Abstract:
A data-storing-terminal counting unit counts the number of communication terminals in which each of a number of data are stored. Based on the results of the counts, a communication terminal count estimation unit estimates the number of communication terminals that will transmit data with the same timing. An adjustment reference value calculation unit computes an adjustment reference value for constraining the number of communication terminals estimated by the communication terminal count estimation unit to be less than or equal to a preset allowable number. On the basis of the adjustment reference value computed by the adjustment reference value calculation unit, a determination unit determines whether or not to permit transmission of data stored by a storing means. If the determination unit permits the transmission of said data, a data transmission unit transmits the data to a communication terminal in which said data is not stored.
Abstract:
Individual communication terminals are connected to a communication network in which one communication terminal functions as a parent that has a relay function, the other communication terminals function as children, and transmitting and receiving of communication messages between child communication terminals are performed via the parent. Each communication terminal transmits a holding list that lists information about data that the own communication terminal holds, to other communication terminals. Further, each communication terminal temporarily stores holding lists received from other communication terminals. Each communication terminal, while it does not function as a parent, preferentially selects the holding list that does not match that of the own communication terminal and whose transmission source is the parent communication terminal, among the stored holding lists, and, while the own communication terminal functions as a parent, selects any holding list that does not match that of the own communication terminal. Each communication terminal transmits and receives communication messages with another communication terminal that is a transmission source of the selected holding list so that data sharing is performed.
Abstract:
A device management system includes a learning unit 81 for learning a state model representing a normal state of a system including a control target device, based on a control sequence representing one or more time-series commands and data indicating a state of the control target device when the control sequence is issued.
Abstract:
A communication terminal in an ad hoc network has a wireless communication part, a lower layer protocol part operating on a lower layer of the network, and an upper layer protocol part operating on an upper layer of the network. The lower layer protocol part has a routing table holding route information including a destination IP address and a next hop IP address associated with each other. The upper layer protocol part has: an information sharing management part transmitting and receiving a message including an IP address of the local communication terminal to and from a neighbor communication terminal through the wireless communication part by broadcast communication; and a route information registration part registering, into the routing table, the route information including the IP address included in the message received by broadcast communication as the destination IP address and as the next hop IP address.
Abstract:
A communication terminal has a wireless communication part and a control part. The control part sequentially switches a plurality of communication channels and discovers another communication terminal existing around the communication terminal itself. In the case of connecting to the other communication terminal found in the discovery, the control part determines which of the communication terminals transmits a connection request. In a case where the communication terminal itself does not transmit a connection request, the control part stops the discovery process and waists for reception of a connection request from the other communication terminal by using a given communication channel.
Abstract:
This wireless communication terminal is provided with: a short-range wireless communication unit; a data storage unit; a data synchronization unit that synchronizes data by using short-range wireless communications to transmit/receive to/from another wireless communication terminal data that is stored in the data storage unit; and an activation control unit that, at the same time as an activation target structure that is provided to the other wireless communication terminal is activated, activates an activation target structure that includes at least the data synchronization unit and causes the activation target structure to operate so as to synchronize data.
Abstract:
A communication method, a communication system, a wireless terminal, and a wireless control method are provided that make it possible to share information between terminals without forming a group. In a communication method in a wireless communication network including a plurality of terminals (N1 to N3), a first terminal (N1) and a second terminal(N2 or N3) that belong to different groups, or do not belong to a group, can embed arbitrary information in a control frame (101) that is sent and received to search for a terminal or another group in vicinity, and notification information (MSG) of one of the terminals is notified to the other terminal by using the control frame.
Abstract:
The purpose of the present application is to provide a technique for the exchange of path information between different routing domains, which, while reducing the exchange of useless path information in the stage for constructing a hierarchical structure, can maintain robustness of path recognition that tolerates network partition. Of the management communication node identifiers which are described in hierarchical information included in a path control message received from a neighboring communication node and in hierarchical information held by the local communication node and which indicate a communication node that manages each level of the hierarchicalized network structure, the identifier indicating the highest level communication node and the identifier indicating the transmission source communication node are used to identify whether the routing domain to which the aforementioned neighboring communication node belongs is the same as the routing domain of the local communication node, and if the routing domain to which the aforementioned neighboring communication node belongs is different from the routing domain of the local communication node, the path information held by the local communication node is made known.
Abstract:
A method, a system, and a wireless terminal are provided that can search for a neighboring terminal efficiently within a group. In a communication system in a wireless communication network including a plurality of terminals (N10 to N13) that can from a peer-to-peer group, an owner terminal (N10) operating as an access point in one group (G1) designates part (N12) of the client terminals in this group as a searching terminal, and the searching terminal searches for a terminal (N14, N15) that is present in vicinity.
Abstract:
A node device has a delivery predictability management part, a DTN communication part, and a user interface part. The delivery predictability management part stores, for each destination node, delivery predictabilities including a delivery predictability for the destination node calculated by a local node and a delivery predictability for the destination node calculated by a neighboring node. The DTN communication part refers to the delivery predictabilities for each destination node and selects a next hop node in transferring transfer data from the local node to the destination node. The user interface part allows selection of a destination node for DTN communication with the local node as a source node on a basis of the delivery predictabilities for each destination node.