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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
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.
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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.
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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
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.
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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
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.
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公开(公告)号：US20170347339A1
公开(公告)日：2017-11-30
申请号：US15513505
申请日：2015-09-18
Applicant: NTT DOCOMO, INC.
Inventor： Shimpei Yasukawa , Hiroki Harada , Satoshi Nagata , Qun Zhao
Abstract: A user apparatus for use in a mobile communication system that supports D2D communication, including: a signal transmission unit configured to transmit a plurality of D2D signals; and a resource selection unit configured to select, from a predetermined resource pool, a radio resource having a time resource and a frequency resource for transmitting the plurality of D2D signals, wherein the resource selection unit is configured to select the radio resource such that the plurality of D2D signals are not transmitted by a same time resource.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20170325243A1
公开(公告)日：2017-11-09
申请号：US15525490
申请日：2015-10-27
Applicant: NTT DOCOMO, INC.
Inventor： Shimpei Yasukawa , Hiroki Harada , Satoshi Nagata
CPC classification number: H04W72/085 , H04L5/0048 , H04W24/10 , H04W48/08 , H04W72/02 , H04W76/14 , H04W88/04 , H04W88/08 , H04W92/18
Abstract: A user equipment apparatus for supporting D2D (user equipment-to-user equipment) communication includes a generation unit configured to generate information about at least one of a transmission resource which can be used by the user equipment apparatus to transmit a D2D signal and a reception resource which can be used by the user equipment apparatus to receive a D2D signal; and a transmission unit configured to transmit the generated information to another user equipment apparatus; wherein the transmission resource and the reception resource are orthogonal in terms of time.
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公开(公告)号：US20170230976A1
公开(公告)日：2017-08-10
申请号：US15500611
申请日：2015-07-01
Applicant: NTT DOCOMO, INC.
Inventor： Hiroki Harada , Kazuki Takeda , Satoshi Nagata
CPC classification number: H04W72/0446 , H04W28/06 , H04W72/04 , H04W72/0413 , H04W72/042 , H04W72/1273 , H04W72/14
Abstract: The present invention is designed to control UL communication and DL communication flexibly and improve throughput in radio communication. The present invention provides a receiving section that receives uplink data that is transmitted from a user terminal by using an uplink shared channel (PUSCH), a transmission section that transmits downlink control information and downlink data to the user terminal, and a control section that controls scheduling for the user terminal, and the control section controls the transmission of the downlink data using the uplink shared channel (PUSCH).
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公开(公告)号：US20170215205A1
公开(公告)日：2017-07-27
申请号：US15328177
申请日：2015-07-03
Applicant: NTT DOCOMO, INC.
Inventor： Kazuaki Takeda , Hiroki Harada , Kazuki Takeda , Satoshi Nagata
CPC classification number: H04W74/0816 , H04B15/00 , H04L5/0048 , H04M11/00 , H04W16/14 , H04W24/08 , H04W48/08 , H04W48/16 , H04W74/08 , H04W88/06
Abstract: The present invention is designed so that the decrease of throughput can be reduced even when LBT is used in a radio communication system which runs LTE/LTE-A and/or the like in an unlicensed band. A radio base station communicates with a user terminal that can use a licensed band and unlicensed band, and has a detection section that detects signals transmitted from other transmission points, an acquiring section that acquires the identification numbers of transmission points corresponding to signals that are detected, and a transmission section that transmits data signals and demodulation reference signals in the unlicensed band, and sequences of the demodulation reference signals are linked with the identification numbers of the transmission points, and the transmission section transmits information about the identification numbers of the other transmission points to the user terminal.
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公开(公告)号：US09693291B2
公开(公告)日：2017-06-27
申请号：US14908916
申请日：2014-07-08
Applicant: NTT DOCOMO, INC.
Inventor： Hiroki Harada , Liu Liu , Lan Chen
CPC classification number: H04W48/16 , H04W16/32 , H04W36/0072 , H04W48/12 , H04W84/045
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 macro base station notifies a user terminal of measurement gap pattern information to represent a repetition period that is the same as the transmission cycle of a detection/measurement signal in small cells and a length of time that is the same as the transmission duration of the detection/measurement signal, and the start offset of the transmission duration, and the user terminal configures measurement gaps of the repetition period and the length of time, by using a start offset that is the same as the start offset.
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