WIRELESS SENSOR NETWORK SYSTEM AND NODE, SENSING MESSAGE PROSESS METHOD

摘要

A wireless sensor network system comprises a sink node device and general node devices. The sink node device transmits a beacon message in a predetermined transmitting section. The sink node device receives sensing messages from the outside in each predetermined receiving section and transmits the sensing messages to the outside. The sink node device reads the sensing data stored in an internal memory unit; generates the sensing messages; and transmits the same to the outside. The sink node device senses the existence of a sensor module in the predetermined sensing section. The sink node device generates the sensing data including a sensing value and stores the same in the internal memory unit. The general node devices perform time synchronization by receiving the beacon message in the predetermined receiving section corresponding to the transmitting section of the sink node device. The general node devices read the sensing data stored in the internal memory unit in the predetermined transmitting section corresponding to one of the receiving sections of the sink node device; generate the sensing message; and transmit the sensing message to the sink node device. The general node devices sense the existence of the sensor module in the predetermined sensing section; generate the sensing data including the sensing value; and store the same in the internal memory unit. The general node devices are in a sleep mode during a section excluding the receiving section, the transmitting section, and the sensing section. When the beacon message is not received, the general node devices are transited to a rib state. The general node devices in the rib state sense the existence of the sensor module in the predetermined sensing section; output emergency warning while broadcasting an emergency warning message to the outside when the sensing value exceeds a predetermined emergency warning limit; and are in the sleep mode during a section excluding the sensing section. [Reference numerals] (100) Gateway;(102) Server;(104) Database;(AA) Server based sensor network system;(N5) Independent sensor network system