Nec Corporation

National Institute of Information and Communications Technology, Incorporated

Kenichi Maruhashi

Keiichi Ohata

Naoyuki Orihashi

Masaharu Ito

Kenichi Hosoya

Shuya Kishimoto

Satoko Itaya

Shin Nakamura

Yasuhiro Hamada

Fumihide Kojima

Yuan Luo

Kazuhiko Onda

Takashi Harada

Takao Morimoto

Masaaki Kuzuhara

Masahiro Tanomura

Shingo Takahashi

Kazuhiro Ikuina

Hidenori Shimawaki

Nobuhide Yoshida

Noriyuki Itabashi

Daisuke Inoue

Ken Tanaka

Akira Tsuji

Rie Tanaka

Toru Osuga

Takeo Onishi

Toshiya Okabe

Takeya Hashiguchi

Yumi Hirano

Taketoshi Nakajima

Shantanu Chakraborty

Fumiko Ohori

Masaharu Itou

Shuuya Kishimoto

Kouji Kobukata

Tadashi Takahama

Shuuya Yamamoto

A communication system according to the present disclosure includes: a required band calculation unit () configured to calculate a required band for a plurality of flows received by a bridge apparatus (), in which, for a flow including burst data among the plurality of flows, the required band calculation unit () calculates the required band for the flow based on a data size of the burst data and an allowable delay of the flow; and a speed ratio calculation unit () configured to calculate a relative ratio of communication speeds of the plurality of flows based on the required band for the plurality of flows. The bridge apparatus () transfers the plurality of flows to a data receiving apparatus () according to the relative ratio of the communication speeds.

Scalable data flows in a communication network

A communications network system includes a control unit, one or more wireless systems, and application equipment. The control unit acquires information about data that the application equipment communicates via the wireless systems, and acquires information about a wireless environment that has an impact on communications by the wireless systems. The control unit generates a plurality of communications policies that are delivered to the wireless systems, and manages the communications policies that are executed on the wireless systems. The wireless systems store the plurality of communications policies delivered from the control unit, and detect the status of communications, change the communications policies based on the detection result, and control information about data that the application equipment communicates via the wireless systems.

Communications network system managing communications policies based on detected state of communication environment, and communications network method

To provide a wireless communication system that can implement optimal communication conditions depending on the type of data. A wireless communication systemfor transmitting and receiving data to and from a plurality of terminalsfor use in a narrow space includes normal transmitting/receiving means for transmitting and receiving normal data, among the data, to and from a terminal, based on priorities assigned to each of a plurality of buffers stored in a base station, and urgent transmitting/receiving means for assigning a high priority to a buffer storing a lowest amount of data among the plurality of buffers, and transmitting and receiving urgent data, among the data, which is different from the normal data, to and from the terminal, via the buffer to which the high priority is assigned.

Wireless communication system and wireless communication method

A wireless communication apparatus is provided with: a first means for determining a noise generation interval on the basis of a noise measuring result; and a second means for determining the size of a data transmission unit that can be transmitted within the noise generation interval, and constructing said data transmission unit of said size.

Wireless communication apparatus, method, and storage medium having program stored therein

In the present invention, provided is a monitoring device () including an operating-state-change information acquisition unit () that acquires operating-state-change information indicating a time-series change in operating states of an electrical device, the device being capable of assuming multiple types of operating states, a standard transition pattern storage unit () that stores standard transition pattern information indicating a pattern of transition between operating states generated in a normal electrical device, and a monitoring unit () that determines whether or not the electrical device is normal using the operating-state-change information and the standard transition pattern information.

Monitoring device, monitoring system, monitoring method, and non-transitory storage medium

System and methods for performing microgrids cooperation by optimal coalition formation in a distribution network are disclosed. A Microgrid Cooperation Module (MCM) is designed for utility EMS. MCM contains a coalition formation unit and an energy exchange decision unit. Furthermore, a communication protocol for energy exchange between two microgrids is designed. The coalition formation unit applies an innovative hierarchical coalition formation algorithm to provide optimal coalition for real time operation. The real time energy status of microgrids will be provided to coalition formation unit which will determine the coalitions (given a distance threshold) among microgrids to minimize the power loss. Energy exchange decision unit then determine actual energy transfer between pairs of microgrids within a coalition. Upon receiving the energy transfer information through a communication channel, the microgrids will start communicating and process energy transfer. The optimality of the formed coalitions is ensured by performing coalitional game theoretical analysis.

Electricity distribution system with dynamic cooperative microgrids for real-time operation

This microgrid system () includes: a generator device () for outputting power; a plurality of sub-microgrids () that include utility customers () who consume power; a shared unit () connected to the plurality of sub-microgrids (), and provided with a plurality of energy storage devices () for storing power; and a control device () that, when power outputted by the generator device () is to be stored in the energy storage devices (), selects an energy storage device () as the storage destination for the power outputted by the generator device (), in accordance with the respective status of the plurality of energy storage devices (), and when power is to be supplied to utility customers (), selects an energy storage device () as the supply source for supplying power to the utility customers (), in accordance with the respective status of the plurality of energy storage devices ().

Microgrid system and control method for the same

An electric power control system of the present invention is connected to an electric power supplying means for supplying electric power and a load means for accepting supply of electric power and consuming the electric power. The electric power control system includes: a supplied energy acquiring means for acquiring a supplied energy, which is the amount of electric power supplied from the electric power supplying means; a consumed energy acquiring means for acquiring a consumed energy, which is the amount of electric power consumed by the load means; and an electric power supply and demand controlling means for, depending on a total supplied energy as the total of the acquired supplied energy and a total consumed energy as the total of the acquired consumed energy, transmitting and/or receiving electric power to and from another device to change the total supplied energy.

Electric power control system

A control device is connected to a facility appliance regulating the environment of an area and to an activity measuring instrument for each activity kind measuring the status of an activity of a person in the area. The control device has: an activity kind determination part determining an activity kind corresponding to a work performed in the area; an activity information acquisition part using the activity measuring instrument corresponding to the determined activity kind to acquire the status of the activity of the person in the area; and an environment control part causing the facility appliance to control the environment of the area on the basis of the acquired status of the activity.

Environment control system

An electric power control system of the present invention includes an electric power supplying means, a load means, and an energy storing means. The electric power control system includes: an energy storage controlling means for controlling the energy storing means so as to decrease charge or discharge electric power over a response time corresponding to a set time constant for energy storing means; and a supplied energy controlling means for executing control to change electric power supplied by the electric power supplying means over a response time corresponding to a set time constant for electric power supplying means so that the electric power supply and demand difference is kept within the preset given range. The time constant for energy storing means is set to be longer than the time constant for electric power supplying means.

A sensor system in which it is possible to identify a sufficient number of sensors even in a situation where the data length of a packet is limited, as well as a sensor and a receiving device in the same, are provided. A sensor repeating a measurement period for performing measurement and a transmission period for performing transmission at predetermined cycles, includes: a measurement section () that outputs during the measurement period measurement information based on predetermined measurement; and a transmission section () that transmits during the transmission period, by using a single packet or a plurality of packets, source identification information for identifying a source of a packet, the measurement information, and sensor-related information for identifying the sensor and/or a measurement target equipment of this sensor.

Sensor and receiving device in sensor system

[Problems to be Solved] It is an object to provide a wireless system and a control method of the wireless system capable of determining whether a beacon transmission function is accepted. [Solution] A wireless system of the present invention includes a first wireless terminal including wide area wireless communication means connecting to an external network, and first narrow area wireless communication means having a beacon transmission function for transmitting a beacon for communication control, and a second wireless terminal including second narrow area wireless communication means capable of communicating with the first narrow area wireless communication means, wherein the second wireless terminal connects to the external network via the second narrow area wireless communication means, the first narrow area wireless communication means, and the wide area wireless communication means, and when the first narrow area wireless communication means receives, from the second narrow area wireless communication means, a request signal for requesting the beacon transmission function to be transited to the second narrow area wireless communication means, the first narrow area wireless communication means transits the beacon transmission function to the second narrow area wireless communication means.

Wireless system and control method of wireless system

Provided is a storage battery device whose battery life can be prolonged further. Storage battery device having a plurality of storage battery cells connected in series includes monitoring unit that measures voltages via the terminals of the respective storage battery cells, and obtains degradation information indicating the degraded states of the plurality of storage battery cells based on the voltages, selection unit that selects at least one of the plurality of storage battery cells, power supply unit that supplies power to the storage battery cell selected by selection unit to charge the storage battery cell, and control unit that switches, based on the degradation information obtained by monitoring unit, a storage battery cell to be selected by selection unit, and adjusts the power supplied from power supply unit.

Storage battery device and charging control method

In a phased array antenna radio communication apparatus including a plurality of antennas, a radio communication apparatus is provided which can reduce an influence of the local leak signals on the radiation direction of transmission signals. Local signal phase shifters-to-are used to control phases of local signals to be input to quadrature modulators-to-, and baseband signal phase shifters-to-are used to control phases of baseband signals to be input to the quadrature modulators-to-. The radiation direction of the local leak signals to be sent from transmission antennas-to-can be controlled by the local signal phase shifters-to-, and the radiation direction of the transmission signals can be controlled by both of the local signal phase shifters-to-and the baseband signal phase shifters-to-

Radio communication apparatus, transmitter, and radio communication method

A communication device(transceivers) transmits a training signal from its own transmitting antenna while performing beam scanning, and a communication device(transceivers) receives this training signal in a state where a quasi-omni pattern is generated in its own receiving antenna. Further, the devicetransmits a training signal in a state where a quasi-omni pattern is generated in the transmitting antenna, and the devicereceives this training signal by the receiving antenna while performing beam scanning. The deviceanddetects, from respective reception results, transmitting-antenna-setting candidates of the deviceand receiving-antenna-setting candidates of the device, and determines antenna-setting pairs (combinations of antenna-setting candidates). The above-described processes are also performed for a receiving antenna of the deviceand a transmitting antenna of the device. The deviceandcommunicates by using the obtained antenna-setting pairs. In this way, when radio communication is performed by using beam forming, the time necessary for finding and setting a beam direction is reduced, thereby reducing the transmission-disconnected time.

Growing community of inventors

Tokyo, Japan

Kenichi Maruhashi