知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

57 records (took 0.02 seconds)

    WIRELESS COMMUNICATION METHOD AND BASE STATION
    1.
    发明申请
    WIRELESS COMMUNICATION METHOD AND BASE STATION 有权

    公开(公告)号：US20220191931A1

    公开(公告)日：2022-06-16

    申请号：US17439892

    申请日：2020-03-11

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Toshiro NAKAHIRA ,  Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

    IPC: H04W74/08 ,  H04L5/00

    Abstract: A wireless communications method for connecting a base station with each of a plurality of terminal stations, the base station being equipped with a plurality of wireless communications units each configured to be able to selectively enable or disable an RTS/CTS function and a NoACK function and connectable with one or more of the terminal stations, includes: a collection step of collecting information as to whether each of the terminal stations is a hidden terminal and information about transmission characteristics of each of the terminal stations; a policy calculation step of calculating a setting policy for enabling or disabling the RTS/CTS function and the NoACK function for each of the wireless communications units and a switching policy for setting a condition for switching that one of the wireless communications units which is to be connected, for each of the terminal stations, based on the collected information; and a setting step of setting those of the terminal stations which are to be connected, for each of the wireless communications units based on the calculated setting policy and switching policy.

    RADIO BASE STATION USING DISTRIBUTED ANTENNA AND SCHEDULING METHOD
    2.
    发明申请
    RADIO BASE STATION USING DISTRIBUTED ANTENNA AND SCHEDULING METHOD 有权

    公开(公告)号：US20210392524A1

    公开(公告)日：2021-12-16

    申请号：US17269285

    申请日：2019-08-13

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Koichi ISHIHARA ,  Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Toshiro NAKAHIRA ,  Yasushi TAKATORI ,  Takafumi HAYASHI

    IPC: H04W24/08 ,  H04B7/024 ,  H04W52/36 ,  H04B7/0452

    Abstract: Provided is a wireless base station which uses distributed antennas and selects a combination of a plurality of wireless terminals and the distributed antennas of a wireless base station that performs multi-user transmission with respect to the plurality of wireless terminals in a multi-BSS wireless environment. The wireless base station includes: a scheduling unit that measures reception power (RSSI) from each wireless terminal at each of the distributed antennas and selects a combination of a plurality of wireless terminals and a plurality of antennas having approximately the same RSSIs in descending order for respective wireless terminals; and a transmission power control unit that sets minimum transmission power corresponding to the RSSI of the antenna when multi-user transmission is performed between the plurality of wireless terminals and the plurality of antennas combined by the scheduling unit.

    BASE STATION AND CONTROL METHOD THEREOF
    3.
    发明申请
    BASE STATION AND CONTROL METHOD THEREOF 审中-公开

    公开(公告)号：US20190386724A1

    公开(公告)日：2019-12-19

    申请号：US16480122

    申请日：2018-01-25

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Tomoki MURAKAMI ,  Koichi ISHIHARA ,  Yasushi TAKATORI ,  Hirantha ABEYSEKERA ,  Mamoru AKIMOTO ,  Masato MIZOGUCHI

    IPC: H04B7/06 ,  H04W72/04 ,  H04W68/00

    Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.

    OPTICAL TRANSMISSION SYSTEM, PHASE COMPENSATION METHOD, AND OPTICAL RECEPTION APPARATUS
    5.
    发明申请
    OPTICAL TRANSMISSION SYSTEM, PHASE COMPENSATION METHOD, AND OPTICAL RECEPTION APPARATUS 审中-公开
    光传输系统，相位补偿方法和光接收装置

    公开(公告)号：US20150372766A1

    公开(公告)日：2015-12-24

    申请号：US14766635

    申请日：2014-02-13

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Mitsuteru YOSHIDA ,  Etsushi YAMAZAKI ,  Seiji OKAMOTO ,  Hiroyuki UZAWA ,  Kengo HORIKOSHI ,  Koichi ISHIHARA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA ,  Naoki FUJIWARA ,  Tomoyoshi KATAOKA ,  Kazushige YONENAGA

    IPC: H04B10/61 ,  H04B10/2507 ,  H04J14/06 ,  H04B10/516

    CPC classification number: H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

    Abstract: An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

    Abstract translation: 抑制电路规模的增加，并且补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间歇地插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，基于由导频符号检测单元检测的导频符号和预定的参考符号，计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。

    COMMUNICATION CONTROL METHOD, CONTROL STATION, AND COMMUNICATION CONTROL PROGRAM
    7.
    发明公开
    COMMUNICATION CONTROL METHOD, CONTROL STATION, AND COMMUNICATION CONTROL PROGRAM 审中-公开

    公开(公告)号：US20230362828A1

    公开(公告)日：2023-11-09

    申请号：US17911570

    申请日：2020-03-17

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Toshiro NAKAHIRA ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Yasushi TAKATORI

    IPC: H04W52/24

    CPC classification number: H04W52/24 ,  H04W88/08

    Abstract: A communication control method for controlling transmission powers transmitted by a plurality of base stations in a coverage area, the coverage area being covered by the plurality of base stations includes setting a transmission power of each base station to a maximum, calculating, for each base station, a percentage of an individual coverage area with respect to the coverage area when the transmission power of each base station is set to the maximum, the individual coverage area serving as a range in which each base station individually accommodates a terminal station, reducing, when a maximum value of the calculated percentages deviates from an average value by a predetermined value or greater, the transmission power of any of the plurality of base stations with the maximum percentage value, newly calculating, for each base station, a percentage of the individual coverage area with respect to the coverage area, and continuing the control until the maximum value of the calculated percentages deviates from the average value by less than the predetermined value.

    METHOD OF DETERMINING LOCATION FOR INSTALLING MOVEABLE BASE STATION AND INFORMATION PROCESSING APPARATUS
    8.
    发明公开
    METHOD OF DETERMINING LOCATION FOR INSTALLING MOVEABLE BASE STATION AND INFORMATION PROCESSING APPARATUS 审中-公开

    公开(公告)号：US20230247441A1

    公开(公告)日：2023-08-03

    申请号：US18004950

    申请日：2020-08-25

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Toshiro NAKAHIRA ,  Motoharu SASAKI ,  Koichi ISHIHARA ,  Takatsune MORIYAMA ,  Yasushi TAKATORI

    IPC: H04W16/18

    CPC classification number: H04W16/18

    Abstract: A method of determining a location at which a movable base station is to be installed is provided. In the method, an information processing device performs first determination processing of determining a base station providing radio communication that does not satisfy a predetermined condition based on information of a radio signal of each base station, second determination processing of determining a number of virtual terminals to be set in a coverage area of the base station providing the radio communication that does not satisfy the predetermined condition based on the information of the radio signal of the base station, and third determination processing of determining the location at which the movable base station is to be installed based on a location of each virtual terminal set in the coverage area of the base station providing the radio communication that does not satisfy the predetermined condition.

    WIRELESS COMMUNICATION SYSTEM, BASE STATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM
    9.
    发明公开
    WIRELESS COMMUNICATION SYSTEM, BASE STATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM 审中-公开

    公开(公告)号：US20230142888A1

    公开(公告)日：2023-05-11

    申请号：US17796137

    申请日：2020-01-28

    Applicant: Nippon Telegraph and Telephone Corporation

    Inventor： Hirantha ABEYSEKERA ,  Toshiro NAKAHIRA ,  Shoko SHINOHARA ,  Koichi ISHIHARA ,  Yasushi TAKATORI

    IPC: H04W48/06

    CPC classification number: H04W48/06

    Abstract: In a wireless communication system including a plurality of base stations to which one or more terminal stations are connectable, and a base station control device which controls each of the base stations, the base station control device includes an information collection unit configured to collect connection information regarding the terminal stations connected to the base stations from each of the base stations, a list generation unit configured to generate a white list indicating the terminal stations which are allowed to be connected to the base stations for each of the base stations based on the connection information, and a transmission unit configured to transmit the white list generated by the list generation unit to each of the base stations, and each of the base stations includes a reception unit configured to receive the white list transmitted by the transmission unit, and a setting unit configured to perform setting so as to allow or inhibit connection of each of the terminal stations to the base station based on the white list received by the reception unit.

Patent Agency Ranking