公开(公告)号：US20210297137A1

公开(公告)日：2021-09-23

申请号：US16317994

申请日：2017-08-10

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Huiling Li ,  Chongning Na ,  Huiling Jiang ,  Yuichi Kakishima

IPC: H04B7/06 ,  H04B7/0456 ,  H04W16/28 ,  H04W24/10 ,  H04W72/04 ,  H04W72/08

Abstract: The present invention provides a user terminal that reports channel state information to base station apparatus in order to reduce the overhead of signaling required in beam measurements and to lower the complexity of beam measurements and calculation, and, in this user terminal, a receiving section that receives basis beam reference signals, each included in one or a plurality of basis beams transmitted from the base station, a determining section that determines a leading beam and a secondary beam to combine with the leading beam, based on the basis beam reference signals received, and a transmission section that transmits combination information about combination of the leading beam and the secondary beam to the base station apparatus, are provided.

公开(公告)号：US20210288761A1

公开(公告)日：2021-09-16

申请号：US16610837

申请日：2018-05-03

Applicant: NTT DOCOMO, INC. ,  DOCOMO INNOVATIONS, INC

Inventor： Yuichi Kakishima ,  Kazuki Takeda ,  Yosuke Sano ,  Lihui Wang ,  Satoshi Nagata

IPC: H04L1/18 ,  H04W72/04

Abstract: A method of codeword (CW) mapping in a wireless communication system includes determining, with a Transmission and Reception Point (TRP), order of resources mapped to the CW, and mapping, with the TRP, the CW to resources in accordance with the determined order. The order of resources is determined based on a frequency resource, a time resource, and a layer. The determining determines the order based on a type of re¬ transmission control. The type of re-transmission control is CW-level Hybrid Automatic Repeat Request (HARQ) and code block group (CBG)-level HARQ. When the CW-level HARQ is applied, the determining determines the order as order of the layer, the frequency resource, and the time resource. When the CBG-level HARQ is applied, the determining determines the order as order of the frequency resource, the layer, and the time resource.

公开(公告)号：US11122544B2

公开(公告)日：2021-09-14

申请号：US16609426

申请日：2017-05-01

Applicant: NTT DOCOMO, INC.

Inventor： Ryosuke Osawa ,  Hiroki Harada ,  Yuichi Kakishima

IPC: H04W72/08 ,  H04W72/02 ,  H04W72/04 ,  H04W74/08

Abstract: A terminal is disclosed including a processor and a transmitter. The processor determines, based on a threshold of a criterion, a beam having the criterion that is equal to or greater than the threshold. Further, the transmitter transmits a random access preamble based on the determined beam. In other aspects, a radio communication method for a terminal is also disclosed.

公开(公告)号：US20210273762A1

公开(公告)日：2021-09-02

申请号：US17326402

申请日：2021-05-21

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata

IPC: H04L5/00 ,  H04W76/27 ,  H04J1/02 ,  H04J13/16 ,  H04W72/04

Abstract: A wireless communication method includes transmitting, from a base station (BS) to a user equipment (UE), a configuration information indicating a resource used in transmission of a Channel State Information-Reference Signal (CSI-RS) by higher layer signaling; and receiving, with the UE, the CSI-RS from the BS based on the configuration information. The configuration information indicates a mapping for CSI-RS transmission using a single antenna port (AP) to a single resource element per a resource block. In other aspects, a UE, a BS, and a system are also disclosed.

公开(公告)号：US20210258923A1

公开(公告)日：2021-08-19

申请号：US17262039

申请日：2018-09-27

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Ryosuke Osawa

IPC: H04W72/02 ,  H04W72/04 ,  H04W4/40 ,  H04W56/00

Abstract: A user device includes a control unit that arranges a reference signal or a gap in a signal of D2D direct communication and a transmitting unit that transmits the signal of the D2D direct communication and information related to the reference signal or the gap to another user device.

公开(公告)号：US11082931B2

公开(公告)日：2021-08-03

申请号：US16609121

申请日：2017-05-01

Applicant: NTT DOCOMO, INC.

Inventor： Ryosuke Osawa ,  Hiroki Harada ,  Yuichi Kakishima

IPC: H04W52/36

Abstract: According to one aspect of the present invention, a user terminal has a transmission section that is capable of transmitting a plurality of waveforms including a first waveform and a second waveform while switching therebetween, wherein the first waveform is based on a first transmission scheme and the second waveform is based on a second transmission scheme, and transmits the first waveform at a given timing, by using a given cell, and a control section that calculates a power headroom for the second waveform, which is one of the plurality of waveforms and which is not transmitted at the given timing. According to one aspect of the present invention, communication can be continued adequately even when communication is performed by using multiple waveforms.

公开(公告)号：US11012127B2

公开(公告)日：2021-05-18

申请号：US16612644

申请日：2017-05-12

Applicant: NTT DOCOMO, INC.

Inventor： Ryosuke Osawa ,  Hiroki Harada ,  Yuichi Kakishima

IPC: H04B7/02 ,  H04B7/0456 ,  H04B7/06 ,  H04B7/08

Abstract: The apparatus according to one aspect of the present invention communicates using beams, and has a receiving section that receives information about a beam of another apparatus, and a control section that decides whether or not to select a transmitting beam autonomously, based on whether certain information is present or not. According to one aspect of the present invention, even when certain apparatus is capable of selecting beams autonomously, it is still possible to reduce the decline in communication throughput and so forth.

公开(公告)号：US10998952B2

公开(公告)日：2021-05-04

申请号：US16252883

申请日：2019-01-21

Applicant: NTT DOCOMO, INC.

Inventor： Yoshihisa Kishiyama ,  Yuichi Kakishima

IPC: H04B7/06 ,  H04L5/00 ,  H04W72/04 ,  H04W16/32 ,  H04B7/0413 ,  H04W16/28 ,  H04L27/26 ,  H04W84/04

Abstract: A user apparatus is disclosed herein that includes a receiver configured to receive a plurality of synchronization signals and a transmitter configured to transmit a sounding reference signal associated with a specific synchronization signal of the plurality of synchronization signals. The transmitter also maps the sounding reference signal to consecutive OFDM symbols in one slot.

公开(公告)号：US20210119680A1

公开(公告)日：2021-04-22

申请号：US17251734

申请日：2018-06-15

Applicant: NTT DOCOMO, INC.

Inventor： Yuki Matsumura ,  Yuichi Kakishima ,  Satoshi Nagata

IPC: H04B7/06 ,  H04W16/28 ,  H04B17/336 ,  H04L5/00 ,  H04W24/10 ,  H04W80/02

Abstract: A user equipment according to an aspect of the present disclosure includes: a receiving section configured to perform measurement on the basis of configuration information regarding measurement for channel state information (CSI); and a transmitting section configured to transmit the CSI including information regarding interference based on the measurement. According to an embodiment of the present disclosure, it is possible to perform appropriate measurement/report of CSI for beam selection.

公开(公告)号：US20210044396A1

公开(公告)日：2021-02-11

申请号：US16975975

申请日：2019-02-27

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Ryosuke Osawa ,  Satoshi Nagata

IPC: H04L5/00 ,  H04W72/04

Abstract: A terminal is disclosed including a processor that identifies a resource for a Channel State Information-Reference Signal (CSI-RS); and a transmitter that transmits a Sounding Reference Signal (SRS) by using a precoder based on the resource that was last transmitted. In other aspects, a radio communication method and a base station are also disclosed.