Patents Assigned to NTT DoCoMo, Inc.
  • Publication number: 20190229840
    Abstract: To improve spectral usage efficiency in the case where an interrupt by a second signal occurs in a part of frequency resources allocated to a first signal, in one aspect of the present invention, in the case where frequency resources for the first signal are allocated using a second allocation unit comprised by including a plurality of first allocation units that are minimum allocation units, and in the case where the second signal is allocated to a part of the frequency resources, in a subcarrier at least a part of which overlaps with the second signal, or in the first allocation unit at least a part of which overlaps with the second signal, the first signal is subjected to rate-matching and/or puncturing.
    Type: Application
    Filed: July 12, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190229856
    Abstract: Provided is a user equipment in a radio communication system that includes a plurality of user equipments and a base station and supports a communication scheme in which uplink radio resources are shared by the plurality of user equipments, and the user equipment includes a receiving unit that receives ACK or NACK from the base station with respect to an uplink signal, a control unit that determines that retransmission of the uplink signal is performed when the receiving unit receives NACK with respect to the uplink signal or when none of ACK and NACK are received with respect to the uplink signal, and a transmitting unit that transmits an uplink signal of a next transmission timing in accordance with a first retransmission scheme when the receiving unit receives ACK or retransmits the uplink signal in accordance with a second retransmission scheme when the control unit determines that the retransmission of the uplink signal is performed.
    Type: Application
    Filed: June 23, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Kazuaki Takeda, Satoshi Nagata
  • Publication number: 20190230739
    Abstract: A user apparatus in a radio communication system including a base station and the user apparatus includes: a receiver unit configured to receive, from the base station, first designation information for designating a resource group including a plurality of resources each including a bandwidth of a predetermined number of resource blocks and second designation information for designating allocation resources in the resource group; and a communication unit configured to perform data communication using the allocation resources designated by the second designation information in the resource group designated by the first designation information.
    Type: Application
    Filed: October 3, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Huiling Jiang, Liu Liu, Qin Mu
  • Publication number: 20190229878
    Abstract: The present invention is designed so that communication can be carried out properly even when shortened TTIs are used. A user terminal communicates using a first transmission time interval (TTI) and a second TTI which has a shorter TTI duration than the first TTI, and this user terminal has a receiving section that receives first downlink control information which is transmitted from a radio base station per first TTI, and second downlink control information which is transmitted in the second TTI, and a control section that controls simultaneous reception of first downlink data which is based on the first downlink control information, and second downlink data which is based on the second downlink control information, in a same carrier, based on a given condition.
    Type: Application
    Filed: May 8, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Liu Liu, Huiling Jiang
  • Publication number: 20190230546
    Abstract: A user equipment in a wireless communication system that includes a base station and the user equipment, the user equipment includes: a reception unit that receives allocations of radio resources to be used for transmitting uplink reference signals from the base station; a measurement unit that measures reception quality of downlink signals transmitted from the base station; and a transmission unit that starts transmitting uplink reference signals using the radio resources allocated from the base station when the reception quality measured by the measurement unit satisfies a predetermined condition and stops transmission of uplink reference signals when the reception quality measured by the measurement unit does not satisfy the predetermined condition.
    Type: Application
    Filed: July 31, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Tooru Uchino, Wuri Andarmawanti Hapsari, Anil Umesh, Sadayuki Abeta
  • Publication number: 20190230630
    Abstract: Disclosed are a method for notifying a repetition pattern of uplink data, a method for determining a repetition pattern of uplink data, and a corresponding user equipment and base station. The method for notifying a repetition pattern of uplink data includes: selecting one of a plurality of repetition patterns as a repetition pattern of uplink data; and explicitly or implicitly notifying a base station of the selected repetition pattern by the uplink data. The method for determining a repetition pattern of uplink data includes: receiving uplink data; and determining a repetition pattern of the uplink data according to information included in the uplink data or a transmitting manner of the uplink data.
    Type: Application
    Filed: August 17, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Qin MU, Liu LIU, Xiaohang CHEN, Anxin LI, Huiling JIANG, Satoshi NAGATA
  • Publication number: 20190230661
    Abstract: In one aspect, a user terminal is disclosed including a processor that controls a mapping of a first demodulation reference signal (DMRS), having a fixed location regardless of a symbol duration of an uplink shared channel (PUSCH), controls a mapping of a second DMRS, which is allocated depending on the symbol duration of the PUSCH, and determines a location of the second DMRS if the second DMRS is allocated. The user terminal also includes a transmitter that transmits at least one of the first DMRS and the second DMRS.
    Type: Application
    Filed: April 2, 2019
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Tooru Uchino, Kazuaki Takeda, Satoshi Nagata
  • Publication number: 20190230635
    Abstract: The present invention is designed so that, when special subframes are allowed to transmit a PUSCH, the transmission of the PUSCH can be controlled adequately. According to the present invention, a user terminal has a receiving section that receives downlink control information (DCI) that schedules an uplink (UL) shared channel, and a control section that controls transmission of the UL shared channel by using a table that associates a subframe, in which the DCI is received, and a timing, at which the UL shared channel is transmitted, per UL/downlink (DL) configuration. The transmission timing in the table is determined based on a special subframe, which is allowed to transmit the UL shared channel, and a predetermined reference value, which is lower than 4 ms.
    Type: Application
    Filed: September 29, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Liu Liu, Huiling Jiang, Na Li, Yong Li, Wenbo Wang
  • Publication number: 20190230734
    Abstract: In a communication system in which a plurality of bearers are set up between UE and one or more PGWs, a PGW measures an idle time for each bearer and determines whether or not the measured idle time has reached an idle timer threshold value which is determined in advance for each of the plurality of bearers (Step 1). Then, when it is determined that the idle time for one bearer, for example, bearer 2, has reached the idle timer threshold value (Step 2), a PGW2 requests an MME to release bearer 2 via an SGW2 (Steps 3 and 4), and the MME performs a process of releasing bearer 2 in response to the request (Step 5 and the like).
    Type: Application
    Filed: September 20, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Takuya Shimojou, Masayoshi Shimizu, Atsushi Minokuchi, Shigeru Iwashina, Srisakul Thakolsri, Malla Reddy Sama
  • Publication number: 20190230695
    Abstract: The present invention is designed to achieve a satisfactory latency-reducing effect when a plurality of TTIs of varying time durations are used in the same carrier. A user terminal, according to the present invention, has a receiving section that receives scheduling information pertaining to a second transmission time interval (TTI), which is shorter than a first TTI, and a control section that controls receipt and/or transmission of data in the second TTI, which is embedded in the first TTI, based on the scheduling information.
    Type: Application
    Filed: May 9, 2017
    Publication date: July 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Shinpei Yasukawa, Satoshi Nagata
  • 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: 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: 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: 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: 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: 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: 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: 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