Patents Assigned to NEC Communication Systems, Ltd.
  • Publication number: 20210112482
    Abstract: A car-loaded communication apparatus comprises: an acquisition part; and a selection part. The acquisition part acquires car information related to a state of a car in which a communication network is constructed inside, or an environment in which the car is placed. The selection part selects a communication route of a flow accommodating a transmission packet(s) from a plurality of communication routes included in the communication network, based on: the car information; and communication route information related to a communication route(s) included in the communication network.
    Type: Application
    Filed: April 24, 2019
    Publication date: April 15, 2021
    Applicant: NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Takumi NOMURA, Tetsuji KAWATSU, Katsuyuki AKIZUKI, Yuji HARADA, Akira MATSUMOTO, Yuki BABA
  • Publication number: 20200394415
    Abstract: An object detection apparatus comprising: an input part configured to input video data, an extraction part configured to extract image data from the video data, and a determination part configured to determine whether or not the image data includes an object, wherein the determination part is configured to: set a plurality of regions in a learning image data such that the object appearing in the learning image data extracted from a learning video data captured in advance extends over at least the plurality of regions, assign a learning teach label to each of the regions set, and determine whether or not the image data includes the object by using a prediction model generated by utilizing the learning teach label assigned to each of the regions set.
    Type: Application
    Filed: December 5, 2018
    Publication date: December 17, 2020
    Applicant: NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Noriyuki AOKI, Masanori TAKAOKA, Tetsuya ITO, Hiroki YOKOTA
  • Publication number: 20200342758
    Abstract: A drive assistance device includes: a collection unit that collects, from a sensor, own-vehicle-state-information representing a state related to a movement of an own vehicle and a position of the own vehicle; a communication unit that transmits the own-vehicle-state-information to another vehicle, and also receiving another-vehicle-state-information representing a state related to a movement of the another vehicle and a position of the another vehicle, from the another vehicle; a determination unit that determines whether a problem occurs in relation to the another vehicle, based on the another-vehicle-state-information being received; and a generation unit that generates, when the determination unit determines that the problem occurs in relation to the another vehicle, improvement operation information representing an operation of the own vehicle capable of improving the problem related to the another vehicle, based on the own-vehicle-state-information and the another-vehicle-state-information.
    Type: Application
    Filed: December 19, 2018
    Publication date: October 29, 2020
    Applicant: NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Yuki BABA, Akira MATSUMOTO, Tetsuya ITO, Chikashi ITO
  • Publication number: 20200125355
    Abstract: A software update device includes a communication unit connected with an electronic device that executes software, and a wake-up receiving unit. When the wake-up receiving unit receives a wake-up request from a wireless access point registered in advance, the wake-up receiving unit allows the communication unit to transition from a sleep state to a wake-up state. When the communication unit transitioned to the wake-up state, the communication unit initiates wireless communication with an external device, and updates the software of the electronic device by update software received from the external device.
    Type: Application
    Filed: June 11, 2018
    Publication date: April 23, 2020
    Applicant: NEC COMMUNICATION SYSTEMS, LTD.
    Inventor: Stefan AUST
  • Patent number: 10356844
    Abstract: A communication device includes a wireless communication unit, an in-transmission information generating unit, and a neighboring signal presence information generating unit. The wireless communication unit transmits and receives wireless frames via an antenna. The in-transmission information generating unit generates in-transmission information representing whether or not a wireless frame is being transmitted from the antenna. The neighboring signal presence information generating unit generates neighboring signal presence information representing whether or not a signal of a predetermined level or higher is present on a wireless channel that is the same as a wireless channel of the wireless frame.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: July 16, 2019
    Assignee: NEC Communication Systems Ltd.
    Inventors: Akira Matsumoto, Peng Shao, Yuki Baba
  • Patent number: 10334628
    Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: June 25, 2019
    Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTERNATIONAL
    Inventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Hiroyuki Yomo, Takatoshi Kimura, Akio Hasegawa
  • Patent number: 10313974
    Abstract: A base station includes a wakeup signal transmission part transmitting transmission signal information to a wireless terminal by wireless communication. The transmission signal information includes a wakeup signal starting a given function included by the wireless terminal. The wakeup signal transmission part transmits the transmission signal information including connection information in addition to the wakeup signal to the wireless terminal. The connection information is information for causing the wireless terminal of a destination of transmission of the wakeup signal to connect by wireless communication using the given function.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: June 4, 2019
    Assignees: NEC COMMUNICATION SYSTEMS, LTD., NEC CORPORATION
    Inventors: Yukihiro Hara, Yohei Miyama, Tomonori Kumagai, Shinji Masuda, Kenki Takagi
  • Patent number: 10244558
    Abstract: A wireless communication terminal has: a wireless module part which transmits a radio frame signal; a transmission loss information detection part which detects transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part which detects collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part which controls a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: March 26, 2019
    Assignee: NEC Communication Systems, Ltd.
    Inventors: Yuki Baba, Akira Matsumoto, Peng Shao
  • Patent number: 10194392
    Abstract: When a terminal device initiates a wireless communication when it has not established a wireless link between itself and another wireless device, it transmits, as a management frames in active scanning, a plurality of activation probe requests having frame lengths representing an identifier of a wireless base station to which connection is being made and which is intended to transition from sleep mode to operating mode. Then, the wireless base station receives the plurality of activation probe requests transmitted by the terminal device as management frames in active scanning in a wireless LAN, and, when a plurality of dummy network identifiers detected based on the received plurality of activation probe requests represent the identifier of its own, transitions from sleep mode to operating mode.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: January 29, 2019
    Assignees: ADVANCED TELECOMMUNICATIONS RESERACH INSTITUTE INTERNATIONAL, NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Masahito Iwai, Yukihiro Hara, Tetsuya Ito, Takatoshi Kimura, Akio Hasegawa
  • Patent number: 10165603
    Abstract: A transmission part transmits a packet by radio. A power detection part performs, at a given cycle, sampling of power of a spatial radio signal in a packet transmission period during which the transmission part transmits the packet. A collision detection part calculates, as an index value, at least one of the average value and the degree of variation of power of the spatial radio signal in the packet transmission period on the basis of sampled data obtained in the sampling by the power detection part. The collision detection part also determines a reference value on the basis of transmission power of the packet. The collision detection part detects whether or not collision of the packet is present by comparing the index value with the reference value.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: December 25, 2018
    Assignee: NEC Communication Systems, Ltd.
    Inventors: Peng Shao, Akira Matsumoto, Ikumi Wada, Yuki Baba
  • Patent number: 9999075
    Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: June 12, 2018
    Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INT
    Inventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Hiroyuki Yomo, Takatoshi Kimura, Akio Hasegawa
  • Patent number: 9989939
    Abstract: A wireless device (1) searches a database that stores positional information of the wireless device (1), a device (2-4) and control identifiers for controlling the devices (2-4) in an associated manner, acquires a device (2-4) located near the wireless device (1) and a control identifier for controlling the device (2-4) based on the positional information of the wireless device (1), and, based on the device (2-4) and the control identifier for controlling the device (2-4) that have been acquired, determines a controlled device (at least one of the devices (2-4)) and generates a control identifier for the controlled device. The wireless device (1) transmits, by wireless communication, the generated controlled identifier to a receiver mounted on the controlled device to control the controlled device.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: June 5, 2018
    Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INT
    Inventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Yuma Asada, Yuta Okamoto, Shota Kakibuti, Ryou Nagase, Shohei Fukayama, Hironori Fukui, Noboru Miyamoto, Hiroyuki Yomo, Takatoshi Kimura, Suhua Tang, Akio Hasegawa
  • Patent number: 9973247
    Abstract: The solution of the present invention is a precoding that allows an optimal use of multiple-antennas in a MIMO system. The precoding uses codebooks that are optimized for long-range wireless transmissions. A modified Kerdock codebook {wkmi} allows further improvement of the precoding gain. The modified Kerdock codebook {wkmi} contains new codewords wkmi that have been modified in order to further improve the transmit bit error rate (BER). The modified codebook {wkmi} allows a precoding gain that is between 2-3 dB. The present invention improves the transmit bit error rate (BER) of a wireless system. It allows a longer range in outdoor MIMO systems. Less signal outage is the result which allows that wireless signals can be transmitted over several kilometers.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: May 15, 2018
    Assignee: NEC Communication Systems, Ltd.
    Inventor: Stefan Aust
  • Publication number: 20170231030
    Abstract: A communication device includes a wireless communication unit, an in-transmission information generating unit, and a neighboring signal presence information generating unit. The wireless communication unit transmits and receives wireless frames via an antenna. The in-transmission information generating unit generates in-transmission information representing whether or not a wireless frame is being transmitted from the antenna. The neighboring signal presence information generating unit generates neighboring signal presence information representing whether or not a signal of a predetermined level or higher is present on a wireless channel that is the same as a wireless channel of the wireless frame.
    Type: Application
    Filed: August 3, 2015
    Publication date: August 10, 2017
    Applicant: NEC Communication Systems Ltd.
    Inventors: Akira MATSUMOTO, Peng SHAO, Yuki BABA
  • Publication number: 20170093470
    Abstract: The solution of the present invention is a precoding that allows an optimal use of multiple-antennas in a MIMO system. The precoding uses codebooks that are optimized for long-range wireless transmissions. A modified Kerdock codebook {wkmi} allows further improvement of the precoding gain. The modified Kerdock codebook {wkmi} contains new codewords wkmi that have been modified in order to further improve the transmit bit error rate (BER). The modified codebook {wkmi} allows a precoding gain that is between 2-3 dB. The present invention improves the transmit bit error rate (BER) of a wireless system. It allows a longer range in outdoor MIMO systems. Less signal outage is the result which allows that wireless signals can be transmitted over several kilometers.
    Type: Application
    Filed: May 23, 2014
    Publication date: March 30, 2017
    Applicant: NEC Communication Systems, Ltd
    Inventor: Stefan AUST
  • Patent number: 9554330
    Abstract: A wireless communication device 81 operates in either a ROD mode or a non-ROD mode. The non-ROD mode sets the state of the device to an active state that the device can perform wireless communication compliant with a first communication scheme with a communication destination device 82. The ROD mode: sets the state of the device to either the active state or a sleep state that the device can receive an activation instruction signal compliant with a second communication scheme requiring smaller electric power to receive a signal than the first communication scheme and cannot perform wireless communication compliant with the first communication scheme with the communication destination device; sets the state of the device to the sleep state when a predetermined sleep condition is satisfied; and sets the state of the device to the active state when the device receives the activation instruction signal.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: January 24, 2017
    Assignee: NEC Communication Systems, Ltd.
    Inventors: Stefan Aust, Toshiyasu Tanaka, Tetsuya Ito
  • Publication number: 20170013556
    Abstract: In order to solve a problem that, when a plurality of wireless communication modes are simultaneously used, interference between the plurality of wireless communication modes cannot be effectively prevented, a wireless communication control device according to the present invention includes a first communication mode control unit performing wireless communication in a first wireless communication mode, and a second communication mode control unit performing wireless communication in a second wireless communication mode. The second communication mode control unit detects a start of wireless communication in the first wireless communication mode, operates not to perform wireless communication in the second wireless communication mode during a wireless communication period in the first wireless communication mode, and operates to perform wireless communication in the second wireless communication mode outside a wireless communication period in the first wireless communication mode.
    Type: Application
    Filed: February 23, 2015
    Publication date: January 12, 2017
    Applicant: NEC Communication Systems, Ltd
    Inventors: Toshiyasu TANAKA, Stefan AUST
  • Publication number: 20170006540
    Abstract: A wireless base station (1) includes a wakeup device (13) and a main device (14). When the main device (14) is in a sleep mode, the wakeup device (13) is connected to the antenna (11). Then, when the wakeup device (13) receives a wakeup signal for activating the wireless base station (1) from a terminal device assigned to the wireless base station (1) in a communication band used for wireless communication with the terminal device and when the information for identifying a wireless base station to be activated contained in the received wakeup signal is identical with the identification information of the wireless base station (1), the wakeup device (13) outputs a driving signal to the main device (14). The main device (14) transitions from the sleep mode to an operating mode in response to the driving signal from the wakeup device (13).
    Type: Application
    Filed: September 16, 2016
    Publication date: January 5, 2017
    Applicants: ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTERNATIONAL, NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Hiroyuki Yomo, Yoshihisa Kondo, Suhua Tang, Sadao Obana, Tetsuya Ito, Akira Matsumoto, Koichi Yoshimura
  • Patent number: 9532379
    Abstract: A receiver has an ID that includes three signal detection intervals (S1, S2, S3). The three signal detection intervals (S1, S2, S3) are detected as the receiver detects a signal consisting of a value larger than a threshold at each of the detection timings (DT1 to DT4). The transmitter transmits four radio frames (FR1 to FR4) such that each of the radio frames straddles the corresponding one of the detection timings (DT1 to DT4) in the receiver.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: December 27, 2016
    Assignees: ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INT, NEC COMMUNICATION SYSTEMS, LTD.
    Inventors: Yoshihisa Kondo, Hiroyuki Yomo, Suhua Tang, Takatoshi Kimura, Masahito Iwai, Tetsuya Ito
  • Publication number: 20160366702
    Abstract: A wireless communication terminal has: a wireless module part which transmits a radio frame signal; a transmission loss information detection part which detects transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part which detects collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part which controls a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information.
    Type: Application
    Filed: August 14, 2014
    Publication date: December 15, 2016
    Applicant: NEC Communication Systems, Ltd
    Inventors: Yuki BABA, Akira MATSUMOTO, Peng SHAO