公开(公告)号：US12199723B2

公开(公告)日：2025-01-14

申请号：US17634808

申请日：2020-08-12

Applicant: NTT DOCOMO, INC.

Inventor： Nadisanka Rupasinghe ,  Shohei Yoshioka ,  Yuki Matsumura ,  Satoshi Nagata

IPC: H04B7/06 ,  H04L5/00

Abstract: A user equipment (UE) in communication with a base station (BS) is disclosed that includes a receiver that receives Channel State Information (CSI)-Reference Signals (RSs) from the BS, a processor that generates CSI based on the CSI-RS and performs CSI omission, and a transmitter that transmits, to the BS, CSI reports including the CSI where one or more linear combination (LC) coefficients are omitted based on the CSI omission. Further, in the CSI omission, the processor prioritizes LC coefficients based on a predetermined priority rule and the processor also determines the omitted one or more LC coefficients based on the prioritized LC coefficients. In other aspects, a method for a UE and a wireless communication system are disclosed.

公开(公告)号：US20240022289A1

公开(公告)日：2024-01-18

申请号：US18255478

申请日：2021-12-16

Applicant: NTT DOCOMO, INC.

Inventor： Nadisanka Rupasinghe ,  Yuki Matsumura

IPC: H04B7/0417 ,  H04B7/0456

CPC classification number: H04B7/0417 ,  H04B7/0478 ,  H04B7/0626

Abstract: A terminal for performing Channel State Information (CSI) reporting for type II port selection codebook includes a receiver that receives beamformed CSI reference signal (RS) ports comprising spatial domain (SD) beams and frequency domain (FD) base. In addition, the terminal includes a processor that, using higher layer signaling, configures a number of SD beam selection and a number of FD base selection, and selects a first value from a first set of values for the number of SD beam selection and a second value from a second set of values for the number of FD base section. The terminal further includes a transmitter that transmits the first value and the second values.

公开(公告)号：US20230261832A1

公开(公告)日：2023-08-17

申请号：US18014430

申请日：2021-09-15

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

Inventor： Nadisanka Rupasinghe ,  Haralabos Papadopoulos ,  Yuki Matsumura

IPC: H04L5/00 ,  H04B7/06 ,  H04B7/08

CPC classification number: H04L5/0051 ,  H04B7/0626 ,  H04B7/088 ,  H04B7/0695

Abstract: A terminal is disclosed that includes a receiver that receives beamforming information relating to one or more beamformed Channel State Information—Reference Signals (CSI-RSs), the CSI-RSs corresponding to one or more Spatial Domains (SDs) or Frequency Domains (FDs). The terminal also includes a processor that determines a type of the one or more CSI-RSs, and when the type of the one or more CSI-RS is a Type II, performs a Type II port selection codebook with a beamformed CSI-RS of the one or more CSI-RSs in the SD and FD domains.

公开(公告)号：US20230007927A1

公开(公告)日：2023-01-12

申请号：US17756889

申请日：2020-12-04

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

Inventor： Haralabos Papadopoulos ,  Nadisanka Rupasinghe ,  Yuki Matsumura

IPC: H04W16/28 ,  H04B7/01 ,  H04W24/10 ,  H04B7/06

Abstract: A terminal is disclosed including a processor that measures for beam management: a Doppler spread or a coherence time associated with a beam and one or more reporting quantities. The terminal also includes a transceiver that reports the Doppler spread or the coherence time. In other aspects, a method for a terminal and a base station are also disclosed.

公开(公告)号：US20240187070A1

公开(公告)日：2024-06-06

申请号：US18552342

申请日：2022-03-24

Applicant: NTT DOCOMO, INC.

Inventor： Nadisanka Rupasinghe ,  Yuki Matsumura

IPC: H04B7/06 ,  H04L27/26 ,  H04W72/232

CPC classification number: H04B7/0626 ,  H04B7/0639 ,  H04B7/0663 ,  H04L27/265 ,  H04W72/232

Abstract: A wireless communication method for a terminal is disclosed that includes receiving, via Downlink Control Information (DCI) or higher layer signaling, configuration information; and configuring whether to report additional Discrete Fourier Transform (DFT) bases based on the configuration information. In other aspects, a terminal and a system are also disclosed.

公开(公告)号：US20240039604A1

公开(公告)日：2024-02-01

申请号：US18258374

申请日：2020-12-29

Applicant: NTT DOCOMO, INC.

Inventor： Wenjia Liu ,  Xiaolin Hou ,  Xin Wang ,  Yuki Matsumura ,  Nadisanka Rupasinghe

IPC: H04B7/06

CPC classification number: H04B7/0639

Abstract: The present disclosure provides a method for precoding matrix indicator (PMI) transmission and a method for determining precoding granularity performed by a terminal, and a corresponding terminal and base station. The terminal includes: a receiving unit configured to receive first information about the precoding matrix indicator (PMI) from a base station of the communication system; and a control unit configured to determine whether to transmit second information about the precoding matrix indicator according to the first information, wherein the precoding matrix indicator is for a subcarrier-level precoding matrix.

公开(公告)号：US11888564B2

公开(公告)日：2024-01-30

申请号：US17292021

申请日：2019-11-21

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

Inventor： Nadisanka Rupasinghe ,  Yuki Matsumura ,  Satoshi Nagata

IPC: H04B7/06 ,  H04L27/26

CPC classification number: H04B7/0626 ,  H04B7/0634 ,  H04B7/0641 ,  H04B7/0663 ,  H04L27/2636

Abstract: A wireless communication method for a terminal, a terminal, and a wireless communication system receive one or more Channel State Information Reference Signals (CSI-RSs). Further, quantization of combination coefficients of the one or more CSI-RSs corresponding to one or more spatial beams Discrete Fourier Transform (DFT) basis vector amplitudes is performed.

公开(公告)号：US20230033260A1

公开(公告)日：2023-02-02

申请号：US17758564

申请日：2021-04-16

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

Inventor： Nadisanka Rupasinghe ,  Yuki Matsumura ,  Satoshi Nagata

IPC: H04L5/00 ,  H04B7/0413 ,  H04W72/04

Abstract: A terminal incudes a processor, a transmitter, and Rx antenna ports. The number of the Rx antenna ports is less than or equal to 8. The transmitter transmits a sounding reference signal (SRS) using the Rx antenna ports. The processor that switches the antenna ports for the SRS transmission. The number of Rx antenna ports is 8. A method of communicating with a terminal including 8 Rx antenna ports includes transmitting, to a base station, an SRS; and switching among the 8 Rx antenna ports for the SRS transmission.

公开(公告)号：US20220149906A1

公开(公告)日：2022-05-12

申请号：US17599978

申请日：2020-03-27

Applicant: NTT DOCOMO, INC.

Inventor： Nadisanka Rupasinghe ,  Haralabos Papadopoulos

IPC: H04B7/0456 ,  H04B7/0404 ,  H04B7/06

Abstract: A method of applying rank two transmission from a plurality of sets of coherent antennas of a user equipment (UE) in a wireless communication system includes: transmitting two information streams using a first set from the plurality of sets of coherent antennas of the UE; and transmitting the two information streams using a second set from the plurality of sets of the coherent antennas of the UE. The first set and the second set are incoherent with respect to each other. The two information streams are common to the first set and the second set.

公开(公告)号：US12273160B2

公开(公告)日：2025-04-08

申请号：US18255478

申请日：2021-12-16

Applicant: NTT DOCOMO, INC.

Inventor： Nadisanka Rupasinghe ,  Yuki Matsumura

IPC: H04B7/0417 ,  H04B7/0456 ,  H04B7/06

Abstract: A terminal for performing Channel State Information (CSI) reporting for type II port selection codebook includes a receiver that receives beamformed CSI reference signal (RS) ports comprising spatial domain (SD) beams and frequency domain (FD) base. In addition, the terminal includes a processor that, using higher layer signaling, configures a number of SD beam selection and a number of FD base selection, and selects a first value from a first set of values for the number of SD beam selection and a second value from a second set of values for the number of FD base section. The terminal further includes a transmitter that transmits the first value and the second values.