公开(公告)号：US20210037589A1

公开(公告)日：2021-02-04

申请号：US16964361

申请日：2019-01-17

Applicant: NTT DOCOMO, INC.

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

IPC: H04W76/18 ,  H04W74/08 ,  H04B7/08 ,  H04W24/04

Abstract: A terminal is disclosed including a processor that increments a beam failure instance counter, in a higher layer, based on a beam failure instance indication received from a physical layer; and a transmitter that, when the beam failure instance counter is greater than or equal to a given threshold, transmits a random access preamble based on a transmission instruction from the higher layer. In another aspect, a radio communication method for a terminal is also disclosed.

公开(公告)号：US10892808B2

公开(公告)日：2021-01-12

申请号：US16476522

申请日：2018-01-05

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

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata ,  Kazuaki Takeda

IPC: H04L5/00 ,  H04B7/06

Abstract: A method of acquiring Channel State Information (CSI) in a wireless communication system includes transmitting, from a Base Station (BS) to a User Equipment (UE), a resource setting including time-domain behavior of CSI-Reference Signals (RSs) transmission that designates aperiodic, periodic, or semi-persistent; and transmitting, from the BS to the UE, the CSI-RSs based on the designated aperiodic, periodic, or semi-persistent. The resource setting includes precoding information that indicates whether precoders applied to the CSI-RSs is the same or different. The resource setting includes periodicity and a timing offset value of the CSI-RS transmission when the periodic or the semi-persistent is designated. The resource setting includes frequency-domain information that designates a wideband or a partial band used for the CSI-RS transmission. The resource setting includes a transmission bandwidth of the CSI-RS transmission when the partial band is designated.

公开(公告)号：US20200295979A1

公开(公告)日：2020-09-17

申请号：US16651133

申请日：2017-09-29

Applicant: NTT DOCOMO, INC.

Inventor： Keisuke Saito ,  Kazuaki Takeda ,  Satoshi Nagata ,  Yuichi Kakishima

IPC: H04L27/26 ,  H04W74/00

Abstract: A terminal is disclosed including a processor configured to map a phase tracking reference signal, PTRS, to at least one symbol used for an uplink shared channel starting from a leading symbol of the uplink shared channel; and a transmitter configured to perform transmission processing for the uplink shared channel and the PTRS. In other aspects, another terminal and a base station are also disclosed.

公开(公告)号：US20200267722A1

公开(公告)日：2020-08-20

申请号：US16649072

申请日：2017-09-25

Applicant: NTT DOCOMO, INC.

Inventor： Keisuke Saito ,  Kazuaki Takeda ,  Satoshi Nagata ,  Yuichi Kakishima

IPC: H04W72/04

Abstract: A base station apparatus performs communication with a user apparatus and includes a setting unit that arranges a reference signal used for phase correction in a radio frame at a predetermined interval and a transmitting unit that transmits the radio frame to the user apparatus, and, in a case in which the reference signal used for the phase correction is punctured in the radio frame, the reference signal used for the phase correction is arranged in a resource of the radio frame in which the reference signal used for the phase correction is arrangeable.

公开(公告)号：US10693616B2

公开(公告)日：2020-06-23

申请号：US15752054

申请日：2016-08-12

Applicant: NTT DOCOMO, INC. ,  DOCOMO Innovations, Inc.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Chongning Na ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04L5/00 ,  H04B7/06 ,  H04W24/10

Abstract: A method of Channel State Information Reference Signal (CSI-RS) transmission from a base station (BS) to a user equipment (UE) includes reserving, with the BS, a CSI-RS resource used for aperiodic CSI-RS transmission in subframes transmitted from the BS, transmitting, from the BS to the UE, reservation information indicating the CSI-RS resource via higher layer signaling, and transmitting, from the BS to the UE, the aperiodic CSI-RS using the CSI-RS resource.

公开(公告)号：US20200169365A1

公开(公告)日：2020-05-28

申请号：US16610725

申请日：2018-05-03

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata

IPC: H04L5/00 ,  H04B7/06 ,  H04L27/26

Abstract: A transmission and reception point (TRP) includes a processor that multiplexes multiple Channel State Information-Reference Signals (CSI-RSs) and at least one Cyclic Prefix (CP) within an Orthogonal Frequency-Division Multiplexing (OFDM) symbol. The TRP further includes a transmitter that transmits the multiple CSI-RSs and the at least one CP to a user equipment (UE). The at least one CP has a predetermined length.

公开(公告)号：US20200007287A1

公开(公告)日：2020-01-02

申请号：US16337799

申请日：2017-09-28

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

Inventor： Yuichi Kakishima ,  Chongning Na ,  Satoshi Nagata

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

Abstract: A wireless communication method includes transmitting, from a base station (BS) to a user equipment (UE), information indicating a resource designated as a Zero-Power (ZP) Reference Signal (RS) or an Interference Measurement Resource (IMR) dynamically, and receiving, with the UE, the ZP RS or the IMR from the BS using the information. The BS transmits the information using at least one of Downlink Control information (DCI) and a Media Access Control (MAC) Control Element (CE). Each of a plurality of Resource Blocks (RBs) includes the resource and part of the plurality of RBs include the resources that are frequency-multiplexed. The wireless communication method further includes notifying, with the BS, the UE of frequency-multiplexing information indicating the part of the plurality of RBs. The UE receives the ZP RS or the IMR using the frequency-multiplexing information.

公开(公告)号：US20200007213A1

公开(公告)日：2020-01-02

申请号：US16482934

申请日：2018-02-01

Applicant: NTT DOCOMO, INC.

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

IPC: H04B7/06 ,  H04L5/00 ,  H04W72/04

Abstract: A method of Channel State Information (CSI) reporting in a wireless communication system includes performing, with a user equipment (UE), advanced CSI reporting based on a high resolution CSI feedback scheme. The advanced CSI reporting includes a beam index that identifies each of beams and amplitude of the beam corresponding to the beam index. The performing performs the advanced CSI reporting using a Physical Uplink Control Channel (PUCCH) format 3/4/5. The beam index and the amplitude are located in the PUCCH format 3/4/5. The performing performs first advanced CSI reporting and performs second advanced CSI reporting after performing the first advanced CSI reporting. The first advanced CSI reporting includes one of the beam index and the amplitude. The second advanced CSI reporting includes the beam index or the amplitude that is not included in the first advanced CSI reporting.

公开(公告)号：US10389418B2

公开(公告)日：2019-08-20

申请号：US15821283

申请日：2017-11-22

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Yoshihisa Kishiyama ,  Chongning Na

IPC: H04B7/04 ,  H04B7/0456 ,  H04B7/10 ,  H04B7/06 ,  H04W16/28

Abstract: A user equipment used in a mobile communication system that has multiple antenna ports configured to receive a first reference signal from a base station is disclosed. The antenna ports are configured to transmit the first feedback information for the first reference signal. Additionally, the antenna ports are configured to receive a second reference signal from the base station and transmit the second feedback information for the second reference signal.

公开(公告)号：US10356644B2

公开(公告)日：2019-07-16

申请号：US15850808

申请日：2017-12-21

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Yoshihisa Kishiyama

IPC: H04B7/06 ,  H04L5/00 ,  H04W16/28 ,  H04B7/0417 ,  H04W72/12 ,  H04W24/10 ,  H04B7/0413

Abstract: A base station that communicates with a mobile station by using a plurality of antenna ports includes a mapping information communication unit configured to generate mapping of reference signals for measuring channel state information of the antenna ports. The base station applies identical mapping of the reference signals for measuring the channel state information to antenna ports included in any one group of the plurality of groups, while applying code division multiplexing to the reference signals for measuring the channel state information for the antenna ports. The base station applies different mappings of the reference signals for measuring the channel state information and communicates information indicating the generated mapping to the mobile station. The base station also includes a multiplexer to multiplex the reference signals in accordance with the generated mapping and a transmitter to transmit the reference signals for measuring the channel state information.