公开(公告)号：US20190190572A1

公开(公告)日：2019-06-20

申请号：US16322167

申请日：2017-08-02

Applicant: NTT DOCOMO, INC.

Inventor： Ryosuke Osawa ,  Hiroki Harada ,  Kazuki Takeda ,  Yuichi Kakishima

IPC: H04B7/0456 ,  H04B7/0404 ,  H04W72/04 ,  H04W80/02

CPC classification number: H04B7/0456 ,  H04B7/0404 ,  H04B7/0413 ,  H04J1/00 ,  H04L27/26 ,  H04W72/042 ,  H04W80/02

Abstract: The present invention is designed to improve the receiving characteristics of UL signals in multi-antenna transmission in the UL in future radio communication systems. According to the present invention, a user terminal has a transmission section that transmits an uplink (UL) signal, which is precoded per precoding group comprised of a predetermined number of frequency resource units, and a control section that controls the precoding of the UL signal. The control section controls the size of the precoding group in the frequency direction.

公开(公告)号：US20190123869A1

公开(公告)日：2019-04-25

申请号：US16090484

申请日：2017-03-31

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

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Chongning Na

IPC: H04L5/00

Abstract: A method of aperiodic signal transmission from a base station (BS) to a user equipment (UE) includes transmitting, from the BS to the UE, reservation information indicating first resources reserved for aperiodic signal transmission via higher layer signaling, transmitting, from the BS to the UE, Downlink Control Information (DCI) indicating at least a second resource to be selected based on the first resources, and transmitting, from the BS to the UE, the aperiodic signals using the first resources.

公开(公告)号：US20190013858A1

公开(公告)日：2019-01-10

申请号：US16075510

申请日：2017-02-03

Applicant: DOCOMO INNOCATIONS, INC. ,  NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Chongning Na

IPC: H04B7/06 ,  H04B7/0417 ,  H04L5/00

Abstract: A user equipment (UE) includes a receiver that receives multiple Reference Signals (RSs) transmitted using respectively different radio resources from a base station (BS), a processor that selects, out of RS Resource Indicators (RRIs) associated with the radio resources used for RS transmission, multiple RRIs, and a transmitter that transmits the multiple RRIs to the BS. The processor derives Channel State Information (CSI) in each of the RRIs using the RSs. The transmitter transmits the CSI corresponding to the multiple RRIs to the BS. The transmitter transmits the CSI corresponding to a part of the multiple RRIs. The transmitter transmits a RRI rank that indicates a number of the selected RRIs.

公开(公告)号：US20180270717A1

公开(公告)日：2018-09-20

申请号：US15762169

申请日：2016-09-23

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04W36/00 ,  H04B7/06 ,  H04W36/30 ,  H04B17/24 ,  H04B17/309 ,  H04W24/10

CPC classification number: H04W36/0083 ,  H04B7/0417 ,  H04B7/0617 ,  H04B7/0619 ,  H04B17/24 ,  H04B17/309 ,  H04W24/10 ,  H04W36/0085 ,  H04W36/30

Abstract: An embodiment of a radio base station is provided that comprises antennas at least one dimensionally arranged, a signal generation unit that generates a reference signal for channel measurement, a control unit that controls transmission of the reference signal in accordance with configurations using part or all of the antennas, the configurations including all or any of a horizontal relation, a vertical relation, and a cross-polarized relation, a handover control unit that controls a handover when a measurement report is received from a user terminal, a control signal generation unit that generates a control signal based on an instruction from the handover control unit, and a transmission unit that transmits the reference signal in accordance with the configurations based on output from the control unit.

公开(公告)号：US20170215107A1

公开(公告)日：2017-07-27

申请号：US15329602

申请日：2015-07-29

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W28/18 ,  H04W88/06 ,  H04W28/08 ,  H04W52/02 ,  H04W36/30 ,  H04W72/04

CPC classification number: H04W28/18 ,  H04W28/08 ,  H04W36/30 ,  H04W52/0216 ,  H04W52/146 ,  H04W52/32 ,  H04W52/34 ,  H04W72/04 ,  H04W72/042 ,  H04W88/06 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264

Abstract: The present invention is designed so that, even when a user terminal connects with a plurality of radio base stations by employing dual connectivity (DC), the deterioration of uplink communication quality can be reduced. A user terminal communicates with a first radio base station that configures a first cell group and a second radio base station that configures a second cell group, by using dual connectivity, and has a transmission section that transmits an UL signal and/or a UL channel that includes an SRS to each cell group, and a control section that controls the transmission power of the UL signal and/or the UL channel for each cell group, and the control section controls the transmission power of the UL signal and/or the UL channel for each cell group based on the guaranteed power that is configured in at least one of the cell groups.

公开(公告)号：US20170111873A1

公开(公告)日：2017-04-20

申请号：US15127210

申请日：2015-01-14

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Tooru Uchino ,  Kazuki Takeda ,  Satoshi Nagata ,  Hideaki Takahashi

IPC: H04W52/36 ,  H04W52/14 ,  H04W52/34

CPC classification number: H04W52/367 ,  H04L5/001 ,  H04L5/0035 ,  H04W52/143 ,  H04W52/146 ,  H04W52/16 ,  H04W52/34 ,  H04W52/346 ,  H04W52/365 ,  H04W76/15

Abstract: The present invention is designed to adequately execute transmission power control in dual connectivity (DC). A user terminal communicates with a plurality of cell groups, each cell group being comprised of one or more cells that use different frequencies, and has a power control section that controls the maximum transmission power value for each cell group, which is given by splitting the allowable maximum transmission power of the subject user terminal semi-statically, and controls the maximum transmission power value of a specific cell group to be changed when a predetermined condition is met, and a transmission section that reports the maximum transmission power value after the change to a radio base station forming the cell group.

公开(公告)号：US20170099092A1

公开(公告)日：2017-04-06

申请号：US15126075

申请日：2014-12-01

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Yoshihisa Kishiyama ,  Chongning Na

IPC: H04B7/06 ,  H04B7/04 ,  H04L5/00

CPC classification number: H04B7/0617 ,  H04B7/0413 ,  H04B7/0469 ,  H04B7/063 ,  H04B7/0632 ,  H04B7/0695 ,  H04L1/00 ,  H04L5/005 ,  H04W16/28 ,  H04W24/10 ,  H04W76/14 ,  H04W88/02 ,  H04W88/08

Abstract: The present disclosure relates to techniques for implementing efficient beam forming in 3D MIMO. One aspect of the present invention relates to abase station, comprising: a beam forming unit configured to form multiple directional beams in accordance with a predetermined beam arrangement; a transmission and reception unit configured to transmit reference signals in the formed multiple directional beams; and a feedback information acquisition unit configured to acquire feedback information from user equipment receiving the reference signals.

公开(公告)号：US20170006613A1

公开(公告)日：2017-01-05

申请号：US15125779

申请日：2014-12-01

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Yoshihisa Kishiyama

IPC: H04W72/08 ,  H04B7/04 ,  H04L5/00 ,  H04W76/02 ,  H04W16/28 ,  H04W24/08

CPC classification number: H04W72/082 ,  H04B7/024 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0695 ,  H04L5/0048 ,  H04W16/28 ,  H04W24/08 ,  H04W76/14

Abstract: The present disclosure relates to techniques for reducing flash light effect in 3D MIMO. One aspect of the present invention relates to user equipment, comprising: a transmission and reception unit configured to receive an interference beam candidate list including directional beams transmitted from a camped base station and interference beam candidates transmitted from an adjacent base station; a measurement unit configured to measure reception quality of reference signals transmitted in the respective directional beams in the received interference beam candidate list; and an interference information generation unit configured to generate interference information based on the measured reception quality, wherein the transmission and reception unit indicates the generated interference information to the camped base station or the adjacent base station.

Abstract translation: 本公开涉及用于降低3D MIMO中的闪光灯效应的技术。 本发明的一个方面涉及用户设备，包括：发送和接收单元，被配置为接收干扰波束候选列表，该干扰波束候选列表包括从驻留基站发射的定向波束和从相邻基站发送的干扰波束候选; 测量单元，被配置为测量在所接收的干扰波束候选列表中的各个定向波束中发送的参考信号的接收质量; 以及干扰信息生成单元，被配置为基于所测量的接收质量生成干扰信息，其中所述发送和接收单元向所述驻留基站或相邻基站指示所生成的干扰信息。

公开(公告)号：US20160337867A1

公开(公告)日：2016-11-17

申请号：US15110895

申请日：2015-03-09

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Kazuki Takeda ,  Yuichi Kakishima ,  Hiroki Harada

IPC: H04W16/14 ,  H04W72/04

CPC classification number: H04W16/14 ,  H04L1/1896 ,  H04W52/146 ,  H04W52/248 ,  H04W72/0413 ,  H04W72/0453 ,  H04W74/0808

Abstract: A mobile station which communicates with a base station using an unlicensed band includes a resource management unit configured to manage information about an uplink transmission resource allocated by the base station; a transmission detection unit configured to detect whether transmission in the unlicensed band is possible before arrival of the allocated uplink transmission resource; and a transmission unit configured to transmit an uplink signal on the allocated uplink transmission resource, when transmission in the unlicensed band is possible.

Abstract translation: 使用非许可频带与基站进行通信的移动台包括资源管理单元，被配置为管理由所述基站分配的上行链路传输资源的信息; 发送检测单元，被配置为检测在所分配的上行链路传输资源到达之前是否可能在非许可频带中的传输; 以及发送单元，被配置为当所述非许可频带中的发送是可能时，在所分配的上行链路传输资源上发送上行链路信号。

公开(公告)号：US20160242127A1

公开(公告)日：2016-08-18

申请号：US15024745

申请日：2014-09-16

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Yuichi Kakishima ,  Tooru Uchino ,  Hideaki Takahashi

IPC: H04W52/36 ,  H04W72/04

CPC classification number: H04W52/365 ,  H04B7/024 ,  H04W72/04 ,  H04W72/1284

Abstract: The present invention is designed to enable adequate transmission power control when inter-base station CA is employed. When inter-base station CA is employed, radio base stations detect when a user terminal's transmission power reaches the maximum transmission power, and execute control to cancel this. For example, a user terminal has a transmission section that transmits an uplink physical channel to each component carrier, a power headroom generating section that generates power headroom, which is extra transmission power of the subject terminal, and a control section that, when the value of the power headroom becomes 0 or less, executes control so that the power headroom is triggered and reported to the radio base stations.

Abstract translation: 本发明被设计成当采用基站间CA时能够进行适当的发送功率控制。 当采用基站间CA时，无线基站检测用户终端的发送功率何时达到最大发送功率，并执行控制取消。 例如，用户终端具有向每个分量载波发送上行物理信道的发送部，产生作为本终端的附加发送功率的功率余量的功率余量生成部，以及控制部， 功率余量变为0以下，执行控制，使得功率余量被触发并向无线基站报告。