Abstract: A communication apparatus comprises a transmitter configured to transmit a random access preamble, and a controller configured to control a state related to monitoring of a physical downlink control channel (PDCCH) based on the transmission of the random access preamble.

Abstract: Method of scrambling signals, transmission point device, and user equipment using the method are provided. The method includes: sending an ID table to a user equipment through higher layer signaling, the ID table being a subset of the whole ID space and containing available IDs for the user equipment; notifying the user equipment an ID in the ID table to be used through physical layer signaling or UE specific higher layer signaling; generating a random seed based on the notified ID; initializing a scrambling sequence by the random seed; and scrambling the signals with the initialized scrambling sequence. The method of the disclosure, by combining physical layer signaling and higher layer signaling, may notify the used group ID and the blind detection space to a UE, wherein the blind detection for the UE is enabled and the signaling overhead is reduced.

Abstract: Provided are wireless communication methods and devices. In one embodiment, a wireless communication method performed by a wireless communication device comprises: transmitting a data packet repeatedly in multiple subframes including at least one normal subframe and at least one special subframe to another wireless communication device, wherein the available resources in the special subframe are different from that in the normal subframe, the data packet includes multiple modulated symbols which are divided into multiple modulated-symbol sets, in each subframe, each OFDM symbol is mapped by one of the modulated-symbol sets, and in every subframe, the modulated symbols in the same modulated-symbol set are mapped onto REs in one OFDM symbol in a fixed order. In another embodiment, multiple repetitions of the data packet are transmitted in each subframe, and in each special subframe, different repetitions are mapped onto REs with cyclic shift.

Abstract: A terminal apparatus includes: a reception unit which receives, from a base station apparatus, a physical downlink control channel including downlink control information in a search space specific to the terminal apparatus; and a control unit which determines the number of bits of a time domain resource allocation field in the downlink control information. The time domain resource allocation field is a time domain resource allocation field for a physical downlink shared channel. A default table indicates a time domain resource allocation configuration for the physical downlink shared channel. When a parameter is not received, the number of bits of the time domain resource allocation field is determined based on the number of the in the default table.

Abstract: The present disclosure provides a power control method and a wireless device, in a cluster comprised of wireless devices including a first wireless device and a second wireless device, comprising: receiving power control information including a second data channel transmission power, from the second wireless device; determining a first data channel transmission power based on the second data channel transmission power; and controlling data channel transmission power of the first wireless device according to the first data channel transmission power; wherein, the first data channel transmission power is a power allowing the first wireless device to reach all wireless devices in the cluster, and the second data channel transmission power is a power allowing the second wireless device to reach all wireless devices in the cluster.

Abstract: Provided is a terminal including a receiver, which, in operation, receives a Channel State Information Reference Signal (CSI-RS) candidate list for CSI-RS configuration information. The CSI-RS candidate list is indicated as Radio Resource Control (RRC) control information for respective terminals. The terminal further includes circuitry, which, in operation, specifies at least one CSI-RS resource information of a measurement target based on the CSI-RS candidate list, and measures a reception power using the specified CSI-RS resource information. The terminal also includes a transmitter, which, in operation, reports the result of the reception power measurement. A reception power measurement method is also provided.

Abstract: A base station is disclosed, which is capable of appropriately configuring the timings of data assignment, data transmission and reception, and feedback for a case where the DL and UL sTTI lengths are different from each other. In this base station (100), a transmission section (106) transmits a downlink signal using a first short transmission time interval (sTTI) shortened in length than a TTI and used for downlink; and a reception section (107) receives an uplink signal using a second sTTI shortened in length than the TTI and used for uplink. When the first sTTI is shorter in length than the second sTTI, the reception section (107) receives the uplink signal in the second sTTI positioned after a predetermined interval from the transmission timing of the downlink signal, the predetermined interval being configured based on the length of the first sTTI.

Abstract: To measure the channel quality of the own cell accurately in a condition where there is no interference from a neighbor cell. A wireless communication terminal according to the invention is a wireless communication terminal to be connected to a base station for transmitting and receiving data to/from the base station, the wireless communication terminal including: a receiver that receives a signal which includes control information provided for measuring a channel quality of own cell from the base station; an extractor that extracts the control information from the signal received by the receiver; a measurement section that measures, on the basis of the control information, the channel quality of the own cell in a domain where a neighbor cell does not transmit a signal; and a transmitter that transmits a measurement result of the channel quality of the own cell measured by the measurement section, to the base station.

Abstract: The present disclosure provides a terminal device that allows constraints on user allocation to be prevented and spread codes to be allocated in a scheduler when non-adaptive HARQ is employed using a PHICH. A codeword generator generates code words by encoding data, a layer mapping unit places each CW in one or a plurality of layers, a DMRS generator generates a reference signal for each layer in which a CW is placed by using any resource among a plurality of resources defined by a mutually orthogonal plurality of OCCs, and an ACK/NACK demodulator receives a response signal indicating a retransmission request. When a response signal requesting retransmission of only a CW placed in a plurality of layers is received, the DMRS generator uses each resource having the same OCC among the plurality of resources for the reference signals generated in the corresponding layers.

Abstract: A communication apparatus, comprises: a receiver configured to receive a radio resource control (RRC) message including information for configuring a cell group from a base station; a transmitter configured to transmit a scheduling request (SR); and a controller configured to control a condition related to monitoring of a physical downlink control channel (PDCCH) in each serving cell in the cell group based on the transmission of the SR or a trigger of the SR.

Abstract: A user equipment 100 to which a plurality of cell groups are configured by a base station 200, comprises the steps of: receiving a switching instruction for giving an instruction about switching of search space set groups (SSSGs) in serving cells belonging to any cell group of the plurality of cell groups from the base station 200; specifying a target cell group as a switching target of the SSSG from among the plurality of cell groups based on a cell identifier or a cell group identifier included in the switching instruction. The UE 100 is configured to simultaneously switch the SSSGs of all the serving cells in the specified target cell group in response to the reception of the switching instruction.

Abstract: A communication apparatus comprises a transmitter configured to transmit a scheduling request (SR), and a controller configured to control a state related to monitoring of a physical downlink control channel (PDCCH) based on the transmission of the SR or a trigger of the SR.

Abstract: A repeater generates repetition signals by repeating uplink signals over a plurality of subframes; controller sets a timing for transmitting the repetition signals, based on information indicating a transmission candidate subframe for a sounding reference signal used for measuring an uplink reception quality; and a transmitter transmits the repetition signals at the set timing.

Abstract: A communication system includes a communication apparatus and a base station. The communication apparatus includes a Discrete Fourier Transform (DFT) transformer which transforms a time-domain signal into a frequency-domain signal with a DFT size that is a product of powers of a plurality of values; a mapper which maps the frequency-domain signal on a plurality of frequency bands, each frequency band being located at a position separate from position(s) of other(s) of the plurality of frequency bands; and a signal generator which generates a single carrier-frequency division multiple access (SC-FDMA) time-domain signal from the mapped signal. The base station includes a receiver which receives the SC-FDMA time-domain signal; a combiner which generates the frequency-domain signal from the SC-FDMA time-domain signal; and a transformer which transforms the frequency-domain signal into the time-domain signal with an inverse Discrete Fourier Transform (IDFT) having the DFT size.

Abstract: A communication apparatus comprises: a receiver configured to receive, from a base station, a radio resource control (RRC) message including first information used to configure a plurality of search space set groups and second information used to configure a timer value for monitoring of a physical downlink control channel (PDCCH), and to receive, from the base station, downlink control information (DCI) including an information field related to the monitoring of the PDCCH; and a controller configured to control, based on a value set in the information field, start of the monitoring of the PDCCH according to one search space set group among the plurality of search space set groups. One value for the plurality of search space sets is configured as the timer value.

Abstract: Provided is a radio communication device which can separate propagation paths of antenna ports and improve a channel estimation accuracy even when using virtual antennas. The device includes: a mapping unit which maps a data signal after modulation to a virtual antenna and a virtual antenna; a phase inversion unit which inverts the phase of S0 transmitted from an antenna port in synchronization with a phase inversion unit between the odd-number slot and the even-number slot; the phase inversion unit which inverts the phase of R0 transmitted from the antenna port; a phase inversion unit which inverts the phase of S1 transmitted from an antenna port in synchronization with a phase inversion unit; and the phase inversion unit which inverts the phase of R1 transmitted from an antenna port.

Abstract: A communication apparatus comprises: a communicator configured to receive, from a base station, a radio resource control (RRC) message including information configuring a skipping duration during which monitoring of a physical downlink control channel (PDCCH) is skipped, and to receive, from the base station and through the PDCCH, downlink control information (DCI) including an information field related to the monitoring of the PDCCH; and a controller configured to control, based on a value set in the information field, skipping of the monitoring of the PDCCH over the skipping duration. The controller is configured to perform control so as not to execute the skipping of the monitoring of the PDCCH while a timer is in operation, the timer being related to retransmission for a discontinuous reception (DRX) operation.

Abstract: A communication apparatus configured with one or a plurality of cell groups by a base station, the communication apparatus comprises: a receiver configured to receive, from the base station, downlink control information (DCI) including an information field related to monitoring a physical downlink control channel (PDCCH) in a serving cell belonging to any cell group of the one or the plurality of cell groups; and a controller configured to execute a procedure related to monitoring the PDCCH on the basis of a value set in the information field. The procedure related to monitoring the PDCCH is applied to all serving cells in the cell group to which the serving cell in which the DCI is received belongs.

Abstract: There are provided a wireless communication method of configuring a measurement resource and a wireless communication device therefor. The method comprises determining a measurement resource to be disregarded when the number of measurement resources configured in one subframe exceeds the maximum number of measurement resources that a user equipment is able to measure in one subframe, wherein the measurement resource with lower priority is determined to be disregarded, and the measurement resource is not disregarded A times within the duration of N subframes, where A is an integer larger than 1, N corresponds to one plus B*periodicity of the measurement resource, and B is an integer equal to or larger than 1.

Abstract: A reception processor receives the cell detection reference signals, each of the cell detection reference signals being transmitted from corresponding one of a plurality of cells. An RRM report generator generates measurement information indicating a measurement result of reception quality measured using the cell detection reference signal. A transmission processor transmits the measurement information. The cell detection reference signals are mapped to any one of a plurality of candidate resources, which is a part of a plurality of resources set for other reference signals in a subframe to which the cell detection reference signals are mapped.