公开(公告)号：US20190013985A1

公开(公告)日：2019-01-10

申请号：US15753686

申请日：2016-08-19

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04L27/26 ,  H04W72/04 ,  H04W56/00 ,  H04L1/00 ,  H04W28/02

CPC classification number: H04W72/0453 ,  H04W28/0215 ,  H04W56/00 ,  H04W56/0015 ,  H04W72/04 ,  H04W72/048

Abstract: The present invention is designed so that synchronization can be adequately established even when a band to use is limited to a narrow band than the minimum system bandwidth (1.4 MHz) that is supported in existing LTE. According to one aspect of the present invention, a user terminal, in which a band to use is limited to a narrower band than the minimum system bandwidth supported in an existing LTE (Long Term Evolution) system, has a receiving section that receives a signal that is divided into a plurality of periods and transmitted, in a predetermined narrow band that overlaps a frequency band in which an existing synchronization signal is transmitted, and a control section that performs a synchronization process by identifying the signal that is divided into the plurality of periods and transmitted as being a synchronization signal that is generated by using a predetermined sequence, wherein the signal that is transmitted in at least one period in the plurality of periods is a portion of the existing synchronization signal.

公开(公告)号：US20190007931A1

公开(公告)日：2019-01-03

申请号：US15752365

申请日：2016-08-09

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W72/04 ,  H04L5/00 ,  H04W48/08

Abstract: The present invention is designed to carry out communication adequately in cells (for example, unlicensed bands) where listening is executed prior to transmission. The present invention provides a transmission section that transmits a discovery measurement signal including first reference signals for channel state measurement, based on the result of listening, and a control section that controls resource allocation of the discovery measurement signal, and the control section assigns the first reference signals to be extended greater in a direction of time than existing second reference signals for channel state measurement.

公开(公告)号：US20180332612A1

公开(公告)日：2018-11-15

申请号：US15755908

申请日：2016-08-22

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04W72/14 ,  H04L5/00

CPC classification number: H04W72/14 ,  H04J1/00 ,  H04J11/00 ,  H04L5/0044 ,  H04L5/0055 ,  H04W28/04 ,  H04W72/04 ,  H04W72/12

Abstract: According to the present invention, low-latency communication in a next-generation mobile communication system can be achieved. A user terminal includes a receiving section configured to receive at least one piece of downlink control information out of first downlink control information that schedules reception of downlink data and second downlink control information that schedules transmission of uplink data; and a control section configured to perform a control to carry out communication using a transmission time interval (TTI) configuration, including an allocation section for receiving the downlink control information, a data section for carrying out reception of downlink data corresponding to the received downlink control information and/or transmission of uplink data, and a delivery acknowledgement section for carrying out reception and/or transmission of delivery acknowledgement information corresponding to predetermined data.

公开(公告)号：US10097983B2

公开(公告)日：2018-10-09

申请号：US15032340

申请日：2014-10-22

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W8/00 ,  H04L5/00 ,  H04W72/04 ,  H04W92/18

Abstract: The present invention is designed to prevent producing inter-symbol interference against normal uplink communication in collision-type D2D discovery during inter-terminal direct communication. A radio base station can communicate with a user terminal that can execute inter-terminal direct communication, and has a control section that configures a D2D discovery resource area by allocating a type 2 discovery resource area immediately after a type 1 discovery resource area in a row, and a transmission section that transmits allocation information of the D2D discovery resource area.

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：US20180255550A1

公开(公告)日：2018-09-06

申请号：US15756731

申请日：2016-08-31

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W72/04 ,  H04L5/00 ,  H04L27/26 ,  H04W48/16

CPC classification number: H04W72/0446 ,  H04J11/00 ,  H04L5/0053 ,  H04L5/0078 ,  H04L5/0094 ,  H04L27/2613 ,  H04W28/06 ,  H04W48/16 ,  H04W72/04 ,  H04W72/042

Abstract: Disclosed is to properly perform communications even in an environment enabled to use different TTI lengths in combination. User equipment in one aspect of the present invention includes: a control unit that specifies a configuration of a plurality of transmission time intervals (TTI: Transmission Time Interval) contained in one subframe of an existing system; and a reception unit that receives downlink control information at a radio resource receiving allocation of PDCCH (Physical Downlink Control Channel) of the existing system or at a first TTI of the plural TTIs, and receives data at, at least, one of the plural TTIs on the basis of the downlink control information.

公开(公告)号：US20180242354A1

公开(公告)日：2018-08-23

申请号：US15753730

申请日：2016-08-19

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Kazuaki Takeda ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04W74/00 ,  H04W74/08 ,  H04W72/04 ,  H04W74/04

CPC classification number: H04W74/004 ,  H04W72/0446 ,  H04W74/04 ,  H04W74/0833 ,  H04W76/10

Abstract: This invention aims to appropriately perform random access even when a shortened TTI is used. A user terminal includes a control section which controls communication using cells including at least two cells having different TTIs (Transmission Time Intervals), a transmission section which transmits a random access preamble, and a reception section which receives a response signal to the random access preamble, wherein the control section performs control to receive in a second cell, the response signal to the random access preamble transmitted in a first cell.

公开(公告)号：US20180242316A1

公开(公告)日：2018-08-23

申请号：US15753429

申请日：2016-08-19

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Tooru Uchino ,  Kazuaki Takeda ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04W72/04 ,  H04L5/00

Abstract: Disclosed is to properly perform communications even in the coexistence of shortened TTIs and normal TTIs. User equipment performing communications by using a plurality of CCs (Component Carriers) including at least two CCs having different TTI (Transmission Time Interval) lengths, includes: a receiving section receiving downlink control information in a first CC and a control section controlling the communication in a second CC different from the first CC, based on the downlink control information.

公开(公告)号：US10009828B2

公开(公告)日：2018-06-26

申请号：US15032720

申请日：2014-10-16

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Yongbo Zeng ,  Qun Zhao ,  Yongsheng Zhang

IPC: H04W40/24 ,  H04J11/00 ,  H04L27/10 ,  H04L27/34 ,  H04L29/06 ,  H04L5/00 ,  H04W72/12 ,  H04W8/00 ,  H04W88/06

CPC classification number: H04W40/244 ,  H04J11/00 ,  H04J11/0056 ,  H04L5/0048 ,  H04L5/005 ,  H04L27/10 ,  H04L27/34 ,  H04L69/22 ,  H04W8/005 ,  H04W40/246 ,  H04W72/1215 ,  H04W72/1263 ,  H04W88/06

Abstract: The present invention is designed so that, when a plurality of inter-terminal discovery signals with varying numbers of information bits are used in a radio communication system in which inter-terminal communication is carried out, user terminals can be discovered based on the inter-terminal discovery signals. According to the inter-terminal communication method of the present invention, a user terminal (#1) determines the signal format of a discovery signal based on the number of information bits of the discovery signal,transmits the discovery signal based on the signal format, and also transmits signal format information to represent this signal format. A user terminal (#2) receives the signal format information from the user terminal (#1), and, based on the signal format represented by the signal format information, detects the discovery signal.

公开(公告)号：US20180176943A1

公开(公告)日：2018-06-21

申请号：US15738356

申请日：2016-06-24

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Satoshi Nagata ,  Tooru Uchino

IPC: H04W72/12 ,  H04W72/04 ,  H04L5/00 ,  H04W52/04

CPC classification number: H04W72/1289 ,  H04L1/1861 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0055 ,  H04W52/04 ,  H04W72/04 ,  H04W72/0413

Abstract: A user terminal includes: a reception section that detects instruction information of a reception of a downlink shared channel on a downlink control channel; a transmission section that transmits uplink control information on the reception of the downlink shared channel corresponding to the instruction information; and a control section that determines a PUCCH (Physical Uplink Control Channel) format for transmitting the uplink control information from a plurality of PUCCH formats including a large-capacity PUCCH format having a larger capacity than PUCCH format 3. The control section determines a PUCCH resource for transmission with the large-capacity PUCCH format based on the instruction information.