Abstract: According to one embodiment, a communication device wirelessly communicates with a first relay device forming a first wireless network and a second relay device forming a second wireless network. The communication device includes a first circuitry to acquire a first signal from the first relay device through wireless communication. The communication device includes a second circuitry to create, using the first signal, control information to control a terminal device existing within a coverage area of the second relay device or the second relay device and to cause the first circuitry to wirelessly transmit the control information to the terminal device or the second relay device.

Abstract: According to an embodiment, an estimation system includes a first node, a second node, and an estimator. The estimator estimates, based on a propagation time of a wave, (i) a distance from a first transmission source having transmitted the wave to the first node or (ii) a location of the first transmission source or the first node. The first node includes a wave receiver and a first wireless communicator. The wave receiver receives the wave. The first wireless communicator incorporates a first timer, synchronizes the first timer with a second timer built in the second node via wireless communication with the second node, acquires reception time information indicative of a point in time of reception of the wave from the first timer, and outputs the reception time information to the estimator.

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 an embodiment, a communication apparatus includes a timer, a synchronization processor and a signal generator. The timer updates a first timer value by counting up in synchronization with a clock signal. The synchronization processor executes a time synchronization process in order to synchronize the first timer value with a second timer value inside each of other communication apparatuses belonging to a common network. A signal generator generates a timing signal reporting arrival of a timing when content is to be controlled, based on the first timer value and content control information indicative of the timing when the content is to be controlled.

Abstract: According to one embodiment, a wireless communication apparatus includes a management unit and a setting unit. The setting unit sets, upon determination of disconnection of a wireless link with a base station of a main network used for communication, duration for waiting for receiving a first signal related to formation of a new network based on a priority. The management unit, when the duration is set, waits for receiving the first signal until the duration elapses. The setting unit switches an operation mode to a base station mode if the first signal is not received even the duration elapses. The management unit repeatedly performs a process to transmit the first signal after the operation mode is switched to the base station mode.

Abstract: According to an embodiment, a communication apparatus includes a communicator, an acquisition unit and a controller. When an operation mode is a first mode, the communicator functions as a hub of a network to communicate with another communication apparatus in the network. When the operation mode is a second mode, the communicator communicates with another communication apparatus in the network without functioning as the hub. The acquisition unit acquires communication quality information indicating a communication quality of each link in the network. When the operation mode of the communicator is the first mode, the controller decides based on the communication quality information whether to set the operation mode of the communicator to the second mode.

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, a wireless communication method for improving frequency efficiency is disclosed. The method can transmit a first instruction indicating that the second terminal is allowed to transmit a second data signal at the first frequency if the first signal strength intensity is not more than a threshold and if the second signal strength intensity is not more than a threshold. The method can transmit a second instruction indicating that the second terminal is caused to suspend the second data signal transmission at the first frequency in reference to the first instruction if interference occurring in a first base station as a transmission result of the second data signal is not less than a threshold.

Abstract: According to one embodiment, an allocating unit of a wireless communication device finds for each user an unallocated radio channel having maximum communication quality as a first radio channel, and calculates a first metric matching a communication state using communication quality in the first radio channel, selects one user from the plurality of users based on the first metric and allocates the first radio channel to the selected user. Further, the allocating unit repeats allocating an unallocated radio channel adjacent to a radio channel allocated to the selected user on a frequency domain until predetermined conditions are satisfied.

Abstract: According to certain embodiment, there is provided a control apparatus including a processor. The processor controls a first processing unit. The processor acquires determination information for estimating a time delay till execution of a first process is started, in response to receiving an interrupt request for the first process related to the first processing unit from a program being executed underway by the processor or from hardware connected via a bus to the processor, and determines whether to execute the first process or not based on the determination information.

Abstract: According to one embodiment, there is provided a power electronics device in which a controlling unit 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: There is provided a power transmitting apparatus in which the first communicating unit performs communication with a power receiving apparatus using the first antenna, the second antenna transmits the electric power generated by the power supply unit to the power receiving apparatus, the second communicating unit performs communication with the power receiving apparatus using the second antenna, the measuring unit measures first and second communication quality of the first and second communicating units, respectively, the control unit communicates, while power transmission to the power receiving apparatus is performed, transmission control information with the power receiving apparatus using the first or second communicating unit and controls the power transmission based on the transmission control information, and the control unit selects any one of the first communicating unit and the second communicating unit according to the first communication quality and the second communication quality to communicate

Abstract: A first extended base station that forms a first cell and a second extended base station that forms a second cell operate for a cooperative communication of transmitting same data to a user terminal located in the first cell. A second signal processor that corresponds to the second extended base station generates a training signal specific to the first extended base station and the first extended base station and the second extended base station transmit same data and same training signals. Thus, a cooperative communication can be realized in a system that uses a training signal specific to a base station.

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 one embodiment, a communication device communicates with N remote units. Each remote unit includes a plurality of antennas, wireless transmitting units, and wireless receiving units. The communication device is provided with a received signal processing unit, to which received signals by a plurality of the wireless receiving units are combined and input, and which specifies the remote unit subjected to interference, and a switch which decreases a reception gain of the wireless receiving unit included in N?1 remote units out of the N remote units in a predetermined measurement section. The received signal processing unit calculates a correlation value between the combined received signals and a reference signal transmitted by a user terminal connected to another base station system in the measurement section and specifies the remote unit subjected to the interference by the second user terminal based on the correlation value.

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: A wireless communication device includes a wireless communication module and an allocator. The wireless communication module wirelessly communicates with a plurality of other wireless communication devices. The allocator allocates time resources and frequency resources to a plurality of traffics which periodically occur between the wireless communication device and the plurality of other wireless communication devices in descending order of resource utilizations. The resource utilization of a given traffic corresponds to a time rate at which the given traffic uses a frequency resource allocated thereto. The allocator allocates the frequency resource, which is arranged at a position closer to an end than a center frequency, to a traffic which is the highest in resource utilization.

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 one embodiment, a wireless communication apparatus includes a management unit and a setting unit. The setting unit sets, upon determination of disconnection of a wireless link with a base station of a main network used for communication, duration for waiting for receiving a first signal related to formation of a new network based on a priority. The management unit, when the duration is set, waits for receiving the first signal until the duration elapses. The setting unit switches an operation mode to a base station mode if the first signal is not received even the duration elapses. The management unit repeatedly performs a process to transmit the first signal after the operation mode is switched to the base station mode.

Abstract: According to one embodiment, an allocating unit of a wireless communication device finds for each user an unallocated radio channel having maximum communication quality as a first radio channel, and calculates a first metric matching a communication state using communication quality in the first radio channel, selects one user from the plurality of users based on the first metric and allocates the first radio channel to the selected user. Further, the allocating unit repeats allocating an unallocated radio channel adjacent to a radio channel allocated to the selected user on a frequency domain until predetermined conditions are satisfied.