notifies at least a plurality of radio reception apparatuses belonging to the selected group of an identification number assigned in advance to the selected group, and allocates transmission data addressed to the radio reception apparatuses belonging to the selected group to each of a plurality of frequency resources on the basis of order of the radio reception apparatuses, which is determined in advance in the selected group.

Abstract: A base station apparatus according to the present invention is capable of adjusting antenna gains in a horizontal direction and a vertical direction of the plurality of antennas included in the base station apparatus, by adjusting a phase and an amplitude of a signal addressed and transmitted to a terminal apparatus, stores a codebook which is shared with the terminal apparatus and describes a plurality of linear filters associated with antenna gains in the horizontal direction and antenna gains in the vertical direction, acquires control information indicating at least one out of a plurality of linear filters described in the codebook, of which notification is sent from the terminal apparatus, performs precoding on the signal addressed to the terminal apparatus, based on the control information and the first codebook, and transmits the signal subjected to the precoding.

Abstract: Degradation in reception performance due to interference is reduced while suppressing control information from increasing. A higher layer that determines whether or not to apply NAICS and a reception unit that receives Downlink Control Information are included. In a case where, with the higher layer, an indication that the NAICS has to be applied is provided, if a first downlink control information format is received, signal detection in compliance with the NAICS is performed, and, in the case where, with the higher layer, the indication that the NAICS has to be applied is provided, if a second downlink control information format is received, signal detection in compliance with a linear scheme is performed. The first downlink control information format is constituted as at least one downlink control information format that is allocated only to a UE-specific search space.

Abstract: A channel estimation unit estimates channel state information to or from a base station device. A feedback information generation unit performs a decomposition process for the channel state information and thereby acquires first decomposition information that includes plural singular values and second decomposition information that includes plural right singular vectors respectively associated with the plural singular values. The feedback information generation unit mutually replaces portions of the plural singular values, thereby acquires first replacement information, and further acquires second replacement information based on the first replacement information and the plural right singular vectors. The feedback information generation unit performs a conversion process for the second replacement information and thereby acquires second conversion information. A radio transmission unit notifies the base station device of the second conversion information.

Abstract: A terminal apparatus improves throughput while suppressing control information of an interfering signal. The terminal device includes: a higher layer that determines an instruction as to whether to apply NAICS; a receiving unit that receives downlink control information; and a control unit that, in a case where it has been specified on the higher layer that NAICS is applied, determines, on the basis of information that is contained in the downlink control information and indicates whether to perform interference cancellation or suppression, whether to perform interference cancellation or suppression. The receiving unit receives, in a user-specific search space, the downlink control information containing the information indicating whether to perform interference cancellation or suppression.