公开(公告)号：US10536954B2

公开(公告)日：2020-01-14

申请号：US15574872

申请日：2016-06-30

Applicant: NTT DOCOMO, INC.

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

IPC: H04W72/12 ,  H04W24/10 ,  H04W16/14

Abstract: A user apparatus is provided. The user apparatus performs communications with a base station in a mobile communication system in which at least two carriers with different TTIs are used. The user apparatus includes a gap control unit configured to set a gap that is a period in which the user apparatus does not perform communications with the base station. The gap control unit sets a gap common to a gap set for one of the two carriers as a gap for the other of the two carriers.

公开(公告)号：US20200008232A1

公开(公告)日：2020-01-02

申请号：US16482987

申请日：2018-02-02

Applicant: NTT DOCOMO, INC.

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

IPC: H04W72/12 ,  H04W72/04 ,  H04W80/08

Abstract: The present invention is designed to transmit and/or receive data adequately even when data scheduling methods that are different from those of existing LTE systems are applied. a receiving section that receives downlink control information, and a control section that controls receipt and/or transmission of data scheduled by the downlink control information, where data that is transmitted in the same slot as and/or a different slot from that of the downlink control information is scheduled by the downlink control information, and the control section identifies the position in the time direction where the data is allocated, based on the downlink control information and/or common control information that is common to predetermined user terminals.

公开(公告)号：US20190357244A1

公开(公告)日：2019-11-21

申请号：US16531743

申请日：2019-08-05

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Tooru Uchino

IPC: H04W72/12 ,  H04W72/04 ,  H04L5/00 ,  H04L1/18 ,  H04W80/08

Abstract: A user terminal is disclosed that includes a receiver that receives first downlink control information (DCI) and second DCI for scheduling Physical Uplink Shared Channel (PUSCH) or Physical Downlink Shared Channel (PDSCH). The user terminal also includes a processor that, ifPUSCH or PDSCH in a first Transmission Time Interval (TTI) indicated by the first DCI collides with PUSCH or PDSCH in a second TTI that is indicated by the second DCI and is shorter than the first TTI, performs PUSCH transmission or PDSCH reception in the second TTI. In addition, the processor stops PUSCH transmission or PDSCH reception in the first TTI.

公开(公告)号：US10462781B2

公开(公告)日：2019-10-29

申请号：US15024896

申请日：2014-09-22

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Satoshi Nagata ,  Hiroyuki Ishii

IPC: H04W72/04 ,  H04L1/18 ,  H04L5/00 ,  H04L5/14

Abstract: The present invention is designed to carry out uplink transmission adequately even when CA is executed by applying different duplex modes between multiple cells. A user terminal communicates with an FDD cell and a TDD cell that employ carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, and a feedback control section that allocates and feeds back delivery acknowledgement signals in response to the DL signals in a predetermined UL subframe, and, regardless of which cell is configured as a primary cell, the feedback control section, when transmitting only a delivery acknowledgement signal in response to the DL signal of one cell, transmits the delivery acknowledgement signal from the one cell by using a PUCCH resource that is determined from a downlink control channel resource of the DL signal, and, when transmitting delivery acknowledgement signals in response to the DL signals of both cells, transmits the delivery acknowledgement signals by using a PUCCH resource of one or both of the cells.

公开(公告)号：US20190327762A1

公开(公告)日：2019-10-24

申请号：US16473954

申请日：2017-12-26

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Kazuki Takeda ,  Keisuke Saito ,  Satoshi Nagata

IPC: H04W74/00 ,  H04W74/08 ,  H04W72/04 ,  H04L5/00

Abstract: The present invention is designed to provide reference signal configurations that are suitable for user terminals. A user terminal has a transmission section that transmits a random access preamble (PRACH), a control section that controls the transmission of the PRACH by applying a specific PRACH configuration, and a receiving section that receives a DL reference signal, and the control section selects the specific PRACH configuration from a plurality of PRACH configurations, which are associated respectively with a plurality of reference signal configurations that are applied to the transmission of the DL reference signal.

公开(公告)号：US20190320344A1

公开(公告)日：2019-10-17

申请号：US16341218

申请日：2017-08-02

Applicant: NTT DOCOMO, INC.

Inventor： Yuki Matsumura ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W28/04 ,  H04W72/04 ,  H04L5/00

Abstract: A user terminal (20) is provided with: an error detection unit (205) that detects the presence/absence of an error concerning a downlink data signal and generates ACK or NACK which are error detection results; and a mapping unit (207) that maps a transmission signal on a first frequency resource in one symbol and corresponding to ACK when the error detection result is ACK, and maps a transmission signal on a second frequency resource different from the first frequency resource in the same symbol corresponding to NACK when the error detection result is NACK.

公开(公告)号：US10432365B2

公开(公告)日：2019-10-01

申请号：US15549395

申请日：2016-02-19

Applicant: NTT DOCOMO, INC.

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

IPC: H04L5/00 ,  H04W72/04 ,  H04J11/00 ,  H04W24/10 ,  H04W72/08 ,  H04W16/14 ,  H04L5/14 ,  H04W74/08

Abstract: The present invention is designed reduce the increase of load in user terminals 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 measurement section that makes measurements by using the DL signals, and a control section that controls the receiving operations in the receiving section and the measurement operations in the measurement 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, receiving operations and/or measurement operations that are different from those of the second CC.

公开(公告)号：US20190289641A1

公开(公告)日：2019-09-19

申请号：US16427788

申请日：2019-05-31

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Kazuki Takeda ,  Hideaki Takahashi

IPC: H04W74/08 ,  H04W52/14 ,  H04W52/50 ,  H04W52/38 ,  H04W72/12 ,  H04L5/00 ,  H04W52/40

Abstract: A mobile station is disclosed including a processor that, in Carrier Aggregation using component carriers that are under the control of a master radio base station and a secondary radio base station, when a plurality of random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plurality of random access procedures, performs a ramping control on a transmission power of a random access preamble in a random access procedure that is assigned priority and does not perform the ramping control on a transmission power of a random access preamble in the random access procedure other than the random access procedure that is assigned priority, a receiver that receives signals from the master radio base station and the secondary radio base station, and a transmitter that transmits signals to the master radio base station and the secondary radio base station.

公开(公告)号：US20190268946A1

公开(公告)日：2019-08-29

申请号：US16347750

申请日：2017-11-08

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuki Takeda ,  Satoshi Nagata

IPC: H04W74/08 ,  H04W28/04 ,  H04W72/14 ,  H04W72/12

Abstract: A random access procedure is suitably carried out in future radio communication systems. A user terminal that uses a random access procedure includes: a reception section that receives a contention resolution message during a random access; and a control section that controls transmission of a transmission acknowledgement signal for the contention resolution message, and the control section performs control to transmit the transmission acknowledgement signal by using resources of a predetermined uplink control channel based on at least a response signal for the random access or configuration information of an uplink control channel included in the contention resolution message.

公开(公告)号：US20190261397A1

公开(公告)日：2019-08-22

申请号：US16346270

申请日：2017-10-31

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Yuki Matsumura ,  Kazuaki Takeda ,  Satoshi Nagata ,  Lihui Wang

IPC: H04W72/12 ,  H04W28/06 ,  H04W72/04 ,  H04L27/26

Abstract: To properly transmit uplink control information (UCI) in future radio communication systems, a user terminal of the present invention is provided with a transmitting section that transmits uplink control information (UCI) in at least one of a plurality of slots with different time lengths of UL duration, and a control section that controls transmission of the UCI, where based on an explicit instruction from a radio base station or an implicit determination by the user terminal, the control section controls an uplink (UL) control channel used in transmission of the UCI.