Patent application number | Description | Published |
20090196364 | RADIO COMMUNICATION DEVICE, RADIO COMMUNICATION METHOD, AND PROGRAM - 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. | 08-06-2009 |
20100226349 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - A wireless communication apparatus has a transmission unit that transmits a transmit signal in a condition where either acknowledgement or negative acknowledgement is set therein, a reception unit that receives a response signal in response to the transmission signal, a counter that counts the number of times the reception unit has not received the negative acknowledgment signal in response to the transmission signal in which the negative acknowledgement is set, and a control unit that causes the transmission unit to set the negative acknowledgement if a count value of the counter is less than a predetermined value and, if the count value is equal to or larger than the predetermined value, causes the transmission unit to set the acknowledgement. | 09-09-2010 |
20110044257 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION APPARATUS CONTROL METHOD AND COMPUTER READABLE STORAGE MEDIUM - By using multiple channels at the same time to realize broadbanding of the frequency channels and suppressing increase in the waiting time before starting transmission of wireless signals, improvement of the practical throughput can be realized. A wireless communication apparatus API is a wireless communication apparatus provided with a space division processing unit | 02-24-2011 |
20110243022 | WIRELESS COMMUNICATION APPARATUS - According to one embodiment, a wireless communication apparatus includes a reception unit configured to obtain a reception signal by receiving a first packet having, as a unit, a slot including at least two repetitive symbol sequences used to transmit an identical symbol by switching antenna beams having different directions, a carrier sensing unit configured to sense a carrier for each symbol period from the reception signal, a measurement unit configured to measure a slot length from the reception signal, a generation unit configured to generate a second packet having the slot as a unit, a timer which decrements a time period until transmission of the second packet for each slot length, a control unit configured to stop, if a carrier is sensed within a time period of the slot length, the timer for the time period, a transmission unit configured to transmit the second packet according to the timer. | 10-06-2011 |
20120100816 | COMMUNICATION APPARATUS - According to one exemplary embodiment, a communication apparatus includes: a measurement module which measures reception power of each field; a determination module which determines whether the reception power is within a range; a calculator which calculates a gain using the reception power if the reception power is not within the range; an adjuster which adjusts a field according to one of an initial gain and the calculated gain; a selector which selects a field length according to the number of field adjustments by the adjuster; and a transmitter which transmits information regarding the field length. When the number of the adjustments is lower than a first threshold value, the selector selects a first value, and when the number of the adjustments is equal to or higher than the first threshold value, the selector selects a second value that is higher than the first value, as the field length. | 04-26-2012 |
20120110405 | COMMUNICATION DEVICE - According to one exemplary embodiment, a communication device includes: a receiver which receives a frame including data, a first error detection code for detecting an error of the data, a sequence number of the data, and a second error detection code for detecting an error of the sequence number; a first detector which detects the error of the data using the first error detection code; a second detector which detects the error of the sequence number using the second error detection code; a generator which generates an acknowledgement frame having maximum sequence number information regarding a maximum sequence number in a frame for which the error of the sequence number is not detected, and acknowledgement information representing whether there is an error for data in each frame of which the sequence number being equal to or less than the maximum sequence number; and a transmitter which transmits the acknowledgement frame. | 05-03-2012 |
20120127904 | WIRELESS RECEIVING APPARATUS AND TRANSMITTING APPARATUS - According to one embodiment, a wireless receiving apparatus includes a receiving unit, a buffer, a prediction unit, a sleep control unit, an access control unit, a generation unit and a transmitting unit. The receiving unit is configured to receive data to extract a payload data. The buffer is configured to generate a buffer-full signal if a payload data size is larger than a free area size. The prediction unit is configured to generate predicted latency. The sleep control unit is configured to generate sleep information based on the predicted latency. The access control unit is configured to generate a sleep-frame parameter including the sleep information. The generation unit is configured to generate a sleep-frame. The transmitting unit is configured to transmit the sleep-frame. The sleep control unit keeps the power supply in the sleep state for indicating the sleep information after receiving an acknowledgment of receiving of the sleep-frame. | 05-24-2012 |
20120129463 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes following units. The first timer measures first time intervals. The second timer measures second time intervals. The time interval selection unit selects a second time interval among second time intervals included in each first time interval. The control unit controls the transmitting unit and the receiving unit to operate, during the selected second time interval, in a first operational state in which a transmission of a connection request signal and a wait for reception of a response signal are repeatedly performed, and to operate, during each of the second time intervals other than the selected second time interval, in a second operational state in which a wait for reception of a connection request signal transmitted by another apparatus is performed for a third time interval shorter than each of the second time intervals. | 05-24-2012 |
20120129470 | WIRELESS COMMUNICATION APPARATUS - According to one embodiment, a wireless communication apparatus includes a first timer, a generation unit, a transmitter, a receiver and a control unit. The first timer is configured to periodically measure a first time interval. The generation unit is configured to generate a connection request frame. The transmitter is configured to transmit the connection request frame. The receiver is configured to receive a response signal provided in response to the connection request frame. The control unit is configured to control the transmitter and the receiver in such a manner that iterative attempts are made to carry out a transmission of the connection request frame and a wait for reception of the response signal during the first time interval measured by the first timer. | 05-24-2012 |
20120129471 | WIRELESS COMMUNICATION APPARATUS - According to one embodiment, a wireless communication apparatus includes a wireless unit and a control unit. The wireless unit is configured to set, for each period, a transmit state including a first period for transmitting a connection request to establish connection or a receive state including a second period for receiving a connection request and to transmit or receive a signal, both lengths of the first period and the second period being equal. The control unit is configured to control the wireless unit to operate in one of a transmit mode, a receive mode and a transceive mode. The control unit causes the wireless unit to operate in the receive mode or the transceive mode before a trigger signal is externally input, and to operate in the transmit mode if the trigger signal is input. | 05-24-2012 |
20120163226 | COMMUNICATION SYSTEM - According to one embodiment, a communication device includes a first wireless device configured to transmit a signal and a second wireless device configured to transmit a positive acknowledge when reception of the signal is successful. In the first wireless device, a first controller controls a first transmission module to change a first frequency channel based on a change order stored in a first storage when the positive acknowledge is not received even after the time measured by a first timer exceeds a first period. In the second wireless device, a second controller controls a second reception module to change the first frequency channel based on the change order stored in a second storage when the positive acknowledge is not transmitted even after the time measured by a second timer exceeds the first period. | 06-28-2012 |
20120170568 | WIRELESS SYSTEM - In a wireless system of one embodiment, a first wireless device includes: a first transmitter which transmits an end-of-transmission notification; and a first receiver which receives a change request signal sent from a second wireless device receiving the end-of-transmission notification. The second wireless device includes: a second receiver which receives the end-of-transmission notification; and a second transmitter which transmits a change request signal when the end-of-transmission notification is received. The first transmitter transmits a signal at a longer interval after the first receiver receives the change request signal, and the second transmitter transmits a signal at a shorter interval after the second transmitter transmits the change request signal. | 07-05-2012 |
20120195296 | WIRELESS COMMUNICATION APPARATUS - According to embodiments, a wireless communication apparatus supports at least a second wireless communication scheme between a first, wireless communication scheme and the second wireless communication scheme. The first wireless communication scheme requires that a wireless medium is determined to be busy when a reception level is equal to or greater than a minimum reception sensitivity level of physical scheme. The apparatus includes a first processing unit and a second processing unit. The first processing unit is configured to set a value lower than a maximum transmission power of the first wireless communication scheme, for a maximum transmission power of the second wireless communication scheme and set a value greater than the minimum reception sensitivity level, of the physical scheme, for a carrier sense level, when the second wireless communication scheme is used. The second processing unit is configured to carry out carrier sense using the carrier sense level. | 08-02-2012 |
20120201177 | WIRELESS COMMUNICATION TERMINAL - According to one embodiment, a wireless communication terminal including a receiver, a first processor, a first storage, a second storage, a second processor, and a transmitter is provided. The receiver receives one physical packet that includes at least one frame body field, a first field including information on a length of the frame body field, a second field used to detect an error of the frame body field, and a sequence number field including a sequence number corresponding to the frame body field. The second storage retains a successively and successfully received maximum sequence number on the basis of a result of the first processor. The transmitter transmits a response frame indicating the successively and successfully received maximum sequence number when the first processor extracts at least one correct frame body. | 08-09-2012 |
20120218938 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a receiving unit, a transmitting unit and a control unit. The receiving unit is configured to receive a first connection request frame indicating a connection request from another apparatus. The transmitting unit is configured to transmit a connection acceptance frame indicating a response to the first connection request frame. The control unit is configured to control the transmitting unit to retransmit the connection acceptance frame until a first acknowledgement frame addressed to the apparatus as a response to the connection acceptance frame is received from the another apparatus, and control the transmitting unit to stop from transmitting the connection acceptance frame if a second acknowledgement frame addressed to the another apparatus as a destination is received or if a second connection request frame addressed to the another apparatus is received. | 08-30-2012 |
20120220228 | WIRELESS COMMUNICATION APPARATUS - According to one embodiment, there is provided a wireless communication apparatus for making wireless connection in the first connection attempt state wherein a connection request is attempted using a predetermined frequency channel or the second connection attempt state wherein a connection request is attempted using a plurality of frequency channels. A frame generation unit generates a connection request frame which includes the first field for requesting a search of the plurality of frequency channels in response to occurrence of interference, and the second field indicating whether a corresponding frequency channel is a channel wherein occurrence of interference has been detected. A transmission unit transmits the connection request frame using the predetermined frequency channel in the first connection attempt state, and transmits the connection request frame using the plurality of frequency channels in the second connection attempt state. | 08-30-2012 |
20130210367 | RADIO APPARATUS - According to one embodiment, a radio apparatus includes: a radio unit; a timer configured to count a first measurement time; a control unit configured to establish a first mode if the first measurement time is shorter than a first time, and establish a second mode if the first measurement time is longer than or equal to the first time; and a power control unit configured to control power to be supplied to the radio unit if the first mode is set and next data is not received even if a second time elapsed, and control power to be supplied to the radio unit if the second mode is set and next data is not received even if a third time elapsed, wherein the radio unit makes a transition to a sleep mode as a result of a power control by the power control unit. | 08-15-2013 |
20140161040 | WIRELESS COMMUNICATION TERMINAL - According to one embodiment, a wireless communication terminal including a receiver, a first processor, a first storage, a second storage, a second processor, and a transmitter is provided. The receiver receives one physical packet that includes at least one frame body field, a first field including information on a length of the frame body field, a second field used to detect an error of the frame body field, and a sequence number field including a sequence number corresponding to the frame body field. The second storage retains a successively and successfully received maximum sequence number on the basis of a result of the first processor. The transmitter transmits a response frame indicating the successively and successfully received maximum sequence number when the first processor extracts at least one correct frame body. | 06-12-2014 |
20140269586 | WIRELESS SYSTEM - In a wireless system of one embodiment, a first wireless device includes a first transmitter which transmits an end-of-transmission notification, and a first receiver which receives a change request signal sent from a second wireless device receiving the end-of-transmission notification. The second wireless device includes a second receiver which receives the end-of-transmission notification, and a second transmitter which transmits a change request signal when the end-of-transmission notification is received. The first transmitter transmits a signal at a longer interval after the first receiver receives the change request signal, and the second transmitter transmits a signal at a shorter interval after the second transmitter transmits the change request signal. | 09-18-2014 |
20150063341 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus supports at least a second wireless communication scheme between a first wireless communication scheme and the second wireless communication scheme. The first wireless communication scheme requires that a wireless medium is determined to be busy when a reception level is equal to or greater than a minimum reception sensitivity level of a physical scheme. The apparatus includes a first processing unit and a second processing unit. The first processing unit is configured to set a value lower than a maximum transmission power of the first wireless communication scheme, for a maximum transmission power of the second wireless communication scheme and set a value greater than the minimum reception sensitivity level of the physical scheme, for a carrier sense level, when the second wireless communication scheme is used. The second processing unit is configured to carry out carrier sense using the carrier sense level. | 03-05-2015 |