Abstract: An apparatus includes a carrier sense unit configured to perform carrier sense on a signal observed by using a prescribed beam width, and a transmitter configured to transmit a data signal by performing beamforming within the prescribed beam width in a case that the carrier sense is successful by using the prescribed beam width. The carrier sense unit determines success or failure, based on an energy detection threshold. A beam gain of a beam used for the carrier sense is considered for the energy detection threshold.

Abstract: Provided are a radio transmission apparatus, a radio receiving apparatus, a radio communication system, and a communication method that make it possible for the radio transmission apparatus performing OFDMA transmission to highly efficiently determine a radio receiving apparatus that is caused to participate in the OFDMA transmission. The radio transmission apparatus that performs OFDMA transmission with a plurality of radio receiving apparatuses includes a reception unit that has a function of performing carrier sense and a function of receiving a function information response frame including function response information indicating that a function of performing the OFDMA transmission is included, and a transmission unit that has a function of switching whether or not to transmit a frame to at least one of the plurality of radio receiving apparatuses on a basis of the carrier sense.

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: A terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a receiver configured to receive downlink control information and a downlink shared channel; and a signal detection unit configured to demodulate the downlink shared channel (PDSCH) by using the downlink control information, wherein the downlink control information includes information for indicating an antenna port number and the number of code division multiplexing (CDM) groups for a demodulation reference signal (DMRS), each of the CDM groups indicates a DMRS port to be multiplexed by CDM, the PDSCH is demodulated in consideration of a power ratio of the DMRS and the PDSCH, and whether or not to consider powers of the DMRS and the PDSCH, based on the number of the CDM groups, is determined based on the downlink control information.

Abstract: A base station apparatus according to the present invention includes a transmitter configured to transmit a downlink signal by using a first component carrier and a second component carrier, and a receiver configured to receive an uplink signal transmitted by the terminal apparatus by using at least the second component carrier. The transmitter transmits spatial relation information in the uplink signal, the spatial relation information is information indicating a spatial domain transmission filter for transmitting the uplink signal, and the spatial relation information in the second component carrier includes information indicating the first component carrier.

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: 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 systems in an environment where multiple frame formats are multiplexed for use. A base station apparatus according to the present invention includes a transmitter configured to configure at least one frame structure of multiple frame structures in the second frequency band, notify the terminal apparatus of control information relating to the frame structure, and configure a non-transmit period with prescribed length between multiple signal transmit periods of the frame structure.

Abstract: A BSS to which a destination wireless communication apparatus of a physical layer frame belongs is identified, and accuracy of preamble detection is improved by changing a reception operation. A wireless communication apparatus includes a reception unit that detects a frame including information for identifying a BSS, and a control unit that switches between a first operation in a case where the frame is a frame which is associated with a BSS to which the wireless communication apparatus belongs and a second operation in a case where the frame is a frame which is not associated with the BSS to which the wireless communication apparatus belongs. Carrier sensing is not performed in the first operation, and the carrier sensing is performed in the second operation.

Abstract: A decrease in access rate to a wireless medium caused by an exposed terminal apparatus is improved. A wireless communication apparatus of the present invention includes a reception unit that receives a frame indicating start of a medium protection operation, and acquires, from the frame indicating the start of the medium protection operation, BSS identification information for identifying a BSS to which a transmission-source wireless communication apparatus of the frame indicating the start of the medium protection operation belongs, and a transmission unit that determines whether or not to start a transmission operation of a frame addressed to another wireless communication apparatus belonging to a BSS to which the wireless communication apparatus belongs based on the BSS identification information.

Abstract: An apparatus includes: a higher layer processing unit configured to configure multiple channel state information reference signal (CSI-RS) resources and assistance information; a transmitter configured to transmit CSI-RSs by using the multiple CSI-RS resources; and a receiver configured to receive, from the terminal apparatus, information (CRI) indicating one CSI-RS resource of the multiple CSI-RS resources. The assistance information is information for assisting the terminal apparatus in cancelling or suppressing neighbor cell interference, and one or more of the assistance information is configured for the CRI.

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: A communication apparatus according to the present invention is a communication apparatus for transmitting data using multiple frequency channels, the communication apparatus including: a transmitter configured to transmit a radio frame by using the multiple frequency channels; and a carrier sense unit configured to perform carrier sense using at least one of the multiple channels, wherein in a case that the transmitter transmits the radio frame without using the at least one of the multiple channels on which the carrier sense is performed, at least a result of the carrier sense by the carrier sense unit indicates an idle state.

Abstract: A base station apparatus according to the present invention includes a carrier sense unit configured to perform carrier sense for reserving a wireless medium during a prescribed period of time, and a transmitter configured to transmit a synchronization signal, wherein the synchronization signal has a comb-teeth-shaped frequency spectrum, multiple frequency candidates are configured for a frequency at which mapping of the synchronization signal with the comb-teeth-shaped frequency spectrum is to be started, and the frequency at which the mapping of the synchronization signal is to be started is associated with information indicating the base station apparatus, the frequency being selected by the transmitter.

Abstract: A communication apparatus according to the present invention includes: a carrier sense unit configured to perform a carrier sense and reserve a radio medium only during a prescribed period of time; and a transmitter configured to transmit a signal with radio parameters including at least a beam direction in the prescribed period of time, wherein in a case that the transmitter transmits the signal with a plurality of the radio parameters in the prescribed period of time, the carrier sense unit performs the carrier sense, based on the plurality of the radio parameters.

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: Included are a higher layer processing unit configured to configure multiple sounding reference signal (SRS) resources; a receiver configured to receive an SRS by using the multiple SRS resources configured; a measuring unit configured to generate, from the SRS, information (SRI) indicating one of the multiple SRS resources; and a transmitter configured to transmit downlink control information, wherein the downlink control information includes a plurality of the SRIs, and the plurality of the SRIs are associated with at least one layer.

Abstract: A decrease in access rate to a wireless medium caused by an exposed terminal apparatus is improved. A wireless communication apparatus of the present invention includes a reception unit that receives a frame indicating start of a medium protection operation, and acquires, from the frame indicating the start of the medium protection operation, BSS identification information for identifying a BSS to which a transmission-source wireless communication apparatus of the frame indicating the start of the medium protection operation belongs, and a transmission unit that determines whether or not to start a transmission operation of a frame addressed to another wireless communication apparatus belonging to a BSS to which the wireless communication apparatus belongs based on the BSS identification information.

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: Communication opportunities of existing terminal devices are ensured, in a communication system in which terminal devices capable of using a new CCA level and the existing terminal devices using an existing CCA level coexist, on the premise of CSMA/CA. A communication method of a radio transmission device of the present invention includes a step of signaling information indicating a first CCA section and a second CCA section to the radio reception device. A communication method of a radio reception device of the present invention includes a step of performing the carrier sense based on a first CCA level and a second CCA level, and a step of performing the carrier sense based on the first CCA level, in the first CCA section, based on information indicating the first CCA section.

Abstract: An access point transmits information relating to total power or power density of an L-part and a WUR-part to a station. The station transmits information relating to a WUR-part reception capability to the access point. The station causes a counter field to be included in a WU radio frame at the time of performing multicast transmission of a WU radio signal a plurality of times, and configures a value corresponding to the number of transmission times in the counter field.