公开(公告)号：US20190116489A1

公开(公告)日：2019-04-18

申请号：US16088302

申请日：2017-03-30

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Liu Liu ,  Lihui Wang ,  Huiling Jiang

IPC: H04W8/22 ,  H04W16/14 ,  H04W74/08 ,  H04W72/14 ,  H04W72/04

Abstract: The present invention is designed to suitably realize UCI (Uplink Control Information) transmission at a desired timing in a carrier where LBT (Listen Before Talk) is configured. A user terminal, according to one embodiment of the present invention, has a transmission section that transmits signals in carriers where listening is performed before uplink transmission, a receiving section that receives PUCCH cell configuration information as to whether or not at least one of the carriers is a cell where a PUCCH (Physical Uplink Control Channel) is transmitted, and a control section that controls the transmission of uplink control information (UCI) in the carriers based on the PUCCH cell configuration information.

公开(公告)号：US20190058515A1

公开(公告)日：2019-02-21

申请号：US15761562

申请日：2016-09-09

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Yu Jiang ,  Liu Liu ,  Huiling Jiang

IPC: H04B7/06 ,  H04J11/00 ,  H04W24/10 ,  H04W16/14 ,  H04L5/00

Abstract: The present disclosure is designed to carry out cell search and/or Radio Resource Management (RRM) measurements accurately even in carriers in which Listen Before Talk (LBT) is configured. According one example of the present disclosure, a user terminal communicates by using a cell in which listening is executed before signal are transmitted, and has a receiving section that receives a detection/measurement signal including a first synchronization signal and a second synchronization signal, and a measurement section that carries out measurements by using a channel state measurement reference signal, which is included in the detection/measurement signal, and which is frequency-multiplexed with the first synchronization signal and/or the second synchronization signal.

公开(公告)号：US10154430B2

公开(公告)日：2018-12-11

申请号：US15325615

申请日：2015-06-24

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata ,  Mingju Li ,  Jing Wang ,  Yu Jiang ,  Liu Liu ,  Huiling Jiang

IPC: H04W16/14 ,  H04W24/10 ,  H04W36/00 ,  H04W48/16 ,  H04W72/14 ,  H04W74/00 ,  H04W74/08 ,  H04W84/12 ,  H04B17/318

Abstract: In order to prevent, in an LAA system supporting LBT, reduction in resource usage of the system, the present invention provides a radio base station that communicates with a user terminal capable of using a licensed band and unlicensed band. The radio base station comprises: an obtaining section that obtains information about an available time resource amount that is determined based on a result of LBT (Listen Before Talk) in the unlicensed band; and a control section that controls communication with the user terminal in the unlicensed band based on the information about the available time resource amount.

公开(公告)号：US20180323907A1

公开(公告)日：2018-11-08

申请号：US15773287

申请日：2016-11-04

Applicant: NTT DOCOMO, INC.

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

IPC: H04L1/18 ,  H04W72/12

CPC classification number: H04L1/1812 ,  H04L1/1861 ,  H04L1/1864 ,  H04L1/1887 ,  H04L5/0055 ,  H04L5/14 ,  H04W28/04 ,  H04W28/06 ,  H04W72/04 ,  H04W72/12

Abstract: A user terminal includes: a transmitter that transmits delivery acknowledgement signals (HARQ-ACKs); a receiver that receives downlink control information including: in one or more predetermined subframes of the downlink control information, first information that indicates a total number of cells to be subjected to downlink (DL) transmission scheduling, and second information that indicates a cumulative number of cells; and a processor that performs control so that the HARQ-ACKs are transmitted in predetermined uplink (UL) subframes based on the first information and the second information. The HARQ-ACKs are transmitted in response to DL signals transmitted from a plurality of cells. The plurality of cells include cells that use Time Division Duplex (TDD). A value of the first information is the same in each of the one or more predetermined subframes, and the processor updates the first information on a per subframe basis.

公开(公告)号：US20180279366A1

公开(公告)日：2018-09-27

申请号：US15761518

申请日：2016-09-09

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Jing Wang ,  Liu Liu ,  Huiling Jiang

IPC: H04W74/08 ,  H04W16/14 ,  H04W72/12 ,  H04W72/04

CPC classification number: H04W74/0808 ,  H04W16/14 ,  H04W72/0446 ,  H04W72/121 ,  H04W72/1268

Abstract: The present invention is designed so that UL signals of a plurality of user terminals can be multiplexed and communicated in cells where listening is employed (for example, unlicensed bands). According to the present invention, a user terminal communicates with a radio base station in a cell where listening is executed before uplink (UL) signals are transmitted, and has a transmission section that transmits UL signals, and a control section that controls the transmission of UL signals based on the result of listening. The control section makes the listening period for executing listening and the transmission period for transmitting UL signals the same among a plurality of user terminals that are scheduled in the same subframe.

公开(公告)号：US20180212718A1

公开(公告)日：2018-07-26

申请号：US15934038

申请日：2018-03-23

Applicant: NTT DOCOMO, INC.

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

IPC: H04L1/18 ,  H04W72/04 ,  H04L5/00

CPC classification number: H04L1/1816 ,  H04L1/1854 ,  H04L1/1861 ,  H04L5/0057 ,  H04W24/10 ,  H04W28/06 ,  H04W72/04 ,  H04W72/0413

Abstract: A user terminal is disclosed. The user terminal has a transmitter that transmits uplink control information (UCI) and a processor executes control to transmit at least a part of the UCI by using a specific Physical Uplink Control Channel (PUCCH) format (PF). When the UCI includes multiple periodic channel state information (P-CSI) and multiple Hybrid Automatic Repeat reQuest Acknowledgments (HARQ-ACKs), the processor controls to transmit the UCI by using a resource designated by downlink control information and a second PF having a greater capacity than PF.

公开(公告)号：US20180146455A1

公开(公告)日：2018-05-24

申请号：US15563690

申请日：2016-04-08

Applicant: NTT DOCOMO, INC.

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

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

CPC classification number: H04W72/042 ,  H04L5/001 ,  H04L5/0053 ,  H04L5/0055 ,  H04W16/14 ,  H04W72/0453 ,  H04W72/1273 ,  H04W72/1289

Abstract: The present invention is designed so that it is possible to increase the EPDCCH capacity for transmitting control information that is required in cross-carrier scheduling in enhanced carrier aggregation. A user terminal can communicate with a radio base station using six or more component carriers, and has a control section that exerts control so that, based on one or a plurality of EPDCCH (Enhanced Physical Downlink Control Channel) groups configured by the radio base station, and component carrier indices corresponding to each EPDCCH set group, blind decoding is performed on EPDCCH sets included in the EPDCCH set groups, and DCI (Downlink Control Information) of component carriers corresponding to the EPDCCH set groups is detected.

公开(公告)号：US09893863B2

公开(公告)日：2018-02-13

申请号：US14416186

申请日：2013-07-22

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Satoshi Nagata ,  Yoshihisa Kishiyama ,  Qin Mu ,  Liu Liu ,  Lan Chen

IPC: H04L5/00 ,  H04W72/04 ,  H04L1/00 ,  H04B7/0452 ,  H04W28/06

CPC classification number: H04L5/0055 ,  H04B7/0452 ,  H04L1/00 ,  H04W28/06 ,  H04W72/042

Abstract: A system and method for allocating adequate uplink radio resources for delivery acknowledgement information of a downlink shared data channel when downlink control information is transmitted using an enhanced downlink control channel is disclosed. A radio base station configures a plurality of enhanced PDCCH sets, which are each formed to include a plurality of enhanced control channel elements (eCCEs) allocated to the enhanced downlink control channel, for a user terminal, the radio base station transmits, to the user terminal, the downlink control information, to which resource identifiers (ARIs) are added, the resource identifiers being different between the plurality of enhanced PDCCH sets, and the user terminal determines radio resources for an uplink control channel that are used to transmit delivery acknowledgment information of the downlink shared data channel, based on offset values that are associated with the resource identifiers (ARIs).

公开(公告)号：US09888520B2

公开(公告)日：2018-02-06

申请号：US14909316

申请日：2014-07-08

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Liu Liu ,  Lan Chen

IPC: H04W76/04 ,  H04W16/32 ,  H04W36/00 ,  H04W52/02 ,  H04W16/16 ,  H04W48/16

CPC classification number: H04W76/28 ,  H04W16/16 ,  H04W16/32 ,  H04W36/00 ,  H04W48/16 ,  H04W52/0216 ,  H04W52/0219 ,  H04W92/20 ,  Y02B70/30 ,  Y02D70/00 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/24

Abstract: The present invention is designed to allow more reliable small cell detection while preventing the increase of power consumption in user terminals. The communication control method of the present invention includes the steps in which a radio base station that forms a macro cell and/or a small cell notifies a user terminal of transmission configuration information of a detection/measurement signal that is transmitted from the small cell, and discontinuous reception information including a discontinuous reception cycle in the user terminal, and the user terminal configures a detection duration for detecting the detection/measurement signal to overlap at least one transmission duration of the detection/measurement signal, based on the transmission configuration information and the discontinuous reception information.

公开(公告)号：US20170374646A1

公开(公告)日：2017-12-28

申请号：US15544909

申请日：2016-01-21

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Liu Liu ,  Huiling Jiang ,  Qin Mu

IPC: H04W68/02 ,  H04W72/04

CPC classification number: H04W68/02 ,  H04L5/0053 ,  H04L5/0092 ,  H04W4/70 ,  H04W68/005 ,  H04W72/042

Abstract: The present invention is designed so that communication can be carried out adequately even when the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth. A user terminal, in which the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth, has a receiving section that receives paging information that is transmitted in a predetermined subframe, and a control section that controls the receipt of a downlink shared channel and/or an enhanced downlink control channel by using information about a CFI (Control Format Indicator) value that is acquired based on the paging information, and the receiving section detects a common search space, which is allocated in a fixed starting location in the predetermined subframe, and receives the paging information indicated in the common search space.