Patent ID: 8467327

Claim:
A method for transmitting and receiving event information between a first node and a second node in a sensor network including a plurality of sensor nodes, the method comprising: dividing a cycle time for event information transmission into a first period and a second period longer than the first period; transmitting or receiving a signal for informing occurrence of an event in the first period; and transmitting or receiving detailed event information in the second period, when the signal is transmitted or received in the first period, wherein: the first node is a sink node, and the second node is an arbitrary node among nodes deployed in a tree type from the first node, the first period comprises at least a first number of signal slots, the first number being equal to a maximum number of hops from the second node to the first node, the second node, nodes on a path from the second node to the first node and the first node operate in the respective signal slots in order from the second node, the second period comprises at least a second number of data slots, the second number being equal to a multiplication of the maximum number of hops from the second node to the first node and a maximum number of data packets which are comprised in the detailed event information, and when the signal is transmitted or received in the first period, the second node, the nodes on the path ranging from the second node to the first node, and the first node repeat operating in the respective data slots in order from the second node by the number of data packets comprised in the detailed event information to transmit or receive the detailed event information.