Abstract: A terminal device communicating with a base station device includes a reception unit which performs first measurement based on a first RS and performs second measurement based on a second RS; and a higher layer processing unit which reports a first measurement result obtained by the first measurement and a second measurement result obtained by the second measurement to the base station device. The first measurement is performed in a first state. The first measurement or the second measurement is performed in a second state.

Abstract: There are provided terminal devices (1A to 1C) capable of efficiently performing communication in a communication system in which a base station device (3) and the terminal devices (1A to 1C) communicate with each other. The terminal devices (1A to 1C) that communicate with the base station device (3) include a reception unit that receives notification of a cell state of the base station device (3), a channel state information generation unit that generates channel state information based on channel measurement acquired based on a channel state information reference signal and interference measurement acquired based on a channel state information interference measurement resource, and a transmission unit that transmits the channel state information. The channel state information generation unit performs the channel measurement or the interference measurement based on a subframe in consideration of the cell state.

Abstract: A terminal communicating with a base station by using FDD cells and TDD cells includes a reception unit that performs reception over a PDCCH transmitted using a DCI format. In a case where a primary cell is configured as the TDD cell for the terminal, DAI indicating the accumulated number of PDCCHs or EPDCCHs indicating releasing of downlink semi-persistent scheduling or transmission of a PDSCH in subframes until a current subframe of prescribed subframes is received while being included in the DCI format. A transmit power of a PUCCH transmitted while including HARQ-ACK corresponding to the PDCCH or the EPDCCH indicating the releasing of the downlink semi-persistent scheduling or the transmission of the PDSCH is determined based on a value of the DAI.

Abstract: Uplink communication is efficiently performed in non-allocated frequencies. The terminal apparatus includes: a reception unit configured to receive downlink control information on a PDCCH; and a transmission unit configured to transmit a random access preamble. For a first frame structure type, the downlink control information is used to configure a subframe number of a first uplink subframe in which transmission of the random access preamble is allowed. For a second frame structure type, the downlink control information is used to configure a subframe number of a second uplink subframe in which transmission of the random access preamble is allowed and a symbol number of an uplink symbol in the second uplink subframe.

Abstract: There is provided a terminal device capable of efficiently performing communication in a communication system in which the terminal device and a base station device communicate with each other. The terminal device that communicates with the base station device by using a plurality of aggregated cells includes a reception unit that monitors a first CSS and/or USS in a certain serving cell, and monitors a second CSS and/or USS in the certain serving cell. The reception unit monitors the first CSS and USS in a case where the certain serving cell is a primary cell, and monitors the second CSS and USS in a case where the certain serving cell is a secondary cell and has at least one function of the primary cell.

Abstract: Provided is a terminal configured to communicate with a base station with an FDD cell and a TDD cell. The terminal includes a reception unit configured to perform reception on a PDCCH transmitted in a DCI format. When a TDD cell is configured as a primary cell for the terminal, a first uplink reference UL-DL configuration used for determination of the interval between the reception of the PDCCH indicating a PUSCH transmission and the PUSCH transmission is configured for the TDD cell, and a second uplink reference UL-DL configuration used for determination of whether to use a DAI included in the DCI format of the PDCCH indicating the PUSCH transmission is configured in the FDD cell.

Abstract: A terminal device and a base station device efficiently communicate with each other. For the terminal device, in a case that third information is configured, a third maximum number of layers assumed for determining a bit width for a first RI and a fourth maximum number of layers assumed for determining a bit width for a second RI are provided, based on the third information. In a case that third information is not configured, (i) the third maximum number is provided, based on the smallest of a first number and a second number, and (ii) the fourth maximum number is provided, based on a smallest one of the first number and a third number. The first number is a second maximum number of the layers indicated by second information, the second number is a largest one of the number of antenna ports of a plurality of first CSI-RS resources, and the third number is a largest one of the number of antenna ports of a plurality of second CSI-RS resources.

Abstract: A terminal device transmits an RI determined by the terminal device, the RI corresponding to PDSCH transmission and corresponding to the number of layers, transmits capability information including first information, second information, third information, and/or fourth information, and receives fifth information, wherein the first information indicates a UE category corresponding to a first maximum number of the layers, the second information indicates a first bandwidth class, the third information indicates a second maximum number of the layers, the fourth information indicates a third maximum number of the layers, the fifth information indicates a fourth maximum number of the layers, and a fifth maximum number of the layers assumed for determining a bit width for the RI is given by referring to any one of the first maximum number of the layers, the second maximum number of the layers, and the fourth maximum number of the layers.

Abstract: It is possible to efficiently transmit and receive signals including control information between a base station apparatus and a mobile station apparatus. A control channel is constituted of one or more first elements. The mobile station apparatus sets a search space for performing decoding detection of the control channel within a control channel region in which each of the first elements is constituted of resources in one physical resource block, and a search space for performing decoding detection of the control channel within a control channel region in which each of the first elements is constituted of second elements in a plurality of different physical resource blocks. Each of the second elements is resources obtained by dividing one physical resource block. The mobile station apparatus performs decoding detection of the control channel using the first elements in the set search spaces.

Abstract: There is provided a terminal device which includes a transmission unit that transmits HARQ response information to a first serving cell and a second serving cell on a physical uplink shared channel in a subframe n. The physical uplink shared channel is transmitted based on a physical downlink control channel or an enhanced physical downlink control channel which is detected in a state of including a downlink control information format 0/4. Two or more serving cells are configured in the terminal device, in a case where frame constitution types of any two configured serving cells are different from each other, and in a case where a primary cell has Frame constitution type 2, BcDL is applied to the first serving cell of Frame constitution type 2 by using the following expression (1), and is applied to the second serving cell of Frame constitution type 1 by using the following expression (2). [Math. 1] BcDL=min(WDAIUL,Mc)??Expression (1) [Math.

Abstract: There are provided a base station, a terminal, and a communication system in a wireless communication system in which a base station and a terminal communicate with each other, in which the base station and the terminal can efficiently perform communication. The communication system includes a higher layer processing unit 605 configured to configure, at the base station, for each terminal, a first reference signal configuration for configuring a measurement target for channel state reporting, configured to configure, at the base station, for each terminal, a second reference signal configuration specifying a resource element to be excluded from the target of data demodulation in a case where the terminal demodulates data, and configured to configure, at the base station, for each terminal, a third reference signal configuration for configuring a measurement target for which a reference signal received power is to be measured by the terminal.

Abstract: The present invention enables efficient transmission/reception of a signal including control information between a base station apparatus and a mobile station apparatus. To realize this, second elements are formed using resources that are obtained by dividing one physical resource block pair, each of first elements is constituted by one or more of the second elements, a control channel is constituted by an aggregation of one or more of the first elements, and there is provided a controller that associates any one of the first elements with one or a plurality of the second elements.

Abstract: There is provided a terminal for performing OFDM (Orthogonal Frequency-Division Multiplexing) communication with a base station forming a cell. The terminal includes a control channel processing unit configured to monitor, in a sub-frame, a first control channel in a cell-specific search space that is a search space common within the cell, and a first control channel in a UE-specific search space that is a search space specific to the terminal. In a case where monitoring of a second control channel different from the first control channel that is in the cell-specific search space or the UE-specific search space is configured, the control channel processing unit monitors, in a sub-frame, at least both the first control channel in the cell-specific search space and the second control channel in the UE-specific search space.

Abstract: A terminal device and a base station device efficiently communicate with each other. For the terminal device, in a case that third information is configured, a third maximum number of the layers assumed for determining a bit width for a first RI and a fourth maximum number of the layers assumed for determining a bit width for a second RI are provided, based on the third information. In case that the third information is not configured, the third maximum number and the fourth maximum number are provided, based on a smallest one of a first number and a second number. The first number is a second maximum number of the layers indicated by second information, and the second number is a largest one of the number of antenna ports of a first CSI-RS resource and the number of antenna ports of a second CSI-RS resource.

Abstract: A terminal device includes a reception unit which performs first measurement when a predetermined cell is in a first state and second measurement when the predetermined cell is in a second state, and a higher layer processing unit which reports the first measurement or the second measurement to a base station device. Based on information indicating the first state/the second state of the predetermined cell, the first measurement and the second measurement are switched.

Abstract: A method by a user equipment (UE) is described. The method includes receiving a first physical signal, determining a first physical structure based on information in the first physical signal, and determining resource elements based on the first physical structure. A first set of subcarriers with first subcarrier spacing which is integer multiple or integer sub-multiple of second subcarrier spacing are mapped such that in addition to a slot boundary one or more of starting positions or ending positions of first subcarriers with the first subcarrier spacing in a first set of OFDM symbols are aligned with one or more of starting positions or ending positions of second subcarriers with the second subcarrier spacing in a second set of OFDM symbols.

Abstract: Different precoding processes are used among different regions. A transmit processor uses resources in a region to transmit the control channel and the reference signal. A mobile station device includes a controller that sets a region on the basis of announced information from the base station device, a propagation channel estimator that averages propagation channel variation estimation values from a plurality of reference signals within the region, and a control channel detector that uses the averaged propagation channel estimation values to detect the control channel that includes control information addressed to the mobile station device.

Abstract: There is provided a terminal device which communicates with a base station apparatus. The terminal device includes a reception unit that decodes a downlink control channel (PDCCH) or an enhanced downlink control channel (EPDCCH) including a downlink control information (DCI) format. A field of a downlink assignment index (DAI) is provided in the DCI format for a TDD operation, in a case of a time division duplex (TDD) primary cell. The field of the DAI is not provided in the DCI format for the TDD operation, in a case of a frequency division duplex (FDD) primary cell.

Abstract: A base station device and a terminal device efficiently communicate with each other by using a PDSCH. The base station device and the terminal device determine a starting position of an OFDM symbol for a PDSCH in a serving cell based on a transmission mode relating to transmission of the PDSCH, a DCI format that is used for allocation of the PDSCH, an antenna port that is used for the transmission of the PDSCH, and a higher-layer parameter that is determined from a parameter set for a serving cell in which the PDSCH is received.

Abstract: In a user equipment, in a case where an index for an uplink-downlink configuration is configured for any of activated serving cells included in the plurality of cells, configured to monitor a physical downlink control channel (PDCCH) indicating a plurality of uplink-downlink configuration in a common search space for a primary cell, in a periodicity T, in a case where the PDCCH is detected in a radio frame, the uplink-downlink configuration for T/10 radio frames in a serving cell is given by the index.