Abstract: The present disclosure relates to a wireless communication device, a wireless communication method, and a wireless communication system which perform communication between a plurality of wireless modules. The wireless communication device includes: a plurality of wireless modules; and a control circuit, in which: the wireless modules have a function of performing wireless communication, a function of monitoring a total transmission time of the wireless communication per certain observation period, and a function of limiting the wireless communication when the total transmission time reaches a certain time; and the control circuit has a function of determining a different start timing of the observation period for each wireless module.

Abstract: The fastening structure of a belt anchor comprises: the belt anchor provided at one end of a buckle of a seat belt; a floor panel; an anchor bracket joined to the floor panel; and a tank bracket to which a fuel tank is fastened and which is joined to the floor panel, wherein the belt anchor is fastened together with the floor panel, the anchor bracket, and the tank bracket.

Abstract: A base station of the embodiment includes a first wireless signal processing unit and a link management unit. The link management unit establishes a link with a first wireless terminal apparatus by using a first wireless signal processing unit. The link management unit causes the first wireless signal processing unit to radiate a wireless signal including a trigger frame in a first cycle. The link management unit, in response to a first trigger frame included in a set of the trigger frames radiated in the first cycle, receives first uplink data and information of a first queue delay time of the first uplink data from the first wireless terminal apparatus, and changes a cycle for causing the first wireless signal processing unit to radiate a wireless signal including the trigger frame from a first cycle to a second cycle shorter than the first cycle in a case where the first queue delay time exceeds the first threshold.

Abstract: A base station of the embodiment includes a first wireless signal processing unit, a second wireless signal processing unit, and a link management unit. The link management unit establishes a multilink with a wireless terminal apparatus by using the first wireless signal processing unit and the second wireless signal processing unit. The link management unit generates a trigger frame for causing the wireless terminal apparatus to transmit uplink data, and causes each of the first wireless signal processing unit and the second wireless signal processing unit to transmit the trigger frame.

Abstract: The fastening structure of a belt anchor comprises: the belt anchor provided at one end of a buckle of a seat belt; a floor panel; an anchor bracket joined to the floor panel; and a tank bracket to which a fuel tank is fastened and which is joined to the floor panel, wherein the belt anchor is fastened together with the floor panel, the anchor bracket, and the tank bracket.

Abstract: A wireless apparatus according to one aspect of the present invention includes an acquisition unit configured to acquire a communication quality index indicating communication quality of a link for each of a plurality of links forming a multi-link with another wireless apparatus; and a multi-link control unit configured to determine whether to suspend use of a first link having the lowest communication quality among the plurality of links based on comparison between the communication quality index for the first link and a first threshold.

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

Abstract: A wireless communication system includes: a plurality of wireless communication apparatuses that constitutes a wireless communication network; and one or a plurality of control apparatuses that controls the plurality of wireless communication apparatuses. Each of the plurality of wireless communication apparatuses includes a plurality of network interface controllers (NICs) that performs wireless communication through different channels that do not overlap each other. The one or plurality of control apparatuses executes channel switching processing of switching a use state of the plurality of NICs in each of the plurality of wireless communication apparatuses. The one or plurality of control apparatuses controls the plurality of wireless communication apparatuses to use NICs of the same channel in the same period.

Abstract: A wireless communication system includes: a first wireless terminal capable of communicating through both a first communication scheme using a first frequency band and a second communication scheme using a second frequency band higher than the first frequency band; a second wireless terminal that is compatible with communication through the first communication scheme and is not compatible with communication through the second communication scheme; and a base station that is compatible with multi-link and accommodating the first wireless terminal and the second wireless terminal. A carrier sense level during transmission in communication between a base station and the first wireless terminal through the first communication scheme is set to a value less than a predetermined value that is a carrier sense level during transmission in communication between the base station and the second wireless terminal through the first communication scheme.

Abstract: A frequency state observation system observes a spectrum in a predetermined frequency range by a plurality of observation devices that are arranged in advance at different positions in a predetermined area, performs wireless communication in the predetermined frequency range, receives, by a data calculation device, the spectrum and packet information from each of the plurality of observation devices together with each of time information, synchronizes each of spectra received by the data calculation device based on time information of packet information corresponding to the spectra, and determines usage of a frequency in the predetermined area or the type of a wireless system transmitting a radio wave in the predetermined area, on the basis of each of the synchronized spectra.

Abstract: A wireless communication system according to one embodiment is a wireless communication system including: one or more wireless terminals capable of communicating by both a first communication scheme using a first frequency band and a second communication scheme using a second frequency band, which is higher than the first frequency band; and a multi-device compatible base station that accommodates the wireless terminals, and the wireless communication system includes: delay determination circuitry configured to determine whether a delay in communication of the second communication scheme exceeds a predetermined value; and a controller to perform control such that the wireless terminals and the base station communicate by the first communication scheme without using the second communication scheme until a predetermined time elapses in a case where the delay determination circuitry determine that the delay exceeds the predetermined value.

Abstract: A terminal apparatus includes a determination unit and a transmission unit. The determination unit determines a target of transmission power regulation based on a beacon frame. The transmission unit, in a case where it is determined that the target of regulation is not a transmission power density, transmits a first frame in a first frequency band, and in a case where it is determined that the target of regulation is a transmission power density, transmits a second frame which is a duplicate of the first frame in a second frequency band while transmitting the first frame in the first frequency band.

Abstract: A wireless communication system includes a multi-device-compatible base station to mixedly accommodate one or more first wireless terminals capable of performing simultaneous communication by a plurality of different communication schemes. There is a control device configured to control the base station. The control device includes a collection unit that collects scheme information regarding the communication schemes by which the first wireless terminals are able to perform communication and scheme information regarding the communication schemes by which the second wireless terminals are able to perform communication. There is also a distribution control unit that controls distribution of traffic.

Abstract: The wireless communication system includes a plurality of wireless terminals each including a plurality of wireless interfaces corresponding to a plurality of channels in different frequency bands, and a wireless base station device that establishes wireless communication with the wireless terminals. Each of the wireless terminals performs channel sensing, and transmits sensing information including an identifier of a sensed channel, a sensing result of the channel, and an identifier of the wireless terminal. The wireless base station device calculates and stores a sensing time for each of the wireless terminals on the basis of the sensing information, the sensing time being an accumulated value of time required for sensing by the wireless terminal, and allocates a reward according to the sensing time to each of the plurality of wireless terminals.

Abstract: A wireless communication system includes: a first wireless terminal capable of communicating through both a first communication scheme using a first frequency band and a second communication scheme using a second frequency band higher than the first frequency band; a second wireless terminal that is compatible with communication through the first communication scheme and is not compatible with communication through the second communication scheme; and a multi-link compatible base station that accommodates the first wireless terminal and the second wireless terminal. A contention window value during transmission in communication between the base station and the first wireless terminal through the first communication scheme is set to a value greater than a predetermined value that is a contention window value during transmission in communication between the base station and the second wireless terminal through the first communication scheme.

Abstract: A wireless communication system according to one embodiment is a wireless communication system including: one or more wireless terminals capable of communicating by both a first communication scheme using a first frequency band and a second communication scheme using a second frequency band, which is higher than the first frequency band; and a multi-device compatible base station that accommodates the wireless terminals, and the wireless communication system includes: number-of-times measurement circuitry configured to measure the number of retries for attempting communication by the second communication scheme; and a controller to perform control such that the base station performs wireless communication by the first communication scheme without using the second communication scheme until a predetermined time elapses with respect to a wireless terminal in which the number of times measured by the number-of-times measurement circuitry exceed a predetermined number of times.

Abstract: The wireless communication system includes a plurality of wireless terminals each including a plurality of wireless interfaces corresponding to a plurality of channels in different frequency bands, and a wireless base station device that establishes wireless communication with the wireless terminals. Each of the wireless terminals performs channel sensing, and transmits sensing information including an identifier of a sensed channel, a sensing result of the channel, and an identifier of the wireless terminal. The wireless base station device calculates and stores the number of sensing channels for each of the wireless terminals on the basis of the sensing information, the number of sensing channels being the number of channels sensed by the wireless terminal, and allocates a reward according to the number of sensing channels to each of the plurality of wireless terminals.

Abstract: A frequency state observation system according to an embodiment includes a spectrum observation device that observes a spectrum of a frequency range that can be used by a plurality of wireless communication systems, a control device that controls the spectrum observation device to perform a plurality of single sweeps over the frequency range, and a wireless communication device that transmits, by a radio signal, information indicating a frequency of occurrence of a signal having a predetermined threshold or more included in a spectrum observed by the spectrum observation device performing a plurality of single sweeps, with respect to a predetermined time.

Abstract: The wireless communication system includes a wireless terminal and a control unit. The wireless terminal includes a plurality of wireless modules that respectively perform wireless communication with a plurality of base stations on different channels. The wireless terminal uses one of the plurality of wireless modules as a use module, and stops data transmission from wireless modules other than the use module. The control unit performs switching of the use module in the wireless terminal such that a transmission time rate of each of the plurality of wireless modules does not exceed a predetermined upper limit.

Abstract: A wireless apparatus according to an aspect of the present invention includes a threshold determination unit that determines a threshold used for determining a usage state of a frequency channel, the threshold determination unit setting the threshold to a first value when a first priority that is a priority of a frame to be transmitted is a first priority level and setting the threshold to a second value higher than the first value when the first priority is a second priority level higher than the first priority level, and a carrier sense control unit that determines the usage state of the frequency channel based on a comparison between reception power of a frame detected on the frequency channel by carrier sense and the threshold.