Abstract: A communication system according to an embodiment includes a server system and one or more communication apparatuses. The server system includes a first hardware processor. The first hardware processor determines frequency information indicating processing frequency of predetermined processing executed by the communication apparatuses. The frequency information is determined on the basis of determination information affecting the predetermined processing. The first hardware processor transmits processing frequency of the predetermined processing to the communication apparatuses. The processing frequency is determined on the basis of the frequency information. The communication apparatuses each include a second hardware processor. The second hardware processor receives the processing frequency of the processing from the server system. The second hardware processor executes the predetermined processing on the basis of the received processing frequency.

Abstract: According to one embodiment, a control device includes one or more hardware processors. The one or more hardware processors are configured to: estimate occurrence of a disaster by using risk information indicating a risk of the disaster; confirm necessity of control of an electronic device from a server when the occurrence of the disaster is estimated; determine the necessity of the control according to the estimated disaster when a response is not transmitted from the server with respect to the confirmation of the necessity of control; and transmit an instruction of the control to the electronic device when it is determined that control is necessary or when a response indicating that control is necessary is transmitted from the server.

Abstract: A wireless communication device according to an embodiment is a wireless communication device included in a multi-hop network in which data is relayed in multiple stages in time division communication. A decision unit decides an additional slot, based on identification information received from a child node that transmits data to the wireless communication device. A communication processing unit transmits and receives data using the additional slot and a basic slot assigned based on frame information in the time division communication.

Abstract: An information processing device according to one embodiment includes a hardware processor. The hardware processor functions to receive, from each of communication devices, communication data including sensor data and time information. The sensor data indicates a result of measurement by a sensor of each communication device. The time information indicates a measurement time of the sensor data. The hardware processor functions to specify, as event communication data, the communication data including event sensor data being the sensor data of an event simultaneously occurring in the network. The hardware processor functions to calculate a time delay amount among the communication devices on the basis of the event sensor data and the time information, each being included in the event communication data of each communication device. The hardware processor functions to correct the time information included in the communication data on the basis of the delay amount.

Abstract: A communication device is connected to a plurality of external communication devices. The communication device includes one or more hardware processors. The processors receive frames transmitted from the plurality of external communication devices at timings prescribed for each of the plurality of external communication devices. The processors calculate, for each of the plurality of external communication devices, an arrival ratio indicating a ratio at which transmitted frames have reached the communication device, based on a number of timings in a measurement period and a number of frames received in the measurement period.

Abstract: A communication system according to an embodiment includes a server system and one or more communication apparatuses. The server system includes a first hardware processor. The first hardware processor determines frequency information indicating processing frequency of predetermined processing executed by the communication apparatuses. The frequency information is determined on the basis of determination information affecting the predetermined processing. The first hardware processor transmits processing frequency of the predetermined processing to the communication apparatuses. The processing frequency is determined on the basis of the frequency information. The communication apparatuses each include a second hardware processor. The second hardware processor receives the processing frequency of the processing from the server system. The second hardware processor executes the predetermined processing on the basis of the received processing frequency.

Abstract: A wireless communication device according to an embodiment is a wireless communication device included in a multi-hop network in which data is relayed in multiple stages in time division communication. A decision unit decides an additional slot, based on identification information received from a child node that transmits data to the wireless communication device. A communication processing unit transmits and receives data using the additional slot and a basic slot assigned based on frame information in the time division communication.

Abstract: According to an embodiment, a communication device is connected to a plurality of external communication devices. The communication device includes one or more hardware processors. The processors receive frames transmitted from the plurality of external communication devices at timings prescribed for each of the plurality of external communication devices. The processors calculate, for each of the plurality of external communication devices, an arrival ratio indicating a ratio at which transmitted frames have reached the communication device, based on a number of timings in a measurement period and a number of frames received in the measurement period.

Abstract: According to an embodiment, a wireless communication device includes a memory and one or more hardware processors coupled to the memory. The one or more hardware processors are configured to function as a communication control unit and a determination unit. The communication control unit transmits and receives data to and from a first wireless communication device. The determination unit calculates transmission and reception information based on a transmission and reception result of the data, and variation of received signal intensity of the data, and determines whether to maintain connection to the first wireless device based on the transmission and reception information and the variation. The communication control unit controls communication according to a determination result of the determination unit.

Abstract: A wireless communication device includes a memory and a wireless interface and processing circuitry. The memory configured to store data to be transmitted and received. The wireless interface configured to transmit and receive a wireless signal. The processing circuitry coupled to the memory and configured to receive a message from another wireless device, including destination information and acknowledgement information, via the wireless interface, set, in a first period being a period in which the message from a child node which transmits the message upward while setting the child node itself as a destination is received, the acknowledgement information with respect to data received from the child node, process the message including the destination information and the acknowledgement information, and transmit a message including the set acknowledgement information via the wireless interface to another wireless device.

Abstract: According to one embodiment, a data transmission device, includes: a wireless transmitting circuitry transmitting a wireless signal; measurement circuitry measuring a state of a measurement target at a first sampling rate and acquiring a first measurement value of the state of the measurement target; and controlling circuitry determining whether the first measurement value satisfies a first condition based on a first threshold value. The wireless transmitting circuitry transmits the plurality of first measurement values acquired before the first condition is satisfied when the first condition is satisfied. The measurement circuitry switches the first sampling rate to a second sampling rate higher than the first sampling rate when the first condition is satisfied, measures a state of the measurement target at the second sampling rate, and acquires a second measurement value of the state of the measurement target. The wireless transmitting circuitry transmits the second measurement value.

Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.

Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.

Abstract: According to an embodiment, a wireless communication device includes a memory and one or more hardware processors coupled to the memory. The one or more hardware processors are configured to function as a communication control unit and a determination unit. The communication control unit transmits and receives data to and from a first wireless communication device. The determination unit calculates transmission and reception information based on a transmission and reception result of the data, and variation of received signal intensity of the data, and determines whether to maintain connection to the first wireless device based on the transmission and reception information and the variation. The communication control unit controls communication according to a determination result of the determination unit.

Abstract: According to one embodiment, a data transmission device, includes: a wireless transmitting circuitry transmitting a wireless signal; measurement circuitry measuring a state of a measurement target at a first sampling rate and acquiring a first measurement value of the state of the measurement target; and controlling circuitry determining whether the first measurement value satisfies a first condition based on a first threshold value. The wireless transmitting circuitry transmits the plurality of first measurement values acquired before the first condition is satisfied when the first condition is satisfied. The measurement circuitry switches the first sampling rate to a second sampling rate higher than the first sampling rate when the first condition is satisfied, measures a state of the measurement target at the second sampling rate, and acquires a second measurement value of the state of the measurement target. The wireless transmitting circuitry transmits the second measurement value.

Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.

Abstract: A wireless communication device includes a memory and a wireless interface and processing circuitry. The memory configured to store data to be transmitted and received. The wireless interface configured to transmit and receive a wireless signal. The processing circuitry coupled to the memory and configured to receive a message from another wireless device, including destination information and acknowledgement information, via the wireless interface, set, in a first period being a period in which the message from a child node which transmits the message upward while setting the child node itself as a destination is received, the acknowledgement information with respect to data received from the child node, process the message including the destination information and the acknowledgement information, and transmit a message including the set acknowledgement information via the wireless interface to another wireless device.

Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.

Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.

Abstract: According to an embodiment, a wireless communication device is one of a plurality of wireless communication devices constituting a wireless communication system. The device includes one or more processors configured to have a network topology construction mode and a time-division wireless communication mode. A first cycle as a communication cycle in the network topology construction mode is shorter than a second cycle as a communication cycle in the time-division wireless communication mode.