公开(公告)号：US20150282102A1

公开(公告)日：2015-10-01

申请号：US14431529

申请日：2013-08-16

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Kazuaki Takeda ,  Yoshihisa Kishiyama

IPC: H04W52/32 ,  H04L27/26 ,  H04W52/34 ,  H04W72/04

CPC classification number: H04W72/0413 ,  H04L27/2601 ,  H04W52/146 ,  H04W52/16 ,  H04W52/32 ,  H04W52/325 ,  H04W52/343 ,  H04W52/346 ,  H04W52/40 ,  H04W56/00 ,  H04W72/0453 ,  H04W88/02 ,  H04W88/08

Abstract: The present invention is designed to make it possible to apply power scaling to a period where the upper limit value is exceeded, while maintaining uplink transmission quality. In a radio communication system 1 in which multiple cells (C1 and C2) are formed, a base station apparatus (20) forms a first cell C1, which is one of the multiple cells, and has a control section (234) that controls uplink transmission times per timing group, which includes one component carrier or a plurality of component carriers, and a transmission section (106) that signals a timing group or a component carrier determined as a target of power scaling, as power scaling target information, in which the timing group or the component carrier, to which power scaling is applied, is expressly determined, to a the user terminal (10).

Abstract translation: 本发明被设计为使得可以在保持上行链路传输质量的同时将功率缩放应用于超过上限值的时段。 在形成有多个小区（C1，C2）的无线通信系统1中，基站装置（20）形成作为多个小区之一的第一小区C1，具有控制上行链路的控制部（234） 包括单分量载波或多个分量载波的每个定时组的传输时间，以及将确定为功率缩放的目标的定时组或分量载波作为功率缩放目标信息发送的传输部分（106），其中 向用户终端（10）明确地确定应用功率缩放的定时组或分量载波。

公开(公告)号：US12184351B2

公开(公告)日：2024-12-31

申请号：US17459428

申请日：2021-08-27

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Satoshi Nagata ,  Chongning Na ,  Xin Wang ,  Huiling Jiang ,  Yuichi Kakishima

IPC: H04B17/345 ,  H04W24/08 ,  H04W72/23 ,  H04W84/04 ,  H04W88/02

Abstract: 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.

公开(公告)号：US12167355B2

公开(公告)日：2024-12-10

申请号：US17755472

申请日：2019-11-07

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Yuki Matsumura ,  Syouichi Higuchi

IPC: H04W56/00 ,  H04L5/00

Abstract: A terminal includes a receiving unit configured to receive information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information relating to the arrangement of the tracking reference signal, and a controller configured to perform a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals in a time domain is variable.

公开(公告)号：US12063603B2

公开(公告)日：2024-08-13

申请号：US17257885

申请日：2018-07-09

Applicant: NTT DOCOMO, INC.

Inventor： Ryosuke Osawa ,  Yuichi Kakishima ,  Huan Wang

IPC: H04W56/00 ,  H04L5/00 ,  H04W24/10 ,  H04W72/12

CPC classification number: H04W56/001 ,  H04L5/0048 ,  H04W24/10 ,  H04W72/12

Abstract: A user equipment communicates with a first user equipment or a base station apparatus, the user equipment including a receiving unit configured to receive a synchronization signal or a reference signal used in sidelink transmitted from the first user equipment; a control unit configured to measure a channel state of sidelink, based on the synchronization signal or the reference signal; and a transmitting unit configured to transmit, to the base station apparatus or the first user equipment, information indicating the channel state of sidelink.

公开(公告)号：US11902069B2

公开(公告)日：2024-02-13

申请号：US17627970

申请日：2019-08-02

Applicant: NTT DOCOMO, INC.

Inventor： Yuki Matsumura ,  Yuichi Kakishima ,  Satoshi Nagata

IPC: H04L27/26 ,  H04L5/00 ,  H04J13/00

CPC classification number: H04L27/2613 ,  H04J13/004 ,  H04L5/0016 ,  H04L5/0051

Abstract: A terminal according to one aspect of the present disclosure includes: a control section that assumes that a frequency domain orthogonal cover code (FD-OCC) having a sequence length of a number larger than two is applied to a demodulation reference signal mapped to a pair of resource elements the number of which is greater than two and that are being different in frequency; and a transmitting/receiving section that performs transmission processing or reception processing of the demodulation reference signal, based on the FD-OCC. According to one aspect of the present disclosure, even when there are terminals according to different releases, each of the terminals can appropriately perform communication.

公开(公告)号：US20230354048A1

公开(公告)日：2023-11-02

申请号：US17759153

申请日：2020-02-13

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Hiroki Harada

IPC: H04W16/14

CPC classification number: H04W16/14

Abstract: A terminal includes a reception unit configured to receive a reference signal of a first RAT (Radio Access Technology) and a data signal of a second RAT; and a control unit configured to decode the data signal based on precoder information applied to the reference signal and to the data signal.

公开(公告)号：US11723058B2

公开(公告)日：2023-08-08

申请号：US16622709

申请日：2018-06-14

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata

IPC: H04W72/08 ,  H04W72/542 ,  H04B17/336 ,  H04L1/00 ,  H04L5/00 ,  H04L25/02 ,  H04W24/10 ,  H04W72/0453 ,  H04W72/541

CPC classification number: H04W72/542 ,  H04B17/336 ,  H04L1/0026 ,  H04L5/0051 ,  H04L25/0226 ,  H04W24/10 ,  H04W72/0453 ,  H04W72/541

Abstract: A method of frequency resource allocation for Channel State Information Reference Signal (CSI-RS) in a wireless communication system includes transmitting, from a base station (BS) to a user equipment (UE), a CSI-RS using a CSI-RS resource, calculating, with the UE, CSI based on the CSI-RS, and reporting, from the UE to the BS, the CSI. The CSI-RS resource in a frequency domain is allocated to one or more frequency resources that are part of a carrier bandwidth. The method further includes notifying, with the BS, the UE of a location of the one or more frequency resources in the frequency domain.

公开(公告)号：US11533099B2

公开(公告)日：2022-12-20

申请号：US16324874

申请日：2017-08-11

Applicant: DONOMO INNOVATIONS, INC. ,  NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata

IPC: H04B7/08 ,  H04B7/06 ,  H04B7/0408 ,  H04B17/309

Abstract: A method of selecting a reception resource of a user equipment (UE) includes receiving, with the UE, multiple predetermined signals from a base station (BS) using multiple reception resources, measuring, with the UE, reception quality of the predetermined signals, and selecting, with the UE, at reception resource used for reception of a downlink signal from the multiple reception resources based on the measured reception quality. The method further includes receiving, with the UE, the downlink signal using the selected reception resource. The selecting selects the reception resource used for reception of the predetermined signal of which reception quality is higher than reception quality of the other predetermined signals.

公开(公告)号：US20220400456A1

公开(公告)日：2022-12-15

申请号：US17755472

申请日：2019-11-07

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Yuki Matsumura ,  Syouichi Higuchi

IPC: H04W56/00 ,  H04L5/00

Abstract: A terminal includes a receiving unit configured to receive information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information relating to the arrangement of the tracking reference signal, and a controller configured to perform a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals in a time domain is variable.

公开(公告)号：US20220368380A1

公开(公告)日：2022-11-17

申请号：US17633866

申请日：2019-08-15

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Yuki Matsumura ,  Satoshi Nagata

IPC: H04B7/0452 ,  H04L5/00 ,  H04W16/28

Abstract: A terminal includes a reception unit configured to receive information associated with a signal transmitted to an apparatus other than the terminal, in MU-MIMO (MultiUser-Multiple Input Multiple Output) and a reference signal from a base station, a control unit configured to estimate interference from the signal transmitted to the apparatus other than the terminal to a signal transmitted to the terminal, based on the information associated with the signal transmitted to the apparatus other than the terminal and the reference signal, and a communication unit configured to suppress the interference and receive a data signal from the base station.