Abstract: Provided is a communication system with low latency and high reliability, etc. Even after transitioning from RRC_CONNECTED to RRC_INACTIVE, a communication terminal device maintains secondary base station configuration information on configuring a secondary base station Even when at least one of a master base station and a secondary base station is changed during the RRC_INACTIVE, the communication terminal device maintains the secondary base station configuration information. The communication terminal device again transitions to the RRC_CONNECTED using the maintained secondary base station configuration information.

Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.

Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.

Abstract: A base station as a transmitter includes: a plurality of antenna units each capable of forming a plurality of beams; a candidate beam grouping unit that performs grouping of each beam formable by the plurality of antenna units, the grouping being performed based on the antenna unit that forms each beam; and a transmission signal generation unit that generates a transmission signal including beam identification information of a beam formed by the plurality of antenna units and group information indicating a group to which the beam belongs, and outputs the transmission signal generated to the antenna unit that forms a beam corresponding to the beam identification information included in the transmission signal.

Abstract: The present invention relates to a method implemented by computer means of a communicating entity, for inserting a reference signal for phase tracking, said communicating entity using a discrete Fourier transformation spread orthogonal frequency division multiplexing modulator, characterized in that the method comprises: obtaining a succession of signal samples by inserting said reference signal for phase tracking within a succession of data samples, according to at least one insertion pattern chosen among pre-defined patterns with respect to predetermined criteria of communication conditions, and feeding said modulator with a succession of signal blocks obtained from said succession of signal samples, so as to apply the discrete Fourier transformation after the insertion of the reference signal for phase tracking.

Abstract: Provided is a communication system with high reliability, etc. A communication system includes a base station, and a plurality of terminal devices configured to perform radio communication with the base station. When one slot includes a sounding reference signal (SRS) symbol range consisting of one or more symbols allocated to an SRS of a first terminal device, a first symbol range consisting of one or more symbols before the SRS symbol range, and a second symbol range consisting of one or more symbols after the SRS symbol range, a second terminal device different from the first terminal device performs uplink communication to the base station using at least one of the first symbol range and the second symbol range.

Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.

Abstract: Provided is a communication system, etc. with low latency and high reliability, under New Radio (NR). A communication system includes a communication terminal device, and a plurality of nodes configured to be connected to the communication terminal device for radio communication and to provide a split bearer for the communication terminal device. The communication terminal device is configured to perform uplink transmission to an uplink transmission node among the plurality of nodes. The uplink transmission node is determined by an uplink transmission node determination process in which a node that provides the uplink transmission from the communication terminal device with lower latency among the plurality of nodes is determined as the uplink transmission node.

Abstract: A transmission device includes a data generation unit to generate a data symbol, a linear processing unit to generate an additional symbol, a power conditioning unit to perform power conditioning on the additional symbol, a frequency-domain multiplexing unit to arrange the additional symbol after the power conditioning and the data symbol along a frequency axis, a conversion unit to convert a signal arranged along the frequency axis by the frequency-domain multiplexing unit into a time domain signal, and a transmission processing unit to transmit the time domain signal. The linear processing unit generates the additional symbol to cause a data portion in a predetermined position in a block, which is a transmission unit of the time domain signal, to be set as a predetermined data group.

Abstract: A transmission device includes a data generation unit to generate a data symbol, a linear processing unit to generate an additional symbol, a power conditioning unit to perform power conditioning on the additional symbol, a frequency-domain multiplexing unit to arrange the additional symbol after the power conditioning and the data symbol along a frequency axis, a conversion unit to convert a signal arranged along the frequency axis by the frequency-domain multiplexing unit into a time domain signal, and a transmission processing unit to transmit the time domain signal. The linear processing unit generates the additional symbol to cause a data portion in a predetermined position in a block, which is a transmission unit of the time domain signal, to be set as a predetermined data group.

Abstract: A base station (1) according to the present invention includes: a control unit (10) that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit (12-1 to 12-N) that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit (10); and a precoding unit (13) and a transmitting unit (14) that perform space-division multiplexing on signals of one or more layers arranged by the processing unit (12-1 to 12-N), and transmit the multiplexed signals.

Abstract: The present invention is a transmitter compatible with a multicarrier block transmission scheme. The transmitter includes: a fixed sequence generation unit that generates a fixed sequence; a data sequence generation unit that converts data symbols into a time domain signal to generate a data signal; a multiplexing unit that divides the fixed sequence into two divisions, places one of the two divisions at the head and another one of the two divisions at the tail of a block, and places a data sequence that is an output signal from the data sequence generation unit between the two divisions to generate a block signal; and an interpolation unit that performs interpolation processing on the block signal.

Abstract: Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal. The eNB may predetermine scheduling for retransmission to retransmit the downlink signal, before performing initial transmission of the downlink signal.

Abstract: A transmitting apparatus includes: a data generator that generates data symbols; a zero generator that generates zero symbols having signal values of zero; a controller that receives the data symbols and the zero symbols, and controls symbols to be output; a static sequence generator that generates static sequence symbols having signal values of a static sequence; a multiplexer that divides the static sequence symbols and generates a pre-interpolation block by arranging the divided static sequence symbols at a head of the pre-interpolation block and a tail of the pre-interpolation block in the pre-interpolation block, the head preceding the symbols input from the controller, the tail following the symbols input from the controller, and a signal converter that performs a Fourier transform, the interpolation, and an inverse Fourier transform on the pre-interpolation block and outputs a block having being subjected to the interpolation.

Abstract: Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal.

Abstract: When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).

Abstract: The present invention is a transmitter compatible with a multicarrier block transmission scheme. The transmitter includes: a fixed sequence generation unit that generates a fixed sequence; a data sequence generation unit that converts data symbols into a time domain signal to generate a data signal; a multiplexing unit that divides the fixed sequence into two divisions, places one of the two divisions at the head and another one of the two divisions at the tail of a block, and places a data sequence that is an output signal from the data sequence generation unit between the two divisions to generate a block signal; and an interpolation unit that performs interpolation processing on the block signal.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.

Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.