Abstract: A terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a receiver configured to receive information related to subcarrier spacing for an OFDM signal from the base station apparatus; and a transmitter configured to transmit an uplink data channel to the base station apparatus by using the OFDM signal, based on the information related to the subcarrier spacing. The transmitter generates the OFDM signal by using a plurality of the subcarrier spacings, and the transmitter configures a transmit power of the uplink data channel, based on the subcarrier spacing of subcarriers to which the uplink data channel has been mapped.

Abstract: To provide a base station apparatus, a terminal apparatus, and a communication method capable of efficiently performing retransmission control for small size data in grant-free multiple access where the base station apparatus accommodates a large number of terminal apparatuses.

Abstract: A terminal apparatus using large FFT points transmits a reference signal such that short OFDM symbols are repeated.

Abstract: The objective of the invention is to achieve efficient downlink non-orthogonal multiple access using a limited amount of control information. A base station device that adds and transmits symbols addressed to a first terminal device and one or more second terminal devices, using portion of available subcarriers, includes: a power setting unit that sets the first terminal device to a lower energy than the one or more second terminal devices; a scheduling unit that, for signals addressed to the one or more second terminal devices, performs resource allocation that is different from resource allocation for a signal addressed to the first terminal device; and an MCS determining unit that controls modulation schemes such that, when allocating resources for the signal addressed to the first terminal device, the modulation schemes used by the one or more second terminal devices, to be added to the signal addressed to the first terminal device, are the same.

Abstract: A base station apparatus, a terminal apparatus, and a communication method are provided that are capable of suppressing an increase in processing loads for identification of each terminal apparatus and signal detection for uplink data, a decrease in identification accuracy, and an increase in control information for identification of the terminal apparatus in a multiple access using grant free. A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive a multi-access signature process index from the base station apparatus, and a transmitter configured to transmit a demodulation reference signal and an uplink physical channel. The multi-access signature process index is information indicating association of a mark identifying the uplink physical channel transmitted by grant free access.

Abstract: Provided are a base station apparatus, a terminal apparatus and a communication method, capable of an efficient retransmission control of uplink data of which a resource for transmission is not discerned in grant-free multiple access. A terminal apparatus configured to communicate with a base station apparatus includes a transmitter configured to transmit an identifying signal indicating that the terminal apparatus itself transmits an uplink data channel and the uplink data channel. The uplink data channel includes an uplink data bit, a bit representing an identifier of the terminal apparatus, a first error detection bit generated from the uplink data bit, and a second error detection bit generated from the identifier of the terminal apparatus. The first error detection bit is scrambled using the identifier of the terminal apparatus, and the second error detection bit is scrambled using the identifying signal.

Abstract: To provide a base station apparatus, a terminal apparatus, and a communication method capable of efficiently performing retransmission control for small size data in grant-free multiple access where the base station apparatus accommodates a large number of terminal apparatuses. A base station apparatus for communicating with a terminal apparatus, the base station apparatus including: a transmitter configured to transmit an uplink grant indicating a resource for transmitting uplink data to the terminal apparatus; and a receiver configured to receive the uplink data transmitted from the terminal apparatus based on the uplink grant, and the uplink data transmitted from the terminal apparatus without being based on the uplink grant.

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 a large number of terminal apparatuses that are accommodated by contention-based radio communication technologies share a frequency resource, the number of data signals of the terminal apparatus that are non-orthogonally multiplexed in the spatial domain increases. If terminal apparatuses, of which the number exceeds the number of receive antennas or the spreading factor transmit uplink data at the same time, it is tantamount to a presence of terminal apparatuses using the same spreading code, and inter-user interference becomes a problem.

Abstract: In a case that a large number of terminal apparatuses accommodated in a contention based radio communication technology share a frequency resource, the number of data signals of the terminal apparatuses which are non-orthogonally multiplexed in the spatial domain increases. Therefore, in a case that the number of non-orthogonally multiplexed data signals of the terminals is considerably large, residual interference after removing interference in the reception processing degrades transmission performance.

Abstract: To improve throughput in a communication environment in which a large number of terminal apparatuses access. The present invention includes a receiver configured to receive information indicating whether a radio resource allocated by a base station apparatus is a grant free access resource or a scheduled access resource, as well as transmission power control information in the scheduled access resource (first transmission power control information) and transmission power control information in the grant free access resource (second transmission power control information); and a transmitter configured to transmit a transmission signal to the base station apparatus.

Abstract: Provided are a base station apparatus, a terminal apparatus, and a communication method, in a case that uplink data transmission based on orthogonal multiple access and uplink data transmission based on non-orthogonal multiple access coexist in a cell in which many terminal apparatuses present, capable of maintaining a prescribed communication quality for the uplink data. The base station apparatus for communicating with a terminal apparatus configured to support contention based access and non-contention based access transmits, in a case that an uplink data channel received in a non-contention based manner occurs in a subframe including the contention based access region, a contention based transmission configuration change notification with respect to a subframe configured to receive the uplink data channel.

Abstract: In a case of a contention-based radio communication technique, it is necessary to identify a terminal apparatus that has performed data transmission among terminal apparatuses sharing a frequency resource. There is a problem that it is difficult to identify the terminal apparatus that has performed data transmission in a case with a large number of terminal apparatuses that are non-orthogonally spatial multiplexed.

Abstract: In a case of a contention-based radio communication technique, it is necessary to identify a terminal apparatus that has performed data transmission among terminal apparatuses sharing a frequency resource. There is a problem that it is difficult to identify the terminal apparatus that has performed data transmission in a case with a large number of terminal apparatuses that are non-orthogonally spatial multiplexed.

Abstract: In a case of a contention-based radio communication technique, it is necessary to identify a terminal apparatus that has performed data transmission among terminal apparatuses sharing frequency resources. There is a problem that it is difficult to identify the terminal apparatus that has performed data transmission in a case with a large number of terminal apparatuses that are non-orthogonally spatial multiplexed. Provided is a transmission device for transmitting a data signal to a reception device, the transmission device including: a transmission processing unit configured to transmit the data signal without performing SR transmission or receiving control information of transmission permission transmitted from the reception device; an identification signal multiplexing unit configured to multiplex an identification signal to an orthogonal resource; and a control information receiving unit configured to receive in advance a transmission parameter relating to transmission of the data signal.

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: A reduction in interference improves throughput and increase opportunity for communication by each terminal apparatus. A base station apparatus that communicates with a terminal apparatus transmits information relating to a transmit power for a UE-specific reference signal in a state of being included in downlink control information, in a case of a predetermined transmission mode. A terminal apparatus that communicates with a base station apparatus includes a reception unit that receives downlink control information which includes information relating to a transmit power for a UE-specific reference signal, from the base station apparatus, in a case of a predetermined transmission mode, and a reception signal is demodulated based on the downlink control information.

Abstract: A time period between transmission of a synchronization signal and the next transmission thereof may become undesirably 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 includes: a DL signal generator that generates a signal to be transmitted to the terminal apparatus; a radio transmitter that transmits the signal; and a connected terminal manager that receives subframe information to be transmitted to the terminal apparatus from another base station apparatus that communicates with the terminal apparatus in the first frequency band. The radio transmitter transmits the signal with at least one subframe included in the subframe information.

Abstract: Provided is a communication device, even in a case that many communication devices are connected in a radio communication network constituted of a plurality of different radio communication technologies, that suppresses data transmission of one communication technology from delaying due to data transmission situation of another communication device and enables coexistence of different radio communication technologies.

Abstract: To provide a base station apparatus, a terminal apparatus, and a communication method where the terminal efficiently learns information of an interference signal and reduces interference in a reception process to thereby enhance throughput. Provided is a terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a higher layer processing unit for which multiuser superposition transmission (MUST) is configured by the base station apparatus; and a reception unit configured to receive, in a case that the MUST is configured, downlink control information including any of power allocation information, presence/absence of interference, and indication of whether the terminal apparatus is a near-UE or a far-UE or a superposition transmission method.