Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.

Abstract: In a first subframe determined from a first number of hops up to a concentrator and being among a plurality of subframes included in a first frame period, a first wireless communication apparatus transmits first data, a second wireless communication apparatus transmits second data, and a third wireless communication apparatus receives the second data. In a second subframe determined from a second number of hops different from the first number of hops up to the concentrator and not corresponding to the first subframe among a plurality of subframes included in a second frame period following after the first frame period, the third wireless communication apparatus transmits the second data, and the third wireless communication apparatus does not transmit the second data in the first frame period.

Abstract: A wireless communication device according to an embodiment is one of a plurality of wireless communication devices in a multihop wireless communication system to transmit and receive information with each other. The wireless communication device has: a transmitter configured to transmit information in an m-th slot (m is an integer equal to or more than 1 and equal to or less than M, M is an integer equal to or more than 2) in a first slot group in N slot groups (N is an integer equal to or more than 2) in a frame, respective one of the slot groups including M slots, and a controller configured to control the transmitter to receive a connection request in an m-th slot in a second slot group in the N slot groups from a wireless communication device not included in the plurality of wireless communication devices.

Abstract: According to one embodiment of the present invention, there is provided a communication device includes: processing circuitry configured to generate first bitmap data indicating a calculated value of a function based on identifiers of other first communication devices; and a communicator configured to transmit a first message including the first bitmap data.

Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.

Abstract: A wireless communication system includes a concentrator and a plurality of wireless communication apparatuses including a first wireless communication apparatus having a first number of hops up to the concentrator, a second wireless communication apparatus having a second number of hops different from the first number of hops up to the concentrator, and a third wireless communication apparatus having a third number of hops different from the first number of hops and the second number of hops up to the concentrator. In a first subframe among a plurality of subframes included in a first frame period, the first wireless communication apparatus transmits first data, the second wireless communication apparatus transmits second data, and the third wireless communication apparatus receives the second data.

Abstract: According to one embodiment of the present invention, there is provided a communication device includes: processing circuitry configured to generate first bitmap data indicating a calculated value of a function based on identifiers of other first communication devices; and a communicator configured to transmit a first message including the first bitmap data.

Abstract: A wireless communication device for wireless relay communication includes a network interface, a data storage, and a processor. The processor determines whether or not to continue communication with a current parent node based on a communication status with the current parent node. Upon determining not to continue communication with the current parent node, the processor determines part of the nodes in the network to be one or more candidates for a new parent node, based on hop numbers of the nodes stored in the data storage, each of which is associated with one of the nodes in the network, wherein a hop number of a node indicates a node distance between the node and a reference node, causes the network interface to be in a receivable state during time slots associated with the one or more candidates, and selects one of the candidates as the new parent node.

Abstract: According to one embodiment, there is provided a power electronics device in which a selects a first power electronics device and a second power electronics device from power electronics devices, based on power attribute information and communication attribute information of each power electronics device, and the first power electronics device is a master of power allocation control of electric energy that the power electronics devices connected to one power line of power lines perform input and output on the one power line, and the second power electronics device is a master of output power phase synchronization control of power which the power electronics devices connected to the one power line outputs to the one power line.

Abstract: A wireless communication device for wireless relay communication includes a network interface, a data storage, and a processor. The processor determines whether or not to continue communication with a current parent node based on a communication status with the current parent node. Upon determining not to continue communication with the current parent node, the processor determines part of the nodes in the network to be one or more candidates for a new parent node, based on hop numbers of the nodes stored in the data storage, each of which is associated with one of the nodes in the network, wherein a hop number of a node indicates a node distance between the node and a reference node, causes the network interface to be in a receivable state during time slots associated with the one or more candidates, and selects one of the candidates as the new parent node.

Abstract: A wireless communication device according to an embodiment has an interface and a sleep controller. The interface transmits and receives a wireless signal. The sleep controller sets a sleep period equal to or shorter than a predetermined interrupt period when a first period from a current time to a start timing of a next one of the task is longer than the interrupt period.

Abstract: A wireless communication device according to an embodiment is one of a plurality of wireless communication devices in a multihop wireless communication system to transmit and receive information with each other. The wireless communication device has: a transmitter configured to transmit information in an m-th slot (m is an integer equal to or more than 1 and equal to or less than M, M is an integer equal to or more than 2) in a first slot group in N slot groups (N is an integer equal to or more than 2) in a frame, respective one of the slot groups including M slots, and a controller configured to control the transmitter to receive a connection request in an m-th slot in a second slot group in the N slot groups from a wireless communication device not included in the plurality of wireless communication devices.

Abstract: A wireless communication device according to one of the embodiments has: a transmitter configured to transmit information; and a controller configured to control the transmitter. The controller calculates a communication amount for additional communication with another device on the basis of power information indicating a power state of a power supply; and determines whether the wireless communication device connect to the another device at least in part based on the calculated communication amount.

Abstract: According to an embodiment, a wireless communication unit includes a media access control (MAC) unit. The MAC unit includes a clock unit, an acquisition unit and a calculation unit. The clock unit includes a register which stores periodically counted-up first time information. The acquisition unit acquires a statistic for reception quality information on the received packet. The calculation unit normalizes the second time information, weights the normalized second time information using a time weight based on the statistic, and calculates a time correction value for correcting the first time information, using the weighted and normalized second time information. The time weight increases with increasing link stability indicated by the statistic.

Abstract: According to an embodiment, a control device is connected to a network including sensor terminals having wireless communication function. The control device includes a collecting unit, a calculating unit, a deciding unit, and a communication control unit. The collecting unit collects, from the sensor terminals, electrical power data containing, from among amount of stored electricity and electric-generating capacity of the sensor terminal, at least the amount of stored electricity and containing relationship information of a communicable sensor terminal. The calculating unit generates, based on the relationship information, relay path candidates for communication data and calculates, for the relay path candidates, power consumption of the sensor terminal. The deciding unit decides on a relay path for communication among the sensor terminals based on the calculated power consumption and the collected electrical power data.

Abstract: A positioning target terminal according to an embodiment includes a wireless communicator and a positioning calculator. The wireless communicator has a connection function and time synchronization function with the positioning node, and acts as a master of time synchronization. The positioning calculator performs a positioning calculation based on a reception time of a sound wave transmitted from the positioning node or a reception time of a sound wave received by the positioning node.

Abstract: According to an embodiment, a wireless communication apparatus includes a packet generator, a queue unit, a predictor and a scheduler. The packet generator packetizes data. The queue unit temporarily stores a packet to be transmitted. The predictor predicts a transmission time of a first packet to obtain a first time. The scheduler outputs a second packet to the queue unit at a second time earlier than the first time. An interval from a third time when transmission of the second packet is complete until the first time is equal to or shorter than a predetermined period.

Abstract: According to one embodiment, a phase estimating device includes a periodic signal obtaining unit that obtains a first periodic signal, and a wireless time synchronizing unit that synchronizes a reference time with that of a signal generating device by wirelessly communicating with the signal generating device that outputs a second periodic signal according to phase information. The phase estimating device includes a reference time storing unit that stores the reference time synchronized with that of the signal generating device by the wireless time synchronizing unit. The phase estimating device includes a phase determining unit that obtains sampled times from the reference time storing unit at timing at which the first periodic signal rises above or falls below a predetermined level, and determines phase information on a phase of the first periodic signal based on the obtained sampled time and period information on a period of the first periodic signal.

Abstract: According to one embodiment, an inverter apparatus includes a power conversion unit, a wireless communication unit and a control unit. The power conversion unit converts input power that is one of DC power and AC power into AC output power. The wireless communication unit wirelessly receives a first synchronization signal. The control unit controls a phase of the output power based on the first synchronization signal.

Abstract: According to an embodiment, a signal detection apparatus includes an allocator, a generator and a limiter. The allocator allocates priority levels to signal characteristics of the signal block. The generator generates feature information representing a feature of a time domain of the signal block for each of signal characteristics. The limiter, if a total information volume of the pieces of feature information exceeds an upper limit information volume corresponding to the bandwidth, selects some of the pieces of feature information based on the priority levels allocated to the pieces of feature information to limit an information volume of the selected pieces of feature information not to exceed the upper limit information volume.