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AssigneesNEC Corporation, Tohoku University
InventorsMasatsugu Ogawa, Hisaya Wakayama, Yuma Matsuda, Junpei Kamimura, Masafumi Yano
Estimating the term…
A delay tolerant network is built with the use of a plurality of information transfer devices each of which includes: a communication unit to communicate to and from another device within a communication range that is connected to the information transfer device; and a storing unit to store and keeps collected notification information, and each of which holds delay tolerant communication by exchanging the collected and kept notification information with another device when the exchange becomes possible. Each information transfer device includes a control unit to exchange environment information with another information transfer device, and to execute deriving processing an assigned range that is assigned autonomously to its own information transfer device, based on the environment information that is kept by its own information transfer device, through a planarization search processing in which a value is evened out between its own information transfer device and other information transfer devices.
An information transfer device, comprising:
A delay tolerant network, comprising:
A method of transmitting information in a delay tolerant network, comprising:
A non-transitory computer-readable recording medium having recorded thereon a program for controlling a control unit of an information transfer device for delay tolerant communication, so that the control unit, to exchange environment information with another information transfer device, and to derive an assigned range that is assigned autonomously to the information transfer device, based on the environment information that is kept by the information transfer device, through a planarization search processing of each other in which a value of equal load balances another information transfer device, the assigned range being one of ranges that are shared between the information transfer device and the other information transfer device.
Dependencies are inferred from the claim text.
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No references of this kind are recorded.
Routing or path finding of packets in data switching networks: route discovery packet
Connectivity information management, e.g. connectivity discovery or connectivity update: connectivity information discovery
Connectivity information management, e.g. connectivity discovery or connectivity update: connectivity information update
Network topologies: self-organising networks, e.g. ad-hoc networks or sensor networks
About 7 years 9 months of term left · ends 19 Jul 2034 (estimated)
This invention relates to a delay tolerant communication technology, and to a delay tolerant network for enabling information sharing efficiently via a movable information transfer device for notification information from information sources when the information sources can fail to establish a network connection to each other.
There is an information transmission method in which information terminals that fail to establish a network connection, to each other communicate, by temporarily storing an exchange notification information with each other in the information terminals, and sending the information when wireless communication to and from another information terminal becomes available. This method is commonly called delay tolerant networking (DTN), and the following notification information is called a bundle, a message, or the like. DTN is also an abbreviation of Disruption Tolerant Networking.
The concrete flow of information transmission is as follows in general. A given information terminal determines an arbitrary information terminal as the destination of notification information. But, the given information terminal recognizes that there are no other terminals with which the given information terminal can connect in its communication area at present. In this case, the given information terminal temporarily saves the notification information inside instead of transmitting. When other terminal with which the given information terminal can communicate subsequently enters the communication area, as a result of the moving of the given information terminal itself or the moving of the other terminal, the given information terminal establishes connection to the other terminal within the range of communication to send the temporarily saved notification information.
FIG. 1 is an explanatory diagram illustrating a situation that is mentioned in a description of an embodiment mode of this invention.
FIG. 2 is an explanatory diagram illustrating a schematic method of moving a ferry DTN terminal in the embodiment mode.
FIG. 3 is an explanatory diagram illustrating an example of how to search for an initial cluster and an initial sink in the embodiment mode.
An embodiment mode of this invention is described below with reference to the drawings. Some of technical terms of DTN technology are used in the description given here. Notification information is called a bundle, a message, or the like. Environment information is pieces of information about the condition of a delay tolerant network that is built, such as the locations of individual information devices and clusters within a range where the delay tolerant network is built, the number of ferries, map information, traffic restriction information, and sink locations. Environment information characteristically changes from moment to moment, and is added so as to reflect current conditions by various methods.
Each information transfer device has a scheme for temporarily storing and keeping notification information when the notification information is to be transferred and a path to a destination of the notification information is not determinate, and for exchanging (transferring) the stored notification information when an information exchange with another information transfer device becomes possible.
The information transfer device derives as the need arises a travel strategy for accomplishing an information exchange with another node and a travel range that is assigned to itself, and operates by following a rule derived by itself.