Nippon Telegraph and Telephone Corporation

Ryota Shiina

Kazutaka Hara

Tomohiro Taniguchi

Tomoki Murakami

Toshiro Nakahira

Shinya Tamaki

Satoshi Ikeda

Yasutaka Kimura

Tatsuya Fukui

Tetsuya Suzuki

Tomoya Hatano

Satoshi Narikawa

Takashi Watanabe

Katsuya Minami

Sei Kou

Yuki Sakaue

Koji Tsuji

Kazuhiko Kinoshita

Shunsuke Saruwatari

The present disclosure aims to enable a total of 127 or more USB devices to be connected on the same network regardless of connection sites. A USB connection control system of the present disclosure is a USB connection control system including a plurality of USB-network conversion devices and a management device being connected to each other via a network, in which the management device holds, per user, connection information defining a connection destination of a USB device connected to the USB-network conversion device, and at least one of the plurality of USB-network conversion devices receives, from the management device, the connection information corresponding to identification information unique to the at least one of the plurality of USB-network conversion devices and communicates with a to-be-connected USB-network conversion device based on the received connection information, and to establish connection with a USB device that is connected to the to-be-connected USB-network conversion device.

USB connection control system, USB connection control method, USB-network conversion device and program

A radio terminal station device includes a communication unit, an information acquisition unit, a threshold calculation unit, a detection unit, and a system selection unit. The communication unit selects any one of a plurality of different communication systems and performs a radio communication. The information acquisition unit acquires information including a communication state of the radio terminal station device and at least communication states of other radio terminal station devices. The threshold calculation unit calculates a threshold value for detecting deterioration of the communication state of the radio terminal station device. The detection unit detects the deterioration of the communication state of a communication system used by the radio terminal station device. The system selection unit selects an optimal communication system from among the communication systems used by the other radio terminal station devices when the deterioration of the communication state of the communication system of the radio terminal station device is detected. Thus, it is possible to maintain favorable communication quality.

Wireless terminal station device, management station device, wireless communication system and wireless communication method

The present disclosure provides a monitoring system including an edge processing apparatus including a space distinct ID management database, a space distinct ID control unit, a storage unit, an analysis unit, and an abnormality determination unit, and a controller, a transmitter, and a camera with sensor that are installed in a location to be monitored, in which the space distinct ID management database stores a space distinct ID and a transmission time of the space distinct ID in association with the location to be monitored, the space distinct ID control unit acquires the space distinct ID associated with the location to be monitored from the space distinct ID management database and transmits the space distinct ID that is acquired to the controller in the associated location to be monitored, the controller transmits the space distinct ID acquired from the space distinct ID control unit to the transmitter, the transmitter generates a signal based on the space distinct ID acquired from the controller and diffuses, in a space of the location to be monitored, the signal that is generated, the camera with sensor includes a sensor that captures an image of the location to be monitored where the camera with sensor is installed and receives the signal diffused by the transmitter, and the camera with sensor transmits a received signal received by the sensor to the storage unit, the storage unit stores the received signal received from the camera with sensor in association with the location to be monitored where the camera with sensor is installed, the analysis unit extracts a space distinct ID from the received signal stored in the storage unit and transmits the space distinct ID that is extracted to the abnormality determination unit in association with the location to be monitored, and the abnormality determination unit compares and determines whether there is a match between the space distinct ID associated with the location to be monitored from the analysis unit and current time, and the space distinct ID and the transmission time of the space distinct ID associated with the location to be monitored that are stored in the space distinct ID management database.

Monitoring system, monitoring method, and monitoring program

An object is to provide a communication system in which there are no restrictions on a communicable area and it is not necessary to install communication software on a wireless device. A communication system according to the present invention is configured so that the functions of a wireless access point are separated into a front-end unit on a wireless terminal side and a back-end side on the Internet side, radio signal processing functions supporting a wireless scheme of the wireless terminal are deployed only on the back end, and only relatively simple processing functions such as E/O conversion are deployed on the front end near the wireless terminal

Communication system

An object is to provide a terminal device, a communication method, and a communication system which are capable of acquiring accurate optical ID information regardless of the position of the terminal device and the light receiving angle. The terminal device, the communication method, and the communication system according to the present invention each sets a threshold value for the illuminance of a received optical signal by using a moving average method, a weighted moving average method, or an exponential moving average, so that the optical signal can be binarized with a threshold value according to a change in the position of the terminal device, the light receiving angle, or the like. Information from other sensors may be used to set the threshold value.

Terminal devices, communication methods, and communication systems

An object of the present invention is to provide a terminal device, a communication method, and a communication system which are capable of reducing the error rate even if the transmitting side and the receiving side are asynchronous. The terminal device, communication method, and communication system according to the present invention sample an optical signal more finely than a 0/1 bit pattern in optical ID estimation processing for determining which of 1/0 the data acquired by an optical sensor is, and perform a majority decision using a plurality of sampling values in a decision processing window. Thus, even if the correct sampling value fails to be obtained, the correct bit value can be derived from other samplings.

An object of the present disclosure is to inform a user of a safe evacuation guidance route in real time using smart lightings without deploying dedicated evacuation guidance facilities. The present disclosure is a wireless communication system including: one or more wireless base stations that wirelessly communicate with a terminal; a plurality of optical base stations that transmit an optical signal to the terminal; and a base station control device that controls the optical signal transmitted by the optical base stations, wherein the base station control device collects environment information around the optical base stations, detects a disaster around the optical base stations using the collected environment information, and when detecting a disaster, causes the optical base station installed at a position close to a disaster occurrence location and the optical base station installed at a position far from the disaster occurrence location to output light of different colors.

Wireless communication system, base station control device, evacuation guidance method, and base station control program

An object of the present disclosure is to make already installed smart lightings available as optical base stations as they are without modifying them, and perform connection/authentication control for RF communication using an optical signal sent out from the optical base stations. The present disclosure is a wireless communication system including: one or more wireless base stations that wirelessly communicate with a terminal; a base station control device that collects wireless base station information from each wireless base station, determines a wireless base station that wirelessly communicates with the terminal using the collected wireless base station information, and transmits an optical ID corresponding to the determined wireless base station; and one or more optical base stations that receive the optical ID from the base station control device, and transmit the received optical ID to the terminal using an optical signal, wherein the wireless base station determined by the base station control device wirelessly communicates with the terminal that receives the optical ID.

An object of the present disclosure is to collectively collect sensing data and metadata regarding normality of equipment by utilizing light communication protocol. The present disclosure is a system that collects sensing data from a sensor terminal in a data collection unit using a data collection network, the sensor terminal including a detection unit configured to detect metadata regarding internal information of the sensor terminal other than a sensor device that detects sensing data and equipment information and transmitting the metadata detected by the detection unit using an extended area or an optional area defined in communication protocol for transmitting the sensing data or the equipment information in a frame defined in the communication protocol, and the data collection unit associating the sensing data, the equipment information, and the metadata on the basis of information for identifying the sensor terminal described in the frame.

Systems and methods for collecting metadata and sensor terminals

An objective is to provide a communication system, a terminal, a communication method, and a program capable of improving the probability of successful authentication regardless of mobility of the terminal. The communication system according to the present invention includes a terminalincluding: a sensor unitthat senses a state of the terminal and includes at least one of an acceleration sensor, a gyro sensor, a position sensor, and a proximity sensor; an optical receiverthat receives an optical modulation signal and outputs an electrical signal; a correction circuitthat corrects the electrical signal on a basis of the state of the terminal sensed by the sensor unitwhen one of the following is true: illuminance of light received from an optical transmitterby the optical receiveris equal to or lower than an illuminance threshold value; and a signal intensity of the electrical signal output by the optical receiveris equal to or lower than an intensity threshold value; an authentication information checking circuitthat checks the authentication information contained in the electrical signal; and a terminal-side RF transmitter/receiverthat transmits the authentication information to a base stationvia RF wireless communication.

Communication systems, terminals, communication methods, and programs

A control station device includes a policy generation unit that calculates a priority order of a plurality of wireless communication systems having different types of systems on a basis of information acquired from a wireless terminal device that selects one wireless communication system from among the plurality of wireless communication systems to perform wireless communication, and generates a selection policy indicating the priority order of the plurality of wireless communication systems, and a policy delivery unit that delivers the selection policy indicating the priority order of the plurality of wireless communication systems to the wireless terminal device. With this configuration, an optimal wireless communication system that maximizes the performance of each wireless terminal device can be selected while reducing the load and calculation time imposed on the control station device.

Control station device and wireless terminal station device

An objective is to provide a terminal device, a communication method, and a communication system in which the time taken by connection operations/authentication operations does not increase proportionally with the pattern length, even if the transmitting side and the receiving side are not synchronized. A terminal device, a communication method, and a communication system according to the present invention create n pieces of signal information (n-bit patterns) by sequentially shifting each bit of a single piece of received signal information (n-bit pattern) one bit at a time. Through the above, signal information time-shifted by one bit each is obtained. Thus, even if the transmitting side and the receiving side are not synchronized, one of the n pieces of signal information is a signal synchronized with the transmitting side. Thereafter, the signal synchronized with the transmitting side can be detected by a brute-force calculation with the patterns (ID information) in the list.

An object is to provide a communication system, a base station, and a communication method that can avoid a state in which an RF wireless communication cannot be started due to the quality of optical wireless communication. In an optical communication system according to the present invention, a base station device repeatedly transmits an authentication information frame addressed to a terminal device at a predetermined cycle by the optical wireless communication, the frame including authentication information for connection to the terminal device by the RF wireless communication. Even if the terminal fails to acquire the authentication information at a certain timing due to the quality of optical wireless communication, the communication system has a mechanism that acquires the same authentication information at regular time intervals, so that terminal authentication processing can be performed at the time when the terminal acquires the authentication information.

Communication systems, base stations, and communication methods

In the present disclosure, a wireless base station apparatus sends out continuous light having a predetermined characteristic to a wireless terminal apparatus, and the wireless terminal apparatus selects authentication information corresponding to the predetermined characteristic, and transmits the authentication information to the wireless base station apparatus by RF wireless. When confirming that the received authentication information matches authentication information corresponding to the predetermined characteristic, the wireless base station apparatus permits information communication between the wireless terminal apparatus and an upper network.

Wireless communication system, wireless communication method and wireless terminal equipment

The present disclosure aims to enable communication to be performed with stable quality even when a user uses a terminal while moving. In the wireless communication system according to the present disclose, a switching control unitsets switching illuminance pfor maintaining illuminance of an optical signal received by a terminalat requested illuminance corresponding to throughput or higher during the time until connection switching between the communication with an optical wireless access pointand the communication with an RF wireless access pointis completed, and when the received illuminance p becomes lower than the switching illuminance pduring connection with the optical wireless access point, the switching control unitperforms connection switching from the optical wireless communication to the RF wireless communication.

Growing community of inventors

Musashino, Japan

Ryota Shiina