Patent application number | Description | Published |
20080287066 | RADIO COMMUNICATION APPARATUS AND METHOD - A radio communication apparatus which uses a first radio communication system that makes a radio communication by sharing frequencies with a second radio communication system, the apparatus includes a detection unit configured to detect an available frequency channel which fails to be used by the second radio communication system in a frequency band used by the first radio communication system, and a transmission unit configured to transmit, using the available frequency channel, a frame which includes a signal sequence which is used to identify whether or not the frame is transmitted by a radio communication terminal belonging to the first radio communication system by detecting the available frequency channel, the signal sequence being predetermined for the first radio communication system. | 11-20-2008 |
20090022132 | WIRELESS COMMUNICATION SYSTEM AND WIRELESS TERMINAL - A wireless communication system includes first and second wireless terminals capable of performing transmission by at least one of a first transmission scheme and a second transmission scheme. The first wireless terminal performs transmission of a first frame to the second wireless terminal by using the second transmission scheme. The second wireless terminal communicates with the first wireless terminal to notify the first wireless terminal of information associated with a status of the reception of the first frame transmitted from the first wireless terminal by using the first transmission scheme. | 01-22-2009 |
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 |
20090067345 | RADIO TERMINAL, RADIO SYSTEM, AND PROGRAM - A radio terminal managing slave terminals and forming a network together with the slave terminals, includes unit receiving, from a slave terminal, one of a secession request packet and a join request packet, first storage unit storing first identifiers of the slave terminals, second storage unit storing second identifiers to be assigned to the slave terminals and reception channels for the slave terminals, unit determining whether the reception channels assigned to the slave terminals are unevenly distributed after the slave terminal secedes from or joins the network, unit reassigning, when the determination unit determines that the reception channels are unevenly distributed, at least one of the first identifiers to at least one of the slave terminals not to unevenly distribute the reception channels and update the first storage unit, and unit transmitting the at least one of the first identifiers to the at least one of the slave terminals. | 03-12-2009 |
20100002646 | COMMUNICATION APPARATUS AND METHOD - A communication apparatus includes a receiving device configured to receive a physical frame in which a plurality of MAC frames, each having a sequence number, are aggregated. A reception buffer which stores MAC frames of the physical frame received by the receiving device. A determination device determines whether or not the first MAC frame in the physical frame received by the receiving device has been successfully received. A reception buffer management device determines, when the first MAC frame has been successfully received, a MAC frame to be forwarded to an upper layer, on the basis of the sequence number of the first MAC frame, and extracts the MAC frame from the reception buffer. | 01-07-2010 |
20100046437 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU. | 02-25-2010 |
20100046540 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU. | 02-25-2010 |
20100074277 | COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND COMMUNICATION CONTROL PROGRAM - A generation device generates a frame to be transmitted to a destination communication apparatus. The frame includes a first separation field, a first MAC protocol data unit (MPDU) following the first separation field, a second separation field following the first MPDU, a third separation field following the second separation field, and a third MPDU following the third separation field. The second separation field includes length information set to a value of zero to indicate no second MPDU directly follows the second separation field. The first MPDU includes a first MAC header, a first data field, and a first frame check sequence (FCS). The first FCS is for detecting an error occurred in at least the first data field. The third MPDU includes a third MAC header, a third data field, and a third FCS. The third FCS is for detecting an error occurred in at least the third data field. | 03-25-2010 |
20100189056 | COMMUNICATION METHOD FOR WIRELESS LANS - A physical frame is generated and transmitted to a destination terminal. In this physical frame, one of a data frame, an acknowledgement frame, and an acknowledgement request frame, and a transmission permission frame which is used in place of a normal Ack frame associated with a delayed Block Ack, and permits the destination terminal to perform piggyback transmission, are aggregated. | 07-29-2010 |
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 |
20120077534 | WIRELESS COMMUNICATION METHOD AND WIRELESS DEVICE - According to one embodiment, there is provided a wireless communication method, including: a start step of performing a connection process with a second wireless device; a communication step of performing communication for a predetermined term in a first mode; a determination step of determining, in accordance with a communication status, whether to change a communication mode from the first mode to a second mode in which communication at a higher speed than the first mode is performed, change an operating frequency channel for communication to another frequency channel than the first frequency channel, or continue the first mode; and a transmission step of transmitting a mode change signal when the determination is made to change the communication mode, and transmitting a channel change signal when the determination is made to change the operating frequency channel. | 03-29-2012 |
20130028154 | WIRELESS APPARATUS AND WIRELESS SYSTEM - One embodiment provides a wireless apparatus including: a reception unit which receives a data signal having a header field and a data field, the header field including a reply request which specifies either an acknowledgement or a negative acknowledgement; a decision unit which decides a reception result indicating whether the header field and the data field have been received successfully or unsuccessfully; and a transmission unit which transmits the acknowledgement or the negative acknowledgement in accordance with the reply request and the reception result of the data field when the header field has been received successfully, and transmits the negative acknowledgement when the header field has been received unsuccessfully. | 01-31-2013 |
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 |
20130223250 | WIRELESS COMMUNICATION APPARATUS AND INTERFERENCE DETECTION METHOD - 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. | 08-29-2013 |
20130230040 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a first processor, a second processor and a controller. The first processor generates one or more first frames and one or more second frames. The second processor transmits the first frames and the second frames, and receives a first acknowledgement and a second acknowledgement. The controller retains a first interval relating to a time interval between the first transmission request and the second transmission request and a second interval relating to a time interval between a first and a second time points, and controls transmission of frames to be transmitted based on the first and the second intervals. | 09-05-2013 |
20140079050 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a generation unit, a control unit, a transmission unit, a reception unit and an analysis unit. The control unit sets, as a first value, a magnitude of a transmission power of the first frame, and sets, as a second value smaller than the first value, a magnitude of a transmission power of the second frame. The transmission unit transmits the first frame at a first time interval until an acknowledgement frame is received, and transmits the second frame at a second time interval until an accept frame is received. The analysis unit analyzes the request transmission power information. The control unit determines a transmission power of a data frame based on the request transmission power information. | 03-20-2014 |
20140089513 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a first and a second processing unit. The first processing unit generates a control signal related to connection settings. The second processing unit supports wireless systems and is configured to transmit a first frame including first information related to at least one of the plurality of wireless systems by any of the wireless systems, grasp, based on a second frame received from another wireless communication apparatus, a wireless system supported by the other wireless communication apparatus, select a wireless system used for data exchange with the other wireless communication apparatus based on the second information indicating the grasped wireless system. | 03-27-2014 |
20140185547 | WIRELESS COMMUNICATION APPARATUS AND METHOD - In general, according to one embodiment, there is provided a wireless communication apparatus used for asymmetrical communication, in which frame transmission at a first interval and frame transmission at a second interval longer than the first interval are performed. The apparatus includes a receiver, an interval controller, and a transmitter. The receiver receives a frame for which a flag requesting transmission of an acknowledgement is set. The interval controller changes the first interval to a third interval longer than the second interval in response to reception of the frame. The transmitter performs frame transmission at the third interval. | 07-03-2014 |