Patent application number | Description | Published |
20090003295 | AD-HOC NETWORK DEVICE WITH REDUCED DATA LOSS - When data is to be transmitted from a transmission source to a transmission destination in a wireless or wired ad-hoc network constructed in an indoor environment such as a house or an office, the data is transmitted by using a path that is formed over a plurality of channels that the respective nodes have. Also, when data transmission with high reliability is to be performed, same data is sent to two or more paths, thereby even when the data on one path cannot be normally delivered due to noise, the data can be delivered to the transmission destination without being affected by the noise by using the data transmitted on another channel. | 01-01-2009 |
20110093717 | NODE APPARATUS, METHOD AND STORAGE MEDIUM - A node apparatus changes a first access key unique to itself; changes a shared key same for node apparatuses; encrypts, using the shared key, the first access key and transmits it; receives an access key notification frame; decrypts it using the shared key, thereby obtaining a second access key; attaches, to a first plaintext frame, first signature data obtained by encrypting, using the shared key, data including a first value calculated from the first plaintext frame; encrypts the first plaintext frame using the second access key and transmits thus encrypted frame; receives a second encrypted frame; decrypts it by the first access key to obtain a second plaintext frame; obtains a second value by decrypting, using the shared key, a second signature data attached to the second plaintext frame; calculates a third value from the second plaintext frame; and confirms whether the second and third values are consistent. | 04-21-2011 |
20110141932 | NODE DEVICE AND COMPUTER READABLE STORAGE MEDIUM STORING PROGRAM - In a node device | 06-16-2011 |
20110176681 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus includes an encryption key generation unit that generates encryption key information at constant encryption key generation intervals, a common key generation unit that generates common key information uniquely with respect to a generation time at common key generation intervals set longer than the encryption key generation intervals, a common key application unit that performs encryption or decryption of the encryption key information by using the common key information, and an encryption key distribution unit that makes a request to a data transmitting/receiving unit to distribute the encryption key information to a plurality of communication apparatuses to be communicated simultaneously at encryption key distribution intervals set shorter than the encryption key generation intervals to perform communication with higher security. | 07-21-2011 |
20120106552 | NODE APPARATUS, STORAGE MEDIUM AND FRAME TRANSMITTING METHOD - When stored identifying information of a transmission target frame and identifying information of a received frame are equal, a node apparatus updates transmission feasibility information stored in association with the final destination of the received frame. The transmission feasibility information indicates feasibility of transmission to each of a plurality of adjacent node apparatuses being a transmission destination, and is updated so that feasibility of transmission to the transmission destination associated with the identifying information of the received frame indicates that “the transmission is infeasible”. The node apparatus transmits the received frame, when there is no adjacent apparatus to which transmission is feasible, and when the stored identifying information of the transmission target frame is equal to the identifying information of the received frame, to the adjacent node apparatus recognized as the origin in association with the identifying information of the received frame. | 05-03-2012 |
20130021945 | NODE APPARATUS AND ALTERNATIVE PATH SEARCH METHOD - Anode apparatus includes: a receiver configured to receive data from a first node apparatus adjacent to the node apparatus, a transmission source of the data being a second node apparatus; a data generator configured to generate transmission data in which the second node apparatus is specified as a final destination; a transmitter configured to transmit the transmission data to an adjacent node apparatus of the node apparatus other than the first node apparatus; and a decision unit configured to decide that an alternative path for transmitting data via an adjacent node apparatus of the node apparatus other than the first node apparatus does not exist between the node apparatus and the second node apparatus, when the node apparatus receives the transmission data transmitted by the transmitter to all adjacent node apparatuses of the node apparatus other than the first node apparatus. | 01-24-2013 |
20130070925 | COMMUNICATION DEVICE, RECORDING MEDIUM, AND METHOD THEREOF - A communication device includes a data storage unit, a decryption unit, an encryption unit, and a judgment unit. The data storage unit stores a piece of encrypted data or a piece of decrypted data. The decryption unit decrypts each provided piece of encrypted data. The encryption unit encrypts each provided piece of decrypted data. The judgment unit issues an instruction to the encryption unit to read from the data storage unit first decrypted data obtained by the decryption unit decrypting first encrypted data with a cryptographic key, and to write back to the data storage unit second encrypted data obtained by the encryption unit encrypting the first decrypted data with the cryptographic key. | 03-21-2013 |
20140022950 | NODE AND LINK FORMATION METHOD - A node receives, from a neighboring node that is a node in the neighborhood, neighboring node information indicating a node that neighbors the neighboring node and determines whether a common neighboring node is present, the common neighboring node being common amongst a neighboring node and a node indicated by the received neighboring node information. When it is determined that the common neighboring node is present, the node registers, in a storage unit, information that a link on a simplex path is to be formed with the common neighboring node or the neighboring node that is the source of the neighboring node information. Alternatively, when it is determined that the common neighboring node is not present, the node registers, in the storage unit, information that a link on a duplex path is to be formed with the neighboring node that is the source of the neighboring node information. | 01-23-2014 |
20140029469 | COMMUNICATION DEVICE AND ROUTE SEARCH METHOD - A node transmits a route search demand, which is a demand to search for a route from the node to a predetermined device among adjacent communication devices, to an adjacent communication device that is not selected as a transmission destination of the route search demand. The node transmits the route search demand when the number of adjacent communication devices serving as confirmed routes is smaller than a predetermined number and when there is an adjacent communication device that has not been selected. The node stops transmission of the route search demand when the number of the adjacent communication devices serving as the confirmed routes reaches the predetermined number. The node transmits a warning to the predetermined device when the number of the adjacent communication devices serving as the confirmed routes is smaller than the predetermined number and when there is no adjacent communication device that has not been selected. | 01-30-2014 |
20140074994 | GATEWAY APPARATUS, COMMUNICATION METHOD OF GATEWAY APPARATUS, NODE APPARATUS, COMMUNICATION METHOD OF NODE APPARATUS, AND COMMUNICATION SYSTEM - A gateway apparatus includes a sorting destination storing unit which stores information of a sorting destination that performs a process according to a destination, a sorting unit which outputs an input destination and transmission data to a sorting destination according to the destination searched from information stored in the sorting destination storing unit, a transmission destination storing unit which stores information of a transmission destination for each destination, an input/output unit which performs a transmission process and a reception process according to a corresponding protocol stack, and a protocol converting unit which assembles, when a destination and transmission data are input from the sorting unit, the destination and the transmission data as data that matches a format of a corresponding protocol stack, and instructs the input/output unit of a corresponding protocol stack to transmit the assembled data to a transmission destination according to the destination. | 03-13-2014 |
20140198666 | DATA TRANSFER METHOD AND NODE APPARATUS THAT USES THE SAME - A node apparatus is provided that determines, according to the route stability indicator of the frame, whether to perform a process of judging whether the frame identification information to identify the frame is stored in a memory as the frame identification information, makes an update, only when a result of the judgment indicates a judgment is to be made on whether the frame identification information to identify the frame is stored in the memory as the frame identification information, the transmission possibility information stored in the memory such that the possibility of transmission to the node apparatus identified by the transmission-destination-node identification information indicates “not transmittable”, and selects, as a transmission-destination node apparatus, one adjacent node apparatus from the plurality of node apparatuses according to the transmission possibility information stored in the memory in association with the ultimate destination of the frame. | 07-17-2014 |
20140198770 | NODE DEVICE, COMMUNICATION METHOD, AND STORAGE MEDIUM - Anode device includes a receiver, a processor, memory, and a transmitter. The receiver receives a path information packet for notification of path information about a network. The processor generates a participation request packet for requesting a first node device selected between an adjacent node device and a node device communicable through the adjacent node device to participate in a first local cluster. The memory stores a path to each affiliated node device affiliated with the first cluster. The transmitter transmits the participation request packet to the first node device. When a number of affiliated node devices which are affiliated with the first cluster exceeds a threshold, the processor generates a generation request packet for requesting a second node device which is not affiliated with the first cluster to generate a second cluster different from the first cluster. The transmitter transmits the generation request packet to the second node device. | 07-17-2014 |
20140219209 | NODE DEVICE AND COMMUNICATION METHOD - A node device includes a transmitter, processor, and a receiver. The receiver receives a packet from an adjacent node device. The processor generates a cluster list and a first hello packet. The cluster list records device identification information of a node device included in a cluster. The cluster is a group of node devices for which route information is stored. The first hello packet reports the route information with cluster identification information of the cluster. The transmitter broadcasts the first hello packet. Upon receipt of, from a free-node device that does not belong to a cluster, a second hello packet that includes information that associates the cluster identification information with device identification information of the free-node device, the processor adds the device identification information of the free-node device to the cluster list until a number of node devices recorded in the cluster list reaches a threshold. | 08-07-2014 |
20140301513 | NODE DEVICE AND METHOD FOR SYNCHRONIZING CLOCK TIMES - A node device includes a processor, a wireless RF circuit, a memory, and a timer. The processor measures a clock time. The wireless RF circuit receives a clock time information frame containing clock time information used for correcting the clock time. The memory stores a transmission processing time period, as a fixed value, from when a transmission source node device of the clock time information frame obtains the clock time information until when the transmission source node device transmits the clock time information frame. The timer measures a reception processing time period, which is a period of time from when the clock time information frame is received until when the clock time information is obtained. The node device sets to the processor a value obtained by adding the fixed value and the reception processing time period to the clock time information. | 10-09-2014 |