Patent application number | Description | Published |
20090040965 | WIRELESS COMMUNICATION DEVICE - A wireless communication device includes: an analyzing unit for analyzing an MAC header of a received frame; a storage unit for storing a source address when analyzed that the received frame is a suspension signal for suspending an occupancy of a radio channel; a determination unit for determining whether or not the source address of the received frame is stored in the storage unit when analyzed that a destination address of the received frame is for other device; and a power controlling unit for suspending a power supply to the demodulation unit and the analyzing unit for a remaining time of a period for occupying the radio channel which is described on the MAC header when determined that the source address is not stored. | 02-12-2009 |
20090086802 | WIRELESS COMMUNICATION APPARATUS - According to an aspect of the invention, there is provided a wireless communication apparatus for performing a first wireless communication with a first channel having a first bandwidth, and a second wireless communication with a second channel having a second bandwidth wider than the first bandwidth and having a frequency band covering the first channel, in accordance with CSMA/CA system by carrier sense, including: a predicting unit predicting a first time required until a transmission right for the first wireless communication is captured, and a second time required until a transmission right for the second wireless communication is captured; a judging unit judging that either one communication is recommended based upon the first and second times; and a producing unit producing, when judged that a wireless communication different from a present wireless communication is recommended, a notification frame including information indicative of the recommended wireless communication. | 04-02-2009 |
20090238132 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus includes: a communication module configured to wirelessly communicate with first and second counterpart communication apparatuses through a wireless channel during a period in which the wireless channel is allowed to be exclusively used, wherein the communication module multiplexes first and second data frames and transmits the first and second data frames to the first and second counterpart communication apparatuses, wherein the communication module completes receiving first and second receipt confirmation frames being respectively sent from the first and second counterpart communication apparatuses at first and second receipt completion timings, the second receipt completion timing being in synchronization with the first receipt completion timing, and wherein the communication module transmits a next first data frame and a next second data frame after elapse of a given time from the first receipt completion timing and the second receipt completion timing. | 09-24-2009 |
20090305734 | RADIO COMMUNICATION APPARATUS, METHOD AND PROGRAM - An apparatus includes a unit receiving a first-radio signal indicating a state in which transmission by a SDMA scheme is allowed, a unit determining whether a transmission state is a first state (the SDMA scheme is available), or a second state (the SDMA scheme is unavailable), a unit transmitting a radio signal using the SDMA scheme, when it is determined that the first state continues for the first-time period, and a unit setting a third-time period, when the first state fails to continue for the first-time period, the third-time period being obtained by subtracting, from the first-time period, a second-time period ranging from when carrier sense is started to when the transmission state is determined to be the second state, wherein when the first-radio signal is received after the third-time period is set, it is determined whether the first state continues for the third-time period. | 12-10-2009 |
20090323608 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION - A wireless communication apparatus which can simultaneously conduct communication on at least two frequency channels is described. The apparatus includes a communication unit which refers to a connection management table to determine a communication system which can be used by a wireless communication terminal using an identifier of the wireless communication terminal, and conducts communication with the wireless communication terminal on a second frequency channel using the communication system, when a request from the wireless communication terminal to change the first frequency channel to the second frequency channel is permitted. | 12-31-2009 |
20100128762 | WIRELESS COMMUNICATION APPARATUS AND TRANSMISSION CONTROL METHOD - A wireless communication apparatus includes a transmitter and a receiver, and determines a modulation and error correction coding scheme used by the transmitter. The apparatus estimates a degree of channel variation, transmits, by the transmitter, a first frame for requesting response information necessary to select the modulation and error correction coding scheme, measures a response time between a instant when the transmitter transmits the first frame and a instant when the receiver receives a second frame including the response information, determines a threshold value of the response time for determining reliability of the response information, based on the degree of channel variation, and determines the modulation and error correction coding scheme selected based on the response information included in the second frame received by the receiver in the response time shorter than the threshold value. | 05-27-2010 |
20110038262 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION APPARATUS AND PROGRAM STORAGE MEDIUM - A wireless communication system includes a first wireless communication apparatus and a second wireless communication apparatus which communicate with each other. The first wireless communication apparatus simultaneously transmits frames to the second wireless communication apparatus through first to nth (n is an integer of 2 or greater) frequency channels, the second wireless communication apparatus receives the frames from the first wireless communication apparatus through the first to nth frequency channels, judges success or failure of reception of each of the frames by performing error detection, creates delivery confirmation frame including information indicating success or failure of reception of each of the frames, and transmits the delivery confirmation frame through x specific channel (x is an integer in a range from 1 or more to n−1 or fewer) of the first to nth frequency channels to the first wireless communication apparatus a predetermined time after reception of the frames. | 02-17-2011 |
20110044302 | RADIO COMMUNICATION APPARATUS, COMPUTER READABLE STORAGE MEDIUM, AND RADIO COMMUNICATION SYSTEM - In a radio communication system that simultaneously uses plural radio channels (STA | 02-24-2011 |
20110064065 | WIRELESS COMMUNICATION APPARATUS AND METHOD - A wireless communication apparatus performs bi-directional communication with an initiator. The apparatus is allocated an allocation period for data transmission from the initiator. The apparatus includes means for generating a first physical frame including an acknowledgement frame with respect to data received from the initiator, and generating a second physical frame in which a plurality of transmission data frames addressed to the initiator are aggregated. The apparatus also includes means for transmitting the first physical frame at a first transmission rate and the second physical frame at a second transmission rate, during the allocation period. | 03-17-2011 |
20110122853 | RADIO COMMUNICATION DEVICE, CONTROL METHOD FOR RADIO COMMUNICATION DEVICE AND PROGRAM STORAGE MEDIUM - A radio communication device C | 05-26-2011 |
20130003661 | RADIO SYSTEM, RADIO BASE STATION AND RADIO TERMINAL - One of a plurality of radio terminals that transmit radio signals to a radio base station under a space multiplexing scheme, including a receiving unit | 01-03-2013 |
20130155955 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - There is provided a wireless communication apparatus performing access control which starts transmission after a backoff time passes since an available state of a channel is detected through carrier sense, the backoff time being set based on a random value selected within a contention window width, including: a remaining time calculating unit calculating a remaining time untill a request delay time time-outs after data is generated and a setting unit setting the contention window width according to the remaining time calculated by the remaining time calculating unit. | 06-20-2013 |
20130210478 | WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION APPARATUS, BOTH FOR USE IN BROADCAST WIRELESS TRANSMISSION - According to one embodiment, a wireless terminal communicates with a server via wireless base stations. The wireless terminal has devices which transmit a signal in a normal-power transmission mode and the signal in a low-power transmission mode, a power control device which switches the normal-power transmission mode to the low-power transmission mode, or vice versa, and a device which transmits current position data to the server. The server detects the position of the wireless terminal, designates one of the base stations which is close to the wireless terminal, when the wireless terminal is set to the low-power transmission mod, and detects whether the base station designated has a problem or not according to detect the signal from the wireless terminal. | 08-15-2013 |
20130294373 | RADIO SYSTEM, RADIO BASE STATION AND RADIO TERMINAL - One of a plurality of radio terminals that transmit radio signals to a radio base station under a space multiplexing scheme, including a receiving unit that receives an access right request signal with respect to the radio base station from an other radio terminal, a prevention unit that prevents transmission of radio signals when receiving radio signals directed to an other radio terminal, a cancellation unit that cancels the prevention of transmission when receiving an access right assignment signal during the prevention of transmission and a transmitting unit that transmits a data signal to the radio base station according to the assignment signal, wherein radio signals are transmitted to the radio base station simultaneously with the other radio terminals and under the space multiplexing scheme. | 11-07-2013 |
20140046497 | CONTROLLER, POWER SUPPLY UNIT, AND POWER SUPPLY SYSTEM - According to some embodiments, there is provided a controller that performs communication with a plurality of power supply units each of which outputs electric power to a load. The controller includes a receiving unit, a control information generating unit and a transmitting unit. The receiving unit receives operation information from the power supply units by radio, the operation information being information on electric power output to the load from the power supply units, respectively. The control information generating unit generates control information to control the power supply units based on the operation information. The transmitting unit transmits the control information to the power supply units by radio. | 02-13-2014 |
20140140338 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus includes: a communication module configured to wirelessly communicate with first and second counterpart communication apparatuses through a wireless channel during a period in which the wireless channel is allowed to be exclusively used, wherein the communication module multiplexes first and second data frames and transmits the first and second data frames to the first and second counterpart communication apparatuses, wherein the communication module completes receiving first and second receipt confirmation frames being respectively sent from the first and second counterpart communication apparatuses at first and second receipt completion timings, the second receipt completion timing being in synchronization with the first receipt completion timing, and wherein the communication module transmits a next first data frame and a next second data frame after elapse of a given time from the first receipt completion timing and the second receipt completion timing. | 05-22-2014 |