Abstract: To provide a base station apparatus, a terminal apparatus, and a communication method capable of improving a frequency efficiency or throughput by suppressing an overhead associated with feedback from the terminal apparatus in a case that the base station apparatus acquires highly accurate CSI. A terminal apparatus according to an aspect of the present invention includes a receiver configured to receive at least one NZP CSI-RS, and a transmitter configured to transmit a signal including at least one piece of CSI. The at least one piece of CSI includes at least an RI and a PMI, the receiver acquires a first value for configuring the number of vectors indicated by the PMI, and in a case that a value of the RI exceeds a prescribed value, the number of vectors is configured by a second value being a value equal to or less than the first value.

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: To provide a terminal apparatus and a communication method capable of improving reliability and frequency efficiency in a case of transmission by beamforming. Provided are a higher layer processing unit configured with demodulation reference signal (DMRS) antenna port groups for indicating two groups of antenna ports of a DMRS, a receiver configured to receive the DMRS, downlink control information (DCI), and a downlink shared channel (PDSCH), and a decoding unit configured to decode the PDSCH, wherein the PDSCH includes a transport block, and in a case that the number of the transport blocks configured in the DCI is one, the PDSCH demodulated using a DMRS of a first group and/or the PDSCH demodulated using a DMRS of a second group is used to decode one transport block.

Abstract: In a wireless communication system including a first sub-wireless communication system for managing a first radio resource and a second sub-wireless communication system for managing a second radio resource, a terminal apparatus connected to the first sub-wireless communication system is capable of performing communication using the second radio resource in addition to the first radio resource.

Abstract: Provided is a station apparatus for wirelessly communicating with an access point apparatus through multi-link, the access point apparatus including multiple sub access point units, the station apparatus including multiple sub station units, wherein a sub station unit of the multiple sub station units includes a frame receiver configured to receive a radio frame, a measurement circuitry configured to measure reception quality of the received radio frame, and a frame transmitter configured to transmit the radio frame, and the sub station unit is configured to report information related to the reception quality to the access point apparatus.

Abstract: A radio communication apparatus that simultaneously uses multiple radio channels, the radio communication apparatus includes a radio communicator, and a radio controller, wherein the radio controller uses multiple transmission methods, at least one of the multiple transmission methods is a method for reducing latency, at least one radio channel of the multiple radio channels is allocated to the method for reducing latency, a beacon is transmitted on the multiple radio channels by use of the radio communicator, and information transmitted in the beacon includes an information element indicating the at least one radio channel allocated to the method for reducing latency.

Abstract: According to an aspect of the present invention, in a wireless LAN communication system, a primary channel to be used for uplink frame transmission is configured to be different from a primary channel to be used for downlink frame transmission, so that the frequency efficiency can be improved. In a wireless LAN communication system capable of frame transmission and/or reception using a broadband frequency such as a 320 MHz bandwidth, terminal apparatuses connected to an access point apparatus include terminals that perform power saving operations, legacy terminals, and low-spec terminals, and it is conceivable that a ratio of terminal apparatuses that perform frame transmission and/or reception using the entire bandwidth is not so high particularly in a transition stage.

Abstract: An access point apparatus is an access point apparatus configured to maintain a first connection and a second connection, and includes a receiver configured to receive, in the first connection, a first frame including information associated with the second connection and a transmitter configured to determine, using the first frame, whether to transmit a second frame in the second connection.

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 uplink multiple access connection information, a first autonomous decentralized control unit that instructs securing time of a wireless resource, and a second autonomous decentralized control unit that instructs securing time of a wireless resource after reception of a frame including the uplink multiple access connection information. The terminal device is instructed securing time of the wireless resource by the first autonomous decentralized control unit in a case that a frame including the uplink multiple access connection information is not received. Securing time of the wireless resource is instructed by the second autonomous decentralized control unit in a case that a frame including the uplink multiple access connection information is received.

Abstract: A station apparatus according to the present invention is a station apparatus configured to interpret a physical layer signal, the station apparatus including a signal demodulator configured to decode a physical layer signal and perform error detection, based on either first decoding that performs packet combining in the physical layer or second decoding that does not perform packet combining in the physical layer, a higher layer processor configured to transfer a result of the error detection to a MAC layer, and a transmitter configured to hold at least part of the physical layer signal and transmit a trigger frame that causes another station apparatus to transmit a frame, wherein the trigger frame includes information indicating either the first decoding or the second decoding.

Abstract: An access point apparatus is an access point apparatus that maintains multiple connections, and includes a receiver that performs carrier sensing in the multiple connections and a transmitter that transmits a first frame for reserving a radio medium in a predetermined time interval in the multiple connections based on the carrier sensing, and the first frame includes information indicating a station apparatus having preference for use with respect to each of the multiple connections.

Abstract: A radio communication apparatus includes a receiver configured to receive control information related to multiple connections (a multi-link), and a frame transmitter configured to transmit a frame associated with the multi-link, wherein one or more of the multi-links are configurable, the multi-link includes two or more connections, and the control information includes an identifier for identifying the multi-link.

Abstract: A base station apparatus that communicates with a terminal apparatus includes a transmitter that transmits a radio frame, a receiver that receives a radio frame, a controller that controls transmission and reception of a radio frame, and an evaluator that checks the received radio frame, and the controller transmits, to the terminal apparatus, information to stop a priority right configured for the terminal apparatus.

Abstract: A communication apparatus that maintains a first connection and a second connection, the communication apparatus including a frame generator configured to generate a first frame and a second frame, and a transmitter configured to transmit the first frame based on the first connection and transmit the second frame based on the second connection, wherein a frame length of the first frame and a frame length of the second frame are configured based on destination information of the first frame and destination information of the second frame, respectively.

Abstract: A terminal apparatus that communicates with a base station apparatus or another terminal apparatus includes a transmitter that transmits a radio frame, a receiver that receives a carrier sense and a radio frame, and a controller that controls transmission and reception of a radio frame, and the controller transmits, to the base station apparatus, a radio frame including priority right utilization condition information and information to request a priority right.

Abstract: A station apparatus according to the present invention includes a signal demodulator configured to interpret a first coding scheme and a second coding scheme, a receiver configured to receive a reception frame including a control signal, and a transmitter configured to transmit, based on the control signal, a transmission frame including any one of a first retransmission request signal associated with the first coding scheme or a second retransmission request signal associated with the second coding scheme, wherein the control signal includes first information indicating whether a reception method for changing a carrier sense level is allowed.

Abstract: A base station apparatus includes a downlink reference signal generation unit configured to generate a first demodulation reference signal and a second demodulation reference signal that are reference signals used to demodulate a data signal, and a radio transmitting unit configured to transmit the first demodulation reference signal, the second demodulation reference signal, and control information to the terminal apparatus. The control information includes parameters regarding the first demodulation reference signal and parameters regarding the second demodulation reference signal. The parameters regarding the first demodulation reference signal include an antenna port number. The parameters regarding the second demodulation reference signal include an antenna port number, and a time domain density or a frequency domain density with which demodulation reference signals are mapped into a slot. The first demodulation reference signal is mapped before the second demodulation reference signal in the slot.

Abstract: A station apparatus according to the present invention includes a signal demodulator configured to decode a signal of a physical layer and perform error detection, a higher layer processor configured to transfer a result of decoding the physical layer to a MAC layer and obtain data transferred from the MAC layer, and a transmitter configured to generate a signal of a physical layer, based on the data transferred from the MAC layer, wherein the signal of the physical layer includes a physical header, and the physical header includes information associated with a result of the error detection.

Abstract: A station apparatus according to the present invention includes a physical layer frame generator configured to selectively use a first coding scheme and a second coding scheme, a transmitter configured to transmit a frame including a control signal, and a higher layer processor configured to configure either the first coding scheme or the second coding scheme for information bits included in the frame, based on the control information, wherein the control signal includes first information indicating whether a reception method for changing a carrier sense level is allowed for a communication apparatus that receives the frame.

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.