Method for transmitting sensor data in sensor network including pair node

1. A method for transmitting sensing information in a wireless sensor network including a sink node, parent nodes, and sensor nodes set as pair nodes among sensor nodes connected to the parent nodes, comprising the steps of:

a) setting up predetermined sensor nodes in the same target area as pair nodes for transmitting and receiving sensing information to/from corresponding sensor nodes;

b) at the pair nodes, transmitting first sensing information sensed by oneself to corresponding sensor nodes;

c) at the sensor nodes, transmitting first sensing information sensed by oneself and second sensing information transmitted from corresponding pair nodes to the parent node; and

d) at the parent node, transmitting the received first and second sensing information to the sink node at the same time.

2. The method of claim 1 , further comprising the step of:

e) at the sink node, comparing the first sensing information and the second sensing information, which are transmitted from the pair nodes, and determining that a predetermined sensor node has difficulty if the first sensing information is different from the second sensing information.

3. The method of claim 1 , wherein in the step a), the sensor nodes share information about corresponding pair nodes.

4. The method of claim 1 , wherein in the step b), the sensor nodes transmits first sensing information sensed by oneself to the corresponding pair nodes through the parent node.

5. The method of claim 4 , wherein in the step b), the sensor nodes add a field for indicating a destination of the first sensing information in order to transmit the first sensing information to the corresponding pair node through the parent node.

6. The method of claim 1 , wherein in the step b), the sensor nodes directly transmit the first sensing information to corresponding pair nodes.

7. The method of claim 6 , wherein in the step b), the sensor nodes transmit the first sensing information to corresponding pair nodes through infrared ray based communication.

8. The method of claim 2 , wherein in the step e), the sink node adds the first sensing information and the second sensing information which are transmitted from each of the sensor nodes, and compares the adding results to determine whether a predetermines sensor node has difficulty or not.

9. The method of claim 8 , wherein the adding result is expressed as a value of voltage or current, and the voltage values or the current values is compared.