公开(公告)号：US11451313B2

公开(公告)日：2022-09-20

申请号：US16495734

申请日：2018-03-21

Applicant: NTT DOCOMO, INC.

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

IPC: H04W24/00 ,  H04B7/02 ,  H04B17/309 ,  H04B7/0408 ,  H04W24/08

Abstract: Disclosed is a method for detecting radio link failure (RLF) and user equipment (UE). The UE is configured with multiples pairs of beams, each pair of beams comprising a transmitting beam used by a base station (BS) to transmit a signal and a corresponding receiving beam used by the UE to receive the signal. The method includes: in a lower layer, measuring the quality of a reference signal received through a receiving beam in each pair of beams and transmitted by a BS using a transmitting beam corresponding to the receiving beam, to serve as the channel quality for the multiple transmitting beams included in the multiple pairs of beams; determining whether the channel quality for the multiple transmitting beams meets a first condition; if so, transmitting to an upper layer an Out-Of-Sync (OOS) indication information, such that the upper layer determines if, according to the OOS indication information, RLF has occurred. As such, the present invention enables detection of RLF in a multi-beam scenario.

公开(公告)号：US11356207B2

公开(公告)日：2022-06-07

申请号：US16609594

申请日：2018-03-07

Applicant: NTT DOCOMO, INC.

Inventor： Jiahui Liu ,  Qin Mu ,  Liu Liu ,  Naoto Okubo

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

Abstract: Disclosed are a HARQ-ACK feedback method, a HARQ-ACK extraction method, a base station, and a user equipment. The Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback method is performed by a base station, and used to feed back corresponding HARQ-ACKs to a plurality of user equipments. The method includes: generating, by employing a plurality of HARQ-ACKs corresponding to the plurality of user equipments, at least one piece of downlink control information, where for each user equipment, an implicit mapping relationship exists between the user equipment and one or more information bits of the downlink control information; and transmitting to the plurality of user equipments the downlink control information.

公开(公告)号：US11350373B2

公开(公告)日：2022-05-31

申请号：US15127671

申请日：2015-03-18

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Yuichi Kakishima ,  Tooru Uchino ,  Liu Liu ,  Huiling Jiang ,  Li Zhao ,  Yong Li ,  Mugen Peng ,  Wenbo Wang

IPC: H04W52/36 ,  H04L5/00 ,  H04W52/34

Abstract: The present invention is designed to reduce the decrease of uplink throughput in the event a user terminal connects with a plurality of radio base stations. A user terminal (20) according to an example of the present invention provides a user terminal to connect with a plurality of radio base stations including at least a first radio base station and a second radio base station, and this user terminal has a PH report generating section (411) that calculates the PH (Power Headroom) of each radio base station and generates PH reports, and a transmission section (203) that transmits either the PUSCH (Physical Uplink Shared Channel) bandwidth of the first radio base station, a PH report per resource block, or information about the transmission power density, and a PH report for the first radio base station, to the second radio base station.

公开(公告)号：US11218202B2

公开(公告)日：2022-01-04

申请号：US16496295

申请日：2018-03-07

Applicant: NTT DOCOMO, INC.

Inventor： Min Liu ,  Liu Liu ,  Huiling Jiang ,  Xin Wang ,  Qin Mu ,  Chongning Na ,  Jing Wang ,  Yuichi Kakishima ,  Kazuaki Takeda ,  Satoshi Nagata

IPC: H04B7/06 ,  H04B7/0408 ,  H04W16/28

Abstract: Provided are a beam configuration method, a mobile station and a base station. The beam configuration method performed by a base station according to embodiments of the present invention includes: determining a beam transmission scheme for a mobile station according to performance of the mobile station; and transmitting information to the mobile station according to the beam transmission scheme.

公开(公告)号：US20210345298A1

公开(公告)日：2021-11-04

申请号：US17372922

申请日：2021-07-12

Applicant: NTT DOCOMO, INC.

Inventor： Shinpei Yasukawa ,  Satoshi Nagata ,  Qun Zhao ,  Jing Wang ,  Huan Wang ,  Liu Liu ,  Anxin Li ,  Huiling Jiang

IPC: H04W72/02 ,  H04W92/18 ,  H04W24/10 ,  H04W74/08 ,  H04W4/40

Abstract: A terminal is disclosed including a selection unit that selects first resource candidates for sidelink transmission based on monitoring in a sensing window, and specifies second resource candidates by excluding specific periodic resources that are reserved by another terminal from the first resource candidates; and a transmission unit that performs sidelink transmission using a resource selected from the second resource candidates. In another aspect, a transmission method executed by a terminal is also disclosed.

公开(公告)号：US20210289481A1

公开(公告)日：2021-09-16

申请号：US16336515

申请日：2017-09-29

Applicant: NTT DOCOMO, INC.

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

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

Abstract: The disclosure relates to that uplink control information are transmitted properly, when Uplink (UL)/Downlink (DL) configurations are changed, in a communication system configured to use listening. A receiving section that receives downlink control information and downlink data which are transmitted in a DL burst period, and a control section that controls transmission of a delivery acknowledgment signal in response to the downlink data, based on the result of UL listening, are provided, and, when a UL burst is configured in the DL burst period, the control section exerts control to transmit the delivery acknowledgment signal in response to the downlink data by using at least one of the UL burst, a UL transmission period, where UL transmission is commanded outside the DL burst period and a UL burst which is configured in another DL burst period following the DL burst period, based on a reception timing of the downlink data.

公开(公告)号：US11089623B2

公开(公告)日：2021-08-10

申请号：US16482902

申请日：2018-02-02

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Qin Mu ,  Liu Liu ,  Huiling Jiang

IPC: H04W72/12 ,  H04W72/04

Abstract: The present invention provides a user terminal and a radio communication method, whereby data communication processes can be performed adequately even when downlink control channels that are different from those of existing LTE systems are configured. A user terminal has a receiving section that receives downlink control information, which is transmitted via a downlink control channel in a control resource set configured in a predetermined resource block, and a control section that controls receipt of downlink data scheduled in a predetermined frequency field, based on the downlink control information, and the downlink data is allocated over the predetermined frequency field from the same time location, or allocated to the predetermined frequency field from varying time locations.

公开(公告)号：US20210235436A1

公开(公告)日：2021-07-29

申请号：US17229214

申请日：2021-04-13

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Shaozhen Guo ,  Lihui Wang ,  Liu Liu ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04W72/04 ,  H04W72/12 ,  H04W28/04

Abstract: A terminal is disclosed that includes a receiver that receives first downlink control information (DCI) for scheduling initial transmission and second DCI for scheduling retransmission and a processor that controls transmission of a first uplink (UL) shared channel that is scheduled by the first DCI and transmission of a second UL shared channel that is scheduled by the second DCI. The processor controls the transmission of the first UL shared channel and the transmission of the second UL shared channel based on a reference value that is configured for timing for transmitting a UL shared channel based on information provided through higher layer signaling. The processor also controls transmission of the second UL shared channel in response to information included in each of the first DCI and the second DCI that indicates whether the UL shared channel includes initially transmitted data.

公开(公告)号：US11076310B2

公开(公告)日：2021-07-27

申请号：US16475920

申请日：2018-01-05

Applicant: NTT DOCOMO, INC.

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

IPC: H04W24/10 ,  H04W16/28 ,  H04W88/02

Abstract: The present invention is designed to adequately perform communication in accordance with measurement operation even when beam forming is applied. A user terminal according to the present invention has a receiving section that receives a DL measurement transmitted from one or a plurality of antenna ports, a measurement section that performs cell level measurement and/or beam level measurement using the DL measurement signal, and a control section that controls reporting of the measurement result of cell level measurement and/or beam level measurement, wherein the control section controls random access using resources configured in accordance with a reporting target of the measurement result.

公开(公告)号：US11057931B2

公开(公告)日：2021-07-06

申请号：US16087831

申请日：2017-03-29

Applicant: NTT DOCOMO, INC.

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

IPC: H04W74/08 ,  H04W16/14 ,  H04W74/00 ,  H04W76/27 ,  H04W72/04 ,  H04W80/02

Abstract: The present invention is designed to perform random access procedures adequately in a carrier in which LBT (Listen Before Talk) is configured. A user terminal, according to one aspect of the present invention, has a control section that controls random access procedures for a carrier where listening is performed before uplink transmission, a receiving section that receives downlink control information including information about a period that is formed with a plurality of transmission time intervals (TTIs) in which a random access preamble can be transmitted, and a transmission section that transmits the random access preamble in the period, in the carrier, in response to receipt of the downlink control information.