| 摘要 |
PURPOSE: A wireless sensor network is provided to minimize the loss of sensing data during the transmission by using a relay node and a relay gateway. CONSTITUTION: When plural sensor nodes(110) are split into the predetermined number of sub groups, a relay node is placed in the upper level in the each split sub-group. If the quantity of the stored data exceeds a predetermined threshold value, the relay node is connected to the corresponding relay gateway among the relay gateways(140,150). Through the connected relay gateway, the relay node(120) transmits the stored data.
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