Abstract: Symbol replica precision is improved when symbol-level cancellation is performed in a receiver in downlink non-orthogonal access. Transmission is performed by multiplexing a transmission scheme by which excellent performance is obtained during demodulation and a transmission scheme by which excellent performance is obtained during decoding. Provided is a base station device including an addition unit that adds a number of signals the number exceeding a number of transmit antenna ports at the same time and the same frequency, and performing transmission from one or more transmit antenna ports. The addition unit adds signals generated by mutually different transmission schemes. Provided is a terminal device that receives a signal in which a number of signals generated by mutually different transmission schemes are added, the number exceeding a number of transmit antenna ports, at the same time and the same frequency.

Abstract: Provided are a base station apparatus, a terminal device, and a communication method that can realize a small cell network while reducing load on the terminal device, the small cell network including a small cell performing massive MIMO transfer. The base station apparatus of the present invention is a second base station apparatus included in a communication system in which a plurality of the second base station apparatuses capable of acquiring assistance information from a first base station apparatus communicates with a terminal device, the base station apparatus including a codebook that describes a plurality of linear filters, in which the same cell identification number as at least one of the other second base station apparatuses is configured, and a synchronization signal correlated with the cell identification number is transmitted on the basis of the plurality of linear filters after first precoding of the synchronization signal.

Abstract: There has been a problem that a time period between transmission of a synchronization signal and the next transmission thereof may become longer depending on a usage state of an unlicensed band and a terminal apparatus requires a long time to measure receive power of signals from a plurality of base station apparatuses that perform communication in the unlicensed band. A base station apparatus that communicates with a terminal apparatus in a second frequency band different from a first frequency band that is able to be used exclusively includes: a DL signal generation unit that generates a signal to be transmitted to the terminal apparatus; a radio transmission unit that transmits the signal; and a connected terminal management unit that receives information about a plurality of subframes in which a signal is able to be transmitted to the terminal apparatus from another base station apparatus that communicates with the terminal apparatus in the first frequency band.

Abstract: A terminal apparatus that can efficiently assign transmitting power is provided. The terminal apparatus terminal apparatus that performs communication with a plurality of cells simultaneously includes a control signal processor that receives a control signal providing a notification indicating that at least one of the plurality of cells is to enter an off state in which data communication is not performed temporarily, and a transmitting power controller that, in a case where transmitting power of each of the plurality of connected cells is determined and in a case where a value of a total of the transmitting power needed for the plurality of cells is judged to exceed maximum transmitting power of the terminal apparatus, refers to content of the notification provided by the control signal and judges priority in assigning transmitting power to a channel and a signal that are transmitted in each of the plurality of connected cells.

Abstract: Optimal transmit power control is performed in a band other than licensed bands. When the way of specifying transmit power differs between the licensed band and a frequency band other than the licensed band, the expression of the transmit power control is changed to perform transmit power control. A terminal apparatus includes a carrier aggregation radio transmission unit configured to simultaneously transmit a plurality of component carriers, and a transmit power control unit configured to control transmit power of each of the plurality of component carriers, wherein the transmit power control unit calculates a transmit power of a dedicatedly usable first component carrier among the plurality of component carriers in consideration of the transmit power of the first component carrier, and calculates a transmit power of a second component carrier other than the dedicatedly usable first component carrier in consideration of the transmit power of the first component carrier.

Abstract: There is provided a wireless communication apparatus which achieves high efficiency in power use in such a manner that transmission power is adequately distributed in simultaneous transmission to multiple base stations. The wireless communication apparatus provided by the present invention, at the same time, transmits a first data signal to a first base station apparatus by using a first CC and transmits a second data signal to a second base station apparatus by using a second CC. The wireless communication apparatus includes a transmission-power controller that scales transmission power by using different scaling factors for the first data signal and the second data signal, when the sum of transmission power of the first data signal and transmission power of the second data signal is larger than a predetermined value. The transmission power of the first data signal is calculated to obtain predetermined reception power in the first base station apparatus.

Abstract: A bit coding device that creates a coded bit sequence by performing error correction coding on an input bit sequence that is input, includes a coding unit that creates a first bit sequence by performing the error correction coding on the input bit sequence, an extraction unit that extracts a second bit sequence from the first bit sequence, and an information compression unit that creates a third bit sequence by performing lossy compression on the second bit sequence, in which coded bits include at least a portion of the third bit sequence.

Abstract: In an LTE-A system, there is a problem that it is difficult to perform stable communication in a case where there is a time when another system occupies an unlicensed band being used. There is provided a base station apparatus that communicates with a terminal device in a second frequency band different from a first frequency band capable of being used as a dedicated frequency band. The base station apparatus includes: a wireless transmission unit that transmits data or control information to the terminal device; and a wireless reception unit that receives data or control information transmitted from the terminal device.

Abstract: A terminal apparatus, which performs communication with a first base station apparatus and a second base station apparatus which has a smaller maximum transmit power than that of the first base station apparatus, includes a control unit that extracts control information from signals received from the first base station apparatus and the second base station apparatus and sets communication parameters of an uplink data signal, in which a bit number of information which is extracted by the control unit as the control information from the signal from the second base station apparatus is smaller than a bit number of information which is extracted as the control information from the signal from the first base station apparatus.

Abstract: In an LTE-A system, there is a problem that it is difficult to perform stable communication in a case where there is a time when another system occupies an unlicensed band being used. There is provided a base station apparatus that communicates with a terminal device in a second frequency band different from a first frequency band capable of being used as a dedicated frequency band. The base station apparatus includes: a CS determination unit that performs carrier sense in a subframe of carrier sense configured in the second frequency band; a synchronization signal generation unit that generates a synchronization signal; and a wireless transmission unit that transmits the synchronization signal. In a case where the CS determination unit determines that another system does not perform communication in the second frequency band, the wireless transmission unit transmits the synchronization signal generated by the synchronization signal generation unit.

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 is a base station apparatus 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. The base station apparatus synchronizes a frame number of a frame of a first signal transmitted using the first frequency band with a frame number of a frame of a second signal irrespective of whether or not the second signal transmitted using the second frequency band is transmitted.

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: MCS that provides high accuracy is selected in semi-persistent scheduling (SPS). A terminal apparatus configured to receive control information includes a control information extraction unit configured to decode the control information using C-RNTI information and extract an MCS index from the control information, and a PDSCH demodulation unit configured to determine MCS using the MCS index and an MCS table and perform a demodulation, wherein the PDSCH demodulation unit selects a particular MCS table from a plurality of MCS tables in accordance with the C-RNTI information used in the decoding.

Abstract: Provided are a base-station apparatus, a terminal apparatus, and a communication method that make it possible to realize a LTE-A system which, while suppressing interference from an existing system, improves throughput by applying CA to an unlicensed band. The base-station apparatus of the invention is included in a communication system, in which a first communication scheme applied to a frequency band that is able to be used exclusively is applied to a frequency band that is not able to be used exclusively, transmits a resource reservation signal which reserves the frequency band that is not able to be used exclusively to the frequency band that is not able to be used exclusively based on a second communication scheme different from the first communication scheme, and applies the first communication scheme to the frequency band that is not able to be used exclusively after transmitting the resource reservation signal.

Abstract: More efficient control and stably establishing, securing, and continuing communication using unlicensed bands, in use of the unlicensed bands.

Abstract: Provided are a base-station apparatus, a terminal apparatus, and a communication method that make it possible to realize a LTE-A system which, while suppressing interference from an existing system, improves throughput by applying CA to an unlicensed band.

Abstract: When an unlicensed band is used, a more efficient control is provided, and a communication is established, or ensured and continues by stably using the unlicensed band. According to the present invention, there is provided a base station apparatus which applies a communication scheme applied to a frequency band allowed to be dedicatedly used, to a frequency band of which dedicated use is not allowed, and enables a communicate with a terminal device by using the frequency band of which dedicated use is not allowed, along with the frequency band allowed to be dedicatedly used. In a state where the frequency band of which dedicated use is not allowed is not used for a communication with the terminal device, to which the communication scheme is applied, the terminal device is notified of control information, and thus the communication scheme is applied to the frequency band of which dedicated use is not allowed, and the terminal device is instructed to communicate with the base station apparatus.

Abstract: A mobile station transmitting transmission signals using one of a plurality of transmission schemes which includes at least a first transmission scheme and a second transmission scheme, where in a case that the used transmission scheme is the first transmission scheme, the transmission signals are applied by an open loop (OL) in which precoding information is not fed back and in a case that the used transmission scheme is the second transmission scheme, the transmission signals are applied by a closed loop (CL) for which a precoding matrix indicator (PMI) is fed back from the mobile station. The first peak-to-average power ratio (PAPR) characteristics of the first transmission scheme differs from the second PAPR characteristics of the second transmission scheme.

Abstract: There has been a problem that, when performing transmission of an SR or transmission of an RACH signal in a PUCCH in order for a terminal apparatus to request resource allocation for uplink use, the terminal apparatus transmits these signals to a pico base station apparatus in an Off-state. A base station apparatus which transmits a signal to the terminal apparatus by switching a first state in which a data signal is transmitted and a second state in which the data signal is not transmitted, includes a transmission state management unit for managing a state of the base station apparatus and a discovery signal generation unit for generating a discovery signal, in which the discovery signal is transmitted by changing a sequence generation method of a signal of the discovery signal generation unit based on information of the first state or the second state held in the transmission state management unit.

Abstract: Selection of a suitable MCS improves throughput without increasing the number of pieces of control information. Provided is a terminal apparatus including: a control information extraction unit 703 that receives control information for requesting a CSI notification; a CQI determination unit 707 that calculates CQI according to the control information and calculates a CQI index by any CQI table of a first CQI table and a second subframe from the CQI; and a UL transmission unit 711 that performs uplink transmission of the CQI index to a base station apparatus, in which, in a case where the control information is received on a first downlink subframe set, the CQI determination unit 707 generates the CQI index using the first CQI table, and in which, in a case where the control information is received on a second downlink subframe set, the CQI determination unit 707 generates the CQI index using the second CQI table.