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Browsing by Author "Wu Chao-Nan"

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    Power-efficient backbone-oriented wireless sensor network, method for constructing the same and method for repairing the same
    (2013-04-23)
    Huang Kuei-Li
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    Wu Chao-Nan
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    Wang Jui-Tang
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    Tseng Chien-Chao
    The present invention discloses a power-efficient backbone-oriented wireless sensor network, a method for constructing the same and a method for repairing the same, wherein energy-rich nodes are used to form backbones linking to a server, and wherein regular nodes having limited energy storage link to the backbones. When one energy-rich node malfunctions, the energy-rich node, which is posterior to the malfunctioning energy-rich node, searches for and links to a linkable neighboring energy-rich node on the backbone. If there is none linkable neighboring energy-rich node, the regular nodes are used to form a temporary tunnel until the malfunctioning energy-rich node has been repaired. The present invention can relieve the influence of hot spots, increase the robustness of the wireless sensor network, and prolong the service life of the wireless sensor network.
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    Routing method and routing path recovery mechanism in wireless sensor network environment
    (2011-07-19)
    Lai Jun-Yu
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    Huang Kuei-Li
    ;
    Wang Jui-Tang
    ;
    Tseng Chien-Chao
    ;
    Wu Chao-Nan
    The present invention discloses an asymmetric routing method and routing path recovery mechanism. The wireless sensor network environment includes at least a management unit, at least a gateway, and mobile nodes. When joining, each mobile node obtains an unique ID code and, additionally, a depth as the gradient to the management unit. Accordingly, a mobile node sends an uplink packet via a nearby node with lower depth to the management unit; while the management unit transmits a downlink packet to a mobile node by utilizing the source route method. When the parent node of a mobile node is damaged or moves to another position or said mobile node with its sub-tree descendants changes their position together, the uplink routing path is recovered via selecting a nearby node of the sub-tree as relay node and the downlink routing path is recovered via sending a control message to the management unit.