公开(公告)号：US20200163062A1

公开(公告)日：2020-05-21

申请号：US16634324

申请日：2017-07-28

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Qin Mu ,  Liu Liu

IPC: H04W72/04 ,  H04L5/00 ,  H04W8/24 ,  H04W48/12

Abstract: To appropriately communicate a control channel even when communication is performed by applying a configuration of the control channel different from those of legacy LTE systems, a user terminal according to the present invention includes: a reception section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls monitoring of a downlink control channel candidate, and the control section controls allocation of a number of downlink control channel candidates to each of the control resource sets assuming that the number of downlink control channel candidates configured to a combination of the control resource sets in a given time unit does not exceed terminal capability.

公开(公告)号：US10651982B2

公开(公告)日：2020-05-12

申请号：US16075541

申请日：2017-02-03

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Kazuki Takeda ,  Satoshi Nagata ,  Qin Mu

IPC: H04L1/18 ,  H04W72/04 ,  H04W28/04 ,  H04B1/713 ,  H04L5/00

Abstract: Disclosed is to properly perform retransmission control of a downlink signal (e.g., a downlink shared channel) in a future radio communication system. The present invention provides a user terminal comprising a reception section that receives downlink control information and a control section that determines, based on the downlink control information, a single subcarrier that is used for transmission of retransmission control information of a downlink shared channel.

公开(公告)号：US10594429B2

公开(公告)日：2020-03-17

申请号：US15574111

申请日：2016-05-13

Applicant: NTT DOCOMO INC.

Inventor： Ruifeng Ma ,  Liu Liu ,  Qin Mu ,  Huiling Jiang

IPC: H04W4/70 ,  H04J13/00 ,  H04L1/08 ,  H04L27/34 ,  H04W72/04

Abstract: Provided are a data transmitting method, a data receiving method, a data transmitting device and a data receiving device. The data transmitting method comprises: modulating data in a first modulation manner to generate a first symbol stream; decomposing the first symbol stream into a pre-determined number of second symbol streams, each of which is modulated in a modulation manner with a modulation order lower than a modulation order of the first modulation manner; processing the pre-determined number of second symbol streams to generate a code-division-multiplexed data stream; and processing the code-division-multiplexed data stream to send the processed data stream. With the methods and the devices, reliability for data transmission can be improved.

公开(公告)号：US20200015235A1

公开(公告)日：2020-01-09

申请号：US16483303

申请日：2018-02-02

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Qin Mu ,  Xu Zhang ,  Liu Liu ,  Huiling Jiang

IPC: H04W72/04 ,  H04W72/12 ,  H04B7/0456 ,  H04L5/10 ,  H04L5/00

Abstract: The present invention is designed to reduce the deterioration of communication quality and so on even when communication is performed by applying different configurations than in existing LTE systems. A receiving section that receives a downlink control channel, and a control section that controls receipt of the down link control channel, are provided, the downlink control channel is transmitted using downlink control channel elements including a plurality of resource element groups (REGs), and the control section controls receiving processes per REG group comprised of a plurality of REGs.

公开(公告)号：US10433295B2

公开(公告)日：2019-10-01

申请号：US15759127

申请日：2017-01-06

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Satoshi Nagata ,  Qin Mu ,  Liu Liu ,  Huiling Jiang

IPC: H04W72/04 ,  H04W4/70 ,  H04L1/08

Abstract: A user device communicates with a base station in a narrowband radio communication system using a physical downlink control channel or a physical downlink shared channel that includes multiple resources of a predetermined unit in a time domain. The user device includes an acquirer that obtains a repetition number indicating a number of times each of the multiple resources is repeatedly and consecutively transmitted in the time domain, and a receiver that receives, from the base station, the physical downlink control channel or the physical downlink shared channel in which each of the multiple resources is consecutively repeated the number of times indicated by the repetition number.

公开(公告)号：US10432254B2

公开(公告)日：2019-10-01

申请号：US15894676

申请日：2018-02-12

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Ruifeng Ma ,  Qin Mu ,  Liu Liu ,  Huiling Jiang

IPC: H04B1/7156 ,  H04B1/713 ,  H04B7/12 ,  H04W16/28 ,  H04W72/04 ,  H04B1/7143 ,  H04B1/7136

Abstract: A user terminal is disclosed including a receiver that receives a downlink signal that is transmitted in repetitions in narrow bands to which frequency hopping is applied, and a processor that specifies a pattern of the applied frequency hopping based on a starting index that indicates a first narrow band in the narrow bands and a frequency offset that is a shift in a frequency direction from the first narrow band. The processor causes the receiver to receive the downlink signal using the specified pattern. Each of the narrow bands is a part of a system band. The user terminal communicates using the narrow bands only. The downlink signal starts being allocated to the first narrow band.

公开(公告)号：US20190075490A1

公开(公告)日：2019-03-07

申请号：US16085188

申请日：2017-03-14

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Qin Mu ,  Liu Liu ,  Huiling Jiang

IPC: H04W28/06 ,  H04W4/70 ,  H04W48/10 ,  H04W48/16 ,  H04L1/00

CPC classification number: H04W24/04 ,  H04L1/0031 ,  H04W4/06 ,  H04W4/70 ,  H04W28/06 ,  H04W48/10 ,  H04W48/16

Abstract: The present invention is designed to provide a master information block (MIB) suitable for an NB-IoT communication system. A base station according to an embodiment of the present invention includes a generation section that generates a master information block (MIB) including parameters selected based on an operation mode during narrow band communication, and a transmission section that transmits the MIB.

公开(公告)号：US10075975B2

公开(公告)日：2018-09-11

申请号：US15024861

申请日：2014-09-10

Applicant: NTT DOCOMO, INC.

Inventor： Shimpei Yasukawa ,  Qin Mu ,  Liu Liu ,  Lan Chen ,  Huiling Jiang

IPC: H04W74/00 ,  H04W72/04 ,  H04W28/06 ,  H04W72/12 ,  H04W88/02 ,  H04W88/08

CPC classification number: H04W74/002 ,  H04W28/06 ,  H04W72/0413 ,  H04W72/042 ,  H04W72/1289 ,  H04W88/02 ,  H04W88/08

Abstract: The present invention is designed so that communication overhead pertaining to control signals is reduced in a communication system in which the bandwidth of a physical downlink shared channel is narrower than the system bandwidth. The radio base station of the present invention has a resource allocation section that allocates a physical downlink shared channel to a predetermined narrow band in a downlink system bandwidth, for a user terminal, and a downlink control information generating section that generates downlink control information to report to the user terminal, and the downlink control information generating section determines the size of a field pertaining to resource allocation information, included in downlink control information related to the physical downlink shared channel, based on the narrow band where the physical downlink shared channel is allocated.

公开(公告)号：US10069616B2

公开(公告)日：2018-09-04

申请号：US15114172

申请日：2015-01-23

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Kazuki Takeda ,  Satoshi Nagata ,  Liu Liu ,  Qin Mu ,  Huiling Jiang

IPC: H04L5/14 ,  H04W72/04 ,  H04L5/00 ,  H04L1/18 ,  H04W88/02 ,  H04W88/08

Abstract: Some techniques are disclosed for determining downlink control information for use in each cell in carrier aggregation using a FDD cell and a TDD cell together. One aspect of the present invention relates to user equipment, comprising: a transmission and reception unit configured to transmit and receive a radio channel to/from a base station via multiple cells configured for carrier aggregation in accordance with a frequency division duplex (FDD) mode and a time division duplex (TDD) mode; a cell management unit configured to manage the multiple cells; and a communication control unit configured to determine whether a duplex mode applied to a primary cell in the multiple cells is either the FDD mode or the TDD mode and receive and demodulate downlink control information compliant with the determined duplex mode for each carrier aggregation implemented cell.

公开(公告)号：US20180167169A1

公开(公告)日：2018-06-14

申请号：US15891255

申请日：2018-02-07

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Huiling Jiang ,  Liu Liu ,  Qin Mu

IPC: H04L1/08 ,  H04W72/04 ,  H04W28/04

CPC classification number: H04L1/08 ,  H04L1/1854 ,  H04W4/70 ,  H04W28/04 ,  H04W72/04 ,  H04W72/042

Abstract: A user terminal is disclosed that has a receiver that receives transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle and a processor that controls retransmission of the uplink data channel based on the transmission acknowledgment information. Further, a radio base station is disclosed that communicates with a user terminal. The radio base station has a transmitter that transmits transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle and a processor that controls transmission of the transmission acknowledgment information. The feedback timing for the transmission acknowledgment information is adjusted based on the starting subframe.