Abstract: A communication system includes: distributed control devices that use a first wireless communication to form network cells and to control communication devices coupled to the network cells based on multi-hop communication; relay devices coupled to a network cell that use the first wireless communication to transfer data between the distributed control devices; and a central control device that manages communication paths for transferring the data among the distributed control devices located in the communication path.

Abstract: A communication system includes multiple first communication devices and second and third communication devices. Each first communication device performs first wireless communication using a directive radio wave using first and second function modules; performs second wireless communication wider in communication range than the first wireless communication using a third function module; and generates different network cells. The second communication device performs the first wireless communication with the first function module and connects to one of the network cells. The third communication device manages a multi-hop communication path using the second wireless communication.

Abstract: A communication system includes: a plurality of distributed control devices, each of which is configured to utilize a first wireless communication for forming a network cell and controlling at least one communication device coupled to the network cell to transfer data via the first wireless communication, based on a communication path of multi-hop communication; at least one relay device coupled to a network cell formed by one of the plurality of distributed control devices and configured to utilize the first wireless communication for transferring the data from the one of the plurality of distributed control devices to another one of the plurality of distributed control devices; and a central control device configured to utilize a second wireless communication for managing the communication path and controlling the plurality of distributed control devices located in the communication path to transfer the data, based on the communication path.

Abstract: A communication system includes multiple first communication devices and second and third communication devices. Each first communication device performs first wireless communication using a directive radio wave using first and second function modules; performs second wireless communication wider in communication range than the first wireless communication using a third function module; and generates different network cells. The second communication device performs the first wireless communication with the first function module and connects to one of the network cells. The third communication device manages a multi-hop communication path using the second wireless communication.

Abstract: A wireless communication system includes a first wireless communication apparatus and multiple second wireless communication apparatuses.

Abstract: A communication system includes a first communication apparatus, a second communication apparatus, and a third communication apparatus. The first communication apparatus transfers content data to the second communication apparatus and the third communication apparatus using wireless communication. The second communication apparatus includes a first communication unit that transfers first control data including a reception request for receiving the content data transferred by the first communication apparatus if the wireless communication between the second communication apparatus and the first communication apparatus is disconnected. The third communication apparatus includes a second communication unit that transfers the content data transferred by the first communication apparatus to the second communication apparatus using the wireless communication if the third communication apparatus receives the first control data from the second communication apparatus.

Abstract: A communication system includes a plurality of first communication devices to form different network cells through first wireless communication, and a second communication device to communicate with the first communication devices through the first wireless communication. The second communication device includes: a first memory to store connection information for establishing a connection with the plurality of first communication devices through the first wireless communication; a communication circuit to connect, when data is received from one first communication device among the plurality of first communication devices, the second communication device with other first communication device different from the one first communication device through the first wireless communication using the connection information; and circuitry to transfer the data received from the one first communication device by the second communication device to the other first communication device.

Abstract: A wireless communication system includes multiple wireless communication devices including a first wireless communication device that centrally controls a plurality of second wireless communication devices and compatible with a multiple wireless communication standards. The multiple wireless communication standards includes a first wireless communication standard and one or more wireless communication standards using a frequency band lower than that of the first wireless communication standard. The first wireless communication device includes a receiver, a determination unit, and a transmitter. The plurality of second wireless communication devices each establish the wireless communication using the first wireless communication standard based on the routing information that each of the plurality of second wireless communication devices itself acquires from the first wireless communication device.

Abstract: A wireless communication system includes a first wireless communication apparatus and multiple second wireless communication apparatuses.

Abstract: In a communication system incorporating a communication apparatus that transfers/receives a TS packet using MPEG-2-TS to synchronize a video signal with an audio signal includes a communication circuit to pad the TS packet with a null frame to reach a prescribed frame size when storing the TS packet that includes a PCR value in a frame. In the communication apparatus, the communication circuit deletes the null frame in the TS packet when receiving the TS packet. The communication apparatus further includes an encoder that outputs a PCR report signal that indicates that the generated TS packet includes the PCR value to the communication circuit. In the communication apparatus, the size of the frame is set in multiples of the size of the TS packet. The communication apparatus further includes an input device to configure whether the TS packet is padded automatically or manually.

Abstract: A communication system includes a first communication apparatus, a second communication apparatus, and a third communication apparatus. The first communication apparatus transfers content data to the second communication apparatus and the third communication apparatus using wireless communication. The second communication apparatus includes a first communication unit that transfers first control data including a reception request for receiving the content data transferred by the first communication apparatus if the wireless communication between the second communication apparatus and the first communication apparatus is disconnected. The third communication apparatus includes a second communication unit that transfers the content data transferred by the first communication apparatus to the second communication apparatus using the wireless communication if the third communication apparatus receives the first control data from the second communication apparatus.

Abstract: In a wireless communication system, a wireless transmitter generates a TS packet that includes a PCR value based on a timer value for a time preceding an offset time from start time of a PCR time slot and transfers a wireless frame that includes the TS packet with the PCR value at start time of the PCR time slot. The wireless receiver receives the wireless frame that includes the TS packet with the PCR value at the PCR time slot, measures propagation time of the wireless frame between the start time of the PCR time slot and time when the wireless frame that includes the TS packet with the PCR value is received, obtains sum of the offset time and the propagation time as delay time of the PCR value, and adjusts its timer value based on the PCR value acquired from the wireless frame and the obtained delay time.

Abstract: A wireless communication system includes multiple wireless communication devices including a first wireless communication device that centrally controls a plurality of second wireless communication devices and compatible with a multiple wireless communication standards. The multiple wireless communication standards includes a first wireless communication standard and one or more wireless communication standards using a frequency band lower than that of the first wireless communication standard. The first wireless communication device includes a receiver, a determination unit, and a transmitter. The plurality of second wireless communication devices each establish the wireless communication using the first wireless communication standard based on the routing information that each of the plurality of second wireless communication devices itself acquires from the first wireless communication device.

Abstract: In the invention, wireless communication devices transmit beacon frames in an order in compliance with a CSMA/CA protocol. A wireless communication device as a transmitting station of a multicast frame uses one of the beacon frames to notify wireless communication devices as receiving stations of the multicast frame that an ACK frame is to be transmitted when the multicast frame is received. On receipt of the multicast frame, the wireless communication devices as the receiving stations transmit ACK frames in order of transmitting the beacon frames at SIFS intervals.

Abstract: In a communication system incorporating a communication apparatus that transfers/receives a TS packet using MPEG-2-TS to synchronize a video signal with an audio signal includes a communication circuit to pad the TS packet with a null frame to reach a prescribed frame size when storing the TS packet that includes a PCR value in a frame. In the communication apparatus, the communication circuit deletes the null frame in the TS packet when receiving the TS packet. The communication apparatus further includes an encoder that outputs a PCR report signal that indicates that the generated TS packet includes the PCR value to the communication circuit. In the communication apparatus, the size of the frame is set in multiples of the size of the TS packet. The communication apparatus further includes an input device to configure whether the TS packet is padded automatically or manually.

Abstract: In a wireless communication system, a wireless transmitter generates a TS packet that includes a PCR value based on a timer value for a time preceding an offset time from start time of a PCR time slot and transfers a wireless frame that includes the TS packet with the PCR value at start time of the PCR time slot. The wireless receiver receives the wireless frame that includes the TS packet with the PCR value at the PCR time slot, measures propagation time of the wireless frame between the start time of the PCR time slot and time when the wireless frame that includes the TS packet with the PCR value is received, obtains sum of the offset time and the propagation time as delay time of the PCR value, and adjusts its timer value based on the PCR value acquired from the wireless frame and the obtained delay time.

Abstract: A wireless communication apparatus transmits a packet that includes a destination address, a source address, and a frame body over a wireless network. The wireless communication apparatus computes a first calculation value for use in detecting packet falsification based on a destination address, a source address, and a frame body by using a predetermined computation method, and stores the first calculation value that is associated with the destination address. When a second packet is to be transmitted to a same destination address that is the same as the destination address stored in the storage unit, the wireless communication apparatus computes a second calculation value using the first calculation value stored in the storage unit and the frame body contained in the second packet by using the predetermined computation method.

Abstract: In the invention, wireless communication devices transmit beacon frames in an order in compliance with a CSMA/CA protocol. A wireless communication device as a transmitting station of a multicast frame uses one of the beacon frames to notify wireless communication devices as receiving stations of the multicast frame that an ACK frame is to be transmitted when the multicast frame is received. On receipt of the multicast frame, the wireless communication devices as the receiving stations transmit ACK frames in order of transmitting the beacon frames at SIFS intervals.

Abstract: In a wireless communication method, a wireless communication device on a transmission side transmits a multicast frame to a plurality of wireless communication devices on a reception side in a wireless communication network including the wireless communication devices. The wireless communication method includes: transmitting beacon frames in order by the wireless communication devices; burst-transferring a plurality of multicast frames by the wireless communication device on the transmission side; and transmitting a response frame containing information that indicates whether each of the multicast frames is successfully received, in the order in which the beacon frames are transmitted, by the wireless communication devices on the reception side.

Abstract: A radio communication device includes: a beacon cycle determination unit configured to determine a beacon cycle for transmitting a beacon based on a sum of a number of time slots that is included in a beacon transmitted by another radio communication device and that the other radio communication device requests for transmitting data and a number of time slots to be requested by the radio communication device for transmitting data; and a packet transmit and receive control unit configured to control the radio communication device, according to the beacon cycle determined by the beacon cycle determination unit, to transmit a packet at a time slot and to receive a packet from another radio communication device at a time slot different from the time slot for transmission.