Patents Assigned to NTT DoCoMo, Inc.
  • Publication number: 20190222377
    Abstract: Provided are a method for mapping a broadcast channel in a time-division-duplex(TDD)-mode base station, a method for detecting a broadcast channel in a TDD-mode user equipment, a base station and a user equipment. The method for mapping a broadcast channel includes: dividing a first broadcast channel into at least a first part and a second part; and mapping the first part of the first broadcast channel to a second subframe of a plurality of subframes included in a frame having an uplink-downlink configuration of the TDD mode, and mapping the second part of the first broadcast channel to a seventh subframe of the plurality of subframes, where the second subframe is a special subframe, and the seventh subframe is a special subframe or a downlink subframe.
    Type: Application
    Filed: August 4, 2017
    Publication date: July 18, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Jiahui LIU, Qin MU, Liu LIU, Huiling JIANG
  • Publication number: 20190223119
    Abstract: Provided is a power control technique for a user equipment that supports high transmission power. An aspect of the invention relates to user equipment that supports a first power class in a certain frequency band, the user equipment including a transceiver that transmits radio signals to and receives radio signals from a base station; and a transmission power controller that controls transmission power to the base station, wherein, upon accessing the base station in the frequency band provided with, as a default power class, a second power class that is lower than the first power class, the transmission power controller controls the transmission power in accordance with a regulation of the default power class, and the transmission power controller controls the transmission power so that the transmission power becomes less than or equal to maximum output power of the default power class.
    Type: Application
    Filed: June 1, 2017
    Publication date: July 18, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Hiromasa Umeda, Kei Andou
  • Publication number: 20190223107
    Abstract: The present invention is designed to control transmission power properly even when communication is controlled based on shortened processing time. A user terminal communicates in a cell where a shortened TTI, having a transmission time interval (TTI) length shorter than 1 ms, is used, and/or in a cell where communication is controlled based on shortened processing time, which is shorter than in existing LTE systems, and this user terminal has a receiving section that receives a DL signal, a transmission section that transmits a UL signal in response to the DL signal, and a control section that controls transmission power of the UL signal based on a power control command contained in downlink control information transmitted in a predetermined transmission time interval in which the DL signal is transmitted, or in a transmission time interval located before the predetermined transmission time interval.
    Type: Application
    Filed: September 13, 2017
    Publication date: July 18, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang
  • Publication number: 20190222363
    Abstract: Disclosed are a method for transmitting Hybrid Automatic Repeat Request (HARQ) feedback information, a user equipment, and a base station. The method includes: determining a reception window of data on which HARQ binding is to be performed; detecting data in the reception window; and bundling and transmitting HARQ feedback information for the data detected in the reception window. By means of the method, the user equipment and the base station, HARD bundling can be very conveniently implemented in a Half-Duplex (HD) frequency division multiplexing system.
    Type: Application
    Filed: August 10, 2017
    Publication date: July 18, 2019
    Applicant: NTT DOCOMO INC.
    Inventors: Qin MU, Liu LIU, Huiling JIANG, Naoto OKUBO, Kazuaki TAKEDA
  • Patent number: 10356663
    Abstract: A slice allocating method capable of dynamically changing a service and a slice to be allocated to the service is provided. An OSS/BSS holds allocation service information in which a service to which a slice has been allocated is associated with the slice. Further, a request reception unit of the OSS/BSS receives an SLA-SL which is a requirement of a function. An allocation determination unit determines a slice having an SLA-SL corresponding to a service requirement of the received service. When the service of the slice determined by the allocation determination unit is the same as the service associated with the slice in advance, an allocation request unit reallocates the service to the determined slice.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: July 16, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Takuya Shimojou, Motoshi Tamura, Masayoshi Shimizu, Ashiq Khan, Shigeru Iwashina
  • Patent number: 10356666
    Abstract: A module includes a switching request receiving unit configured to receive, when the module is connected with one terminal, a switching request indicating a connection switching to another terminal, an address changing unit configured to change the connection destination address using the reception of the switching request by the switching request receiving unit as a trigger, a connection disconnecting unit configured to forcibly disconnect the connection with the one terminal when the connection destination address is changed by the address changing unit, and a connection process executing unit configured to receive a connection request from the another terminal by the connection destination address changed by the address changing unit after the connection with the one terminal is disconnected by the connection disconnecting unit and to connect with the another terminal.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: July 16, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Akira Shibutani, Kazuma Nachi, Yuuta Higuchi
  • Patent number: 10356644
    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.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: July 16, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Satoshi Nagata, Yoshihisa Kishiyama
  • Patent number: 10356727
    Abstract: For each UE, a base station determines the number of streams for transmitting a data signal, performs different precoding on the data signal depending on the UE, and allocates different transmission powers to at least two UEs. The base station transmits streams addressed to the at least two UEs in a form in which these streams are non-orthogonally mixed, with transmission powers that are different for the UEs. For each of the streams addressed to these UEs, the base station estimates predictive indices for these UEs from channel state information determined by the UEs to which those streams are addressed, and, based on the predictive indices, allocates different transmission powers to those UEs such that the better the predictive index is, the lower the transmission power is.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: July 16, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Anass Benjebbour, Yoshihisa Kishiyama
  • Patent number: 10356731
    Abstract: A user apparatus in a mobile communication system that includes a first and second base station that perform communication with the user apparatus by inter-base station carrier aggregation. The user apparatus includes a setting information reception unit that receives, from the first base station, first setting information for instructing whether to report uplink transmission power information to the first base station, and second setting information for instructing whether to report uplink transmission power information to the second base station. A report control unit reports uplink transmission power information to the first or second base station when detecting a report trigger for performing reporting of the uplink transmission power information. When the report control unit detects a report trigger for a specific base station for which it is instructed not to perform reporting of the uplink transmission power information, the uplink transmission power information is reported to another base station.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: July 16, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Kazuki Takeda, Hideaki Takahashi
  • Publication number: 20190215854
    Abstract: Provided are a transmitting method, a receiving method, a relay device, a base station and a mobile station. According to embodiments of the present invention, the method for transmitting grant information performed by the relay device includes: receiving the grant information for inter-device transmission and a transmitting device identification and a receiving device identification corresponding to the grant information; generating first control information according to the grant information, the transmitting device identification and the receiving device identification; and transmitting the first control information.
    Type: Application
    Filed: July 13, 2017
    Publication date: July 11, 2019
    Applicant: NTT DOCOMO INC.
    Inventors: Huan WANG, Liu LIU, Qin MU, Qun ZHAO, Huiling JIANG
  • Publication number: 20190215792
    Abstract: The present application provides an uplink data transmission method and a user terminal (UE) for executing the method. The method in the present application comprises: A, generating a first random number; B, determining, according to the generated first random number, whether to initiate a random access process; if the random access process is initiated, obtaining a timing advance (TA) value from a base station by means of the random access process; and if the random access process is not initiated, listening for a TA message broadcast by another UE and obtaining a TA value from the TA message; C, transmitting uplink data according to the obtained TA value; D, if the uplink data is successfully transmitted, continuing to perform E, and if the uplink data is unsuccessfully transmitted, returning to A; and E, generating a TA message according to the obtained TA value, and broadcasting the generated TA message.
    Type: Application
    Filed: July 7, 2017
    Publication date: July 11, 2019
    Applicant: NTT DoCoMo, Inc.
    Inventors: Neng YE, Xiangming LI, Anxin LI, Xiaohang CHEN, Qun ZHAO, Huiling JIANG
  • Publication number: 20190215810
    Abstract: Disclosed are a method for determining a hybrid automatic repeat request (HARQ) process number (HPN) allocated to downlink link (DL) data, a method for notifying a HPN allocated to the DL data, a method for allocating a HPN to DL data, a base station, and a user equipment. The method for determining a HPN allocated to DL data includes: receiving DL control information (DCI) associated with DL data; determining, according to the DCI, whether the DL data satisfies a predetermined condition; and when the DL data satisfies the predetermined condition, determining the HPN allocated to the DL data based on a HPN field and an additional field in the DCI.
    Type: Application
    Filed: August 10, 2017
    Publication date: July 11, 2019
    Applicant: NTT DOCOMO INC.
    Inventors: Qin MU, Liu LIU, Huiling JIANG, Naoto OKUBO, Kazuaki TAKEDA
  • Publication number: 20190215818
    Abstract: The present invention is designed so that the transmission of PUSCH can be controlled properly when the reference value for the timing for transmitting signals is controlled in radio base stations and/or user terminals. A user terminal, according to the present invention, has a receiving section that receives downlink control information (DCI), and a control section that controls transmission of an uplink (UL) shared channel that is scheduled by the DCI, and the control section controls the transmission of the UL shared channel based on a reference value that is configured for the timing for transmitting the UL shared channel.
    Type: Application
    Filed: August 30, 2017
    Publication date: July 11, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Shaozhen Guo, Lihui Wang, Liu Liu, Xiaolin Hou, Huiling Jiang
  • Publication number: 20190215824
    Abstract: The present invention is designed to transmit uplink control information (UCI) by using UL control channels that are suitable for the requirements of user terminals in future radio communication systems. A user terminal, according to the present invention, has a transmission section that transmits uplink control information (UCI) by using an uplink (UL) control channel, and a control section that controls transmission of the UCI, and the structure of the UL control channel is selected from a plurality of structures that contain different numbers of symbols.
    Type: Application
    Filed: August 8, 2017
    Publication date: July 11, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata
  • Patent number: 10349399
    Abstract: A user device communicates with base stations in a radio communication system including the base stations. The user device includes a receiver that receives a first downlink control signal transmitted from one of the base stations, a transmitter that transmits uplink signals using multiple antenna ports or multiple beams, and a controller that controls, for each subframe, transmission timing of the uplink signals transmitted using the multiple antenna ports or the multiple beams, based on the first downlink control signal.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: July 9, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Yoshihisa Kishiyama, Daisuke Kurita
  • Publication number: 20190208495
    Abstract: Provided is a radio communication system capable of implementing a state transition related to an intermediate transition between a connected state and an idle state.
    Type: Application
    Filed: August 4, 2017
    Publication date: July 4, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Tooru Uchino, Wuri Andarmawanti Hapsari, Anil Umesh
  • Publication number: 20190208520
    Abstract: The present invention is designed so that control information and reference signals that are transmitted by using control channels can be multiplexed adequately in the UL/DL in future radio communication systems. According to the present invention, A transmission apparatus transmits control information by using a control channel, and this transmission apparatus has a multiplexing section that multiplexes the control information and a reference signal in a time domain in one symbol, and a transmission section that transmits the control information and the reference signal.
    Type: Application
    Filed: September 14, 2017
    Publication date: July 4, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Kazuaki Takeda, Satoshi Nagata
  • Publication number: 20190208509
    Abstract: The present invention is designed so that the transmission of A/Ns can be controlled properly when the reference value for the timing for transmitting signals is controlled in radio base stations and/or user terminals. A user terminal, according to the present invention, has a receiving section that receives a downlink (DL) shared channel, and a control section that controls transmission of retransmission control information in response to the DL shared channel. The control section controls the transmission of the retransmission control information based on a reference value that is configured for timing for transmitting the retransmission control information.
    Type: Application
    Filed: August 30, 2017
    Publication date: July 4, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Shaozhen Guo, Lihui Wang, Liu Liu, Xiaolin Hou, Huiling Jiang
  • Publication number: 20190207726
    Abstract: Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200A includes a target user control signal detector 230 and an interfering user control signal detector 240 which are configured to receive a control signal to be used to cancel a non-orthogonal signal by interference canceller. The control signal includes control information containing a radio resource block allocated to the non-orthogonal signal addressed to another mobile station. The mobile station 200A demodulates and cancels the radio signal addressed to the other mobile station on the basis of the control signal.
    Type: Application
    Filed: March 7, 2019
    Publication date: July 4, 2019
    Applicant: NTT DOCOMO, INC.
    Inventor: Yoshihisa KISHIYAMA
  • Publication number: 20190208504
    Abstract: A user equipment including: a selection unit that selects, based on a result of sensing performed in a first time window and on a transmission interval of a signal, one or more resource candidates in a second time window after the first time window; and a transmission unit that selects a resource for transmitting a signal from the selected one or more resource candidates, and transmits the signal.
    Type: Application
    Filed: August 10, 2017
    Publication date: July 4, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Satoshi Nagata, Qun Zhao, Jing Wang, Huan Wang, Liu Liu, Anxin Li, Huiling Jiang