Ip-usn with multiple and communication method
AssigneeAjou University Industry-Academic Cooperation Foundation
InventorsKi-Hyung Kim, Won-Do Jung, Ali Hammad Akbar
Life of this patent
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Abstract
A router connects an Internet protocol (IP)-ubiquitous sensor network (USN) with an external network. The IP-USN is disclosed when the IP-USN includes one or more routers. An IP-USN with multiple routers includes one or more routers, and sensor nodes in the IP-USN may reliably communicate with the external network. The sensor nodes in the IP-USN may communicate with one another using the router if necessary. When one router does not operate, communication with the external network is performed by using other routers.
Claims21
1-20. (canceled)
An Internet protocol (IP)-ubiquitous sensor network (USN), comprising:
- a plurality of sensor nodes having location information and performing a plurality of functions;
- and
- at least one router that the sensor nodes use for communication with an external network, each of the sensor nodes designating a nearest router with respect to each of the sensor nodes as a default router, and communicating with the external network through the router.
A communication method of an Internet protocol (IP)-ubiquitous sensor network (USN) with multiple routers, the IP-USN including a plurality of sensor nodes having corresponding location information and performing corresponding functions, and a plurality of IP-USN routers that the sensor nodes use for communication with an external network, the communication method comprising:
- broadcasting a router request (RREQ) message at a fixed first frequency, the RREQ message providing the locations of the corresponding sensor nodes;
- storing location information of the sensor nodes in mapping tables of the IP-USN routers that receive the RREQ message;
- broadcasting router advertisement (RA) messages at a fixed second frequency for updating the location information, the RA messages providing the locations of the corresponding routers;
- designating a router that broadcasts the RA messages received via the shortest distance as a default router;
- transmitting the corresponding RREQ message received by the router to another router;
- transmitting a router reply (RREP) message from a default router to a sensor node, when the sensor node broadcasting the RREQ message corresponds to a sensor node that designates the router as the default router;
- and
- communicating between the external network and the sensor node that broadcasts the corresponding RREQ message through the router that transmits the RREP message including the shortest distance information.
Dependencies are inferred from the claim text.