Ntt Docomo, Inc.

Agency for Science, Technology and Research

Nit Docomo, Inc.

Kazuaki Takeda

Satoshi Nagata

Kazuki Takeda

Yoshihisa Kishiyama

Hiroki Harada

Hideaki Takahashi

Tooru Uchino

Liu Liu

Qin Mu

Keisuke Saito

Tetsushi Abe

Yousuke Sano

Yuichi Kakishima

Huiling Jiang

Nobuhiko Miki

Yuta Sagae

Yusuke Ohwatari

Hideyuki Moroga

Hiroyuki Ishii

Lan Chen

Chongning Na

Sadayuki Abeta

Daisuke Nishikawa

Xiaolin Hou

Lihui Wang

Shimpei Yasukawa

Daiki Takeda

Yuki Matsumura

Anass Benjebbour

Ryosuke Osawa

Wuri Andarmawanti Hapsari

Yukihiko Okumura

Kohei Kiyoshima

Naoto Ookubo

Takayuki Isogawa

Jing Wang

Xin Wang

Tomoya Ohara

Hidekazu Taoka

Takehiro Nakamura

Anil Umesh

Wenbo Wang

Hiromasa Umeda

Naoto Okubo

Yang Lu

Takeshi Nakamori

Mamoru Sawahashi

Mikio Iwamura

Qun Zhao

Motohiro Tanno

Huan Wang

Hidetoshi Kayama

Min Liu

Zhongding Lei

Teruo Kawamura

Xiaoming She

Ruifeng Ma

Daisuke Murayama

Anxin Li

Xiang Yun

Katsutoshi Kusume

Takuma Takada

Jiahui Liu

Wenjia Liu

Tianyang Min

Shinpei Yasukawa

Huiling Li

Runxin Wang

Francois Po Shin Chin

Jian Zhao

Yuan Yan

A user equipment including: a transmission unit that transmits a signal to a base station apparatus using a preconfigured uplink resource; a reception unit that receives a signal from the base station apparatus; and a control unit that starts or restarts a predetermined timer in response to receiving the signal from the base station apparatus.

User equipment, base station apparatus and communication method

A radio communication method according to an aspect of the present invention includes: receiving, at a first base station, at least a part of downlink control information via a downlink shared channel from a second base station; receiving, at user terminal, downlink control information via a downlink control channel from the first base station; and controlling, at the user terminal, reception of a downlink shared channel from the first base station or transmission of an uplink shared channel to the first base station on the basis of the downlink control information.

User terminal and radio communication method

A user equipment includes a control unit that sets an operation mode of the user equipment to an idle mode; and a transmission unit that transmits, while a time alignment retained by the control unit is valid, information indicating presence of the user equipment on each of transmission resources with a predetermined frequency in a time direction, from among a plurality of transmission resources that is preconfigured for transmitting data in the idle mode and arranged in the time direction, wherein the transmission unit stops transmitting the information indicating the presence of the user equipment in response detecting that the time alignment is invalid.

User equipment, base station and communication method

A terminal includes a receiving unit that receives information indicating whether each condition of one or more conditions for validating a time alignment is activated or deactivated; and a control unit that independently activates or deactivates each condition of the one or more conditions in accordance with the received information.

Terminal, base station, and communication method

The present invention is designed to enable quick beam recovery. A user terminal according to the present invention has a receiving section that receives a downlink (DL) signal, and a control section that controls a beam that is used to transmit and/or receive the DL signal, and the control section controls transmission of an uplink (UL) signal that requests switching of the beam, based on the received power and/or the received quality of a plurality of mobility measurement signals that are respectively associated with a plurality of beams.

A terminal is disclosed that includes a receiver that receives sidelink control information and data in sidelink and a transmitter that transmits a feedback signal corresponding to the data on a sidelink feedback channel. The transmitter determines a resource for transmitting the feedback signal based on a correspondence between a resource of the data and a resource for feedback. In other aspects, a base station, systems, and feedback methods are also disclosed.

Terminal, base station, system, and feedback method

A terminal is disclosed that includes a receiver that receives, via higher layer signaling, configuration information indicating a first resource for interference measurement, a second resource of non-zero power (NZP) channel state information reference signal (CSI-RS) for interference measurement, and a third resource of NZP CSI-RS for channel measurement. The terminal also includes a processor that performs interference measurement by using the first resource or the second resource, and performs channel measurement by using the third resource. The configuration information indicates a plurality of combinations of a third resource candidate and at least one of a first resource candidate and a second resource candidate. The processor uses, for measurement, a combination indicated by downlink control information among the plurality of combinations. In other aspects, a radio communication method, a base station, and a system are also disclosed.

Terminal, radio communication method, base station, and system

A terminal is disclosed that includes a receiver that receives, in a first cell, information indicating a measurement object including information regarding a parameter of a discovery or measurement signal. The terminal also includes a processor that performs a measurement using the discovery or measurement signal based on the information indicating the measurement object and a transmitter that transmits a result of the measurement, where when the information indicating the measurement object designates a timing that is synchronous with the first cell, the processor performs the measurement in a second cell based on the timing that is synchronous with the first cell. In other aspects, a radio communication method and a base station are also disclosed.

Terminal, radio communication method, and base station

A terminal includes a reception unit for receiving, from a base station that is a master node, a first message to configure communications with a master cell group and a secondary cell group, a communication unit for performing the communications with the master cell group and the secondary cell group configured that are based on the first message, a control unit for detecting an occurrence of a failure in communications with the secondary cell group, and a transmission unit for transmitting, when the control unit detects the occurrence of the failure in the communications with the secondary cell group, a second message including information indicating the occurrence of the failure in the secondary cell group, wherein the control unit includes location information in the second message when the first message is configured to have information indicating that the location information is to be included in the second message.

Terminal and base station

A user equipment includes a control unit that sets an operation mode of the user equipment to an idle mode; a transmission unit that transmits data by using a preconfigured radio resource for transmitting data in the idle mode; and a reception unit that receives transmission acknowledgement information for the data by monitoring at least one search space from a paging search space or an additional search space that is to be monitored in the idle mode.

User equipment and communication method

To configure proper time intervals to meet various communication requirements in radio communication systems, and perform various types of processing in the time interval, a user terminal is provided with a transmitting/receiving section that receives numerology information on numerology, and a control section that controls transmission of an uplink signal and/or reception of a downlink signal, according to a basic time unit determined based on configuration information including the numerology information.

To properly receive a preamble and/or a message in a random access procedure in communication using beam forming, and perform random access with efficiency, a user terminal of the present invention is a user terminal for communicating with a radio base station using a plurality of types of beam forming, and is characterized by having a receiving section that receives a DL signal transmitted from the radio base station, a transmitting section that transmits a random access preamble (PRACH), and a control section that controls to transmit the PRACH including beam information on a beam of the radio base station.

Terminal, radio communication method, and system for a random access procedure in communication using beam forming

A base station apparatus including: a transmission unit that transmits a first activation signal, which is an activation signal that becomes a trigger for monitoring a paging occasion, for each group of grouped user equipments and transmits a second activation signal, which is a activation signal common to multiple groups, wherein the transmission unit transmits, to the user equipment, information instructing whether to perform monitoring of the second activation signal or information indirectly instructing whether to perform monitoring of the second activation signal.

Base station apparatus and user equipment

The present invention is designed so that frequency bands can be used efficiently depending on what capabilities UEs have. According to one aspect of the present invention, a user terminal includes a receiving section that receives a synchronization signal block transmitted in part of frequency bands in a specific frequency band and a control section that, after random access procedures based on the synchronization signal block, controls transmission and/or receipt in a plurality of frequency bands in the specific frequency band based on a plurality of specific signals transmitted respectively in the plurality of frequency bands.

A terminal is disclosed that includes a transmitter that performs uplink (UL) transmission without a UL grant using a resource configured by higher layer signaling, a receiver that receives retransmission command information, which indicates a retransmission command for the UL transmission, and a processor that controls a resource used for retransmission of the UL transmission by units of symbols based on the retransmission command information. In other aspects, a base station and a radio communication method for a terminal are disclosed.

Growing community of inventors

Tokyo, Japan

Kazuaki Takeda