Abstract: A mobile device includes a position sensing unit, a remote control information obtainment unit, and a storage unit. Position information obtained by the position sensing unit is stored in the storage unit in association with remote control information. The mobile device further includes a directional space obtainment unit and an apparatus specification unit. The mobile device recognizes a direction pointed by a user using the mobile device, and enables operation of a terminal apparatus existing in the pointing direction.

Abstract: A communication device according to the present invention includes: a receiving unit which receives a block transmitted by a communication device; a photocurrent measuring unit which measures a reception quality of the received block; a PHY rate determining unit which determines, based on the reception quality, a PHY rate that is used by the communication device for transmitting a next block; a block size control unit which determines, based on the measured reception quality, a block size; and a transmission unit which transmits feedback information including the determined PHY rate and the determined block size to the communication device, and the block size control unit determines the block size to be a value smaller than a maximum value of a block size that can be transmitted by the communication device, when a value indicating the reception quality of the block is within a predetermined range including a PHY rate threshold.

Abstract: A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication termin

Abstract: A control point device that reduces delay in a power-saving wireless network includes a normal data generating unit that generates 1st-type data, a preferential data generating unit that generates 2nd-type data different from the 1st-type data, a determining unit that determines an active period length, a beacon generating unit that generates a broadcasting signal including information corresponding to the determined length of the active period, and a transmitting unit that transmits the broadcasting signal to the terminal on a frame basis. The determining unit shortens the length of the active period when the preferential data generating unit generates the 2nd-type data, and a preferential data period is set in an ex-active period obtained by the shortening of the active period, the preferential data period being a period during which the 2nd-type data is transmitted. The transmitting unit transmits the 2nd-type data to the terminal during the preferential data period.

Abstract: A relay device according to the present invention includes: a receiving unit which receives a frame; a transmitting unit which transmits a frame; a frame determination unit which stores therein the first frame when the frame determination unit determines that the received frame is the first frame; a proxy ACK generation unit which generates a third frame which is a proxy frame of a second frame which is a frame to be transmitted from the receiving device, as a receipt acknowledgement to the first frame; and a communication control unit which: causes the transmitting unit to transmit the third frame; sets an extended active period in the inactive period subsequent to the active period; and transmits the first frame in the extended active period when the receiving unit does not receive the second frame within a predetermined period after reception of the first frame.

Abstract: The communication terminal includes: a receiving unit and a transmission unit which serve as a communication unit for signal exchange; a beacon processing unit as a first detection unit that detects, for each channel, the number of the other communication terminals performing wireless communication by receiving a terminal number notification signal from a control device; a data processing unit as a second detection unit that counts, for each channel, the number of the other communication terminals found by receiving acknowledgement signals transmitted from the other communication terminals; a channel control unit that selects a frequency channel having a least difference between the number detected by the beacon processing unit and the number counted by the data processing unit, and causes the receiving unit and the transmission unit to perform the signal exchange via the selected frequency channel.

Abstract: A control device according to the present invention comprises a receiving unit which receives, in the network, a multi-address message transmitted from each of the terminal devices, a determining unit which determines whether or not the received multi-address message is to be translated into a unicast message to be transmitted to a specified terminal device, based on information contained in the multi-address message, the specified terminal device being included in the terminal devices, a translating unit which translates the multi-address message into the unicast message when the determining unit determines that the multi-address message is to be translated, and a transmitting unit which transmits the unicast message to the specified terminal device.

Abstract: A wireless communication system includes a wireless terminal and a plurality of base stations that can communicate with each other via a predetermined communication path that is different from the wireless communication path to the wireless terminal. The wireless terminal transmits a request signal to one of the base stations to request a response signal from another base station. The one base station transfers the received request signal to the other base station via the predetermined communication path. Upon reception of the request signal transferred from the one base station, the second base station transmits a response signal to the wireless terminal via the predetermined channel. The wireless terminal receives the response signal transmitted from the second base station via the predetermined channel.

Abstract: A terminal device, used in communication system conducting communication by periodically switching frequency channels in a predefined sequence, communicates with a control device using a predefined channel.

Abstract: Provided is a communication apparatus which allows multi-rate control causing less waste of communication band as compared to conventional, the communication apparatus according to the present invention includes: the wireless communication unit for performing wireless communication with the terminal apparatus; a transfer rate setting unit for setting a transfer rate; a beacon generation unit for generating a beacon which is a first control signal; and a control unit for causing the wireless communication unit to wirelessly transmit, for every predetermined period, the beacon, and, to cause the wireless communication unit to wirelessly transmit the beacon, the control unit causes the transfer rate setting unit to set a transfer rate different from the transfer rate previously used for the wireless transmission of the beacon, and causes the wireless communication unit to transmit the beacon to the terminal apparatus.

Abstract: In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.

Abstract: In a receiver, a channel estimation unit estimates channel characteristics of each channel, and a weight generation unit generates a weight matrix used in equalization processing by an equalizer in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit. Furthermore, a likelihood calculation unit calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit, and an adaptive control unit determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit, notifying the transmitter of the determined transmission rate.

Abstract: A relay device receives transfer data from a transfer-source terminal and transfers the received transfer data to a transfer-destination terminal via relaying performed by another relay device. When the transfer data is received, the relay device establishes a direct communication with the other relay device, if information regarding the other relay device is attached to the received transfer data. If information regarding the other relay device is not attached, then the relay device attaches information regarding itself to the transfer data and transfers the resulting transfer data to a wireless control station.

Abstract: An energy controller (10) as a communication device for transmitting and receiving data by transmitting a signal for establishing transmission and reception of the data to network-connected home appliances (11a to 11c), the energy controller (10) including: a power saving control unit which determines a transmission period such that the transmission period during which the signal is transmitted is increased as a power value difference increases, which is a value obtained by subtracting the total power consumption value of a power consumption appliance from available power supply value to the power consumption appliance including the network-connected home appliances (11a to 11c); and wireless communication IF (22) for transmitting the signal containing the information indicating the transmission period to the network-connected home appliances (11a to 11c) in order to set the network-connected home appliances (11a to 11c) in an active state with a period according to the transmission period.

Abstract: A terminal (10) includes: a wireless transmission and reception unit (11) that transmits or receives a signal using a frequency channel selected by switching between a plurality of frequency channels; an interference detection unit (12) that determines, for each of the plurality of frequency channels, whether or not interference occurs when transmitting or receiving the signal using the frequency channel; and a frequency channel priority control unit (13) that sets a priority used when the wireless transmission and reception unit (11) transmits or receives the signal, according to a result of the determination by the interference detection unit (12). The wireless transmission and reception unit (11) transmits or receives the signal according to the priority.

Abstract: A wireless communication device capable of receiving a content by securing a band as much as possible, if a predetermined band is required to be secured when the content is received by wire. The wireless communication device judges whether or not the predetermined band necessary for receiving the content can be secured with a wireless master device. When it is judged that the predetermined band cannot be secured, the wireless communication device switches a connection destination from the wireless master device to which the wireless communication device has been connected to a different wireless master device that can secure the predetermined band, e.g., a predetermined receiving electric field strength.

Abstract: Provided is a communication method for improving the communication quality of multicast transmission. A grouping table storage section stores a grouping table in which Ack return order positions indicating priority orders of the reception terminals which each return an Ack, and addresses of the reception terminals are set. An Ack return order position notification frame creation section notifies each reception terminal of a corresponding Ack return order position based on the grouping table. An Ack return permission information determination section refers to the grouping table, determines the number of reception terminal that are to be permitted to return an Ack, and creates Ack return permission information in which information about the reception terminals that are to be permitted to return an Ack is set, based on the determined number of reception terminals. A multicast creation section creates a multicast containing the Ack return permission information and transmission data.

Abstract: The communication device can easily serve as an extended user interface such as a remote controller of a target apparatus without causing any complicated operations to a user. The communication device includes the following units. An apparatus information obtainment unit (203) obtains apparatus information from an apparatus. A position information obtainment unit (206) obtains position information of the communication device (102). An operation information obtainment unit (212) obtains operation information based on the apparatus information. A storage unit (213) stores the position information as apparatus position information indicating as a position of the apparatus, in association with the operation information. A direction sensor unit (207) detects direction of the communication device (102). A directional space calculation unit (208) calculates a directional space of the communication device (102).

Abstract: A mobile communication device (98b) includes: an appliance information obtainment unit (98n) that obtains appliance information (98n1) by proximity wireless communication (98c1) with an appliance (98a) installed in a home (99), the appliance information specifying the appliance (98a); a position information obtainment unit (98j) that obtains position information (98j1) of the mobile communication device when the proximity wireless communication (98c1) is performed; and a transmission unit (98o) that transmits transmission information (98o1) to a server (98c) in the case where the proximity wireless communication (98c1) is performed, the transmission information including the appliance information (98n1) and the position information (98j1).

Abstract: In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.