Method of refining node position information in wireless sensor network
First Claim
1. A method of refining a node position information in a wireless sensor network, comprising:
- setting, by a first node, an initial position based on a first anchor node;
receiving a position refining message from the first anchor node;
refining the initial position by measuring a distance to neighboring nodes based on the first anchor node; and
notifying the refined position, by switching into a pseudo anchor node based on the refined position information, and broadcasting the refined position information and a pseudo anchor information to the neighboring nodes to notify that the first node is acting as a pseudo anchor node,wherein in the setting of the initial position, the initial position is refined using three other anchor nodes, including anchor nodes within a two-hop distance, or more than the two-hop distance, when the three other anchor nodes do not exist among the neighboring nodes within a 1-hop distance, andwherein the first anchor node obtains a distance function by learning, using the three other anchor nodes and the pseudo anchor node, and the anchor node provides a newly-entering node with the distance function.
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Abstract
Provided is a method for refining node position information in a wireless sensor network having an ultra wideband communication network and a wireless personal area network where the initial positions of respective nodes are set, by utilizing nodes at a 2-hop distance, or more than a 2-hop distance when the number of neighboring nodes at a 1-hop distance is not sufficient to perform triangulation, and to refine the position of nodes based on a distance measured between the respective nodes. Because the initial position is refined and confirmed in a wireless sensor network, a user node operates as a pseudo anchor node for the nodes which have no anchor node nearby. Furthermore, as a node has the refined position, it can act as a pseudo anchor node and be used to compute the position of the other nodes. Additionally, positions of nodes of the wireless sensor network can be estimated with more accuracy.
14 Citations
8 Claims
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1. A method of refining a node position information in a wireless sensor network, comprising:
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setting, by a first node, an initial position based on a first anchor node; receiving a position refining message from the first anchor node; refining the initial position by measuring a distance to neighboring nodes based on the first anchor node; and notifying the refined position, by switching into a pseudo anchor node based on the refined position information, and broadcasting the refined position information and a pseudo anchor information to the neighboring nodes to notify that the first node is acting as a pseudo anchor node, wherein in the setting of the initial position, the initial position is refined using three other anchor nodes, including anchor nodes within a two-hop distance, or more than the two-hop distance, when the three other anchor nodes do not exist among the neighboring nodes within a 1-hop distance, and wherein the first anchor node obtains a distance function by learning, using the three other anchor nodes and the pseudo anchor node, and the anchor node provides a newly-entering node with the distance function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification