Nippon Telegraph and Telephone Corporation

Hitachi-High-Technologies Corporation

Hitachi, Ltd.

Shin-Etsu Polymer Co., Ltd.

Hokkaido University

Omron Corporation

Funai Electric Company Ltd.

Nec Corporation

Nec Electronics Corporation

The University of Tokyo

Tokyo University of Agriculture and Technology

Shin-Etsu Polymer

Atsushi Taniguchi

Yukihiro Shibata

Taketo Ueno

Kenji Shimizu

Takahiro Yamazaki

Maiko Naya

Yohei Katayama

Takeru Inoue

Kohei Mizuno

Tatsuo Hariyama

Shunji Maeda

Masahiro Watanabe

Toshifumi Honda

Shunichi Matsumoto

Kenji Maruno

Riichi Kudo

Toshiyuki Kawaguchi

Takashi Gonda

Toshihiko Nakata

Yuta Urano

Kazuhiko Oka

Hironao Fujiki

Takashi Shimizu

Kazutoki Tahara

Hiroshi Okabe

Toru Mano

Satoshi Tamura

Shigeki Otsuka

Yuichi Ito

Tsutomu Aso

Kota Hirai

Takashi Fujii

Tetsuya Matsui

Hidehiko Takara

Ippei Shake

Hiroshi Toshiyoshi

Norihisa Okada

Takuya Takahashi

Yoshiaki Sone

Shuichi Baba

Kazuya Anazawa

Akio Yazaki

Yukio Tsukishima

Masaaki Nishino

Yukitoshi Otani

Toshitaka Wakayama

Naohide Nagatsu

Wataru Imajyuku

Takayuki Yamada

Norihito Yasuda

Tomohiro Mizuno

Kazuhisa Yamada

Shun'ichi Matsumoto

Kentaro Motohara

Kengo Nakamura

Masakazu Ishihata

Shunichi Takagi

According to the present invention, a measured distance is corrected in accordance with change in the surrounding environment. A distance measurement system includes: a first light-receiving unit configured to irradiate an object with one part of a split light beam as assessment light, and receive light reflected by the object to detect a target assessment beat signal; a second light-receiving unit configured to guide the other part of the split light beam as reference light to a reference optical path serving as a distance reference, and receive the reference light that has passed through the reference optical path to detect a reference optical path assessment beat signal; a distance measurement unit configured to measure a distance to the object on the basis of the target assessment beat signal and the reference optical path assessment beat signal; a temperature sensor configured to assess a temperature in the periphery of the reference optical path; and a correction unit configured to correct the measured distance on the basis of the assessed temperature.

Distance measurement system and distance measurement method

An object is to provide a communication system and a terminal capable of predicting future communication quality in order to enable variations in communication quality due to variations in environment to be addressed. A communication system and a terminal according to the present invention learn an input and output relationship from terminal information such as surrounding environment information of the terminal that can be acquired by a camera, a sensor, or the like, and position information of the terminal and current communication quality to generate a learning model, and predict future communication quality using the learning model, the surrounding environment information and the terminal information.

Communication system and terminal

Quality of communication between a terminal and an external communication device in response to control of the terminal is predicted by acquiring surrounding environment information or/and terminal information of the terminal, and the terminal is controlled to improve the communication quality, avoid fatal communication quality degradation, or satisfy a control condition of the terminal for the communication quality, thereby realizing control that satisfies a predefined required condition related to communication.

Terminal and communication system

It is an objective of the present disclosure to reduce computational complexity for obtaining a network topology configuration capable of efficiently accommodating a plurality of traffic demands assumed between nodes present in a network. A device of the present disclosure includes: a computation traffic generation unit that creates a traffic demand matrix whose elements are values individually obtained by demands between nodes present in a target network area from a plurality of traffic demand matrices created based on predicted traffic demands between the nodes; and a network topology generation unit that generates a network topology based on the traffic demand matrix generated by the computation traffic generation unit and port information of the nodes in the network area.

Techniques for generating network topologies that accommodate different traffic demands

An event regarding control of a terminal that significantly affects communication quality with which communication between the terminal and an external communication device is performed is predicted by acquiring surrounding information of the terminal using a surrounding environment information collection unit, and a packet loss caused in communication, communication disconnection, and communication quality that does not meet required performance are prevented using communication control to change setting related to communication, such as selection/addition/deletion of a communication counterpart, selection/change of a communication scheme, a change in modulation scheme, coding rate, and number of spatial multiplexings of communication, and a change in setting of an automatic gain controller of a receiver for communication.

Communication device and communication system

An object is to provide a communication system and a base station capable of predicting future communication quality in order to enable variations in communication quality due to variations in environment to be addressed. A communication system and a base station according to the invention learn an input and output relationship from surrounding environment information of the base station that can be acquired by a camera, a sensor, or the like, terminal information such as position information of a terminal and current communication quality to generate a learning model, and predict future communication quality using the learning model, the surrounding environment information, and the terminal information.

Communication system and base station

An object of the present disclosure is to perform automatic restoration from network failures even when complicated operations for executing a plurality of commands are required. The present disclosure relates to a network setting device that is communicatively connected to a plurality of network devices and performs a setting of the plurality of network devices. The network setting device performs a first step for determining whether a network including the plurality of network devices satisfies a predetermined operational policy. When the predetermined operational policy is not satisfied, the network setting device executes processing for: performing a second step for determining whether a reachable range of a packet expands with addition of one of one or more new candidate commands to a temporary update command sequence; deleting a command at an end of the temporary update command sequence on condition that the reachable range does not expand with addition of any one of the new commands; and then returning to the first step, until the predetermined operational policy is satisfied.

Network setting device, method and program

A base station information DB () of a base station management apparatus () stores base station information that indicates wireless schemes that can be implemented by base stations (), scheduled periods for implementation of the wireless schemes, and coverage areas of the base stations () in which wireless terminals can be accommodated. A use base station selection unit () creates a list of base stations () that can cover an entirety or part of a coverage area of a failed base station, which is a base station () that has failed, with reference to the base station information, selects a base station () that can implement an implementation-scheduled wireless scheme, which is a wireless scheme that is scheduled to be implemented by the failed base station, during a scheduled implementation period, which is the scheduled period for implementation of the implementation-scheduled wireless scheme of the failed base station, from among the base stations () included in the list, and sets the selected base station () so as to provide the implementation-scheduled wireless scheme to the coverage area of the failed base station during the scheduled implementation period.

Base station management method, base station management apparatus and program

Provided are a reliability estimation system and a reliability estimation method capable of reducing a calculation amount of a reliability of a plurality of networks between terminals in communication between the terminals over the plurality of networks. The reliability estimation system according to the present invention calculates, for each network, a contraction reliability R, a contraction reliability R' when nodes are contracted, and a contraction reliability R&#x2032; between the networks including the terminals, and a true value of the reliability between the terminals over the plurality of networks is between a product P1 (=R&#x2032; R) and a product P2 (=R&#x2032; R&#x2032;). Instead of calculating the true value of the reliability, only an upper limit and a lower limit are calculated, and thus, it is possible to significantly low additional remark the calculation amount.

Reliability estimation system and reliability estimation method

A distance measuring device includes a light emitting unit that outputs a measurement light, a first polarization state control unit that controls a polarization state of the measurement light output from the light emitting unit, a second polarization state control unit that controls the polarization state of the measurement light of which a polarization state is controlled by the first polarization state control unit, and an optical path switching element that selects an emission direction of the measurement light of which a polarization state is controlled by the second polarization state control unit, in which the second polarization state control unit controls the polarization state of the measurement light so that the measurement lights are emitted from the optical path switching element in a plurality of the emission directions, and the optical path switching element receives a reflected light obtained by reflecting the emitted measurement light by an object.

Distance measuring device, distance measuring method, and three-dimensional shape measuring apparatus

A shape of an object is measured with a high degree of accuracy. A shape measurement system comprises: a distance measuring head for irradiating an object with light and receiving light reflected from the object; a distance measuring device for generating a distance detection waveform on the basis of the reflected light; and a control device for analyzing the distance detection waveform and calculating a measured distance value to the object. The shape measurement system is characterized in that the control device calculates a feature amount of the distance detection waveform and performs at least one of a process of correcting an error in the measured distance value by substituting the feature amount into a correction formula and a process of performing a confidence weighting of an error in the measured distance value by substituting the feature amount into a confidence weighting formula.

Shape measuring system and shape measuring method

A communication control apparatus includes a communication parameter acquisition unit that acquires at least one second communication parameter that is a candidate for a first communication parameter indicating a communication parameter to be assigned to a communication apparatus and indicates a communication parameter suitable for regional characteristics indicating a communication environment in a region where the communication apparatus is installed, a setting file storage unit that stores a setting file corresponding to each second communication parameter, a setting file acquisition control unit that acquires the setting file and stores the acquired setting file in the setting file storage unit, and a communication parameter assignment unit that determines the first communication parameter from among the second communication parameters acquired by the communication parameter acquisition unit and assigns the determined first communication parameter to the communication apparatus.

Communication control device, communication control method and communication control system

A radio communication method executed by a control apparatus controlling a base station apparatus performing communication with a terminal in a predetermined region, and includes determining whether there is the terminal that is asynchronized in communication with the base station apparatus transmitting a synchronization signal, and controlling, in a case where it is determined that there is the asynchronized terminal, the base station apparatus to increase an allocation time of the synchronization signal in compliance with a radio scheme used by the asynchronized terminal or to shorten an allocation cycle of the synchronization signal.

Wireless communication method, control device, terminal and wireless communication system

A wireless communication method is executed by a wireless communication system including one or more wireless terminals and a wireless communication apparatus. The wireless communication apparatus generates wireless scheme schedule information, which is information related to a schedule of a slot allocated to an uplink signal and a downlink signal of a predetermined wireless scheme, generates a downlink signal to be transmitted in the slot to the wireless terminal based on the wireless scheme schedule information, and transmits a beacon signal including the wireless scheme schedule information in the slot. The wireless terminal receives the beacon signal, in the slot, acquires the wireless scheme schedule information from the beacon signal, and generates an uplink signal to be transmitted in the slot to the wireless communication apparatus, based on the wireless scheme schedule information.

Wireless communication method, wireless communication device and wireless communication system for slot allocation

An environmental information acquisition method is performed by an environmental information acquisition apparatus that acquires a measurement result of a radio wave environment. The environmental information acquisition method includes distributing software of each radio scheme to one or more base station apparatuses measuring a radio wave environment of the radio scheme based on the software of the radio scheme, instructing the one or more base station apparatuses to measure the radio wave environment, and acquiring the measurement result of the radio wave environment from the one or more base station apparatuses measuring based on the software the radio wave environment in multiple sections set across an area.

Environment information acquisition method, environment information acquisition apparatus and environment information acquisition system

Growing community of inventors

Tokyo, Japan

Atsushi Taniguchi