Abstract: A control device includes: a receiving unit that receives a first beacon request for performing registration processing from a communication terminal device; a detection unit that detects a control signal indicating a request for starting the registration processing; a registration control unit that starts the registration processing when the detection unit detects the control signal and executes the registration processing for a certain period; and a transmission control unit that: transmits the beacon signal when the receiving unit receives the first beacon request in a period during which the registration control unit is executing the registration processing; and avoids transmitting the beacon signal when the first beacon request is received in a period during which the registration control unit is not executing the registration processing.

Abstract: A communication device and a communication scheme judgment method that enable reception of frames of different communication schemes without setting a common synchronization signal in the frames for each communication scheme. A signal including synchronization information corresponding to a communication scheme is receivable via a frequency band within which a frequency band of a channel corresponding to a first communication scheme overlaps with at least a portion of a frequency band of a channel corresponding to a second communication scheme.

Abstract: A receiver includes a first detector that detects a Received Signal Strength Indicator of a desiring signal wave transmitted from a transmitter, a second detector that detects a power of interfering wave generated by an external device, a transmission rate selection processor that selects a transmission rate, which is used to transmit a signal from the transmitter to the receiver, from among a plurality of transmission rates based on the detected Received Signal Strength Indicator of the desiring signal wave and a detected power of the interfering wave, when the second detector detects generation of the interfering wave, and a transmission rate notificator that notifies the transmitter of the transmission rate selected by the transmission rate selection processor.

Abstract: A network in which two or more communication schemes coexist, in which a wireless control device identifies a communication scheme of a frame transmitted by a wireless terminal device, making reception possible. The wireless control device, upon detecting a receive signal strength of receive data, determines a signal strength at a non-overlapping frequency band of each communication scheme and thereby judges the communication scheme of the receive data.

Abstract: A communication terminal device includes the following units. A detection unit detects a control signal instructing start of registration processing. A channel selection unit selects at random, from a plurality of frequency channels, the first frequency channel to be used in transmission of a beacon request when the control signal is detected. A scan control unit transmits the beacon request to the control devices by using the selected frequency channel. A receiving unit receives the beacon signal transmitted from each of the control devices. A list storage unit stores a predetermined parameter included in the beacon signal and the frequency channel in association with each other. A registration control unit transmits a registration request signal to the control device.

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: A communication apparatus which communicates data with plural other communication apparatuses by performing wireless communication includes: plural antennas; a communication level obtainment unit which obtains communication levels for the antennas obtained when the communication apparatus performed the wireless communication with the other communication apparatuses; a count unit which counts, for each of the antennas, the number of established communications that is the number of one or more of the other communication apparatuses which successfully established communication through the antenna; an antenna selection unit which selects, when the total number of antennas whose numbers of established communications are greatest is more than one, one of the antennas corresponding to a communication level that is highest among communication levels of plural antennas of the other communication apparatus corresponding to the lowest communication level; and a transmission unit which broadcasts predetermined data to th

Abstract: A communication device includes: a first antenna and a second antenna; a switch unit selecting the first antenna in a first term and the second antenna in a second term; a reception determination unit determining whether or not communication data contained in wireless signals received by the first antenna and the second antenna; and a storage unit storing association between each of communication terminals and one of the first antenna and the second antenna, in which the switch unit sets lengths of the first and second terms so that a ratio of the respective lengths of the first and second terms is equal to a ratio of the number of times the communication data from the communication terminals respectively associated with the first and second antennas and is determined to be successfully obtained.

Abstract: A control device includes: a receiving unit that receives a first beacon request for performing registration processing from a communication terminal device; a detection unit that detects a control signal indicating a request for starting the registration processing; a registration control unit that starts the registration processing when the detection unit detects the control signal and executes the registration processing for a certain period; and a transmission control unit that: transmits the beacon signal when the receiving unit receives the first beacon request in a period during which the registration control unit is executing the registration processing; and avoids transmitting the beacon signal when the first beacon request is received in a period during which the registration control unit is not executing the registration processing.

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 network in which two or more communication schemes coexist, in which a wireless control device identifies a communication scheme of a frame transmitted by a wireless terminal device, making reception possible. The wireless control device, upon detecting a receive signal strength of receive data, determines a signal strength at a non-overlapping frequency band of each communication scheme and thereby judges the communication scheme of the receive data.

Abstract: A communication device and a communication scheme judgment method that enable reception of frames of different communication schemes without setting a common synchronization signal in the frames for each communication scheme. A signal including synchronization information corresponding to a communication scheme is receivable via a frequency band within which a frequency band of a channel corresponding to a first communication scheme overlaps with at least a portion of a frequency band of a channel corresponding to a second communication scheme.

Abstract: A receiver includes a first detector that detects a Received Signal Strength Indicator of a desiring signal wave transmitted from a transmitter, a second detector that detects a power of interfering wave generated by an external device, a transmission rate selection processor that selects a transmission rate, which is used to transmit a signal from the transmitter to the receiver, from among a plurality of transmission rates based on the detected Received Signal Strength Indicator of the desiring signal wave and a detected power of the interfering wave, when the second detector detects generation of the interfering wave, and a transmission rate notificator that notifies the transmitter of the transmission rate selected by the transmission rate selection processor.

Abstract: A communication apparatus which communicates data with plural other communication apparatuses by performing wireless communication includes: plural antennas; a communication level obtainment unit which obtains communication levels for the antennas obtained when the communication apparatus performed the wireless communication with the other communication apparatuses; a count unit which counts, for each of the antennas, the number of established communications that is the number of one or more of the other communication apparatuses which successfully established communication through the antenna; an antenna selection unit which selects, when the total number of antennas whose numbers of established communications are greatest is more than one, one of the antennas corresponding to a communication level that is highest among communication levels of plural antennas of the other communication apparatus corresponding to the lowest communication level; and a transmission unit which broadcasts predetermined data to th

Abstract: A communication terminal device includes the following units. A detection unit detects a control signal instructing start of registration processing. A channel selection unit selects at random, from a plurality of frequency channels, the first frequency channel to be used in transmission of a beacon request when the control signal is detected. A scan control unit transmits the beacon request to the control devices by using the selected frequency channel. A receiving unit receives the beacon signal transmitted from each of the control devices. A list storage unit stores a predetermined parameter included in the beacon signal and the frequency channel in association with each other. A registration control unit transmits a registration request signal to the control device.

Abstract: An energy controller, as a communication device, transmits and receives data by transmitting a signal for establishing transmission and reception of the data to network-connected home appliances. The energy controller includes a power saving control unit that 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; and a wireless communication IF for transmitting the signal containing the information indicating the transmission period to the network-connected home appliances in order to set the network-connected home appliances in an active state with a period according to the transmission period.

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: A communication device includes: a first antenna and a second antenna; a switch unit selecting the first antenna in a first term and the second antenna in a second term; a reception determination unit determining whether or not communication data contained in wireless signals received by the first antenna and the second antenna; and a storage unit storing association between each of communication terminals and one of the first antenna and the second antenna, in which the switch unit sets lengths of the first and second terms so that a ratio of the respective lengths of the first and second terms is equal to a ratio of the number of times the communication data from the communication terminals respectively associated with the first and second antennas and is determined to be successfully obtained.

Abstract: The present invention can prevent a fuzzy image, which is caused due to insufficient bandwidth when the bandwidth necessary for transmitting a content cannot be secured, to be displayed on a display device. When a relay apparatus (100) receives, from a DNS server, a DNS response packet regarding a domain name of a server which transmits a content, a condition judging section (210) in the relay apparatus (100) judges whether a required bandwidth for the content corresponding to the domain name can be secured in a communication path connecting to another relay apparatus (100). If the condition judging section (210) judges that the required bandwidth cannot be secured, a DNS modifying section (250) in the relay apparatus (100) rewrites a reply IP address included in the DNS response packet to an IP address of the relay apparatus (100).

Abstract: A wireless slave device for performing wireless network communication with another wireless slave device, the other wireless slave device being connected to a terminal, and wired network communication with a terminal, the wireless slave device including a wireless reception unit that wirelessly receives a notification frame including a MAC address of the terminal connected to the other wireless slave device and a MAC address of the other wireless slave device, a storage unit that associates and stores the MAC address of the other wireless slave device and the MAC address of the terminal both included in the wirelessly received notification frame, a wire reception unit that receives a frame transmitted from the terminal connected to the wireless slave device, and a filtering unit that discards the frame if the transmission destination MAC address of the frame received by wire does not match the MAC address stored in the storage unit.