Abstract: A wireless communication device includes: a wireless communicator and a communication controller.

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 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 wireless communication device includes: a wireless communicator and a communication controller.

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 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: 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 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.

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: Provided is, a wireless network that conducts wireless communications having superior latency and power-saving performance, while avoiding interference wave influences by using multiple channels. Besides conducting communications with wireless communication terminals 102 to 104 by switching a channel in each beacon period and transmitting a beacon frame, a control device 101: measures communication conditions of the channel and interference wave influences; determines availability of the channel; and stores available channel information. The control device 101 delivers the available channel information in the beacon frame to the terminal devices 102 to 104. The terminal devices 102 to 104: select an optimum channel by switching the channel in each beacon period depending on the available channel information in the received beacon frame and on transmission conditions of the channel used by oneself; and conduct the wireless communications.

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: A reception station 1b compares its BSSID with BSSID included in a signal that has arrived thereat. As BSSIDs included in signals transmitted by interfering stations 1c and 1d both match BSSID of the reception station 1b, the reception station 1b identifies each of the interfering stations 1c and 1d as a non-suppression target transmission source. As neither of BSSIDs included in signals transmitted by interfering stations 2a and 2b matches BSSID of the reception station 1b, the reception station 1b identifies each of the interfering stations 2a and 2b as a suppression target transmission source. The reception station 1b uses characteristic amounts of signals that are associated with the interfering stations (i.e., suppression target transmission sources) 2a and 2b and that have been measured in the past as characteristic amounts of interfering signals that are used to suppress the interfering signals from a received signal.

Abstract: Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.