Patent application number | Description | Published |
20120252509 | WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION APPARATUS - A wireless communication method includes starting, at a first wireless communication apparatus and a second wireless communication apparatus respectively, transmission of a wireless signal, when received power of a wireless signal transmitted from another wireless communication apparatus is smaller than or equal to a carrier sense threshold value, transmitting, from the first wireless communication apparatus, a wireless signal, and determining, at the second wireless communication apparatus, whether or not to receive a data signal following a first signal included in the wireless signal received from the first wireless communication apparatus, based on at least one of received power of the first signal and a transmission destination included in the wireless signal. | 10-04-2012 |
20130077567 | WIRELESS TERMINAL, GATEWAY SELECTION METHOD, AND WIRELESS NETWORK SYSTEM - A wireless terminal includes a detection section that detects, from a packet received from a plurality of gateways, a control packet broadcast from the plurality of gateways, a candidate specifying section that specifies a plurality of gateways as candidates for connection from a sender gateway that sent the detected control packet, and a selection section that selects one of the specified gateways as a gateway for establishment of connection. | 03-28-2013 |
20130100937 | WIRELESS STATION, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A wireless station includes a receiver configured to receive a packet, a processor configured to set a retransmission start time of a packet transmitted to another wireless station based on the received packet, and a transmitter configured to control transmission of a packet that is the same as the transmitted packet in accordance with whether a response signal responsive to the transmitted packet is received before the set retransmission start time is reached. | 04-25-2013 |
20130148507 | APPARATUS AND METHOD FOR TRANSMITTING DATA TO A WIRELESS COMMUNICATION DEVICE - An apparatus estimates an influence rate at which transmission of data to a first wireless communication device is influenced by a second wireless communication device that is undetectable by means of carrier sense. The apparatus determines transmission quantity based on the estimated influence rate, and detects a congestion state of the first wireless communication device. The apparatus transmits data to the first wireless communication device according to the determined transmission quantity when congestion for the first wireless communication device is detected. | 06-13-2013 |
20130201970 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION CONTROL METHOD, AND WIRELESS COMMUNICATION DEVICE - Each node transmits to a destination node a registration packet indicating that a local node is a node to request packet transmission. Each node transmits a packet to the destination node within a transmission time reported from the destination node. The destination node receives a registration packet from each node, and calculates a traffic amount to occur in each path for every path going through an adjacent node that enables direct communication with the destination node. The destination node assigns a transmission time to transmit the packet to the each path based on the calculated traffic amount of each path and reports the assigned transmission time to each node. | 08-08-2013 |
20130229907 | WIRELESS STATION, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A second wireless station includes a communicating unit that transmits a packet to a first wireless station and retransmits the packet when a response signal for the packet is not received by a predetermined response time limit; an acquiring unit that acquires from the first wireless station, transmission prohibition period information indicating a transmission prohibition period during which transmission of a signal by the first wireless station is prohibited; and a postponing unit that postpones the response time limit in the transmission prohibition period indicated by the acquired transmission prohibition period information to be after the transmission prohibition period ends. | 09-05-2013 |
20130286870 | WIRELESS TERMINAL DEVICE, WIRELESS COMMUNICATION SYSTEM AND CONTROL METHOD FOR WIRELESS TERMINAL DEVICE - A wireless terminal device includes: a processor connected to a memory, configured to: acquire an estimated reception sensitivity of the wireless terminal device based on reception powers from a plurality of other wireless terminal devices with which the wireless terminal device performs random access communication, notify the other wireless terminal devices of the estimated reception sensitivity of the wireless terminal device, and select a transmission destination from among the other wireless terminal devices based on requested reception powers of the other wireless terminal devices, the requested reception powers being calculated based on estimated reception sensitivities of the other wireless terminal devices notified from the other wireless terminal devices. | 10-31-2013 |
20130294244 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A communication device includes: a packet receiving unit that receives, via a wireless ad hoc network, a packet transmitted from a node device; a congestion detection unit that detects, based on the packet received by the packet receiving unit, that congestion occurs in a communication path along which the packet reaches the packet receiving unit; a congestion control message generating unit that generates, when the congestion detection unit detects that the congestion occurs in the communication path, a congestion control message that instructs to take an action to avoid the congestion in the communication path; and a message transmitting unit that transmits the congestion control message generated by the congestion control message generating unit to the node device. | 11-07-2013 |
20140056129 | RADIO STATION, ROUTING METHOD AND RADIO COMMUNICATION SYSTEM - A radio station includes a weighting factor determining unit that outputs a value larger than one as a weighting factor when a traffic amount of an adjacent radio station positioned in a communicable range of the radio station exceeds a certain threshold, and a cost calculating unit that calculates a radio quality cost based on radio quality for each link between the radio station and each adjacent radio station, regards a multiplication result of the obtained radio quality cost and the weighting factor as a link cost when there is an input of the weighting factor from the weighting factor determining unit, and regards the obtained radio quality cost as a link cost when there is no input of a weighting factor from the weighting factor determining unit. | 02-27-2014 |
20140140229 | MULTI-HOP COMMUNICATION TERMINAL, MULTI-HOP COMMUNICATION SYSTEM, AND MULTI-HOP COMMUNICATION METHOD - In a gateway (GW), when interference is detected by an interference detection unit, a frame generation unit sends an interference broadcast signal. A terminal receives the interference broadcast signal sent at a maximum transmission power from the GW to which the terminal belongs. The interference broadcast signal includes information on a planned transmission power value that is a transmission power value of a data signal in the GW and is smaller than the maximum transmission power value. The interference broadcast signal is sent at the maximum transmission power value. | 05-22-2014 |
20140140230 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, TRANSMITTING TERMINAL, AND RECEIVING TERMINAL - A wireless communication system constitutes a wireless ad hoc network. A plurality of wireless terminals include a receiving terminal and a plurality of the transmitting terminals. Each of the transmitting terminals executes direct communication or indirect communication. The wireless communication system includes a first obtainer that obtains a reception side terminal number which is the number of the wireless terminals with which the receiving terminal is able to communicate directly, a second obtainer that obtains a transmission side terminal number which is the number of the wireless terminals with which a target transmitting terminal, which is one of the plurality of transmitting terminals, is able to communicate directly, and a setter that selects one of the direct communication and the indirect communication based on the reception side terminal number and the transmission side terminal number, and sets the target transmitting terminal so as to execute the selected communication. | 05-22-2014 |
20140140272 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, AND TRANSMITTING TERMINAL - A wireless communication system includes a plurality of wireless terminals. Each of transmitting terminals executes direct communication or indirect communication. The wireless communication system includes a first obtainer that obtains a reception side terminal number which is the number of the wireless terminals with which the receiving terminal is able to communicate directly, a second obtainer that obtains a transmission side terminal number which is the number of the wireless terminals with which the transmitting terminal is able to communicate directly for each of a target transmitting terminal and a neighboring transmitting terminal, and a setter that selects one of the direct communication and the indirect communication based on the reception side terminal number, the transmission side terminal number for the target transmitting terminal, and the transmission side terminal number for the neighboring transmitting terminal, and executes the selected communication. | 05-22-2014 |