Ntt Docomo, Inc.

Hideyuki Moroga

Satoshi Nagata

Kazuaki Takeda

Kazuki Takeda

Yuichi Kakishima

Yuki Matsumura

Shimpei Yasukawa

Liu Liu

Qin Mu

Hiroki Harada

Lihui Wang

Huiling Jiang

Shohei Yoshioka

Keisuke Saito

When using a different frequency band such as FR4, which is different from a frequency band including FR1 and FR2, the terminal uses a phase tracking reference signal (PTRS) having a different density in at least one of a time direction and a frequency direction to perform transmission or reception of a signal using the PTRS.

Terminal

A terminal is disclosed including a processor that assumes a position of an additional demodulation reference signal (DMRS) based on a value corresponding to whether frequency hopping is enabled or disabled; and a transmitter that transmits the additional DMRS according to an allocation duration of an uplink shared channel (PUSCH). In other aspects, a radio communication method and a base station are also disclosed.

Terminal, radio communication method and base station

A radio transmission device includes a transmitter () and a controller (). The transmitter () transmits a radio signal in which a demodulation reference signal is mapped. When a plurality of the demodulation reference signals are to be mapped respectively to first and second unit resources consecutive in a time domain of the radio signal, the controller () applies the same sequence to each of the plurality of the demodulation reference signals to be mapped to the first and the second unit resources.

Radio transmission device

A user terminal is disclosed, where a band to use is limited to a partial narrow band in a system band. The user terminal includes a transmitter that transmits and/or a receiver that receives a signal, and a controller that controls repetitious reception and/or repetitious transmission of a control channel in a random access procedure based on a coverage enhancement level for a random access channel. A radio base station that communicates with a user terminal is also disclosed, where a band to use is limited to a partial narrow band in a system band. The radio base station includes a transmitter that transmits and/or a receiver that receives a signal, and a controller that controls to transmit information to make the user terminal control repetitious reception and/or repetitious transmission of a control channel in a random access procedure based on a coverage enhancement level for a random access channel.

User terminal, radio base station and radio communication method

User equipment for communicating with a base station includes a processing unit, wherein when transmitting a physical uplink shared channel (PUSCH) to the base station prior to establishment of a radio resource control (RRC) connection between the base station and the user equipment, the processing unit controls frequency hopping applied to the PUSCH and a demodulation reference signal; a reception unit for receiving from the base station information indicating that frequency hopping is applied to the PUSCH; and a transmission unit for transmitting the PUSCH and the demodulation reference signal to which frequency hopping is applied; wherein the demodulation reference signal for demodulating a single PUSCH is formed of one front-loaded demodulation reference signal and one additional demodulation reference signal, and when the duration in symbols of the PUSCH does not support one additional demodulation reference signal, the demodulation reference signal is formed of a front-loaded demodulation reference signal.

User equipment and base station apparatus

A terminal is disclosed including a receiver that receives a signal of a downlink shared channel; and a transmitter that transmits Acknowledgement (ACK)/Negative Acknowledgement (NACK) information for the signal of the downlink shared channel using an uplink control channel in a time resource included in a plurality of time resource candidates. In other aspects, a radio communication method and a base station are also disclosed.

User terminal and radio communication method

A terminal is disclosed including a transmitter that transmits an uplink shared channel; and a processor that determines, when frequency hopping is applied to the uplink shared channel, a symbol for a demodulation reference signal of the uplink shared channel based on a mapping type of the uplink shared channel by using a start symbol of each hop as a reference point. In other aspects, a radio communication method is also disclosed.

A user equipment (UE) includes a transmitter that transmits, to a base station (BS), Demodulation Reference Signals (DM-RSs) using Discrete Fourier Transform (DFT)-spread (s)-Orthogonal Frequency-Division Multiplexing (OFDM). The resource elements (REs) that do not multiplex the DM-RSs in an OFDM symbol are set as Null. The transmission power for transmission of the DM-RSs is different from transmission power for transmission of normal DM-RSs. The normal DM-RS is a DM-RS using a Cyclic Prefix (CP)-OFDM. The UE further includes a processor that determines the transmission power for the DM-RSs based on a reciprocal of frequency multiplexing density of the DM-RSs. The transmission power for the DM-RSs is two times more than the normal DM-RSs when a configuration of the DM-RSs is a DM-RS configuration type 1. The transmission power for the DM-RSs is three times more than the normal DM-RSs when a configuration of the DM-RSs is a DM-RS configuration type 2.

User equipment that transmits demodulation reference signals (DM-RSs)

A new configuration suitable for a downlink single carrier is provided in a downlink control signal of a radio communication system of the future. A user terminal includes: a reception section that receives a downlink signal including a downlink control signal and a downlink data signal; and a demodulation and decoding section that uses the downlink control signal to demodulate and decode the downlink data signal, in which the downlink control signal is mapped to signal transmission points of a single carrier in units of control channel elements.

Terminals receiving downlink control signals and downlink data signals

In user terminalreception sectionreceives one or more downlink signals mapped to a plurality of signal transmission points in a single carrier, and extraction sectionextracts at least one of the one or more downlink signals that is assigned to at least one of the signal transmission points that belongs to a resource block group associated with user terminalin which the resource block group is in units of a predetermined number of signal transmission points and the at least one of the one or more downlink signals is extracted based on a definition of the resource block group. This processing makes it possible to multiplex downlink signals for a plurality of terminals in a single-carrier transmission.

The present invention is designed to optimize the uplink access procedure even when the band to use is limited to partial narrow bands in a system band. A user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives system information that includes indication information of an uplink carrier frequency, from a radio base station, as system information for narrow bands, which is different from system information for the system band, and a transmission section that transmits a random access preamble to the radio base station in one of a plurality of narrow bands that are specified by the indication information of the uplink carrier frequency.

Provided is a user equipment in a radio communication system including a base station and the user equipment. The user equipment includes: an acquisition unit that acquires a first transmission power parameter in a case of using OFDM in an uplink and a second transmission power parameter in a case of using DFT-s-OFDM in the uplink; and a control unit that controls transmission power of an uplink signal by using the first transmission power parameter in a case of using ODFM in the uplink, and controls transmission power of the uplink signal by using the second transmission power parameter in a case of using DFT-s-OFDM in the uplink.

User equipment, base station, and transmission power control method

A user equipment according to one embodiment of the present invention includes a reception unit that receives signal waveform configuration information related to either or both of a multicarrier scheme and a single carrier scheme to be applicable in uplink communication from a base station, a setting unit that sets the received signal waveform configuration information, and a transmission unit that transmits an uplink signal in accordance with the set signal waveform configuration information.

User equipment and uplink signal transmission method

In user terminal, control sectiondetermines signal waveforms according to a signal-waveform switching pattern notified by control sectionof base station, and indicates the signal waveforms to preprocessing section, signal detection section, and post-processing sectionfor each TTI. Configuration IDs are assigned to respective signal-waveform switching patterns, and signal waveforms that are to be transmitted in TTIs and that are specified by the TTI index are configured for each of the Configuration IDs. With this configuration, a plurality of signal waveforms whose symbol lengths are different from one signal waveform to another are used together while no symbol spans two adjacent TTIs.

The present invention is designed to measure and/or report CSI (Channel State Information) of a plurality of narrow bands, even when the band to use is limited to a partial narrow band in a system band. According to one aspect of the present invention, a user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives information related to CSI (Channel State Information) measurement in a narrow band, a measurement section that measures CSIs in a plurality of narrow bands based on the information related to CSI measurement, and a transmission section that reports the measured CSIs.

Growing community of inventors

Tokyo, Japan

Hideyuki Moroga