The technologies of sensor

embedded chip

distributed information processing and networks communication are integrated into wireless sensor networks（WSN） which can monitor

perceive and gather real-time various information of the environment collaboratively

and the signals is sent to the host computer for processing.The nodes of WSN serve the functions of perceiving and routing.Power consomption is the key factor affecting the longevit of nodes in practice.A kind of low-power consumption WSN can be designed and realized from network system architecture

sensor nodes

and multi-layered communication protocols.However

some urgent problems remain in this field.