公开(公告)号：US09999006B2

公开(公告)日：2018-06-12

申请号：US15303163

申请日：2015-09-24

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Kazuki Takeda ,  Hideaki Takahashi

IPC: H04W52/36 ,  H04W72/04 ,  H04W52/34 ,  H04W88/02 ,  H04W88/08 ,  H04W76/02 ,  H04W52/14

CPC classification number: H04W52/365 ,  H04W52/146 ,  H04W52/34 ,  H04W72/0413 ,  H04W76/15 ,  H04W88/02 ,  H04W88/08

Abstract: A user apparatus in a mobile communication system includes a first and second base station that perform communication with the user apparatus by inter-base station carrier aggregation. The user apparatus receives, from the first base station, a first detection parameter on uplink transmission power reporting set for a first cell group that is a cell group of the first base station. The user apparatus also receives a second detection parameter on uplink transmission power reporting set for a second cell group that is a cell group of the second base station. The user apparatus reports uplink transmission power information to one of or both of the first and second base station when detecting a report trigger of the uplink transmission power information in a cell group of the first and second cell group by a detection parameter of the first and second detection parameter.

公开(公告)号：US20180160375A1

公开(公告)日：2018-06-07

申请号：US15873525

申请日：2018-01-17

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Kunihiko Teshima ,  Tooru Uchino ,  Kei Andou

IPC: H04W52/14 ,  H04W52/40 ,  H04W52/26 ,  H04W52/36 ,  H04W52/16 ,  H04W52/30 ,  H04W72/04

CPC classification number: H04W52/146 ,  H04W52/16 ,  H04W52/267 ,  H04W52/30 ,  H04W52/34 ,  H04W52/36 ,  H04W52/367 ,  H04W52/40 ,  H04W72/04 ,  H04W76/15

Abstract: A user terminal is disclosed that connects with a plurality of radio base stations and the decrease of uplink throughput is reduced. A user terminal connects with a plurality of radio base stations including a first radio base station and a second radio base station, and this user terminal has a transmission section that transmits uplink signals to each radio base station, a receiving section that receives terminal-specific information with respect to the first radio base station, related to the maximum transmission power of the uplink signals, and a maximum transmission power setting section that sets the maximum transmission power for the first radio base station based on the terminal-specific information with respect to the first radio base station.

公开(公告)号：US20180145815A1

公开(公告)日：2018-05-24

申请号：US15854457

申请日：2017-12-26

Applicant: NTT DOCOMO, INC.

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

IPC: H04L5/00 ,  H04L1/16 ,  H04W72/04 ,  H04W72/12

Abstract: A user terminal is disclosed including a transmitter that transmits delivery acknowledgment signals (ACK/NACK) in response to downlink (DL) signals transmitted from a plurality of cells, a receiver that receives information about cells to be scheduled, and a processor that controls transmission of the ACK/NACK based on the information about the cells to be scheduled. Further, a radio base station is disclosed that communicates with a user terminal using a plurality cells, the radio base station including a processor that controls scheduling of downlink (DL) signals transmitted respectively from the plurality of cells; a transmitter that transmits information about cells to be scheduled; and a receiver that receives delivery acknowledgement signals (ACK/NACK) transmitted from the user terminal based on the information about the cells to be scheduled.

公开(公告)号：US20180139705A1

公开(公告)日：2018-05-17

申请号：US15563679

申请日：2016-03-18

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Tooru Uchino ,  Satoshi Nagata ,  Lihui Wang ,  Liu Liu ,  Huiling Jiang

IPC: H04W52/36 ,  H04W72/04 ,  H04W52/34 ,  H04W16/02

CPC classification number: H04W52/365 ,  H04W16/02 ,  H04W52/34 ,  H04W72/04 ,  H04W72/042 ,  H04W72/0453

Abstract: To carry out communications appropriately even if the number of component carriers settable to a user terminal is extended from the existing system. The user terminal according to one embodiment of the present invention is a user terminal which can communicate using a plurality of component carriers (CCs), which contains a generator unit which generates a power headroom report (PHR) including information about a power headroom (PH) for each of CCs of a predetermined cell group among activated CCs and a transmission unit which transmits the generated PHR.

公开(公告)号：US20180139020A1

公开(公告)日：2018-05-17

申请号：US15572817

申请日：2016-05-13

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Lihui Wang ,  Liu Liu ,  Huiling Jiang

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

Abstract: The present invention is designed so that communication can be carries out adequately even when the number of component carriers that can be configured in a user terminal is expanded from that in existing systems. According to one aspect of the present invention, a user terminal communicates by using a plurality of component carriers (CCs), and has a data buffering section that stores uplink data, a generating section that generates a BSR MAC CE (Medium Access Control Control Element), in which a given index corresponding to a buffer size is included, based on BSR (Buffer Status Report) tables, in which amounts of uplink data that is stored (buffer sizes) and indices are associated, and a transmission section that transmits the BSR MAC CE, and one of the BSR tables is a first BSR table for use when more than five CCs are configured in the user terminal.

公开(公告)号：US20180132260A1

公开(公告)日：2018-05-10

申请号：US15571511

申请日：2016-08-05

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W72/12

CPC classification number: H04W72/1226 ,  H04W16/14 ,  H04W72/0446 ,  H04W72/1215 ,  H04W72/1268 ,  H04W72/1278 ,  H04W74/0808

Abstract: The present invention is designed to adequately control UL transmission in cells (for example, unlicensed bands) where listening is executed prior to transmission cell. The present invention provides a transmission section that transmits a UL signal, and a control section that controls the transmission of the UL signal based on a UL transmission command that is reported from a radio base station and based on listening that is executed before the UL signal is transmitted, and, when support is provided to transmit a DL signal and/or a UL signal from the middle of a subframe based on the result of listening, the control section transmits the UL signal in a second period, which is configured a first period after the UL transmission command is received.

公开(公告)号：US20180020445A1

公开(公告)日：2018-01-18

申请号：US15548460

申请日：2016-02-19

Applicant: NTT DOCOMO, INC.

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

IPC: H04W72/04 ,  H04L1/18 ,  H04W72/14 ,  H04W52/36 ,  H04W88/08 ,  H04W88/02

Abstract: The present invention is designed to allow adequate communication even when the number of CCs that can be configured in a user terminal is expanded from that of existing systems and/or when CA is executed using unlicensed CCs. A user terminal communicates with a radio base station by means of carrier aggregation using a plurality of component carriers (CCs), and has a receiving section that receives DL signals transmitted from each CC, a transmission section that transmits UL signals, and a control section that controls transmission operations in the transmission section, and, when a plurality of CCs, including at least a first CC, which corresponds to a primary CC of an existing system, and a third CC, which is different from the first CC and a second CC that corresponds to a secondary CC of the existing system, are configured, the control section applies, to the third CC, UL signal transmission operations that are different from those of the second CC.

公开(公告)号：US20170373914A1

公开(公告)日：2017-12-28

申请号：US15543586

申请日：2016-01-20

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04L29/06 ,  H04J1/06 ,  H04J11/00 ,  H04W16/14

CPC classification number: H04L29/06013 ,  H04J1/00 ,  H04J1/065 ,  H04J11/00 ,  H04J11/0023 ,  H04J11/0069 ,  H04L27/0006 ,  H04W16/14 ,  H04W72/08 ,  H04W74/0808

Abstract: The present invention is designed to improve spectral efficiency in a system that runs LTE/LTE-A by using a carrier in which LBT (Listen Before Talk) is configured. One aspect of the present invention provides a radio base station in a radio communication system where the radio base station and a user terminal communicate by using a carrier in which LBT is configured, and this radio base station has a measurement section that executes LBT in a predetermined carrier sensing duration and acquires an LBT result, and a transmission section that transmits a downlink signal based on the LBT result, and the predetermined carrier sensing duration includes a first carrier sensing duration and a second carrier sensing duration, which is shorter than the first carrier sensing duration.

公开(公告)号：US20170353272A1

公开(公告)日：2017-12-07

申请号：US15524777

申请日：2015-10-21

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Shimpei Yasukawa ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04L1/16 ,  H04W72/04 ,  H04W72/12

CPC classification number: H04L1/16 ,  H04L5/0048 ,  H04L5/0055 ,  H04W72/042 ,  H04W72/0453 ,  H04W72/1268

Abstract: The present invention is designed so that the efficiency of use of UL resources is prevented from decreasing even when the band to use is limited to partial narrow bands in the system band. According to one aspect of the present invention, a user terminal, in which the band to use is limited to partial narrow bands in the system band, has a receiving section that receives downlink control information that relates to a resource to allocate to a PDSCH (Physical Downlink Shared Channel), in an EPDCCH (Enhanced Physical Downlink Control Channel), and receives the PDSCH based on the downlink control information, a transmission section that transmits a PUCCH (Physical Uplink Control Channel) in response to the PDSCH, and a control section that controls a PUCCH resource based on a PRB (Physical Resource Block) index that corresponds to the PDSCH.

公开(公告)号：US09826462B2

公开(公告)日：2017-11-21

申请号：US15032692

申请日：2014-10-22

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W48/08 ,  H04W8/00 ,  H04W72/04 ,  H04W92/18

CPC classification number: H04W48/08 ,  H04W8/005 ,  H04W72/042 ,  H04W72/0426 ,  H04W72/044 ,  H04W92/18

Abstract: The present invention is designed so that adequate mutual detection is made possible in non-collision-type D2D discovery during inter-terminal direct communication. A user terminal can execute inter-terminal direct communication, and has a receiving section that receives initial allocation location information of a resource for transmitting a discovery signal for use in inter-terminal direct communication, and a control section that switches the location of the resource to transmit the discovery signal, per period, in accordance with a pre-rule.