公开(公告)号：US09930666B2

公开(公告)日：2018-03-27

申请号：US14996255

申请日：2016-01-15

Applicant: NTT DoCoMo, Inc.

Inventor： Xin Wang ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04W72/04 ,  H04B7/0452 ,  H04W72/12 ,  H04L5/00 ,  H04L1/18

CPC classification number: H04W72/0453 ,  H04B7/0452 ,  H04L1/1812 ,  H04L5/0051 ,  H04L5/0091 ,  H04W72/0406 ,  H04W72/1289

Abstract: The present disclosure provides a method and base station for Multiple User-Multiple Input Multiple Output (MU-MIMO) transmission in a wireless communication system. The base station re-allocates frequency resources of a DMRS port which are allocated to N first data flows to M second data flows, wherein M is greater than N, and N first data flows may be used by N first UEs or less than N first UEs. The base station designates a DMRS port for K second UEs involved in joint scheduling according to the re-allocation result of frequency resources of a DMRS port, and sends information of the designated DMRS port via a downlink control signaling to the K second UEs, where K is lower than M or equal to M.

公开(公告)号：US20250007573A1

公开(公告)日：2025-01-02

申请号：US18706292

申请日：2021-11-24

Applicant: NTT DOCOMO, INC.

Inventor： Xiang Li ,  Xiaolin Hou ,  Xin Wang ,  Lan Chen ,  Satoshi Suyama ,  Tatsuki Okuyama

IPC: H04B7/0456 ,  H04B7/0404

Abstract: Embodiments of the present disclosure provide a receiving device and a transmitting device. The receiving device according to the embodiments of the present disclosure includes: a transceiving unit, configured to receive multiple un-precoded data streams sent through a plurality of antenna ports in a transmitting device; and a control unit, configured to determine an equivalent digital baseband channel matrix for a respective one of the plurality of antenna ports based on information on the intensity of a line of sight (LOS) channel component, and demodulate the multiple data streams according to the equivalent digital baseband channel matrix. The transmitting device according to the embodiments of the present disclosure includes: a control unit, configured to determine multiple un-precoded data streams for a receiving device; and a transceiving unit, including a plurality of antenna ports, respective ones of the plurality of antenna ports being configured to send the multiple data streams.

公开(公告)号：US12177707B2

公开(公告)日：2024-12-24

申请号：US17625939

申请日：2019-07-19

Applicant: NTT DOCOMO, INC.

Inventor： Yuki Matsumura ,  Satoshi Nagata ,  Wenjia Liu ,  Jing Wang ,  Xiaolin Hou ,  Xin Wang

IPC: H04W24/10 ,  H04W72/54

Abstract: A terminal according to the present disclosure includes: a receiving section that receives configuration information related to channel state information (CSI) reporting; and a control section that controls transmission of a plurality of pieces of wideband information each including at least one of information related to a plurality of delays and information related to a plurality of coefficients corresponding to the delays, based on the configuration information. Thereby, it is possible to prevent degradation of the reporting accuracy of CSI while suppressing the increment of the UL overhead.

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：US11889534B2

公开(公告)日：2024-01-30

申请号：US17054045

申请日：2018-05-10

Applicant: NTT DOCOMO, INC.

Inventor： Yuki Matsumura ,  Satoshi Nagata ,  Jing Wang ,  Min Liu ,  Huiling Li ,  Xin Wang ,  Xiaolin Hou

IPC: H04W72/53 ,  H04L1/00 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/044 ,  H04W80/02 ,  H04W72/23

CPC classification number: H04W72/53 ,  H04L1/0068 ,  H04W72/046 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/23 ,  H04W80/02

Abstract: To prevent deterioration of communication quality even when communication is performed by using a plurality of transmission points, one aspect of a user terminal according to the present disclosure includes: a receiving section that receives a physical shared channel transmitted from a plurality of transmission points, based on certain downlink control information; and a control section that determines at least one of rate matching, quasi-co-location, and a resource to be assigned for the physical shared channel transmitted from the plurality of transmission points, based on the downlink control information.

公开(公告)号：US11811508B2

公开(公告)日：2023-11-07

申请号：US17266800

申请日：2018-08-09

Applicant: NTT DOCOMO, INC.

Inventor： Wenjia Liu ,  Runxin Wang ,  Xiaolin Hou ,  Xin Wang

IPC: H04L5/00 ,  H04W72/044 ,  H04W72/23 ,  H04W72/0453 ,  H04W72/0446 ,  H04W72/121

CPC classification number: H04L5/0048 ,  H04L5/001 ,  H04L5/0092 ,  H04L5/0094 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/0473 ,  H04W72/23 ,  H04W72/121

Abstract: A method and device for transmitting reference signals are provided in the present disclosure, where the method for transmitting reference signals is performed by a user terminal and time-frequency resources for the user terminal are divided into multiple groups of time-frequency resources. The method includes: selecting a reference signal port for each group of time-frequency resources from candidate reference signal ports; and transmitting reference signals by using the reference signal port corresponding to each group of time-frequency resources.

公开(公告)号：US20230291621A1

公开(公告)日：2023-09-14

申请号：US18319232

申请日：2023-05-17

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Shaozhen Guo ,  Jing Wang ,  Xin Wang ,  Xiaolin Hou

IPC: H04L25/03 ,  H04L27/26

CPC classification number: H04L25/03834 ,  H04L27/26025 ,  H04L25/03159 ,  H04L25/03343

Abstract: A terminal includes a transmitting and receiving unit and a control unit. The transmitting and receiving unit transmits and receives a slot including a plurality of symbols. The control unit determines number of symbols included in a sub-frame on the basis of a time length of the symbol. The control unit determines the number of symbols included in the sub-frame according to a degree of modulation at which the time length of the symbol varies.

公开(公告)号：US20230246695A1

公开(公告)日：2023-08-03

申请号：US18011447

申请日：2021-04-09

Applicant: NTT DOCOMO, INC.

Inventor： Xin Wang ,  Xiaolin Hou ,  Anxin Li ,  Lan Chen

IPC: H04B7/06 ,  H04B7/0417

CPC classification number: H04B7/0658 ,  H04B7/0417

Abstract: The present invention provides a terminal and a base station in a wireless communication system, and methods executed by the terminal and the base station. The terminal comprises: a processing unit, configured to perform characteristic domain transformation on a channel matrix to obtain a transformed channel characteristic and compress the transformed channel characteristic to obtain a compressed channel characteristic; and a transmitting unit, configured to transmit the compressed channel characteristic, as feedback information, to the base station.

公开(公告)号：US20220286330A1

公开(公告)日：2022-09-08

申请号：US17597663

申请日：2019-07-18

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Negata ,  Shaozhen Guo ,  Jing Wang ,  Xin Wang ,  Xiaolin Hou

IPC: H04L25/03 ,  H04L27/26

Abstract: A terminal receives a slot that includes a plurality of symbols. The terminal determines the number of symbols included in a sub-frame on the basis of a time length of the symbol.

公开(公告)号：US11303408B2

公开(公告)日：2022-04-12

申请号：US16637982

申请日：2018-08-09

Applicant: NTT DOCOMO, INC.

Inventor： Min Liu ,  Chongning Na ,  Xin Wang ,  Jing Wang ,  Yuichi Kakishima ,  Satoshi Nagata

IPC: H04W16/28 ,  H04L5/00 ,  H04B7/06

Abstract: A reference signal transmission and reception method is presented. The transmission method includes: transmitting a plurality of first reference signals; and transmitting a plurality of groups of second reference signals, where each first reference signal corresponds to one of the plurality of groups of second reference signal, and the group of second reference signals includes a plurality of second reference signals, where a part of reference signals in the group of second reference signals include quasi co-located information, and the quasi co-located information indicates a correlation between resources for the group of second reference signals including the quasi co-located information and resources for the first reference signal corresponding to the group of second reference signals.