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公开(公告)号：US20190140878A1
公开(公告)日：2019-05-09
申请号：US16300392
申请日：2017-05-11
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Satoshi Nagata , Lihui Wang , Liu Liu , Huiling Jiang
Abstract: The present invention is designed to suitably support transmission of uplink control information even when shortened TTIs are used. According to one aspect of the present invention, a user terminal that communicates using a shortened transmission time interval (TTI), in which the TTI duration is shorter than one ms, has a control section that controls transmission of uplink control information, and a transmission section that transmits the uplink control information in a predetermined shortened TTI, using an uplink control channel format, which is for shortened TTIs and which is compatible with multiple TTI durations.
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公开(公告)号：US20190124678A1
公开(公告)日：2019-04-25
申请号：US16089152
申请日：2017-03-30
Applicant: NTT DOCOMO, INC.
Inventor： Hiroki Harada , Satoshi Nagata , Lihui Wang , Liu Liu , Huiling Jiang
Abstract: The present invention is designed to realize appropriate reporting of information about the allocation of UL signals. A user terminal has a receiving section that receives downlink control information including uplink resource allocation information, a control section that determines, based on the uplink resource allocation information, a resource block (RB) allocation pattern that is repeated every given-number of resource blocks, and a transmitting section that transmits a UL signal by using a plurality of resource blocks that are determined based on the RB allocation pattern.
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公开(公告)号：US20190116615A1
公开(公告)日：2019-04-18
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
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.
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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
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.
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公开(公告)号：US20190069197A1
公开(公告)日：2019-02-28
申请号：US16086723
申请日：2017-03-21
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Satoshi Nagata , Xiaolin Hou , Huiling Jiang , Xin Wang
Abstract: The present invention is designed to adequately achieve the effect of latency reduction even when TDD is applied. A user terminal communicates using a radio frame including a flexible subframe whose subframe type is changeable, and has a control section that controls transmission/reception based on a first subframe type, in which a UL control channel, a DL control channel, a UL data channel and/or a DL data channel are included in one subframe, and a second subframe type, in which UL communication or DL communication is performed in one subframe, and a receiving section that receives information about a subframe type provided in each flexible subframe.
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Patent Agency Ranking
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
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.
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公开(公告)号：US10211894B2
公开(公告)日：2019-02-19
申请号：US15744117
申请日：2016-07-12
Applicant: NTT DOCOMO, INC.
Inventor： Yang Lan , Anxin Li , Huiling Jiang
IPC: H04K1/10 , H04L27/28 , H04B7/0456 , H04B7/04 , H04B17/309 , H04W72/12
Abstract: Disclosed are a downlink precoding method and a base station. The method includes: configuring a first precoding mode for a first cell, wherein the first precoding mode includes information of a precoding matrix configured for each candidate user of the first cell on each resource; selecting a scheduling user on each resource from candidate users according to the first precoding mode; and performing precoding to a channel estimation signal and downlink data of the scheduling user according to a precoding matrix of the scheduling user, and transmitting precoded channel estimation signal and precoded downlink data to the scheduling user. Such method and base station of the present disclosure can reduce the feedback overhead of the user, effectively improve the accuracy of channel quality indicator (CQI) estimation, and improve the system throughput and user throughput.
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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.
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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
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.
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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
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.
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