Abstract: According to one embodiment, an electronic apparatus communicable with a measurement apparatus includes a power supplier and control circuitry. The power supplier is configured to supply power by an electromagnetic wave. The control circuitry is configured to receive first information on a wireless signal measured by the measurement apparatus and control the electromagnetic wave for power supply based on both the first information and a position of the measurement apparatus.

Abstract: According to one embodiment, a wireless device includes: a receiver configured to receive a first frame and a second frame; and processing circuitry. The processing circuitry is configured to determine, when a reception level of the first frame is a first threshold or more, whether a transmission source of the first frame belongs to a same wireless network as the wireless device, determine, when the transmission source of the first frame belongs to the same wireless network as the wireless device, a second threshold based on a reception level of the first frame, and perform, when a reception level of the second frame is a second threshold or more, reception processing of the second frame.

Abstract: A wireless communication device includes a receiver configured to receive first information to designate a first bandwidth narrower than a maximum available bandwidth extended based on a predetermined channel, and to receive second information to designate a plurality of channels including at least one channel different from a channel in the first bandwidth among a plurality of channels in the maximum bandwidth; and controlling circuitry configured to specify a plurality of channels for use in communication based on at least the second information.

Abstract: An electronic apparatus includes processing circuitry configured to select a first interval to be used for an access to a medium when a first condition is satisfied. The first interval has a fixed length shorter than DIFS (distribute coordination function inter frame space) defined in IEEE802.11 standard. The processing circuitry is also configured to select a second interval to be used for the access to the medium when a second condition different from the first condition is satisfied. The second interval has a fixed length equal to or longer than the DIFS defined in the IEEE802.11 standard. The electronic apparatus also includes wireless circuitry configured to access the medium to transmit a radio wave conforming to a first wireless specification different from the IEEE802.11 standard after the medium is idle for the selected first or second interval.

Abstract: According to one embodiment, a wireless communication device includes controlling circuitry configured to adjust a directivity of each of a plurality antennas based on a received power of a first frame for each of the plurality of antennas; and a transmitter configured to transmit a second frame for responding to the first frame after the directivity is adjusted.

Abstract: A wireless communication apparatus includes a transmission and reception processing unit which communicates using a first communication scheme, by using either a first inter frame spaces of a first type or the second inter frame spaces of the first type, wherein the second inter frame spaces is larger than the first inter frame spaces, the second inter frame spaces is determined based on an inter frame space used in a second communication scheme.

Abstract: A wireless communication device includes a receiver configured to receive first information to designate a first bandwidth narrower than a maximum available bandwidth extended based on a predetermined channel, and to receive second information to designate a plurality of channels including at least one channel different from a channel in the first bandwidth among a plurality of channels in the maximum bandwidth; and controlling circuitry configured to specify a plurality of channels for use in communication based on at least the second information.

Abstract: According to one embodiment, a wireless communication device includes controlling circuitry configured to adjust a directivity of each of a plurality antennas based on a received power of a first frame for each of the plurality of antennas; and a transmitter configured to transmit a second frame for responding to the first frame after the directivity is adjusted.

Abstract: According to one embodiment, a wireless communication device includes: controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and to determine, when a first frame addressed to another device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs.

Abstract: According to one embodiment, a wireless communication device includes a first receiver; a second transmitter; a controller; and a pre-equalizer. The controller switches a reception frequency of the first receiver from a first frequency to a second frequency and a transmission frequency of the first transmitter from the second frequency to the first frequency, at a first timing. The pre-equalizer pre-equalizes a second signal, based on channel state information of a first signal received in the first receiver before the first timing. The first transmitter transmits the pre-equalized second signal, after the first timing.

Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.

Abstract: According to one embodiment, a wireless communication device includes: controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and to determine, when a first frame addressed to another device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs.

Abstract: A wireless communication device according to an aspect of the present invention includes a transmitter, a receiver, and a signal processor. The transmitter transmits a first signal. The receiver receives a second signal which includes information indicating a transmission channel characteristic at the time of transmission of the first signal. The signal processor acquires the transmission channel characteristic at the time of transmission of the first signal from the second signal, estimates a reception channel characteristic at the time of reception of the second signal from the second signal, and estimates a transmission channel characteristic at a time later than a time associated with the acquired transmission channel characteristic on the basis of the acquired transmission channel characteristic and the estimated reception channel characteristic. The transmitter transmits a third signal on the basis of the estimated transmission channel characteristic.

Abstract: A wireless communication device according to an aspect of the present invention includes a transmitter, a receiver, and a signal processor. The transmitter transmits a first OFDM signal. The receiver receives a second OFDM signal. The signal processor detects a first timing that is a symbol timing for the first OFDM signal, detects a second timing that is a symbol timing for the second OFDM signal, determines a setup value for a symbol length of a new first OFDM signal on the basis of the first timing and the second timing, and generates the new first OFDM signal, the symbol length of which is adjusted to the setup value.

Abstract: According to one embodiment, an antenna arrangement determination device includes a candidate value generator, a calculator and an antenna arrangement determiner. The candidate value generator generates candidate values of a distance between a plurality of antennas, at an interval according to an installation height of an arbitrary one of the antennas, the distance between the antennas being adjustable. The calculator calculates communication quality in a case of setting the distance between the antennas at the candidate values. The antenna arrangement determiner determines a setting value of the distance between the antennas from the candidate values based on the communication quality.

Abstract: According to one embodiment, a wireless communication device includes: a first transmitter configured to transmit a first frame to instruct transmission prohibition to a first wireless communication device, and to transmit a signal to a second wireless communication device during a period in which the transmission is prohibited; and a first receiver configured to receive power reception amount information corresponding to the signal after the signal is transmitted.

Abstract: According to one embodiment, a wireless communication apparatus is provided with first and second determination units. The first unit determines based on a first carrier sense threshold whether busy state or not and specifies a first time when busy state is determined with the first threshold, and determines based on a second carrier sense threshold smaller than the first threshold whether busy state or not and specifies a second time when busy state is determined. The second unit determines, if at least busy state is determined based on the second threshold and the second time precedes a reference time equal to or earlier than the first time, to perform processing for avoiding interference.

Abstract: According to one embodiment, a wireless communication device includes a receiver, a controller and a transmitter. The receiver receives a terminal identifier of a first terminal being a target for downlink frequency multiplexing transmission from another wireless communication device, and receives information identifying, of a plurality of frequency components, a first frequency component allocated to the first terminal. The controller selects, of a plurality second terminals belonging to the wireless communication device, a second terminal having a terminal identifier same as that of the first terminal and allocates the first frequency component to the selected second terminal.

Abstract: According to an embodiment, a communication device is provided in a movable body and is wirelessly communicable with a transceiver unit and another movable body. A receiver of the device receives transceiver unit information including traffic-light information that the transceiver unit has transmitted to a predetermined channel. An processing circuitry extracts the traffic-light information corresponding to a running direction of the movable body from the transceiver unit information. A transmitter transmits movable body information of the movable body to the predetermined channel. A processing circuitry controls a transmission timing of the movable body information such that a transmission control period becomes a preset first time. A processing circuitry changes the transmission control period to a second time longer than the first time, when the traffic-light information with respect to the running direction indicates a stopping command, and a speed of the movable body is a preset speed or less.

Abstract: A wireless communication terminal including a transmitter which transmits, to an external device, a frame including n frame sets each including a subheader field, a frame check sequence field, and a frame body field including data, where n is an integer of two or more. The subheader field includes a sequence number field which notifies a sequence number; a more fragment field which notifies whether or not the data is a last fragment; and a frame body length field which notifies a length of the frame body field. A receiver receives, from the external device, a response frame notifying a successively and successfully received maximum sequence number which indicates a highest sequence number among sequence numbers indicated in sequence number fields of frame sets which have been successively and successfully received by the external device among the n frame sets included in the transmitted frame.