Nippon Telegraph and Telephone Corporation

Shinya Tamaki

Tomohiro Taniguchi

Ryota Shiina

Kazutaka Hara

Tomoki Murakami

Toshiro Nakahira

Shunji Kimura

Yasutaka Kimura

Tetsuya Suzuki

Hirotaka Nakamura

Shin Kaneko

Tomoaki Yoshida

Tomoya Hatano

Sei Kou

Hiroshi Takahashi

Takayuki Mizuno

Takeshi Kuwahara

Tsutomu Kitoh

Mikitaka Itoh

Hiroki Iwasawa

Koji Tsuji

Kazuhiro Tokunaga

A location information transmitter transmits location information within a prescribed area. An IoT terminal receives the location information and transmits the location information and a device identifier. An address setting management device receives the location information and the device identifier and sets an IP address to be assigned to the IoT terminal on the basis of the location information and the device identifier and transmits the IP address to the IoT terminal. The IoT terminal sets the IP address received from the address setting management device for itself.

Address setting system, address setting method, address setting management device and program

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 of the present disclosure is to provide a data collection system capable of collecting various pieces of metadata other than sensing data and instrument information by existing communication protocols and associating the sensing data, the instrument information, and the metadata with each other without errors. A data collection systemis a data collection system that performs communication from a terminalto a data collection unitby one or a plurality of communication protocols, in which the terminalincludes a detection unitother than a sensor devicethat detects the sensing data and the instrument information, and stores metadata that is information detected by the detection unitin an extended field specified by the communication protocols within a frame specified by the communication protocols for transmitting the sensing data or the instrument information, and the data collection unitassociates the sensing data, the instrument information, and the metadata with each other based on information for identifying the terminaldescribed in the frame.

Data collection system and data collection method

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 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.

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

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.

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 object of the present disclosure is to provide a data collection system and a data collection method which are capable of collecting sensing data and various pieces of metadata by a single communication protocol and capable of associating the sensing data with the metadata without errors. A data collection systemof the present disclosure is a data collection system that performs communication from a terminalto a data collection unitby a standardized communication protocol (LLDP or HTIP), in which the terminalstores sensing data detected by a sensor device in an extended field different from a field in which metadata is stored, within a frame specified by the communication protocol, and the data collection unitassociates the sensing data with the metadata based on information for identifying the terminal described in the frame.

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.

A packet transfer apparatus is configured to perform packet exchange processing for exchanging multiple continuous packets with low delay while maintaining fairness between communication flows of the same priority level. The packet transfer apparatus includes: a packet classification unit; queues that holds the classified packets for each classification; and a dequeue processing unit that extracts packets from the queues. The dequeue processing unit includes a scheduling unit that controls the packet extraction amount extracted from the queue for a specific communication flow based on information on the amount of data that is requested by the communication flow and is to be continuously transmitted in packets.

Packet transfer apparatus, method, and program

A wavelength and bandwidth allocation method which includes in order a wavelength determination step Sof determining a plurality of wavelengths of an uplink signal from each ONU to OLT to guarantee a guaranteed bandwidth corresponding to a subscription service class of each ONU and a reference bandwidth distribution step Sof distributing, as reference bandwidths, all bandwidths of the plurality of wavelengths determined in the wavelength determination step Sto each ONU according to the subscription service class of each ONU and making the reference bandwidths of ONUs whose subscription service classes are the same be the same.

Wavelength and bandwidth allocation method

An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.

Optical system, and dynamic wavelength bandwidth allocation method for optical system

A discovery method, an optical communication method, and an optical communication system which can reduce an error of RTTs when an identifier is fixed after an allocated wavelength has been changed in wavelength-tunable WDM/TDM-PON and can prevent lowering of the bandwidth utilization efficiency. A table, in which a correspondence between child nodes and fixed identifiers as well as the RTTs of a frame with each of the identifiers in all combinations of allocated wavelengths are recorded, is created through a discovery process.

Discovery method, optical communication method, and optical communication system

A wavelength and bandwidth allocation method which includes in order: a wavelength allocation step of allocating each wavelength of an uplink signal to each ONU so that the sum of target bandwidths each allocated as a target to each of the ONUs to which each wavelength of the uplink signal is allocated does not exceed a bandwidth allocated to each wavelength of the uplink signal; and a bandwidth allocation step of allocating a bandwidth to each of the ONUs based on any one of a plurality of requested bandwidths accepted from each of the ONUs in each wavelength of the uplink signal so that the bandwidth actually allocated to each of the ONUs converges to the target bandwidth allocated as a target to each of the ONUs.

Growing community of inventors

Yokosuka, Japan

Shinya Tamaki