Patent ID: 8040828
Filing Date: 2011-10-18
Classification: H04L,H04W,Y02D

Abstract:
1. A method for managing dormant nodes in a sensor network, comprising: acquiring and storing information on distance and location of sensor nodes registered in a cluster among at least one cluster managed by a managing node; selecting a dormant object node among the sensor nodes by the managing node; transmitting dormant information that the dormant object node should go into a dormant state for a predetermined period through a beacon message based on the information on the distance and the location from the managing node to the dormant object node and creating a dormant node management table; and updating a dormant time of the dormant node management table every beacon cycle by the managing node according to setup of a dormant time central managing function and notifying dormancy expiration to the corresponding dormant node when the dormant time is expired.