Nec Corporation

Juniper Networks, Inc.

Norihito Fujita

Hirofumi Ueda

Masato Yasuda

Atsushi Iwata

Yuichi Ishikawa

Masahiro Jibiki

Norio Yamagaki

Shunichi Kinoshita

Akio Iijima

Yasuhiro Yamasaki

Prakash Chaki

Satoshi Uchida

Yoshihiko Suemura

Soichiro Araki

Kazumine Ogura

Akira Arutaki

Shigeru Asai

Tomoyoshi Sugawara

Tetsuo Imai

Chaki Prakash

Hideaki Sone

Hideaki Goto

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.

Wireless communication terminal, non-transitory computer-readable storage medium, and information processing method

A communication method and a system are provided that make it possible to transfer information between groups. The communication method is a communication method in a wireless communication network including a plurality of nodes that can form a peer-to-peer group, wherein an owner node operating as an access point in one group selects one or a plurality of client nodes within this group as delivery nodes, the delivery node disconnects from the group and connects to another group that is present in vicinity, and information is transferred between the delivery node and an owner node of the another group.

Method and system for communication between groups in wireless communication network

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 (Nto N), a first terminal (N) and a second terminal(Nor N) that belong to different groups, or do not belong to a group, can embed arbitrary information in a control frame () 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.

Communication method, communication system, wireless terminal, and communication control method in wireless communication network

A first communication terminal, unconnected with a communication network, searches for a second communication terminal existing around the own communication terminal. In the communication network, one of a plurality of communication terminals functions as a master having a function of an access point, and the rest of the communication terminals function as slaves of the master. Based on the information included in a communication message received from one or more second communication terminals found through the search, the first communication terminal determines a second communication terminal which serves as a connection counterpart from among the second communication terminals, and configures a communication network with the determined connection counterpart.

Communication terminal

Provided are a communications state determination device, etc., capable of improving the accuracy of network state specification. This communications state estimation device comprises: a setting means that, in accordance with given communications parameters, applies the communications parameters to a communications device that determines the occurrence of communications errors in communications with a communications destination device; a detection means that sends communications instructions to the communications device that performs communications, in accordance with received communications instructions, and detects the occurrence of communications errors that have been determined in the communications that are in accordance with the instructions; and an estimation means that estimates whether or not the communications device can perform the communications, on the basis of the communications parameters and the existence or otherwise of communications errors.

Communications state estimation device, communications state estimation method, and storage medium that stores communications state estimation program

A method to reduce group reformation time and maintain seamless connectivity in a peer-to-peer network at the time of disappearance of the Group Owner (GO). Each of the nodes is provided with an emergency leader list which prioritizes a predetermined number of emergency leader nodes each of which is a client node having intent of acting as an emergency leader, wherein the emergency leader list is prepared right at the time of group formation. The emergency leader nodes broadcast beacons when a leader node disappears from the group without notice. Each of the client nodes barring a first-priority emergency leader node of the emergency leader list connects to a highest priority one of emergency leader nodes detected by the client node.

Group reformation mechanism for reducing disruption time in wireless peer to peer networks

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.

Delay tolerant network (DTN) and ad-hoc node device

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.

Communication terminal, communication method, storage medium on which communication program is stored, and communication system

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.

Connection control method by communication terminal

A first communication terminal, unconnected with a communication network, searches for a second communication terminal existing around the own communication terminal. In the communication network, one of communication terminals functions as a master having a function of an access point and the rest of the communication terminals function as slaves of the master. Among the one or more second communication terminals found through the search, the first communication terminal determines a second communication terminal, in which information included in a communication message received from the second communication terminal shows that it is a connected master terminal which is a terminal connected with the communication network and functions as the master, to be a connection counterpart. Then, the first communication terminal configures a network with the determined connection counterpart.

Network communication method

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.

Path information exchange method, communication node, communication system, and communication node program

A communication system that improves the total throughput of the communication is provided. A communication system () according to the present invention includes a plurality of terminals and an access point () with which the terminals communicate. The terminal acquires the number of terminals in a communication network of the access point (), and divides, based on the number of terminals, the plurality of terminals into groups so that each group includes the number of terminals equal to or smaller than the number of terminals permitted to communicate with the access point () within a predetermined period. The terminal allocates the group to the predetermined period, and determines, based on the group to which a terminal belongs, whether to permit data transmission within the predetermined period to which the group is allocated.

Communication system, communication device, communication control method, and non-transitory computer readable medium

A request possibility determination unitfor a communications terminal-determines whether or not communications time required for obtaining data from a communications terminal-can be secured, between the communications terminal-and the communications terminal-. A data acquisition unit: determines data that has not been stored in a data storage unit, among data on a list received as a result of a communications message from another communications terminal-; and requests the determined data from the communications terminal-, by using a communications message on the condition that the request possibility determination unithas determined that communications time can be secured.

Data sharing system

A storage part stores the history of a failure in connection to the other communication device. A searching part performs search for the other communication device. A connection availability determination part performs determination whether or not to connect to the other communication device found in the search on the basis of the history. A connection control part causes the searching part to perform the search again in a case where it is determined not to connect. On the other hand, in a case where it is determined to connect, the connection control part executes a connection process of connecting to the other communication device and, when the connection process fails, the connection control part performs update of the history and causes the searching part to perform the search again.

Communication device

A node deviceis configured to: allocate a channel for communication to each of radio interfaces; between the radio interface and a radio interface which is included by an adjacent node device and to which the same channel as the channel allocated to the radio interface is allocated, establish a communication link using the channels; and, by using a communication link (a use communication link) set for the destination of received data among established communication links, transfer the data to the adjacent node device. The node devicespecifies an unused channel that is other than a channel used by a communication link set as the use communication link among already allocated channels (), and releases allocation of the unused channel ().

Growing community of inventors

Tokyo, Japan

Norihito Fujita